Engine Will Turn But Not Start
 

Afternoon All,

I recently got back back from two days of road racing. The motor became more difficult to start until it would no longer catch. I brought it home and changed the plugs, it has fuel and spark. The compression in both rotors is 45 psi with the top plug in and the tester in the lower holes. I can smell fuel out the tail pipe as well as thru the open spark plug rotor hole and I have spark in all the plugs.

Any ideas? It ran flawlessly both days until it it would only crank and not catch....

Jim

Isn't 45psi very low?

Not sure I am new to this type of motor. The car ran really strong at the track once it did start. Could be centrifical force and better compression once the engine catches....but that is what it is off the battery.....?

Jim

air, fuel, spark, compression

EDIT: did you try the un- flooding procedures? if you know it's getting air, you smell gas, you're getting spark, and the engine isn't blown it should fire.

that would make sense....it should run. As for de-flooding, you remove the lower plugs and turn the engine over till it clears....replace the plugs.

This is a single turbo T-66 with a street port job. Ran great all the time till now.

Jim

While compression testing a cold engine doesn't produce "exact" results.... If you are only seeing 45 PSI and you did the test properly, your engine is damaged.

http://www.rotaryresurrection.com/3r...ion_check.html

{Edit: I can't spell}

ok this is how I tested it. the first pulse was 15, the second 25 aand the third was 45 on both rotors. Is it just the Apex seals or could there be more issues? Like what?

Thanx,

Jim

You did have the gas pedal floored to open up the throttle plates?

If you are indeed getting compression results that low, you may as well just pull the motor now. As far as what all is wrong, you won't really know unless you crack open the motor.

Yes the accelerator was on the floor during the test. I guess I got some problems, I was running about 12.5 lbs of boost and it was smoking more than unsual at the end of the second day on start-up when it did catch.

Jim

My recommendation is to do the compression test one more time. Make sure your battery is completely charged for the test, then you can verify or disprove your original results.