ADVrider

Go Back   ADVrider > Bikes > Old's Cool > Airheads
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

View Results: Which is more reliable for Airheads ... electronic ignition or points?
BMW Airhead electronic ignitions are super reliable. Leave it alone 19 32.76%
BMW Airhead electronic ignitions are junk, replace with aftermarket electronic ignition 3 5.17%
BMW Airhead electronic ignitions are junk, replace with beancan w/points 5 8.62%
BMW points & Condensers are reliable. leave it alone 27 46.55%
BMW points & Condensers are junk. replace with aftermarket electronic ignition 4 6.90%
Voters: 58. You may not vote on this poll

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-28-2012, 05:32 PM   #61
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
The twin sensor can sounds like a good idea IF just sitting there in the heat isn't just as hard on them as working in the heat. A friend put two in his and runs them both at the same time (no wasted spark).

The beans can's biggest problem is the mechanical advance? I have worked and been around tons of bean can airheads since they first came out and I almost never see any mechanical advance problems. The problem I see them having is a failed sensor but that is the same sensor in what everybody else is selling so I hear about tons of mechanical advance issues since they have electronic advance. The trouble is I don't see much trouble at all with the mechanical advance. IMO, the easiest probelm to fix is one you made up to start with. How is a electronic advance going to improve starting over a mechanical one? If your bike is set up right, how would you get easier starting? Mine starts the second I hit the starter with a mechanical advance. Sorry but I just don't get it.

If I was running around the world, I would get a can that has a easily replaceable sensor and carry a spare. The biggest trouble will be remembering where you put it 20 years later when you need it.
supershaft is offline   Reply With Quote
Old 10-29-2012, 01:40 AM   #62
Bulldust
Bulldust
 
Bulldust's Avatar
 
Joined: Jun 2007
Location: Australia
Oddometer: 808
Quote:
Originally Posted by supershaft View Post
The twin sensor can sounds like a good idea IF just sitting there in the heat isn't just as hard on them as working in the heat. A friend put two in his and runs them both at the same time (no wasted spark).

The beans can's biggest problem is the mechanical advance? I have worked and been around tons of bean can airheads since they first came out and I almost never see any mechanical advance problems. The problem I see them having is a failed sensor but that is the same sensor in what everybody else is selling so I hear about tons of mechanical advance issues since they have electronic advance. The trouble is I don't see much trouble at all with the mechanical advance. IMO, the easiest probelm to fix is one you made up to start with. How is a electronic advance going to improve starting over a mechanical one? If your bike is set up right, how would you get easier starting? Mine starts the second I hit the starter with a mechanical advance. Sorry but I just don't get it.

If I was running around the world, I would get a can that has a easily replaceable sensor and carry a spare. The biggest trouble will be remembering where you put it 20 years later when you need it.
I don't understand how running two Hall Effect sensors at the same time would result in no wasted spark? It would certainly result in a distorted signal, no matter how accuratly they are mounted it is impossible to get the signals precisely at 180 degrees to each other.

I see lots of mechanical advance problems, particularly on high mileage bikes the wear is a real problem, the bike still runs and starts but in comparsion to a modern electronic advance the power loss is very significant.

"I hear about tons of mechanical advance issues since they have electronic advance". Not sure about this one?

Advantages of a modern electronic advance over mechanical advance, everone who has tried my system has commented on the many advantages, I guess you would have to try them with an open mind to find out. If mechanical advance was so good why have all manufactures abandoned the system?
Bulldust is offline   Reply With Quote
Old 10-29-2012, 02:54 AM   #63
chasbmw
Beastly Adventurer
 
Joined: Feb 2006
Location: Bath Uk
Oddometer: 1,880
If you really need redundancy, then use either the Sachse or the Silent Hektik alternator mounted ignition and retain whatever ignition you have in the beancan position. Both these ignitions are reliable (I use both on different bikes) have a variety of ignition maps, some of which are suitable for twin plug use, and being mounted on the crank will not be affected by any timing chain wear anomalies.

Changing over the ignition from one to the other can be done in minutes, I suppose you could make it switchable, but then sods law would result in having problems with the switch.

