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Author Topic: R65 : Asymetric camshaft Opinions ?  (Read 121 times)

Offline georgesgiralt

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R65 : Asymetric camshaft Opinions ?
« on: April 07, 2021, 08:02:27 AM »
Hello !
I'm slowly gathering all the parts needed to rebuild my engine.
Alas, Mr BMW in it's wisdom has decided to cease production of camshafts. And I'm late to buy the remaining stock....
But Mr Siebenrock has one said to be "Asymetrical" : https://www.siebenrock.com/en/engine-parts/engine-housing/3592/camshaft-asymmetric
I was wondering about the difference with the "plain" one and if someone has tried it and what are the benefits/drawback ?
I'm all ears !
have a nice day !

Offline Barry

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Re: R65 : Asymetric camshaft Opinions ?
« Reply #1 on: April 07, 2021, 10:41:39 AM »
Unless I missed it Siebenrock doesn't seem to provide the cam timing for comparison with your original 308 cam but they must have the data if you ask.  Asymmetric just means the cam doesn't open and close the valves at the same rate usually closing slower than opening.
Barry Cheshire, England 79 R45

Offline georgesgiralt

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Re: R65 : Asymetric camshaft Opinions ?
« Reply #2 on: April 08, 2021, 06:19:38 AM »
Here is the reply i got from Siebenrock. If this make sense...
Hello Georges,

asymmetric means that the angle from intake and exhaust is not the same. So we can use the maximum of spread.
In sum is it a 320° camshaft. You have about 7-10NM more torque and + ca. 3HP

Mit freundlichen Grüßen / kind regards

Ralf Martin