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Adam Site Admin
Joined: 04 Oct 2001 Posts: 682
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Posted: Sun Apr 14, 2002 12:05 pm Post subject: 15:1 static compression |
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For those that don't know, I am about to screw together a G200 for Gerty... It just occurred to me... the G200 almost has a zero deck height and flat top pistons... The G161 early model head I've got has been machined a fair way... I haven't CCed the combustion chambers yet, but I just realised I'm probably going to end up with 15:1 static compression... I guess I'll just disconnect the spark plug leads and run her on diesel then.
No biggy, I can arrange a thicker headgasket and I was going to machine the combustion chamber a bit anyway... Just thought I'd post about it... |
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TXcoupe petrol head
Joined: 05 Oct 2001 Posts: 1675
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Posted: Sun Apr 14, 2002 2:47 pm Post subject: Re: 15:1 static compression |
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or just run it on methanol |
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Slug tinkerer
Joined: 06 Oct 2001 Posts: 196
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Posted: Sun Apr 14, 2002 3:07 pm Post subject: Re: 15:1 static compression |
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I have never heard of a gemini comp ratio that high with standard bits ? I will be interested in knowing what you end up with once you CC the head .. dont forget to CC the head gasket as well .. Michael |
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Ben Wight backyard mechanic
Joined: 04 Oct 2001 Posts: 946
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Posted: Sun Apr 14, 2002 4:24 pm Post subject: Re: 15:1 static compression |
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I'd say you would the most you could get would be about 13:1 with 35cc chambers, which are tiny. I would say more like 12:1 adam, with a heavily machined big valve head. My TD head was machined nearly to the valve seats and had 40cc chambers.
Ben |
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Eggy1 newbie
Joined: 04 Mar 2002 Posts: 6
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Posted: Sun Apr 14, 2002 6:58 pm Post subject: Re: 15:1 static compression |
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have you considered O'rings to keep that kind of comp in?
sound fun thou,
Cheers
Eggy |
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Mark tinkerer
Joined: 04 Oct 2001 Posts: 153
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Posted: Sun Apr 14, 2002 7:28 pm Post subject: Re: 15:1 static compression |
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Ive had heads that are almost machined down to the valve seats as well, and you cant get more than about 11.7:1 with standard bits. I needed lumpy top pistons to get 12.75:1 comp in one motor i built. |
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Adam Site Admin
Joined: 04 Oct 2001 Posts: 682
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Posted: Mon Apr 15, 2002 3:51 pm Post subject: Re: 15:1 static compression |
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Oh well, I had another look at the head at the combustion chambers aren't as small as I remembered, so I'll probably only end up with 10.5:1, which is about exactly what I want! |
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