Both systems mount the advance retard electronics Outside the engine so they won't be subject to too many heat cycles, which I think was the problem with the Omega ignition sold a couple of years ago. Volker Sachse also sell a variety of ignitions for laverdas, Ducatis and moto guzzis, his operation has a low BMW profile, I came across him via an aussi Laverda site!
__________________
Charles
http://i46.photobucket.com/albums/f1...ps6e61ae2e.jpg
R90s 1070 replica, R90/6
1971 Commando Fastback
chasbmw is offline   Reply With Quote
Old 10-29-2012, 03:13 AM   #64
_cy_ OP
Beastly Adventurer
 
Joined: Sep 2011
Location: Tulsa, Oklahoma
Oddometer: 5,604
Quote:
Originally Posted by Bulldust View Post
I don't understand how running two Hall Effect sensors at the same time would result in no wasted spark? It would certainly result in a distorted signal, no matter how accuratly they are mounted it is impossible to get the signals precisely at 180 degrees to each other.

I see lots of mechanical advance problems, particularly on high mileage bikes the wear is a real problem, the bike still runs and starts but in comparsion to a modern electronic advance the power loss is very significant.

"I hear about tons of mechanical advance issues since they have electronic advance". Not sure about this one?

Advantages of a modern electronic advance over mechanical advance, everone who has tried my system has commented on the many advantages, I guess you would have to try them with an open mind to find out. If mechanical advance was so good why have all manufactures abandoned the system?
good point about difficulty of aligning up two sensor to trigger at exactly 180degrees. wiring two halls triggers together would defeat purpose of carrying spare halls inside beancan.

does carrying your spare hall sensor inside beancan age at same rate as working hall trigger? spare installed Hall sensor goes through exact same number of cycles as working sensor. logic says odds of both sensor failing at same time would be remote.

reason why mfg have switched from mechanical advance is to is lower costs and help pass EPA regulations. not due to mechanical advance failures. if mechanical advance failures was truly an issue, we'd be seeing it all the time on ADV and else where.

running an aftermarket beancan with easily replaceable Hall sensor typically costs about $400. surely there's a way to modify OEM beancan to make changing out hall sensor field serviceable.

seems there was someone that had multiple beancan failure due to magnets coming loose in Siberia. points beancan is starting to look better and better again. simple is good!

_cy_ screwed with this post 10-29-2012 at 08:39 AM
_cy_ is offline   Reply With Quote
Old 10-29-2012, 03:22 PM   #65
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
Quote:
Originally Posted by Bulldust View Post
I don't understand how running two Hall Effect sensors at the same time would result in no wasted spark? It would certainly result in a distorted signal, no matter how accuratly they are mounted it is impossible to get the signals precisely at 180 degrees to each other.

I see lots of mechanical advance problems, particularly on high mileage bikes the wear is a real problem, the bike still runs and starts but in comparsion to a modern electronic advance the power loss is very significant.

"I hear about tons of mechanical advance issues since they have electronic advance". Not sure about this one?

Advantages of a modern electronic advance over mechanical advance, everone who has tried my system has commented on the many advantages, I guess you would have to try them with an open mind to find out. If mechanical advance was so good why have all manufactures abandoned the system?
Each sensor goes to one coil. No wasted spark. That's how you run a 360 or 180 degree crank with no wasted spark. Or you can have the same setup for dual plugging like some I know have done.

Electronic is better and cheaper but that doesn't change the fact that I almost never see mechanical advance issues despite everyone and their mother on the net suggesting others might have them. Open mind? If I didn't have that I would have jumped on the sticking advance bandwagon decades ago but guess what? I don't see it. It's great when what I hear is what I see but . . . . And then there are the ignition curves available. With one exception so far, they don't empress me. I just dual plugged my bean can bike. It took about five minutes to readjust the curve from 6 to 28 degrees versus 32. I might delay full advance rpm in the future and that will take a bit more time but I can get the curve exactly where I want it. Not so with most electronic advances I have seen.

I still don't know how advance comes into play at starter motor RPM?
supershaft is offline   Reply With Quote
Old 10-30-2012, 12:12 AM   #66
Bulldust
Bulldust
 
Bulldust's Avatar
 
Joined: Jun 2007
Location: Australia
Oddometer: 808
Quote:
Originally Posted by supershaft View Post
Each sensor goes to one coil. No wasted spark. That's how you run a 360 or 180 degree crank with no wasted spark. Or you can have the same setup for dual plugging like some I know have done.

Electronic is better and cheaper but that doesn't change the fact that I almost never see mechanical advance issues despite everyone and their mother on the net suggesting others might have them. Open mind? If I didn't have that I would have jumped on the sticking advance bandwagon decades ago but guess what? I don't see it. It's great when what I hear is what I see but . . . . And then there are the ignition curves available. With one exception so far, they don't empress me. I just dual plugged my bean can bike. It took about five minutes to readjust the curve from 6 to 28 degrees versus 32. I might delay full advance rpm in the future and that will take a bit more time but I can get the curve exactly where I want it. Not so with most electronic advances I have seen.

