AirSpeed VW Community Forums

Technical => Engine Tech Forum => Topic started by: neil68 on November 21, 2009, 05:54:40 PM

Title: Wiseco 94 pocketed pistons?
Post by: neil68 on November 21, 2009, 05:54:40 PM

I'm increasing my cam lift and CR on my 2332 cc, such that I'll need to use valve pockets.  My 94 Mahles were balanced by drilling under the piston crown by the seller, without my knowledge >:(  Therefore, I'm reluctant to try notching these pistons, take a look at how deep the drilling was in this picture:

(https://airspeedparts.com/forums/proxy.php?request=http%3A%2F%2Fi50.tinypic.com%2Fw8x92q.jpg&hash=81f839739dd670fa0d62ac8587b69e9e73872272)

So, I was considering using Wiseco 94's or possibly the AA's.  Any recommendations from your experience or those you know who have used these kits?

Thanks!

Title: Re: Wiseco 94 pocketed pistons?
Post by: jim martin on November 22, 2009, 04:22:33 PM

first i would make sure you really need to notch your pistons .have you measured the lift and valve to piston clearance ???
ie , when i ran a 86c with a hair under .600 lift and 10.5 :1 compresiion i still had 0.220 " piston to valve clearance .
if you are not sure of the correct way to do this let me know

Title: Re: Wiseco 94 pocketed pistons?
Post by: neil68 on November 22, 2009, 06:27:37 PM

Hi Jim,

My 044 heads have been flycut twice and when I clayed the pistons with the 86C,there was ~0.120" valve-piston clearance.

So, I'm thinking with my Web 226, it may get below 0.100".  I will clay again and see how it looks.

Thanks,

Neil.

Title: Re: Wiseco 94 pocketed pistons?
Post by: jim martin on November 22, 2009, 07:56:29 PM

Yikes!!!!!
if it turns out you need to notch the pistons let me know and i will give you a slick way to do it for under 10 bucks

Title: Re: Wiseco 94 pocketed pistons?
Post by: Darren on November 24, 2009, 04:56:33 PM

Be sure to measure the Exhaust Valve clearance ( it will hit the piston before the Intake in most cases )

Title: Re: Wiseco 94 pocketed pistons?
Post by: neil68 on November 25, 2009, 10:07:51 PM

Thanks for the tip Darren :)