I have some oem pistons which you can swap with me for your low comp ones
What pistons are you running if they're not low comp ones!
Posted 24 April 2013 - 03:35 PM
I have some oem pistons which you can swap with me for your low comp ones
Posted 24 April 2013 - 03:49 PM
Please be advised that the CR advertised for Wiseco pistons is with a 1mm thick gasket.
A Z22se or Z22yh head gasket is not 1mm thick
Posted 24 April 2013 - 04:00 PM
Posted 24 April 2013 - 07:03 PM
Posted 24 April 2013 - 07:05 PM
Posted 24 April 2013 - 07:09 PM
Posted 24 April 2013 - 07:29 PM
Edited by oakmere, 24 April 2013 - 07:31 PM.
Posted 24 April 2013 - 07:32 PM
Alanoo had the same issue an got low comp pistons by mistake. He skimmed the head by 1.4mm which is the max before you hit the oil restrictor.
http://www.z22se.co....r-project.6314/
Posted 24 April 2013 - 08:03 PM
Posted 24 April 2013 - 08:50 PM
Mine has seen 8600 rpm on multiple occasions (and I have datalogs proving it), but I was generally putting the limiter at 8200 rpm on track
Posted 24 April 2013 - 09:16 PM
Keep the pistons if you have already fitted them and skim the head
Posted 24 April 2013 - 09:36 PM
Alanoo had the same issue an got low comp pistons by mistake. He skimmed the head by 1.4mm which is the max before you hit the oil restrictor.
http://www.z22se.co....r-project.6314/
Nop I got 10:1 pistons and skimmed 1.4mm
It's the bore that was wrong and fixed with a rebore.
Mine has seen 8600 rpm on multiple occasions (and I have datalogs proving it), but I was generally putting the limiter at 8200 rpm on track
Posted 24 April 2013 - 09:44 PM
I read somewhere that they are :
Z22yh gasket 0.37mm
Z22se gasket 0.49mm
Z20net gasket 0.98mm
http://www.z22se.co....r-sc-use.18077/
So you have about 0.5 more CR than advertised . Do you have standard size pistons or overbored ?
It also influence slightly the static CR
Posted 24 April 2013 - 10:08 PM
Thanks!Have you considered whether the oil pump on the Z22 will cavitate the oil at those sort of revs? I expect Vocky or someone will know. Looks like a lot of new bits in that engine. Good luck.
Posted 25 April 2013 - 06:27 AM
Posted 25 April 2013 - 07:49 AM
If you skim too much the chain tensioner cannot cope and you need to fit a manually adjustable chain adjuster.
Keep the pistons if you have already fitted them and skim the head
Ok batmanmulling it over.....looking at the engine..... ThIs suggestion is starting to make sense!
I need to skim off a millimetre, is that correct? Can I go further? Mill and a half?
Posted 25 April 2013 - 08:01 AM
I have some oem pistons which you can swap with me for your low comp ones
What pistons are you running if they're not low comp ones!
Posted 25 April 2013 - 08:06 AM
Posted 25 April 2013 - 08:23 AM
Posted 25 April 2013 - 08:25 AM
it can but depends on what piston choice you made, afaikDoes skimming so much off the head not have a detrimental affect on the squish?
0 members, 0 guests, 0 anonymous users