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MTC-piston clearence question
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MTC says the clearence for street pistons (10,5:1) is only
0.0005 to 0.01 ".
This is only 0.0127 to 0.025 mm (I´m from Germany ),Kawasaki pistons have 0.04 to 0.07 mm.
Are the MTC clearence specifications really correct ?
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- JDScherz
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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- PLUMMEN
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did you check the deck height before final assembly of motor?how about valve to piston clearance?theres more involved to engine building than just bolting a bunch of parts togetherGood Luck..I own the very same pistons. And 3 exhaust valves and 1 Intake valve later and 2 base gaskets(stacked) and after sending them back to MTC and paying them 150 to remachine them down they are GREAT!? I know prostock bikes use them...but we are not prostock bikes, we are looking for reliability on the steet. Use them as ashtrays and buy WISECO! Just a thought...
Still recovering,some days are better than others.
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- steell
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KD9JUR
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- 77_650B1
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Anyone that runs with .0005" piston to cylinder clearance has a lot bigger balls than I do :woohoo:
Big ol balls. :ohmy:
1977 KZ650-B1
-Dual Discs
-Dyna-S
-WG Coil Mod
-Alloy Wheels
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- gane
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[img][/img] 1977 KZ1000A1
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- shighley
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\'74 Z1-A, Bought new, worn out 3 times, being ridden now
\'83 XVZ12TK, was daily driver until frame broke
\'78 KZ650SR-D1A, Son's bike, I'm the wrench (He's young)!
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- BSKZ650
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77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
piglet, leggero harley davidson
SR, Ride captian, S.E.Texas Patriot Guard Riders.. AKA KawaBob
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- APE Jay
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Jay
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- 77_650B1
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Is it possible the MTC pistons are cast and the Wiesco are forged, thus explaining the difference in clearance requirements? Seems I remember that forged ones required more clearance as they swell more coming up to temperature. Something about the material grain structure inherent to both processes. On the other hand I could be full of schiet. Happy Friday and ride safe, Steve
Since Jay says they're forged, we'll take his word, he's the man. But I'll add my $.02. You're right about microstructure. Maybe MTC uses a different alloy with a different thermal expansion coefficient, or a different heat treatment with the same results. They wanted tight clearances, and engineers can do this. I'm sure I could with a but of time, a materials lab like the one at my school, and the Aluminum volume of the Metals Handbook. And as for galling the piston, I would venture to say that smaller clearance would reduce it, not increase it. Greater moment arm for galling against the cylinder wall if you have more clearance.
1977 KZ650-B1
-Dual Discs
-Dyna-S
-WG Coil Mod
-Alloy Wheels
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