I still don't know how advance comes into play at starter motor RPM?
When mechanical advance is stuck at full advance (as they often do) it makes the bike harder to start. I have had sticking advance weights in nearly all of my airheads, perhaps we just use them harder over here in Australia? I often see rusted internal parts inside original BMW beancans.

As the hall effect sensors in the cam driven bean can are triggered every 180 degrees of crank rotation using two active sensors at 180 degrees apart in the bean can would trigger a pulse at every 90 degrees of crank rotation (as the cam/bean can is rotated 2:1 to the crank) seems to me that you would still have a wasted spark on each cylinder, and use twice as many sensors to do it. Also getting the two sensors mounted precicely 180 degrees apart is difficult unless you use an adjustable mount on one sensor.
Bulldust is offline   Reply With Quote
Old 10-30-2012, 07:56 AM   #67
Airhead Wrangler
Adios Mexico
 
Airhead Wrangler's Avatar
 
Joined: Mar 2008
Location: Back in Seattle, FINALLY
Oddometer: 6,387
Quote:
Originally Posted by Bulldust View Post
As the hall effect sensors in the cam driven bean can are triggered every 180 360 degrees of crank rotation using two active sensors at 180 degrees apart in the bean can would trigger a pulse at every 90 360 degrees of crank rotation (as the cam/bean can is rotated 2:1 1:2 to the crank) seems to me that you would still have a wasted spark on each cylinder, and use twice as many sensors to do it. Also getting the two sensors mounted precicely 180 degrees apart is difficult unless you use an adjustable mount on one sensor.
Corrected.

Your conclusion is right though. In order to trigger each cylinder once every 720 degrees of crank rotation, you'd need to make a rotor with only one trigger point on it instead of two which the stock one has. You'd also need one sensor to have a bit of adjustment to get it just right. As big as a PITA as that sounds, ducatis are like that.
__________________
R80ST Gets The HPN Treatment
Seattle to TDF on an airhead

Current rides: HPN #834, '93 R100GSPD "red rocket", '73 R75/5 Toaster mongrel, '80 Ducati Pantah 500SL, '92 DR350, '67 Honda SS50, '80 Honda Chaly.

Airhead Wrangler screwed with this post 10-30-2012 at 08:15 AM
Airhead Wrangler is offline   Reply With Quote
Old 10-30-2012, 01:32 PM   #68
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
Quote:
Originally Posted by Airhead Wrangler View Post
Corrected.

Your conclusion is right though. In order to trigger each cylinder once every 720 degrees of crank rotation, you'd need to make a rotor with only one trigger point on it instead of two which the stock one has. You'd also need one sensor to have a bit of adjustment to get it just right. As big as a PITA as that sounds, ducatis are like that.

That's what I meant to say. I was getting my wasted spark setups and my dual spark setups mixed up in my head.

Advances stuck on full advance? I work on quite a few bean can setups and I have never seen it. I have never had any problem with my 200,000 miles of personal bean can advance experience. I could find a nonop electronic advance and fix it with a mechanical one and claim they start better than electronic but what good does that do?
supershaft is offline   Reply With Quote
Old 12-01-2012, 12:02 PM   #69
_cy_ OP
Beastly Adventurer
 
Joined: Sep 2011
Location: Tulsa, Oklahoma
Oddometer: 5,604
worth repeating...

electronic ignition failures in all but airheads are just about non-existent. yes all electronic can and do fail, but are very reliable.

would we be having this discussion in say Honda or Yamaha bikes? yes ignition failures do exist, but for everything except for airheads they are rare indeed.

someone will be along shortly to deny it all. but for some reason threads on electronic ignition failures for airheads both OEM and aftermarket ignitions consistently pop up.

right or wrong, my take is due to location of halls sensor on airheads. Halls can fail early due to exposure to extremes in heat cycles.

mechanical advances are very reliable, but do need maintenance. sure you can tear it down, but a shot of spray lube usually does it. little to no advantage with electronic advances. unless one is racing and need ability to change advance curves.

your mileage may veri... but after much hashing... candidates for best solution are:

1. stick with points with addition of ignition booster which reduces maintenance close to full electronics. carry spare point/cond, remove booster in case of failure.

2. switch to electronic ignition with ability to field service halls sensor. beancans with two halls are still suspect because spare halls will be subjected to same heat cycles. carry spare halls in case of failure.

due to high failure rates, 2x Bosch 12v coils should be changed out to a high performance Dynacoil. some OEM electronics last for 150k+ miles without issues. some are not so lucky... perhaps it's just time after faithfully working for 30+ years...

