New 336° cam from BMW

[supershaft]

Originally Posted by Rob Farmer

So now you know the problem is just as richie said it was what's the way forward with it? BMW will obviously keep selling these cams until they're all sold which means there's going to be a lot if air headers that are going to get there fingers burnt. I would imagine that any cams returned will simply be sold onto the next unsuspecting customer. The obvious thing to me is to find some way of letting them know that it's common knowledge that they're selling duff cams.

I don't think BMW resells there warrantied parts. Half the time they never request them back. I think BMW has sat on and absorbed many a bad run of parts once they figure out what is going on which may be never but not always.

[mendoje]

Can anyone comment on this batch of 336 cams, on sale right now at Max BMW:

http://www.maxbmwmotorcycles.com/fic...3&rnd=08102012

from the parts fiche, "30.00% OFF-Getting rid of inventory!"

[supershaft]

Originally Posted by mendoje

Can anyone comment on this batch of 336 cams, on sale right now at Max BMW:

http://www.maxbmwmotorcycles.com/fic...3&rnd=08102012

from the parts fiche, "30.00% OFF-Getting rid of inventory!"

On sale or not, BMW parts are warrantied for a year in this country.

[mattcfish]

Originally Posted by mendoje

Can anyone comment on this batch of 336 cams, on sale right now at Max BMW:

http://www.maxbmwmotorcycles.com/fic...3&rnd=08102012

from the parts fiche, "30.00% OFF-Getting rid of inventory!"

$119.00 is an amazing price. Buy one and return it if it doesn't measure up. If it does, let us know.
I'll buy 2!

[mendoje]

I have a lathe, all the right measuring tools and instruments, and I'm ready to plunk down my card to buy one. Referring to this sketch, at the peak of each lobe, we're looking for taper from back to front across the face, right?

[jbcaddy]

Originally Posted by mattcfish

$119.00 is an amazing price. Buy one and return it if it doesn't measure up. If it does, let us know.
I'll buy 2!

That price was making me think yes, but they do not have any for /5. out of stock for years

[supershaft]

Originally Posted by mattcfish

$119.00 is an amazing price. Buy one and return it if it doesn't measure up. If it does, let us know.
I'll buy 2!

Better yet, ask the parts guy to get out his plastic parts guy caliper and measure it for you. There are at least two tapered lobes there to compare the tapered lobes and the flat lobes if they have any.

[supershaft]

Originally Posted by mendoje

I have a lathe, all the right measuring tools and instruments, and I'm ready to plunk down my card to buy one. Referring to this sketch, at the peak of each lobe, we're looking for taper from back to front across the face, right?

Yes.

[supershaft]

Originally Posted by mattcfish

$119.00 is an amazing price. Buy one and return it if it doesn't measure up. If it does, let us know.
I'll buy 2!

What's retail now? That can't be much over dealer? When they are ground right they are awesome cams as you now know too! They do it all. Especially upper midrange! Right where I ride all the time. Man I am loving my new setup with my old 70k miles on it now 336!

[Voltaire]

I bought a bean can 336 about 4 years ago, but ended up using a pre bean motor so had the local cam expert convert a 308 to 336, which included making a set of 'masters'
More recently got him to convert a R65 cam to 336 as well for a 500 race motor project.....and yes the phasing was taken into account....
You can see where material has been added.
Out of curiosity I put the vernier across the lobes and yes there is a taper.
The 336 in the R90 runs ok but I have not been able to get a good idle, not really an issue in a race bike, pulls really well up to the rev limiters cut out 7500. I used to use the tach but they read about 500 rpm high from memory, with the Ignitech you can read the RPM off the laptop during set up.

[supershaft]

Originally Posted by Voltaire

I bought a bean can 336 about 4 years ago, but ended up using a pre bean motor so had the local cam expert convert a 308 to 336, which included making a set of 'masters'
More recently got him to convert a R65 cam to 336 as well for a 500 race motor project.....and yes the phasing was taken into account....
You can see where material has been added.
Out of curiosity I put the vernier across the lobes and yes there is a taper.
The 336 in the R90 runs ok but I have not been able to get a good idle, not really an issue in a race bike, pulls really well up to the rev limiters cut out 7500. I used to use the tach but they read about 500 rpm high from memory, with the Ignitech you can read the RPM off the laptop during set up.

Did you have your 336's ground straight up or advanced 3*? I have no experience getting 336's timed straight up to idle. Advanced 3* I have gotten good idles out of three that I have set up and I have seen good idles out of other 336's as well. I would start with making sure your valves aren't leaking AT ALL. I sure would be sure and time copied grinds to in order to make sure what you got!

Why set your rev limiter so low? Piston speed is super safe until you are real close to 9000rpm. If your valves aren't floating and they shouldn't be with titanium spring retainers, rev it higher for more power. If it isn't making more power up there you still might be able to use the over rev to your advantage at some tracks. 336's have good usable over rev.

[Voltaire]

Originally Posted by supershaft

Did you have your 336's ground straight up or advanced 3*? I have no experience getting 336's timed straight up to idle. Advanced 3* I have gotten good idles out of three that I have set up and I have seen good idles out of other 336's as well. I would start with making sure your valves aren't leaking AT ALL. I sure would be sure and time copied grinds to in order to make sure what you got!

Why set your rev limiter so low? Piston speed is super safe until you are real close to 9000rpm. If your valves aren't floating and they shouldn't be with titanium spring retainers, rev it higher for more power. If it isn't making more power up there you still might be able to use the over rev to your advantage at some tracks. 336's have good usable over rev.

Good points,I'm not sure on the advance, have to check with my Guru on that.... I have bugger all experience outside stock setup.
The motor was put together on a real low budget just to see if riding on the track was for me, the valve train is stock at this stage. Been looking at SS Manley valves ( lighter), titanium retainers and beehive springs.Another 1000 rpm would sure be useful, would be able to stay in front of the featherbed Dominator 850 after passing him on the corner under brakes....
Had a good season with the old girl, surprised quite a few, expecially the Harleys.

[DanMay]

Originally Posted by Voltaire

More recently got him to convert a R65 cam to 336 as well for a 500 race motor project.....and yes the phasing was taken into account....

How did the 336 work out in your 500cc race motor ? I am interested in your experience, and curious if the smaller displacement and valve size will benefit from the 336 profile. I am currently racing a R50/5 with the stock camshaft.

Daniel

[Voltaire]

Originally Posted by DanMay

How did the 336 work out in your 500cc race motor ? I am interested in your experience, and curious if the smaller displacement and valve size will benefit from the 336 profile. I am currently racing a R50/5 with the stock camshaft.

Daniel

Its still on the bench at the moment, the rules here allow you to run parts that " look the same"....
So its really going to be an R45 motor with R65 heads, 336 cam and a light valve train.
I have not heard of anyone doing this....probably good reason.
Cylinder wall needs a smidgen taken out but shrouding could be an issue....as might the 36mm inlet ports.....its suck it and see territory.
For a r50/5 the 308 cam would probably work better .....once again pure supposition.

[AntonLargiader]

Originally Posted by Voltaire

.. the rules here allow you to run parts that " look the same".....

To me, a 1070 kit with Mikunis would look [sort of] the same as an R50. Close enough!