fouled plugs, or apex seal springs that have flattened due to excessive heat from oil washing....

Running that rich without premix will cause you to wipe the oil off of the rotor housing walls and the apex seals. this casues premature wear on the seals and also causes them to get hotter which then flattens the springs.

look for pitted or eroded areas on the leading edge of the apex seal, and flattened apex spring seals. it looks like damage from minor detonation but in reality is caused by overheating of the apex seal from loss of lubrication

kenn

 

Im sorry mate. But the above post is way off.

With the correct ignition you can run the above fuel mixtures, with premix without, OMP or without.

Why do people post when they have no clue?

 

Thanks for all the feedback guys.

Regarding the chipped seal, surely your motor wont sound 100% with the seal damaged? My motor sounds and runs 110% (except for power loss of course). My HKS dump valve did break its internals and I hope nothing went up into the motor.

 

Time for a compression test.

 

What should a healthy motor read with a compression test?

 

Have a look at the turbine wheel , I have seen overly rich mixtures coupled with retarded timing , cause the edges of the turbine blade to melt away ! although you see the boost the response is slower and the actual volume "pushed" is less.

 

hmm....... something like this

 

At least 7 bar/100 psi on all faces.

Also, have you checked to verify that your leading plugs are firing?

 

I have a new set of HKS 10.5's arriving in a few days so will drop those in and report the results. My T04Z has only done about 460 track miles and the blades look sparkling. Also going to lean the car out to 11.5 AFR on the dyno once the plugs are in.

Thanks for the help.

 

No problem.

I don't mean, 'are your leading plugs bad?'

I mean, 'are your leading plugs firing at all?' ie bad coil or bad ignition amp if it's powering the leading coil.

kind of a shot in the dark, but it would explain your problem.

 

GoodFella,

I havent checked that yet, but its definetly something I will do.

Thanks,

 

Hi Guys,

Changed plugs and car is 100% again. Happy it was so simple. Now for a lean out.

Thanks for all the help!

 

Classicauto and I called it

I've learned in this past year the answer is sometimes so simple....

This brings up another item on why race plugs foul so easily sometimes.

Anthony

 

No clue???? check your PM's I will keep this at the PM level.

kenn

 

Because they are cold plugs. They need high temps to be cleand out properly. I had a set of NGK 11 Iridum plugs fail on me after 4 hours of idle and small driving while tuning vacum. Changed the plugs and all was fine. So driving the car easy and having it idle alot will make the plugs foul out if the tune is rough.

It's all about the tune, but the racing plugs do foul faster then the stock plugs ofc.

I change plugs before ever race weekend. And if no race weekend every 1000-1500 miles.

JT