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compression test

Started by moparguy01, February 19, 2013, 06:46:54 PM

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moparguy01

February 19, 2013, 06:46:54 PM
This may seem like a dumb question. But I need to do a compression test on an engine. The problem is that its not in a car, and it does not have a transmission on it. I tried spinning it over by hand and just could not spin fast enough to get a good reading. Does anybody have any ideas? or is my best bet a leakdown test in place of it?

Dino

#1
February 20, 2013, 12:04:36 PM
Got a helper?  Stick an impact wrench , or power drill, with a socket on there instead of trying to spin it by hand. 
Extraordinary claims require extraordinary evidence.

John_Kunkel

#2
February 20, 2013, 05:28:36 PM

Without a starter attached you'll never spin it fast enough to get an honest reading and, besides, the engine should be warm for a good test.

The only other alternative is a leakdown tester.
Pardon me but my karma just ran over your dogma.

moparguy01

#3
February 21, 2013, 01:50:05 PM
Doc, I tried a impact and it didn't actually spin the engine over, and i did not want to keep going and risk the bolt breaking.

Thats what I was afraid of John. Not what I wanted to hear, but hey, At least i have a answer. Thanks.

Dino

#4
February 21, 2013, 02:00:56 PM
I figured it was worth a shot but alas it doesn't work. 

Oh well, all you have to do is quickly bolt up a transmission!   :icon_smile_big:
Extraordinary claims require extraordinary evidence.

six-tee-nine

#5
February 21, 2013, 02:20:46 PM
Or just a 4 speed bell housing with a starter
Greetings from Belgium, the beer country

NOS is nice, turbo's are neat, but when it comes to Mopars, there's no need to cheat...

moparguy01

#6
February 21, 2013, 09:53:29 PM
i did a leakdown test today. the worst hole was less than 8% and the best was 2% so it should be pretty good. considering the good range is from 10% down to 30%  :2thumbs:

firefighter3931

#7
February 23, 2013, 09:42:05 AM
Quote from: moparguy01 on February 21, 2013, 09:53:29 PM
i did a leakdown test today. the worst hole was less than 8% and the best was 2% so it should be pretty good. considering the good range is from 10% down to 30%  :2thumbs:


I'd be happy with those leakdown numbers Russ  :2thumbs:


Ron
68 Charger R/T "Black Pig" Street/Strip bruiser, 70 Charger R/T 440-6bbl Cruiser. Firecore ignition  authorized dealer ; contact me with your needs

71_Charger_R/T

#8
February 23, 2013, 09:55:48 AM
Quote from: moparguy01 on February 21, 2013, 01:50:05 PM
Doc, I tried a impact and it didn't actually spin the engine over, and i did not want to keep going and risk the bolt breaking.

Thats what I was afraid of John. Not what I wanted to hear, but hey, At least i have a answer. Thanks.

I was gonna say.... NO! DON"T USE AN IMPACT! That won't spin it. (only break it)  Looks like you got what you needed with the leakdown.

moparguy01

#9
February 23, 2013, 10:22:02 PM
I'm going out on a limb and sayings its good after seeing them Ron. Thanks for all your help guys
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