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Engine Specific Info and Questions => IDI Engine => Topic started by: Benjamin on February 28, 2008, 07:37:15 am

Title: lowering the compression
Post by: Benjamin on February 28, 2008, 07:37:15 am

Is it possible to lower the compression when you take out the glow plugs and screw in just a bolt?
how much should the CR lower?
not for daily use, it will start with 'start pilot'

Greetz, Benjamin

Title: lowering the compression
Post by: jimfoo on February 28, 2008, 08:07:01 am

I'm sure it would lower a little, but not very much. I think the best way to lower it would be take some off the pistons where they have already been machined.

Title: lowering the compression
Post by: Benjamin on February 28, 2008, 10:38:08 am

how can you calculate the change in CR when you know how much cc diffrence the bolt instead of the glowplug is.

Greetz, Benjamin

Title: lowering the compression
Post by: burn_your_money on February 28, 2008, 10:56:17 am

Perhaps this page will help you

http://vwdiesel.net/phpBB/viewtopic.php?t=12633

Title: lowering the compression
Post by: andy2 on February 28, 2008, 04:17:16 pm

I've got specially machined bolts to replace my glowplugs to help with lowering compression.I'm guessing that my Cr is 18.5-17.5:1 now with the masive prechambers that are in my head.