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11-14-2021, 10:49 AM | #1 |
Junior Member
Join Date: Oct 2020
Location: Southern Illinois....NOT Chicago!
Posts: 26
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Compression results
So after finally concurring carburetor issues, I moved onto general maintenance and some base line readings for reference in the future. First on the list was a compression test which was taken after about a 10 mile drive.
Cylinder/Dry/Wet. Cylinder/Dry/Wet 5/110/110. 1/75/75 6/110/115. 2/85/90 7/105/115. 3/90/95 8/105/120. 4/105/110 I added 2 squirts of MMO to each cylinder for the wet test before having one of the kids crank it over 5 compression strokes. Cylinders 1/2/3 were a suprise for me since the car runs good and really doesn’t smoke out the exhaust. From what I have read those low numbers could be valve related since the numbers didn’t come up with the wet test. There is some valve train chatter that I’m assuming is related. Other than a leak down test, is there anything else I should try? I did add MMO to the oil before I ran the car and gonna try and drive it a bit more before bad weather to try and hopefully loosen up things. Thanks again guys for all you knowledge. |
11-14-2021, 11:24 AM | #2 |
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Join Date: Jan 2014
Location: Orcas Island Washington
Posts: 4,846
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Re: Compression results
How long did this engine sit idle in storage? Stored indoors or out? There is a lot of difference between being worn out and being gummed up. I dragged a vehicle out of the damp and soggy NW Washington woods last year that had made a few short runs over the past 20 years. Not a ford it was an OHV six. I added mmo and seafoam to the fresh oil and also to the new gas. I also added these chemicals down the carb throat at fast idle, which gave some instant improvements. Drove it hard for the summer and the compression increased dramatically. The vacuum guage went from 16 and bumpy to a solid 20 and steady. Front to rear, the compression was increased by these numbers. 23,19,23,35,33,26 over the course of 3 months and about 1200 miles. I was very happy with the results. Worth a try.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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11-14-2021, 11:48 AM | #3 |
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Join Date: Sep 2020
Location: Mount Desert, Maine
Posts: 504
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Re: Compression results
My ‘36 Phaeton is a level 90 (dry) on all cylinders; consistency reassures in the absence of higher numbers
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11-14-2021, 12:05 PM | #4 |
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Join Date: Jan 2019
Location: Chicago
Posts: 711
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Re: Compression results
On my engine that had been in long storage, adding MMM to the oil did not help the sticky valve problem. But adding MMM to the gas eliminated the problem immediately.
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11-14-2021, 04:38 PM | #5 |
Junior Member
Join Date: Oct 2020
Location: Southern Illinois....NOT Chicago!
Posts: 26
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Re: Compression results
The car has not had many miles on it for several years. Grandpa would get it out occasionally but I would say less than 20 miles each year. This year I have put about 50 miles on the car do to lots of overtime, chasing kids all over and issues with the carburetor. I put a vacuum gauge on it and had about 20”, the needle would flutter less than 1”. I have seen where guys were putting MMO in the fuel, will look into that. Is that gonna foul the plugs?
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11-14-2021, 07:15 PM | #6 |
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Join Date: Oct 2017
Posts: 563
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Compression results
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11-14-2021, 07:44 PM | #7 | |
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Join Date: Jan 2021
Location: Slightly left of Vernon, BC
Posts: 155
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Re: Compression results
Quote:
Good luck with yours!
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1949 Ford F-47 with a '51 8BA Flatty, GM TBI fuel injection system, and a grey shop cat, Spot. |
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11-14-2021, 08:02 PM | #8 | |
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Join Date: Sep 2011
Location: Christchurch New Zealand
Posts: 1,603
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Re: Compression results
Quote:
The vacuum gauge with 20" at idle is good and if it were me I would continue to drive as is and attend to whatever comes along. If idles ok, carb and condenser and coil ok and it starts ans stops ok on the brakes thats good for me. Possible carb gaskets may have dried out with sitting. All the best. Phil NZ |
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11-14-2021, 09:48 PM | #9 | |
Senior Member
Join Date: Jan 2014
Location: Orcas Island Washington
Posts: 4,846
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Re: Compression results
Quote:
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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11-14-2021, 10:22 PM | #10 | |
Junior Member
Join Date: Oct 2020
Location: Southern Illinois....NOT Chicago!
Posts: 26
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Re: Compression results
B75EA8D1-7961-4996-B1A7-108248A7CA45.jpg
Quote:
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11-14-2021, 10:42 PM | #11 |
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,260
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Re: Compression results
That does seem a little high, although you can't really be sure with 70 plus year old original gauges. If it doesn't boil over, I wouldn't panic. It might be a good idea to get an infra-red remote thermometer and check out what's really happening. They are pretty cheap these days ($20-$30) and can be quite useful for many purposes. I determined that our oven was 35 degrees less than the set temperature, which had caused a few problems.
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11-15-2021, 12:19 AM | #12 |
Senior Member
Join Date: May 2010
Location: MN
Posts: 7,053
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Re: Compression results
Your cylinder compression is 100-110. Probably okay, haha. Guess you have good cylinder compression and high compression heads.
Get a infra-red remote thermometer as mentioned. Know what condition your condition is in. |
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