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sarav1200
Comp Ratio?
#1
Not too shy to talk
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2004/3/11 6:05
From Sydney OZ
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hey guys... does anyone know the maximum Cr you can have running pump fuel (98 oct.)?? roundabouts anyway...
thanks

Posted on: 2006/3/6 12:50
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vixen
Re: Comp Ratio?
#2
Home away from home
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2005/2/23 6:14
From gold coast QLD australia
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Matts 120Y...1270cc motor used to run 11.2:1 but would run on a bit so i lowered it to 10.5:1 and its ok and still runs well,has a 32/36 weber on it.GREG

Posted on: 2006/3/6 13:08
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Mildman
Re: Comp Ratio?
#3
No life (a.k.a. DattoMaster)
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2003/9/2 6:01
From SE Melbourne
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From my ricer days I understood 12:1 was the limit on high octane pump fuel.

That meant about 14psi boost on a static 8.5:1 engine.

Posted on: 2006/3/6 23:23
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hotrod88
Re: Comp Ratio?
#4
Home away from home
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From my own exp. 11:1 would be as high as I would go on pump fuel, & in some cases that would be pushing it , depending on how much timming your running & such.

Posted on: 2006/3/7 4:56
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Mildman
Re: Comp Ratio?
#5
No life (a.k.a. DattoMaster)
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11:1 is probably fair with many engines I would say.

The 12:1 was in an RB20DET motor in a friends race car. He had a non turbo engine and boosted it with an enormous turbo, getting to around that 12:1 mark.

He blew it up twice....so maybe 12:1 is a little far...

Posted on: 2006/3/7 22:23
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