6 replies to this topic

[craigb78]

hi guys well as a few of you know i am currently building a z20leh for my vx220 and hoping to get power figure from 400-450bhp and torque figures of roughly the same 400-450 ftlb maybe a little less depending on how the mapping goes. but what clutch kit will be good enough for this is the courtenay competition one good enough? also regal d a sach paddel one i think would this one be better? thanks

[The Batman]

you need to speak to courtenays about the klassen clutch or nev

[Duncan VXR]

Bare min will be the helix styleee paddle setup but think the 6 paddle was not upto the job of nev's NONE of the organic versions will stand a chance DG

[craigb78]

cool jsut actually got off the phone to courtenay sport not long ago tbh talking to them about the klassen cams, so when he calls back with a date he can get them i will then ask him about the clutch.

[Nev]

There is no way that a Helix or Sach 228mm clutch will take 450 ft/lb. Im not even sure yet that my hardened Sachs one can handle 400 ft/lb.

If your new engine will rev to 7500 (which should be safeish presumably), you can expect 450 BHP to require a theoretical 315 ft/lb of torque (ie 450/7500*5252). However in practice you will see more torque than that at peak VE due to overspool and transient inertia of the CHRA (i.e. torque spike). Thus I reckon a standard Helix 4 paddle and cover setup will proably be ok for you. However, if you try and go above 450 BHP, I think you'll be slipping.

The alternatives to this setup are costly and have a short life expectancy

Ring me if you want more details.

BTW, if you are getting Klassen cams for £600, I know that you could get the same spec (or more radical spec with bigger lift and longer duration) for £400. Here is a pic of my cams with a massive10.76 mm of lift on the inlet !! They do run lumpy though upto 2000 revs and idle has been set at 1150 revs to compensate for the reversion of gases in/out of the valves when both sides are both open.

I can also get you a GTX3071 cheaply too.

Edited by Nev, 24 October 2011 - 05:53 PM.

[craigb78]

ok nev thanks might have to give you a call again some time also need some advise on running in as i think i am going to leave standard cams and turbo and zlet injectors on it while i run it in for 1000miles so i dont break any expensive parts if anything was to go wrong what sort of a price can you get a gtx3071 with a v band fitting? i need a spec of the cams and i know the klassen ones are proven to be good preformers and it is worth risking having sh** cams for the sake of 400? also the issue i might have is with clearence as im not sure on what the clearence is with my standard leh pistons and a 1.9mm gasket?

[Nev]

ok nev thanks might have to give you a call again some time also need some advise on running in as i think i am going to leave standard cams and turbo and zlet injectors on it while i run it in for 1000miles so i dont break any expensive parts if anything was to go wrong

what sort of a price can you get a gtx3071 with a v band fitting?

i need a spec of the cams and i know the klassen ones are proven to be good preformers and it is worth risking having sh** cams for the sake of 400?
also the issue i might have is with clearence as im not sure on what the clearence is with my standard leh pistons and a 1.9mm gasket?

Yes, you're correct, run in with all your old hardware is the safest and best way to do it (ie, old injectors, MAF, turbo, inlet etc etc).

You will never get the cam spec off Klassen, it's a guarded 'secret'. However, its not rocket science to design cams. Mine were pretty racey, with a duration of 276 degrees on the inlet. I'd recommend a bit less for you (like 265). I do understand that you want to install cams that are proven to work though, so maybe get the Klassen ones (even if he is robbing you blind)!

Turbo quote coming your way soon by PM.

Nev.