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Piston to head clearance
- mark1122
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Detonation is the collision of more than 1 flame front, cased by excessive heat and pressure in the combustion chamber cause the air/fuel mixture to auto ignite. Often too much compression.
Pre ignition is spontaneous or uncontrolled combustion at the incorrect time. Usually caused by a hot spot . Glowing hot carbon, sharp edges (remember to smooth all sharp edges on those new pistons) , Thin valve edge margins, lean fuel mix, detonation can create hot spots and thus pre ignition.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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- mark1122
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id stick with the .050,i pushed the limits years ago and it cost me a brandnew motor with less than 50 miles on it,i did manage to save the 73 z1 engine cases but crank ,pistons and head were destroyed in the process!:S :blink: :ohmy: :huh: :dry: the motor was built for a hot streetbike but i somehow got talked into putting it into a dwarfcar that needed a motor.it would of been fine in a motorcycle but sitting sideways in that dwarf car with little airflow to #s 1 2&3 brought out expansion issues and took it out hard!but it was smoking every car on the track for like 9 laps before it let go!:woohoo:remember dragbikes that only run a 1/4 mile at a time and get cooled off can get away with a lot more than a streetbike ridden all day in traffic
Do u know what the squish clearance was on that motor?
It is said that the best tunners stand beside the largest pile of scrap motors.U just have to keep reducing clearances untill the motor tells u it cant take anymore.:woohoo:
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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Still recovering,some days are better than others.
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- mark1122
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76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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Still recovering,some days are better than others.
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- mark1122
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I havent got my motor out of the bike yet. I did get the bike down to the basement though.
I have to insulate my basement before i tare into this rebuild.
Allways lots to do.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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- Injected
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(more on the exh because of the heat)
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- mark1122
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Any 2V Kaw head - MINIMUM .050" intake and .080" exhaust
(more on the exh because of the heat)
Not piston to valve but piston to head.
Thanks anyways.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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- Snakebyte
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Does any one know the compressed thickness of the head gasket, for graphite and shim. As this will play a role in quench area?
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- mark1122
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I heard back from a guy who succesfully ran the piston flush with the deck and had a .043" compressed head gasket.
= .043" squish.
This was on a street riden KZ.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.
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This is my 1st. post on this site.
I was told a number of years ago by a man, let's call him B.H. He told me that when you run zero deck height (pistons flush with the top of the cylinder)It increases bottom end and mid range. Your top end MPH will be hurt greatly. He said these bikes had good torque from the factory but fell short in the MPH area. He told me the answer was to have a .035" deck height to increase my MPH. I tried it, and it made the differance between night & day. On all of my bikes I shim or mill the cylinder until I reach my .035" deck height. Chevy's seem to like zero deck height but not Kawasaki's. Maybe next time you build an engine you might just give it a try!
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