Gen3 1157cc blew head gasket - Kawasaki ZX-10R.net
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post #1 of 19 Old 12-31-2017, 12:30 PM Thread Starter
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Gen3 1157cc blew head gasket

I built a 2010 engine, +3mm bore +4mm stroker crank JE stroker pistons 2014 velocity ported head 2014 throttle bodies & round venturas back cut * polished transmission with ceramic bearings, so to be gentle i fitted the stock Gen4 cams on stock timing with a standard thickness 79mm head gasket put her on a dyno where a stock 2017 GSXR 1000 put down 190 RHP she put down 209 DIN power with 96flb torque. I go away inspect the bores etc decide its all good & fit Big Kent cams and dial emm in 112 112 go back dyno expecting bike to come alive and after bout 40 45 mins dyno time re mapping her pish starts spewing out expansion tank i got bubbles so most likely head gasket, well im gonna tear her down (American Slang) tomorrrow have a look

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post #2 of 19 Old 12-31-2017, 12:46 PM
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Originally Posted by michael4012 View Post
I built a 2010 engine, +3mm bore +4mm stroker crank JE stroker pistons 2014 velocity ported head 2014 throttle bodies & round venturas back cut * polished transmission with ceramic bearings, so to be gentle i fitted the stock Gen4 cams on stock timing with a standard thickness 79mm head gasket put her on a dyno where a stock 2017 GSXR 1000 put down 190 RHP she put down 209 DIN power with 96flb torque. I go away inspect the bores etc decide its all good & fit Big Kent cams and dial emm in 112 112 go back dyno expecting bike to come alive and after bout 40 45 mins dyno time re mapping her pish starts spewing out expansion tank i got bubbles so most likely head gasket, well im gonna tear her down (American Slang) tomorrrow have a look
Ouch. Good luck mate. Hopefully it's something small, easy and inexpensive.

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post #3 of 19 Old 01-01-2018, 05:49 AM Thread Starter
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Cheers Victors ?

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post #4 of 19 Old 01-01-2018, 05:53 AM Thread Starter
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OK well I'm feeling like I was lucky, it would have ended worse. Number 1 blew out to jacket as can be seen in the pictures. What is alarming is the spark plug tip.
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[SIGPIC][/SIGPIC]192MPH stock engined 2008
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post #5 of 19 Old 01-01-2018, 07:58 AM
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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 compression to a more manageable level. Keeping the cranking compression under 200-220 will help alot.

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post #6 of 19 Old 01-01-2018, 09:14 AM
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detonation-period. pic tells it all. blown hg/burned strap.
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post #7 of 19 Old 01-01-2018, 11:45 AM Thread Starter
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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.
Hi bud, no i havent uprated the bolts but im gonna do that now anyhows wether it was pre det or not Cranking pressure .....ummmm well you got me there i figure the cam numbers need playing with.

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post #8 of 19 Old 01-01-2018, 11:50 AM Thread Starter
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detonation-period. pic tells it all. blown hg/burned strap.
Absolutely mate i think 1157cc is a lot in a skimmed 0.6mm head but ultimately long low down pulls on the dyno gave a few knocks and blew her out im reckoning on adding 0.2 to the gasket. The ignition is fairly neutral throughout, with quality pump gas (american slang) it gave me a little wake up call.

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post #9 of 19 Old 01-01-2018, 11:57 AM Thread Starter
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To be honest i just found out that GSXR 1000 putting down 190 was with a slip on filter & flash. I may just put the stock cams back in and enjoy it for a while, the big cams can be difficult to get right.

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post #10 of 19 Old 01-01-2018, 02:33 PM
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Absolutely mate i think 1157cc is a lot in a skimmed 0.6mm head but ultimately long low down pulls on the dyno gave a few knocks and blew her out im reckoning on adding 0.2 to the gasket. The ignition is fairly neutral throughout, with quality pump gas (american slang) it gave me a little wake up call.
Your squish clearance will increase and detonation will get worse with a thicker head gasket, you might want to rethink your plan.
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