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BIKELAND > FORUMS > ZX12R ZONE.com > Thread: piston to head clearance NEW TOPIC NEW POLL POST REPLY
ZX12-5807


Expert Class
Posts: 129
posted April 13, 2012 12:24 AM        
piston to head clearance

Just got my Cylinder and Head back from the machine shop where I had both resurfaced and the head oringed for the 1317cc block. I need to know what the minumum piston to head clearance would be? I put clay on the pistons then disassembled and measured and came out with .040". Is this enough clearance or should I ad another base gasket?

2001 ZX12
SBM 1317cc
Carillo Rods
Lee's Head
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2001 ZX12 1287cc
2001 ZX12 1317cc Lee's head

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psycho1122


Pro
Posts: 1577
posted April 13, 2012 05:06 AM        
If I remember right, my 1270 w/ 14:1 CR was at .027

Ran great!
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You say PSYCHO like it's a BAD thing!!

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KZScott


Needs a life
high on speed
Posts: 7150
posted April 13, 2012 06:58 AM        Edited By: KZScott on 13 Apr 2012 14:04
psycho, was your .027 a direct measurement of the squished engine clay, or was it the clay minus half the oil clearances on the mains, rods, and wrist pin?
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01 ZX-12R 8.84 @ 156.3 no bars, DOT rubber, Pump Gas NA..... turbo 8.47 @ 164
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot... turbo 8.32 @173
00 ZX-12R NA 1: 222.04 1.5: 226.39 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB

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psycho1122


Pro
Posts: 1577
posted April 14, 2012 09:53 AM        
Clay.

You could see where the pistons had no carbon build up on the exhaust side quench area. I asked Doug M. about that and his exact words were "That's Perfect"!!

It's tight, but keeps the combustion chamber detonation free on 91 pump set to 12.7:1 A/F.

I may be going back into the engine in the near future to check things out, look for issues and re-degree cams to 105/105 to go along with some additional head work.

Why do you choose 106/106?!?
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You say PSYCHO like it's a BAD thing!!

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ZX12-5807


Expert Class
Posts: 129
posted April 16, 2012 10:05 PM        
Did some research from previous discussions on here and I have come to the conclusion that my piston to head clearance is good. There are a lot of good threads on here on the subject. So thanks for the replys and information. Now on to finish up my motor, next is cam timing. I'm thinking 105/107 should be good.
____________
2001 ZX12 1287cc
2001 ZX12 1317cc Lee's head

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