Compression Question
#1
Compression Question
Hi...
Will the following compression numbers (done with wide open throttle while cranking the engine) cause an engine not to start?
1) cylinder #1 has 100psi of compression
2) cylinder #2 has 100psi of compression
3) cylinder #3 has 130psi of compression
4) cylinder #4 has 80psi of compression
It's from a D15B7 engine. Thanks.
Will the following compression numbers (done with wide open throttle while cranking the engine) cause an engine not to start?
1) cylinder #1 has 100psi of compression
2) cylinder #2 has 100psi of compression
3) cylinder #3 has 130psi of compression
4) cylinder #4 has 80psi of compression
It's from a D15B7 engine. Thanks.
#8
no it won't start with that compression, but it should TRY to fire. as in you should get the typical cough cough cough of combustion. like when a lawnmower doesn't start on the first try lol
#9
You've been trying to start a dead engine for 2 months, with no luck. There's no oil left on the cylinder walls for the rings to seal to. Try a wet test: Add 3 or 4 drops of oil into each combustion chamber before you test. Compression will go up. If not, get a leakdown test to see where you're losing compression.
#10
I added a few drops of oil in each combustion chamber and here are the compression test results:
1) cylinder #1 has 150psi of compression
2) cylinder #2 has 150psi of compression
3) cylinder #3 has 140psi of compression
4) cylinder #4 has 130psi of compression
So it seems that the compression looks ok? However, the engine will still not start. Can any one please help? FYI, I'm getting strong sparks from each of the 4 spark plugs (sparks jumped a 1/2" gap), and I'm getting fuel in the combustion chamber. The engine did try to cough for 1 to 2 seconds after I've dried up the spark plugs - they were covered with fuel. After the 1 to 2 seconds coughing, the engine won't even cough - just crank, crank, crank. I've tested the ECU, main relay, fuel pump and they are all working properly. The battery is fully charged.
1) cylinder #1 has 150psi of compression
2) cylinder #2 has 150psi of compression
3) cylinder #3 has 140psi of compression
4) cylinder #4 has 130psi of compression
So it seems that the compression looks ok? However, the engine will still not start. Can any one please help? FYI, I'm getting strong sparks from each of the 4 spark plugs (sparks jumped a 1/2" gap), and I'm getting fuel in the combustion chamber. The engine did try to cough for 1 to 2 seconds after I've dried up the spark plugs - they were covered with fuel. After the 1 to 2 seconds coughing, the engine won't even cough - just crank, crank, crank. I've tested the ECU, main relay, fuel pump and they are all working properly. The battery is fully charged.
#13
Originally posted by 95 R-81 Cx
Fuel seems like its your problem, check your FPR. If the fuel pressure is fine then you may want to think about piston rings.
Fuel seems like its your problem, check your FPR. If the fuel pressure is fine then you may want to think about piston rings.
good call there buddy
i would replace the motor. What is it? a b7? those things are a dime a dozen
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