Bought a Zenki with a Blown motor

Post by **In The Works** » Sat Nov 22, 2008 11:27 am

Here is a picture of the cylinder that decided to take a break. Any ideas on where she went wrong. Alos am researching my rebuild right now and wanted to get some opinions. I intend to KA-T in the future but it will be running NA for a while as i get the funds for the turbo setup. Question is what is a good compression ratio for a KA-T motor that will still run ok NA for a while. I don't really intend on going over 13-15psi on it once the turbo is on.

Post by **hannibal** » Sat Nov 22, 2008 12:26 pm

I see you already found the KA-T forum!

Sounds like youre planning to swap in another KA-T then turbo it. You should be able to run stock 9.5 CR with a turbo at 12-15psi. But if youre planning to rebuild a motor and run it before going turbo, I really cant say what CR to use. Anywhere from 8.5 to 9.0 is common on built motors. Dont know how these would run with a turbo though...

Welcome again!

Post by **In The Works** » Sat Nov 22, 2008 7:52 pm

So anyone have any ideas on what happened to that cylinder??

Post by **Slipstream** » Sat Nov 22, 2008 7:57 pm

detonation

Post by **PorkChopExpress** » Sat Nov 22, 2008 8:03 pm

im gonna say pre ignition.

Post by **Charlie240sxt** » Sun Nov 23, 2008 6:34 am

I say running really ****ing lean see how its melted the sides of the pistons at the corners and its all black this cylinder was super hot whats the rest look like??

Post by **In The Works** » Sun Nov 23, 2008 8:02 am

Here is one

Post by **In The Works** » Sun Nov 23, 2008 8:05 am

Post by **SullivanRacing06** » Thu Nov 27, 2008 7:34 am

high rpms and detonation = that f-ed up cyl, dohhh

Post by **Charlie240sxt** » Thu Nov 27, 2008 8:11 am

It looks just like my buddys sr that was pushing 18psi on a t25/370ccc burnt up!!!! trash that block get a new one

Post by **DevilMB3017** » Thu Nov 27, 2008 8:57 am

PRE-detenation.

Detenation is supposed to happen. It's not suppose to happen early or late on the cycle.

It looks more like cyl 3 didn't get any oil, the way it's scorched. Or no fuel and it started to over heat a lot.

Post by **zapracing** » Sun Dec 07, 2008 5:35 pm

i ran 9.0 n/a before i put my turbo on it ran ok bad gas mpg and had to pat the gas at stoplights but all worth it once turbo was on and im at 20psi now no problems but im running stock boar its a tough motor

Website · Post by **motoman399** » Tue Dec 09, 2008 10:17 am

a friend of mines piston looked just like that in his ka-t and it was a bad injector

Bought a Zenki with a Blown motor

Bought a Zenki with a Blown motor

Re: Bought a Zenki with a Blown motor (In The Works)

Re: (In The Works)

Re: (Slipstream)

Re: (PorkChopExpress)

Re: (Charlie240sxt)

Re: Bought a Zenki with a Blown motor (In The Works)

Re: Bought a Zenki with a Blown motor (zapracing)

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