Gen3 1157cc blew head gasket - Page 2 - Kawasaki ZX-10R.net
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post #11 of 19 Old 01-01-2018, 02:38 PM
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yup, you have some issue to tend to, lol

did you upgrade the head bolts??

what was your cranking compression?? Lowering the 112 to something like 105 will drastically effect compression to a more manageable level. Keeping the cranking compression under 200-220 will help alot.
Lowering the intake from 112 to 105 will advance the cam timing, which will raise cranking compression even more.
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post #12 of 19 Old 01-03-2018, 12:59 AM Thread Starter
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Your squish clearance will increase and detonation will get worse with a thicker head gasket, you might want to rethink your plan.
That doesn't make sense to could you explain that if you reduce compression ratio then you are reducing heat which causes pre detonation.

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post #13 of 19 Old 01-03-2018, 01:33 AM
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That doesn't make sense to could you explain that if you reduce compression ratio then you are reducing heat which causes pre detonation.
Google squish clearance, there are 1000s upon 1000s of explanations and videos. I recommend reading some of them before you spend more money on your engine.

2nd. There is no such thing as pre detonation...............there is detonation and pre ignition.
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post #14 of 19 Old 01-03-2018, 08:41 AM
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coupe is exactley correct. detonation is the result of unburned fuel, sometimes called end gasses, that burn late and violentley after the combustion burn process should be finished. loose squish especially on a big bore with larger squish area will definatley promote detonation. need to always set squish tight as safely possible to avoid pth contact at high rpm for max power and quick burn. practically all engines power made in first 15 degrees engine rotation atdc so end fuel gasses rob power also. t he quick burn flame front does not penetrate the squish area well and fuel vapors are trapped there that burn/explode later as piston travels downward opening up squish area. tight squish forces the fuel mixture out as piston is practically touching head into the chamber under the plug to burn quickley/completley. the turbulence produced forcing this mixture out of the squish also better atomizes fuel to burn quickley. just one cause of detonation, several other factors cause detonation. although tightening squish will raise compression, it will reduce chances of detonation. not a preignition problem, that destroys hp before clean burn combustion even occurs, ur making too much hp/torque for that to be a factor. checking cranking compression after fire up on a new build will always indicate fuel requirements necessary for power/reliability. i think u have some more power to make, but gonna have to adjust some things.
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post #15 of 19 Old 01-03-2018, 09:41 AM
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Some good knowledge here man... these folks are giving you some good info.

...and FWIW, pump gas by itself is a pretty evil thing to tune on a high-specific output motor, at least here in the states with our gas. You never really know what you're getting out of the nozzle when it comes to blended fuels, and you have to be pretty conservative with timing and mixture if you don't know what your fuel is going to do.
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Attack life... it's going to kill you anyway.

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post #16 of 19 Old 01-03-2018, 11:26 AM
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pump gas will absolutley limit hp, dont fool yourself into thinking u can work around your chosen fuels limitations, when building a engine, fuel, intended usage are first considerations. i limit pump gas street engines to about 190-200 lbs max cranking compression after longer duration higher lift cams degreed, heads milled/squish minimized. bigger bore bikes, busa/zx14 i can pump 225-230 same cam/compression mods on stk pistons but pump gas senerio gone as it is unsafe. also cant lower cranking compression to what seems safe on pump gas by moving cam timing higher, that compression returns at high rpm's. cant get it all on pump fuel, especially street ridden where heat becomes a factor. fuel/tuning become critical on high compression engines running top end for any distance. lower compression motor safer, practically as fast, just lacks the torque to get to top speed as quickley from less compression factor. google hp vrs compression charts, some surprising info results.
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post #17 of 19 Old 01-03-2018, 02:56 PM Thread Starter
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Originally Posted by thundercoupe9 View Post
Google squish clearance, there are 1000s upon 1000s of explanations and videos. I recommend reading some of them before you spend more money on your engine.

2nd. There is no such thing as pre detonation...............there is detonation and pre ignition.
Thank you for explaining mate iv been having a look i appreciate the help theres not so many around willing to do that lately.

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post #18 of 19 Old 01-03-2018, 02:57 PM Thread Starter
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Quote:
Originally Posted by thundercoupe9 View Post
Google squish clearance, there are 1000s upon 1000s of explanations and videos. I recommend reading some of them before you spend more money on your engine.

2nd. There is no such thing as pre detonation...............there is detonation and pre ignition.
Thank you for explaining mate iv been having a look and im getting involved with this now so need all the help i can get. There are fewer around willing to help these days.

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post #19 of 19 Old 01-03-2018, 03:05 PM Thread Starter
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Originally Posted by gaz View Post
coupe is exactley correct. detonation is the result of unburned fuel, sometimes called end gasses, that burn late and violentley after the combustion burn process should be finished. loose squish especially on a big bore with larger squish area will definatley promote detonation. need to always set squish tight as safely possible to avoid pth contact at high rpm for max power and quick burn. practically all engines power made in first 15 degrees engine rotation atdc so end fuel gasses rob power also. t he quick burn flame front does not penetrate the squish area well and fuel vapors are trapped there that burn/explode later as piston travels downward opening up squish area. tight squish forces the fuel mixture out as piston is practically touching head into the chamber under the plug to burn quickley/completley. the turbulence produced forcing this mixture out of the squish also better atomizes fuel to burn quickley. just one cause of detonation, several other factors cause detonation. although tightening squish will raise compression, it will reduce chances of detonation. not a preignition problem, that destroys hp before clean burn combustion even occurs, ur making too much hp/torque for that to be a factor. checking cranking compression after fire up on a new build will always indicate fuel requirements necessary for power/reliability. i think u have some more power to make, but gonna have to adjust some things.
Nice one mate look at all the time you took typing that in Im getting the idea now

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