Cylinder Head Skim markers ???

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Re: Cylinder Head Skim markers ???

13 Jan 2015 15:11
#658622
ok about 0.4 - 0.5mm I guess allow about 0.1mm for the paint., so maybe around 0.5mm Are the combustion chamber cc within spec?

Getting 1.0 mm on my GPz1100 B head, don't think it has been skimmed.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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Re: Cylinder Head Skim markers ???

13 Jan 2015 17:27
#658627
I think the number's will come up diff, depending on what head you have.
I don't think comparing a KZ550 head to a KZ1000 would give valid info.

Let's start a list of what the head's you have come up.
I did a quick measure on both my GPz750 head's tonight.
'83 ZX750A1 .035
'84 ZX750A2 .035
1980 KZ650 F1
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Wiseco 810cc kit.
Zukiworks racing ported head.
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  • 531blackbanshee
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Re: Cylinder Head Skim markers ???

14 Jan 2015 05:55 - 14 Jan 2015 06:05
#658645
does it look as tho the pads were machined from the factory?
or are they as cast?

leon

p.s.
cc'ing the combustion chambers is probably the best way to decide what you believe has been done to them
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
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Last edit: 14 Jan 2015 06:05 by 531blackbanshee.

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Re: Cylinder Head Skim markers ???

14 Jan 2015 14:21 - 14 Jan 2015 14:24
#658702
They don't appear to be machined, but they are smoother than the fin surface around them, so maybe they aremachined or at least a very smooth part of the casting. I'm not even sure they are actually parallel to the head surface. It looked like one edge had more gap than the other edge, but that could have been an optical illusion, or due to the paint or corrosion, in my case.
1981 KZ550 D1 gpz.
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Last edit: 14 Jan 2015 14:24 by loudhvx.

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Re: Cylinder Head Skim markers ???

15 Jan 2015 06:26
#658753
it seems unlikely the factory would use an as cast finish for a reference point,considering casting shrinkage.

leon
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

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Re: Cylinder Head Skim markers ???

15 Jan 2015 10:09
#658770
Is it possible that pad was for some other purpose, like maybe to help with pulling the head?
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

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  • tachrev
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Re: Cylinder Head Skim markers ???

15 Jan 2015 13:44 - 15 Jan 2015 13:45
#658787
I would think that the best reliable ways to test for a cut head would be to cc the chamber and compare that to a known stock head....or measure from the cam cover gasket surface to the head surface and compare to a known stock head.

I'm surprised at the total lack of chamber cc numbers for stock KZ heads on any forum. I guess since no one likes cutting heads, they just run pop up pistons and go with the manufactures rated compression ratio,

Just seems odd compared my past experience building car engines for performance applications.
1977 Kawasaki KZ1000 : Street/Strip
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Last edit: 15 Jan 2015 13:45 by tachrev.

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  • Patton
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Re: Cylinder Head Skim markers ???

15 Jan 2015 14:03
#658789
tachrev wrote: I would think that the best reliable ways to test for a cut head would be to cc the chamber and compare that to a known stock head....or measure from the cam cover gasket surface to the head surface and compare to a known stock head.

I'm surprised at the total lack of chamber cc numbers for stock KZ heads on any forum. I guess since no one likes cutting heads, they just run pop up pistons and go with the manufactures rated compression ratio,

Just seems odd compared my past experience building car engines for performance applications.

Covered in FSM for 1977~1979 KZ1000:





Good Fortune! :)
1973 Z1
KZ900 LTD

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Re: Cylinder Head Skim markers ???

15 Jan 2015 18:12
#658802
Wow, incredible. Good to know!

It's not in the Z1 manual, I checked. It is in one of the I model manuals I've seen (39.5-40.3ccs)

Thanks.
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Re: Cylinder Head Skim markers ???

19 Jan 2015 14:42
#659121
so that is a start, any more cylinder heads to measure? 5 minute job with a straight edge and feeler guage.

Another method might be finding the total height of the head by using verniers in the camchain tunnel.

Working out CR and dialing in cams isn't for everyone and if there is a sure fire way of measuring as to how much a head has been skimmed it would be good to know.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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Re: Cylinder Head Skim markers ???

22 Jan 2015 00:21
#659333
Could these square pads not be skim markers, but where something from the casting manufacture?

Does anyone here have any zx550 and or gpz11 b head they could measure total thickness of, through the camchain tunnel with verniers,plus the clearance between the gasket face and this mystery square pad?
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  • zed1015
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Re: Cylinder Head Skim markers ???

22 Jan 2015 03:45
#659335
Those pads are not skim markers, just remnants of the casting process.
Only way to check for skimming is combustion chamber volume and appearance of the gasket face.
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