_cy_ screwed with this post 12-01-2012 at 02:54 PM
_cy_ is offline   Reply With Quote
Old 12-02-2012, 07:14 PM   #70
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
Where is that you are getting your info. Electronic ignitions fail on all makes. Hall effect sensors are in hot spots in most motorcycle engines, not just airheads. I have been a car mechanic and worked at multi-line motorcycle dealerships. Other bikes DO have electronic ignition failures. Honda's or Yamaha's? Most of them are totaled long before most airheads. Go figure. And yes, electronic ignitions are still much more reliable than points.

Brass floats aren't the answer either!
supershaft is offline   Reply With Quote
Old 12-02-2012, 08:20 PM   #71
_cy_ OP
Beastly Adventurer
 
Joined: Sep 2011
Location: Tulsa, Oklahoma
Oddometer: 5,604
Quote:
Originally Posted by supershaft View Post
Where is that you are getting your info. Electronic ignitions fail on all makes. Hall effect sensors are in hot spots in most motorcycle engines, not just airheads. I have been a car mechanic and worked at multi-line motorcycle dealerships. Other bikes DO have electronic ignition failures. Honda's or Yamaha's? Most of them are totaled long before most airheads. Go figure. And yes, electronic ignitions are still much more reliable than points.

Brass floats aren't the answer either!
yada.. yada ... yada... never said halls don't fail on other bikes and cars ... just that for what ever reason, they seem to fail more on airheads.

if someone would offer a nice set of brass floats for bing carbs... I'd be all over em. and yes brass floats can fail too. but not like plastic floats. which can be counted on to give problems. vs brass floats rarely fail. then they can be repaired.

in your dreams ... airhead electronic ignitions are more reliable than points... now if you had said less maintenance, I'd go for that until... you are pushing your airhead with a failed halls
_cy_ is offline   Reply With Quote
Old 12-02-2012, 09:04 PM   #72
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
Quote:
Originally Posted by _cy_ View Post
yada.. yada ... yada... never said halls don't fail on other bikes and cars ... just that for what ever reason, they seem to fail more on airheads.

if someone would offer a nice set of brass floats for bing carbs... I'd be all over em. and yes brass floats can fail too. but not like plastic floats. which can be counted on to give problems. vs brass floats rarely fail. then they can be repaired.

in your dreams ... airhead electronic ignitions are more reliable than points... now if you had said less maintenance, I'd go for that until... you are pushing your airhead with a failed halls
Just that for whatever reason? That's my point. Whatever reason you make up. Apparently from what you have gleamed from reading the idiotnet?
supershaft is offline   Reply With Quote
Old 12-02-2012, 09:11 PM   #73
_cy_ OP
Beastly Adventurer
 
Joined: Sep 2011
Location: Tulsa, Oklahoma
Oddometer: 5,604
Quote:
Originally Posted by supershaft View Post
Just that for whatever reason? That's my point. Whatever reason you make up. Apparently from what you have gleamed from reading the idiotnet?
yada .. yada .. yada ... ya what ever

we'll see who's pushing their airhead first from ignition failure... your dead halls or my dead points....
_cy_ is offline   Reply With Quote
Old 12-02-2012, 09:26 PM   #74
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
Quote:
Originally Posted by _cy_ View Post
yada.. yada ... yada... never said halls don't fail on other bikes and cars ... just that for what ever reason, they seem to fail more on airheads.

if someone would offer a nice set of brass floats for bing carbs... I'd be all over em. and yes brass floats can fail too. but not like plastic floats. which can be counted on to give problems. vs brass floats rarely fail. then they can be repaired.

in your dreams ... airhead electronic ignitions are more reliable than points... now if you had said less maintenance, I'd go for that until... you are pushing your airhead with a failed halls
Just that for whatever reason? That's my point. Whatever reason you make up. Apparently from what you have gleamed from reading the idiotnet?
supershaft is offline   Reply With Quote
Old 12-02-2012, 10:30 PM   #75
_cy_ OP
Beastly Adventurer
 
Joined: Sep 2011
Location: Tulsa, Oklahoma
Oddometer: 5,604
Quote:
Originally Posted by supershaft View Post
Just that for whatever reason? That's my point. Whatever reason you make up. Apparently from what you have gleamed from reading the idiotnet?
yada .. yada .. yada ... ya what ever

we'll see who's pushing their airhead first from ignition failure... your dead halls or my dead points....
_cy_ is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 10:23 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014