Compression Test with Carburetor Removed d

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Nov 25, 2016 | 11:53 AM

daveengelson

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From: Boulder Creek, Ca

Compression Test with Carburetor Removed d

Compression test: Remove spark plugs, and prop open choke plate:

I can not imagine how testing compression, with the carburetor removed, would influence the readings, thought it best to check with knowledgeable members to confirm?

Advice, Comments Appreciated!

Nov 25, 2016 | 12:10 PM

69cj

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From: Middle Tn.

I don't see where it would make a difference.

Nov 25, 2016 | 12:44 PM

daveengelson

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From: Boulder Creek, Ca

Quote:

Originally Posted by 69cj

I don't see where it would make a difference.

Agree, appreciated the confirmation!

Nov 25, 2016 | 03:24 PM

hiball3985

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From: tujunga, calif

With the carb on you need to open the choke and throttle plates, without a carb would be ideal.

Nov 25, 2016 | 04:27 PM

daveengelson

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From: Boulder Creek, Ca

Quote:

Originally Posted by hiball3985

With the carb on you need to open the choke and throttle plates, without a carb would be ideal.

Jim, thank you, another confirmation, intend checking tomorrow rain or shine. The truck had sat for several years, comparing the readings taken couple months ago where a couple cylinders where just within limits; hopefully, with some mileage the readings on those cylinders will have improved??

Nov 26, 2016 | 02:55 PM

Hypoid

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From: Golden, CO

Quote:

Originally Posted by daveengelson

All other things being the same, yes, that is possible. If no improvement, remember to do a dry, and then a wet test.

Nov 26, 2016 | 03:49 PM

daveengelson

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Quote:

Originally Posted by Hypoid

All other things being the same, yes, that is possible. If no improvement, remember to do a dry, and then a wet test.

I do not recall reading where one continues cranking until gauge reaches optimum value; if the case, all running 135 except for #2 at 150, previous reading the values on #7 and #8 were low. Yet again stored my engine rebuild book in the attic and too lazy to fetch the ladder; I believe the readings are within limits?

Do appreciated U all's input, very helpful!!