Author Topic: Who drive CR 13:1 Je-Pistons? (Read 2533 times)

Torsten · « **on:** April 18, 2008, 04:15:18 PM »

Hi guys,

as written in the title, I like to know if anybody use the Je-Pistons with a CR of 13:1 at the M42 engine.
I wrote an email to JePistons but it seem that they are too busy to answer on it.. :mad:

Thx
Torsten

kowalski · « **Reply #1 on:** April 18, 2008, 10:49:23 PM »

what did you want to know, and why are you going with 13:1?

Torsten · « **Reply #2 on:** April 19, 2008, 06:04:36 AM »

I want to know how the higher CR is realized because we have to increase CR to 13.4.
Furthermore I like to know how many millimeters we can lift the valves at upper dead center without touching the piston.

bmwman91 · « **Reply #3 on:** April 20, 2008, 11:58:59 AM »

Even in stock configuration, the valves will interfere with their 9.9mm lift if they are fully extended with the piston at TDC. With 13.4:1 pistons, they better have some deep valve reliefs lol!