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In this Discussion
- coolpete1 November 2008
- Oldcar_Mechanic November 2008
48 Dodge 218 cylinder pressure
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[object]I recently aquired a 1948 Dodge B-1-B Pilothouse in very good cosmetic condition. It has only one small dent, and very little rust. The odometer shows about 53,000 miles. I traded a straight, clean, 1972, 1 ton, crew cab Ford, with a puffed motor, that I paid $250 for, even up. I think personally that it was the deal of the century. It's been sitting for 15 or more years. Before I even tried to start it, I replaced the points, condenser, rotor,cap, coil, plugs, and plug wires. When I tried to start it, it acted like it wanted to start so bad, but wouldn't. I know flatheads are famous for sticky valves, so I decided to do a compression test. Pressures are as follows- #1=45, #2=35, #3=40, #4=35, #5=40, and #6=50. According to the block numbers this is a 218 c.i. engine. These pressures seem pretty low to me. I know this is not a high compression engine, but although I am 55 years old and have done a fair amount of wrenching in my life, this is the first flathead I ever compression tested. I squirted a little Marvel Mystery Oil in each cylinder and turned it over a few times in hopes of lubing a sticky valve. I will test it again in a day or so, but would like to know what the pressures should be. Any knowledge would be appreciated.
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i just had the same problem with my 53 pontiac's flatty , 40 psi in each hole but it needs around 80 to run . I actually just came in from tearing it down and all the cyl. walls were glazed up and some of the rings were stuck to the pistons . i'd try a can of combustion chamber cleaner sprayed down the plug holes and leave it sit for a night ,if the compression doesn't come up after that you'll probably have to tear it down.
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If you put a little oil in each cylinder and re-test the compression, see what the readings are then. If it comes up considerably then you know that it's the rings that are allowing the pressure to excape and not the valves.
Do each cylinder one at a time, first without the oil and then with.
What condition is the carb in?
Ron