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 Post subject: Raise compression
PostPosted: Sat Mar 18, 2017 4:22 pm 
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Joined: Thu Oct 30, 2014 3:54 am
Posts: 6
Location: Romania
Hi! I need help please. how much is safe to cut without ruining valve seats from head to raise compression...i have g13b piston whith 10:1 compression.Tnks!


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 Post subject: Re: Raise compression
PostPosted: Sun Mar 19, 2017 12:13 am 
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Joined: Sun Feb 23, 2003 4:16 am
Posts: 8033
Location: Ontario, Canada
About .5mm, but you can cut it on an angle, taking more from the exhaust side

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Contact 3tech: g10pro@rocketmail.com


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 Post subject: Re: Raise compression
PostPosted: Sun Mar 19, 2017 4:49 am 
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Joined: Thu Oct 30, 2014 3:54 am
Posts: 6
Location: Romania
And the exhaust side how cut?in Romania don't have performant mechanic for cut to ungle...and had gasket avaible here is 1.2 and 1.6mm...


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 Post subject: Re: Raise compression
PostPosted: Sat Jun 24, 2017 4:11 pm 
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Joined: Tue Sep 06, 2016 6:10 pm
Posts: 3
Location: UK
Can the compression be raised and it not adversely affect the cam timing?

I'm asking as I would like to raise the compression on a racing engine, but the regs don't allow adjustable cam pulleys.


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 Post subject: Re: Raise compression
PostPosted: Sat Jun 24, 2017 5:45 pm 
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Joined: Sun Feb 23, 2003 4:16 am
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Location: Ontario, Canada
Yes. You can't take that much from the head, but even a little will help compression, and this motor wants compression.

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 Post subject: Re: Raise compression
PostPosted: Mon Jun 26, 2017 3:52 pm 
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Joined: Tue Sep 06, 2016 6:10 pm
Posts: 3
Location: UK
How much is the absolute maximum, without affecting the cam timing or piston to valve contact? I'm using oem ukdm gti cams and pistons.

I'm new to the g13.


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 Post subject: Re: Raise compression
PostPosted: Mon Jun 26, 2017 3:57 pm 
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Joined: Tue Sep 06, 2016 6:10 pm
Posts: 3
Location: UK
I can take material from the block instead of the head if it yields more compression. As I said, I'm new to the g13 so I haven't had one apart to look at the shape of the combustion chamber.


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