ADVrider

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

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-17-2012, 05:49 AM   #61
adventure950
Anglo-Saxon
 
Joined: Sep 2005
Location: Northumberland UK
Oddometer: 517
Mr Gregor I think you have it spot on with what MK66 says - (I read his stuff on the other forum) The 296 feels very torquey, smooth power delivery and so on and i think your right some other set ups will give more torque - but its not a bad starting point and its certainly a very rideable engine configuration - with this cam in. Cheers Jake.
__________________
'A tourist sees what he went to see,
a traveller sees what he sees'
adventure950 is offline   Reply With Quote
Old 07-17-2012, 06:23 AM   #62
RGregor
User Awaiting Email Confirmation
 
Joined: Oct 2007
Location: Bavaria
Oddometer: 437
Quote:
Originally Posted by adventure950 View Post
Mr Gregor I think you have it spot on with what MK66 says - (I read his stuff on the other forum) The 296 feels very torquey, smooth power delivery and so on and i think your right some other set ups will give more torque - but its not a bad starting point and its certainly a very rideable engine configuration - with this cam in. Cheers Jake.
Hi Jake,

I just reported what others have experienced. No personal experience with that cam.

Best regards, Rudi
RGregor is offline   Reply With Quote
Old 07-17-2012, 06:24 AM   #63
RGregor
User Awaiting Email Confirmation
 
Joined: Oct 2007
Location: Bavaria
Oddometer: 437
Quote:
Originally Posted by supershaft View Post
Too bad the numbers mean almost nothing unless you got your numbers form the same dyno I did with the same operator when he was in the same mood.
Two additional questions: what configuration do you have regarding exhaust (header pipes and mufflers) and air box?
RGregor is offline   Reply With Quote
Old 07-17-2012, 11:21 AM   #64
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
Quote:
Originally Posted by RGregor View Post
Two additional questions: what configuration do you have regarding exhaust (header pipes and mufflers) and air box?
Fed up and annoyed? We have finally come real close to the same conclusion. Let's leave it at that. The rest of us are discussing cams.
supershaft is online now   Reply With Quote
Old 07-17-2012, 11:35 AM   #65
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
If this thread and the other current cam thread could ever have anything close to a conclusion I guess it would be that we are left to researching individual opinions about cams that hopefully they have actually run and compared. It's a real shame that many of the cams for our airheads do not have specs with check points so we could compare specs. Pretty much everyone realizes that comparing specs is as much art as science but perhaps not as much as comparing a bunch of he said/she said. Since the he said/she said is all we have, I hope the stories about other cams are a lot closer to the truth than that what I have found to be true about the 336 compared to most the stories about them out there. Going simply by reported performance, my 336 experience tells me to buy the cam with the worst reputation. There's a small crowd here that is real happy doing just that!

supershaft screwed with this post 07-17-2012 at 11:42 AM
supershaft is online now   Reply With Quote
Old 07-24-2012, 12:53 AM   #66
adventure950
Anglo-Saxon
 
Joined: Sep 2005
Location: Northumberland UK
Oddometer: 517
Means very little to me but maybe you tech guys can use this cam timing readout graph
__________________
'A tourist sees what he went to see,
a traveller sees what he sees'
adventure950 is offline   Reply With Quote
Old 07-24-2012, 01:08 AM   #67
Padmei
enamoured
 
Joined: Mar 2008
Location: Nelson New Zealand
Oddometer: 3,454
The dark blue is more natural. The red is a bit OTT if you ask me, a bit too much pornstar but if you feel you really do need enhancement just go with the lite blue.

Can we see side view too please?
Padmei is offline   Reply With Quote
Old 07-24-2012, 01:14 AM   #68
adventure950
Anglo-Saxon
 
Joined: Sep 2005
Location: Northumberland UK
Oddometer: 517
Padmei - you really need to be getting out you know .
__________________
'A tourist sees what he went to see,
a traveller sees what he sees'
adventure950 is offline   Reply With Quote
Old 07-24-2012, 03:25 AM   #69
Beemerboff
Beastly Adventurer
 
Joined: May 2005
Oddometer: 2,267
Nice curves, but just one point, can anyone see a lift point where all the durations match the claimed figures.

