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DISCUSSION => Engine + Driveline => Topic started by: Torsten on April 18, 2008, 04:15:18 PM

Title: Who drive CR 13:1 Je-Pistons?
Post by: 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

Title: Who drive CR 13:1 Je-Pistons?
Post by: kowalski on April 18, 2008, 10:49:23 PM

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

Title: Who drive CR 13:1 Je-Pistons?
Post by: Torsten 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.

Title: Who drive CR 13:1 Je-Pistons?
Post by: bmwman91 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!