Compression

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07-31-2003, 02:55 PM

an_juan

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the compression on my front and rear rotors are 75 and 30 psi , respectively at 200 rpm (sea level). Sould be engine be able to start? Thanks.

08-01-2003, 06:56 AM

toddp31

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I am not sure the minimum to start but pull start it. If it doesn't start doing that then most likely it will not.

08-01-2003, 10:13 AM

andynogo

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Location: Perth, Western Australia

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Difficult to say, but probably not.

As toddp31 sez, towing is the best way to tell (that will usually start a marginally low comp motor).

I would be most concerned about the difference in pressure between the two...

08-01-2003, 11:06 AM

an_juan

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well the engine is already out of the car.....just second guessing myself. THanks though.

08-02-2003, 11:15 PM

Heath

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Location: Asheville, NC

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Dump a few ounces of ATF in there before you try to start it. The oil will help the seals do their job a little better and hold compression.

08-03-2003, 01:53 AM

jspecracer7

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why only 2 numbers for compression? there are 3 sides to each rotor, so you should have 6 numbers for compression.

08-03-2003, 01:42 PM

Mazderati

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Six numbers if one uses a rotary compression tester. Two numbers with a regular compression tester. Three rotors are nine and three.

08-03-2003, 02:23 PM

Silver Ninety Three

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Location: Clifton, NJ

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Got a car in the shop right now that is all stock with like 90k on the original motors. Compression is about 5 on the rear rotor, and 4.5 on the front. Suprisingly it still starts.

08-03-2003, 03:38 PM

Street King

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Quote:

Originally Posted by Silver Ninety Three' date='Aug 3 2003, 11:23 AM

Got a car in the shop right now that is all stock with like 90k on the original motors. Compression is about 5 on the rear rotor, and 4.5 on the front. Suprisingly it still starts.

Holy shiznit, that is one tired engine.