Supergoose
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| posted on 24/3/12 at 07:37 PM |
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cam chain advise
Building my motor i'm looking for advise again please, I have read that a duplex chain is favourite, although due to the relative low state of
tune is this really necessary? As long as I can dial the cam with a new chain gears and vernier surely that would be enough?
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mookaloid
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| posted on 24/3/12 at 07:41 PM |
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er which engine? is it a high lift cam?
"That thing you're thinking - it wont be that."
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Supergoose
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| posted on 24/3/12 at 07:52 PM |
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sorry, locost xflow with control cam
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mookaloid
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| posted on 24/3/12 at 08:14 PM |
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Ah ok I'm not sure about the x-flow but as a general principle I would say that the duplex chain is for durability - the simplex chain will
stretch and affect the can timing - particularly if driven enthusiastically (and why have a Locost if you aren't going to drive
enthusiastically?)
I would fit the duplex chain and then it can be forgotten about.
"That thing you're thinking - it wont be that."
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Richard Jenkins
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| posted on 25/3/12 at 04:24 PM |
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I'm pretty sure my Randall engine has a simplex chain, part no is TC 1346. It gets replaced at each rebuild.
BTW for 750MC racing you can't use vernier gears, but offset dowels are ok for the camshaft timing
[Edited on 25/3/12 by Richard Jenkins]
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Supergoose
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 posted on 25/3/12 at 06:04 PM |
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Realy i just assumed as i didnt read it the specs.ive not completely researched this off set dowling yet any info would greatfully be received. I have
dialed in dohc race engines before so im hopeful that i can get my head around it
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Richard Jenkins
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| posted on 25/3/12 at 09:03 PM |
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In section 5.7.1 of the regs it says offset dowels are permiited and in 5.7.2 vernier timing is prohibited. But that is as far as my knowledge on this
subject goes, hence why I get Brian Randall to build my engine!!
Found this on the Burton Power website which may help?
http://www.burtonpower.com/tuning-guides/tuning-guide-pages/camshaft-fitting-timing.html
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Supergoose
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| posted on 25/3/12 at 10:50 PM |
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I dont know why but i like to understand as much as race, i've been refreshing re-building bike engines for some time more down to money than
anything my last bike was 400miles between refresh's! The valve timing thing the first time drives you crazy but once you got it its easy
enough. Off set dowls are very new on me and the burton's info you sent(thank you) only just touches on it. for all at Silverstone have a
belter!!
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Supergoose
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| posted on 26/3/12 at 12:11 PM |
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I'm now familia with off set dowels
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