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ddgonzal
Re: A12GX Cam specs
#6
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1.44 is the stock rocker ratio. Reference: Rockerarm ratio??

Yella Terra has the roller 1.5 and 1.6.

Posted on: 2003/7/25 6:11
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britishcarfreak
Re: A12GX Cam specs
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Cool - that helps.

Was it .331 at the valve or was that at the cam?

Does anyone know the ratio introduced by the rockers? On my other car the rockers are 1.45:1 or something like that. And thats how I work out how far the valves are theoretically moving compared to how much the cam is lifting.

I'm still after power band details.

Posted on: 2003/7/25 5:39
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ddgonzal
Re: A12GX Cam specs
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GX camshaft: .331" lift, 256 degrees. Requires the double valve springs.

The FIA docs (in our Downloads section) says:

Valve opens at BTDC 20 degrees plus/minus 7 degrees
Valve opens at ABDC 56 degrees plus/minus 7 degrees
Valve opens at BBDC 58 degrees plus/minus 7 degrees
Valve opens at ATDC 18 degrees plus/minus 7 degrees

This should be the GX engine? They had to homologate it, the FIA docs are for the twin-Hitachi engine.

Posted on: 2003/7/25 5:28
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britishcarfreak
Re: A12GX Cam specs
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Nope - they're off a Triumph Dolomite Sprint.

They're 13" x 5.5"

Posted on: 2003/7/23 2:04
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matbighat
Re: A12GX Cam specs
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Are those Cosmics on your spitsun? I've got a set too.

Pic 1

Posted on: 2003/7/23 1:59
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britishcarfreak
A12GX Cam specs
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What are the specs of the standard A12 GX cam?

Power band (typical)
Cam lift (plus equivalent valve lift)
Duration
open/close inlet exhaust angles etc.


Posted on: 2003/7/23 0:58
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