And if they can, shouldnt that give us the checking clearance?
__________________
Adelaide Hills, Australia. 93 R100 GS, 77 R75/7 ,70 BSA B44VS, , 86 R80 G/S PD, 95 BMW Funduro F650 ST
Beemerboff is offline   Reply With Quote
Old 07-24-2012, 10:39 AM   #70
supershaft
because I can
 
Joined: Sep 2010
Location: San Francisco Bay area
Oddometer: 8,400
The degree graph isn't near big enough to tell anything I don't think. You have six OR seven dashes representing 30 degrees. Ballpark figures again?
supershaft is online now   Reply With Quote
Old 09-19-2013, 01:58 AM   #71
Ras Thurlo
Desert Lion
 
Ras Thurlo's Avatar
 
Joined: Aug 2010
Location: Hillcountry, Italy
Oddometer: 588
bump


Quote:
Originally Posted by adventure950 View Post
I would say its really smooth at lower revs there is virtually no shake and shudder above 2000 revs but its still an airhead so there is some feel to the motor but not like it used to be.( in fact i am able to slow the engine in top gear on level ground to little over 1600 revs ride along quite smooth and gently pull away without any major protest from the engine) Before doing the mods the bike would protest below 3000revs and would bog down easily in higher gears at low speed, But now my bike is really easy to ride low down and i have got into a bad habit of sitting in top gear at 2000 revs - pootling along in traffic then just opening the throttle and off she goes nothing no rattle, protest - shake or feeling of bogging down.
I also like to ride my airheads at the bottom end of the power band, keeping the bike at +/- 2k revs and rarely venturing beyond 5.5k. I have so far been looking at this topic through the view of shorter gear ratios rather than cam change.

Quote:
Originally Posted by AliBaba View Post
Then you better install one on a standard R80

I've tried several R80 with just the Siebenrock kit and that's why I decided that a standard Siebenrock kit was not what I was looking for. My estimate is that this setub beats the standard Siebenrock up to 5700 RPM.
has anyone out there done a 296 cam change and left everything else stock? All thread commentary have been on bikes with 1000cc conversions and flowed heads, which means its hard to validate this estimate
Ras Thurlo is offline   Reply With Quote
Old 09-19-2013, 11:55 AM   #72
Prutser
Studly Adventurer
 
Prutser's Avatar
 
Joined: Aug 2012
Location: The Dutch swamp
Oddometer: 921
I had one in an R100R. The rest of the bike was stock. Compared to a stock 91' R100 mono it could climb steep hills at idle. when you had to raise the rpm a little with the stock R100 mono to do the same thing. That was impressive sometimes. For the rest it was a bad choice for my preference. The usable rev range was way to short(again the short power band).
In the higher rev ranges there is nobody home with that cam when the rest of the engine is stock.
It can be improved with spending more money.

For me personally not the best cam because I love the long power-band.
__________________
BMW R100'91/R80'93/R75/6 R80ST'83/R65GS'87/GasGasTXT300/DouglasW20-1920

R100GS'91 (sold)
Prutser is offline   Reply With Quote
Old 10-07-2013, 12:46 AM   #73
Ras Thurlo
Desert Lion
 
Ras Thurlo's Avatar
 
Joined: Aug 2010
Location: Hillcountry, Italy
Oddometer: 588
Quote:
Originally Posted by Prutser View Post
I had one in an R100R. The rest of the bike was stock. Compared to a stock 91' R100 mono it could climb steep hills at idle. when you had to raise the rpm a little with the stock R100 mono to do the same thing. That was impressive sometimes. For the rest it was a bad choice for my preference. The usable rev range was way to short(again the short power band).
In the higher rev ranges there is nobody home with that cam when the rest of the engine is stock.
It can be improved with spending more money.
.
So is the answer to use the 296 cam only in conjunction with a more hot-rod engine?

Prutsers comment was with a cam-only change at high revs there is no-one home, while all the other post (inc piston upgrades etc) seem to suggest great pulling power until approx 6k revs and then a gradual tail-off rather than a cliff-fall.

Quote:
Originally Posted by adventure950 View Post
But the torque curve has no peaks or troughs its almost flat from 2400 revs through to 6000revs. The torque is the feature that this engine set up is all about.
Ras Thurlo is offline   Reply With Quote
Old 10-07-2013, 08:34 AM   #74
RGregor
User Awaiting Email Confirmation
 
Joined: Oct 2007
Location: Bavaria
Oddometer: 437
Quote:
Originally Posted by Ras Thurlo View Post
So is the answer to use the 296 cam only in conjunction with a more hot-rod engine?
Hello,

unless you like pinging you should not run this cam in combination with high compression.

Best regards,

RG
RGregor is offline   Reply With Quote
Old 10-07-2013, 10:17 AM   #75
DiabloADV
Semi-Occasional
 
Joined: Oct 2010
Location: Nor Cal, USA
Oddometer: 2,175
Quote:
Originally Posted by RGregor View Post
Hello,

unless you like pinging you should not run this cam in combination with high compression.

Best regards,

RG
What about with stock compression? I've got a Seibenrock 1000 kit that will go on my R90 motor, but I plan to use a thicker shim to keep compression a little lower. I don't want to dual-plug the thing.

I don't like riding at high revs, so I was thinking this cam might be interesting...
__________________
1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5

'91 Bill Holland Steel w/Dura Ace[/SIZE]
'01 Z3 3.0 Coupe. The Clownshoe.
DiabloADV 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 06:54 PM.


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