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Location:
Adelaide
Registered:
May 2003
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GZE and HKS head gasket
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Thu, 03 February 2005 06:56
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ok. i think i might just have wasted a heap of cash....
bought a HKS 2mm head gasket for my GZE rebuild. we looked up the specs in the HKS book, and apparently this gasket is supposed to set comp. ratio at 8.9:1.
now, i was just looking in another post and my GZE (AFM, coil pack type) has 8.0:1 to start with.....
what do you guys think i should use???? (i have a new genuine gasket too) id like to use the HKS item but will the comp be too low. i have custom pulley to run 13psi too. and all the good stuff for the rebuild (injectors, ecu, ported head, cams...blah blah)
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Location:
cambo
Registered:
May 2002
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Re: GZE and HKS head gasket
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Thu, 03 February 2005 10:12
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there are two dif comp ratio gze's, i dont know what they are but maybe theres a 9.0 and that gasket drops .1?
im running a HKS decompression metal head gasket tho im not sure the specs, havent had troubles.
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: GZE and HKS head gasket
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Thu, 03 February 2005 12:57
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there is only the 8.0:1 and 8.9:1 c/r ratio 4agze's.
how thick is the genuine one you have?
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Location:
Melbourne
Registered:
May 2002
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Re: GZE and HKS head gasket
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Sat, 05 February 2005 02:57
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It depends upon which GZE pistons you have.
I have just bought a 2.0mm HKS gasket too. I'll be using the 8.0 GZE pistons. Max 11.7psi boost.
As far as I can tell, the HKS figures are based upon the Bigport 4AGE pistons (8.5:1).
From my calculations, my setup gives the following compression:
COMPRESSION RATIO CALCULATOR
Fill in Numbers 1 to 8 to give an answer
1 . Piston Diameter 81.50 mm
2 . Piston Stroke 77.00 mm
3 . Piston Dish/Crown 12.00 cc
4 . Number of Cylinders for a crowned piston
5 . Head Gasket Cylinder Diameter 82.00 mm
6 . Head Gasket Thickness 2.00 mm
7 . Percentage of Compression 0 %
8 . Volume of 1 Combustion Chamber 37.00 cc
1 Cylinder Capacity 401.69 cc
Engine Total Capacity 1606.78 cc
Volume of Compressed Head Gasket 10.56 cc
Volume of Combustion Chamber 37.00 cc
Compression Ratio 7.74 : 1
I'm sure I'll be corrected if I'm wrong, but I've gone for a lower compression ratio as there's to be no intercooling. Whether or not you use intercooling, a lower compression ratio will allow you to use higher boost (without detonation).
For 13psi, I'd be going for the 2.0mm gasket.
I can send you the calculator spreadsheet for the above if you like.
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Location:
Adelaide
Registered:
May 2003
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Re: GZE and HKS head gasket
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Sun, 06 February 2005 05:55
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cool thanks for all the info.....if you could send that calculator that would be sweet! i can use it at work too.
cheers
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