Pistons

[Marc Fenner]

Are we aloud to doing anything to the pistons???

[Derek Coghill]

Best to do it quietly......

I think "no" is the answer you're looking for...there's a bit somewhere in the regs which states that it is forbidden to mill/machine/grind/polish anything not expressly permitted.

[philip myatt]

Derek's got the general idea, however, I would suggest that you read the rules, you may be surprised at the things that are covered that you'd assumed there would be no problem tweaking.

[Steve Panas]

 ;D 8)
If it says you can you can. If it don't say you can you cannot.
Steve

[Marc Fenner]

Hmm ok well does anyone no where i cn get a copy of the regs??? :-\

[Derek Coghill]

Yes....here.

http://www.2cvracing.org.uk/technical/25-gettingstarted

[Trevor Williams]

And you have entered a car in the 24 hour race how many times?????????  :o

[Marc Fenner]

I have the rules somewhere but not with me at uni! Have lots of new ideas though i want to try and dont know if i can for racing. Also looking into developing a new cam shaft for racing as my second year project. ;D

[Derek Coghill]

<developing a new cam shaft for racing>

Why?

[Marc Fenner]

Because i actually feel that there could be better. I think now after long chats etc with people who build and design engine that the cam has the wrong profile. I believe this is part of the reason that we are pulling valve heads off.

[Derek Coghill]

Would you not be better off designing a valve that won't break in the circumstances?

(tempting fate a bit...)....I haven't dropped a valve yet; one engine has done 2 seasons (minus the last race at Mallory) and 3 24 hour races (2 at Snetterton and 1 at Spa) with regular oil changes and occasional valve spring changes. It's had one head off for the scrutineers and one off to retrieve bits of broken cable tie; undisturbed apart from that.

I suppose the answer is to get Norry to build your engines.......

[Trevor Williams]

Why do we consistantly feel the need to beat ourselves up over the camshaft? For every person who says the profile is wrong, there is an equally vocal person who says it isn't.

Didn't bully compare the profile of the standard to club cam?

How to scare people away from racing when money may be tight if we tell them that we will change an expensive part of the engine, again

Great idea as a uni study / project, but leave it at that

Cheers

Trevor

[Paul Robertson]

And we should now have valves that don't break thanks to g&s.

[Marc Fenner]

Yeah i think its going to be a great project hence going for it.

I looked a bully's comparisons and looking at the race cam it looks like it closes far to harshly. It should idealy slow down just before it closes.

What valves are we going for now then paul???

[Paul Robertson]

I have received them today via trevor one piece stainless valves made especially for the club by G&S valves in Godalming,theu are made to our regs and require no modification.
They make 5mm stem 41mm head valves that rev to over 11000rpm so the club's 8mm and 8.5mm stem ones should be nigh on indestructable(we hope).