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TOPIC: Cylinderhead

Cylinderhead 04 Nov 2018 08:04 #793357

  • godzilla
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Hi

What's the difference between a cylinder head for a gpz kz550 H from 1982 and a cylinderhead from 1984 gpz zx550A?
Are the combustionchambers bigger in a zx550A.
Thank's in advance

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Cylinderhead 04 Nov 2018 18:53 #793380

  • loudhvx
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There are probably many minor differences starting with the valve cover emissions port valving and plumbing.

The intake ports are probably similar if not the same since the intake manifolds are nearly the same size if not the same.

The valves are the same.

If you asking regarding the swapping of cams etc, this link has some info:
s3.amazonaws.com/gpzweb/CamsKZZXZR550500...KZZXZR550500400.html

The Zx550 pistons have a higher crown with deeper valve pockets, but the overall compression ratio is the same as the earlier Gpz's so the overall combustion chamber volume has to be the same. But I'm not sure if it's only the pistons that are different, or if the head has a different shape chamber to make up or take up volume. That is, I'm unaware of any volumetric differences in the head in regards to compression ratio.
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Cylinderhead 05 Nov 2018 04:42 #793385

  • CoreyClough
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According to Kawasaki's Parts Diagrams, the H and A Model Heads are listed with different part numbers. In my years looking up parts for the GPz550, the part number can change from year to year if there is something as a different paint used for the same part. Not owning an H Model Head, I only know the A Models. Head Gasket shows to be different, and even the intake holders are not the same. Intake holder o-rings are even shown to be removed from the A Model, but they still have the groove for them, so I'd still use them.


Unless you have them side-by-side, I wouldn't be able to tell the difference.


H Model Head Diagram:
www.kawasaki.com/Parts/PartsDiagram/145689/1983/KZ550-H2

A Model Head Diagram:
www.kawasaki.com/Parts/PartsDiagram/137600/1985/ZX550-A2

Comparing the two valve diagrams, they are exactly the same. Like Lou stated it could be port, or combustion chamber differences.
'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp
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Cylinderhead 05 Nov 2018 08:17 #793393

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Thanks for the answer and the link to the information about the cam switch. My thought was to switch to zx camshafts as you mentioned. I'll read the informative link you provided and then decide if I'm going to change cams.
Again thanks for your reply.

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Cylinderhead 05 Nov 2018 10:09 #793397

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Zx cams *should* be swappable as long as you use the normal Kz timing, which is the preferred timing anyway, according to Corey. (His trophy collection is hard to argue against.)

Someone else reported swapping Zx cams into a gpz H or D motor with no issues, but I don't think we have any numbers on what the clearance actually is.
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