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<  Performance issues  ~  cam shaft and nos trw 811 pistons

t1m32sh1n3
Posted: Tue Aug 12, 2008 9:01 pm Reply with quote
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Joined: 01 May 2008 Posts: 18 Location: central ohio
i was wondering if anyone knows how big of a cam i can run with these pistons? is there anyway to find out? with out bolting the motor together with plastiguage on the piston crowns. thanks chris
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Satanic Mechanic
Posted: Wed Aug 13, 2008 8:24 am Reply with quote
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Joined: 04 Sep 2005 Posts: 309 Location: Munich, Germany
t1m32sh1n3 wrote:
is there anyway to find out? with out bolting the motor together with plastiguage on the piston crowns. thanks chris
Not really. The real check is just bolting it together with plastilene (Plastigauge is for bearing clearances only, here we are talking about 1mm or more).

If you would have a picture of your pistons, I could make a guess looking at the valve pockets.

Cheers,
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t1m32sh1n3
Posted: Sat Aug 16, 2008 3:46 am Reply with quote
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t1m32sh1n3
Posted: Sat Aug 16, 2008 3:55 am Reply with quote
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t1m32sh1n3
Posted: Sat Aug 16, 2008 3:56 am Reply with quote
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t1m32sh1n3
Posted: Sat Aug 16, 2008 3:57 am Reply with quote
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t1m32sh1n3
Posted: Sat Aug 16, 2008 4:11 am Reply with quote
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Joined: 01 May 2008 Posts: 18 Location: central ohio
trw L2424, 3mm, 10.5:1 comp. ratio. im looking for a cam that will make up for the extra displacement. shes a everyday rider and i put alot of miles on her and i ride hard so i definately dont want to lose reliability. but id like a hot cam so i can really feel the difference. i race stop light to stop light alot and i also ride the freeway alot. id like more mid range and top end but i dont want to sacrifice bottom end. the motor is a 71 and im sticking with the stock carbs. everything else in the motor will be stock except pistons and cam. sprockets are 18/48. 4-2 exhaust(1-3,2-4), no baffles.

also what valve springs with the recommended cam?

thanks chris
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Satanic Mechanic
Posted: Sun Aug 17, 2008 7:26 pm Reply with quote
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Joined: 04 Sep 2005 Posts: 309 Location: Munich, Germany
Hi Cris,

from what I see on the pics (BTW, I edited your postings a bit to make the images show up directly), and how you describe your riding style, I would recommend either Megacycle's 125-65 or Web Cam's 41a. The Megacycle is only available as hardweld in exchange for a stock cam, the web cam is still available as billet. I would guess both cams are ok with your valve pockets, but I would recommend checking clearance when you assemble the engine - its better to be safe than sorry Wink .

For valve springs, I would go for stock F2 ('7Cool springs, they are about 10% stiffer, and probably titanium retainers. I run that combo with a 125-65, and it revs up to 10k and more with no problem which should give you more than enough safety.

Cheers,
Axl
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t1m32sh1n3
Posted: Mon Aug 18, 2008 8:13 pm Reply with quote
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i appreciate the input. ill check the specs on that cam and go from there
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t1m32sh1n3
Posted: Tue Aug 19, 2008 8:44 pm Reply with quote
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where can i get the valve springs?
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Satanic Mechanic
Posted: Fri Aug 22, 2008 4:28 pm Reply with quote
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Couple of options: Used springs from your nearby wrecker's yard (look for a black 750 engine), your local Honda dealer, or David Silver Spares in the UK or CMS in the Netherlands.
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