ThomasBorchers Posted March 3, 2015 Share Posted March 3, 2015 (edited) Hello,a friend owns a 1924 Model T. He always had problems with his engine. Now it seems, that he solved problems with the ignition, the car has a new carburetor, the gaskets to the manifolds are new and work correct.But... the spark plugs are ( except one ) very fast sooty. If we turn to more lean mixture, it starts to misfire. Engine runs very uneven at every carb setting. I have tested the compression. I have read that it should be between 50 and 70 PSI. But it has between 36 and 40. The engine got new pistons and rings a year ago, valves were lapped.So my question is, is this compression too low or should the engine run with this compression?I just have an idea... what will happen, if the oil level is much to high? I have seen, that oil bubbles were at one spark plug, as the engine run. Could come to much soot when the oil level is to high?Kind regardsThomas Edited March 3, 2015 by ThomasBorchers (see edit history) Link to comment Share on other sites More sharing options...
MochetVelo Posted March 5, 2015 Share Posted March 5, 2015 A T should run OK at 35 pounds compression. 50-55 pounds is ideal. Check this thread. May I suggest you post your question on this forum. You will receive many replies.Too much oil will cause dense exhaust smoke, and the oil will leak out the rear and many other places!Phil Link to comment Share on other sites More sharing options...
Guest Rp1967 Posted March 6, 2015 Share Posted March 6, 2015 (edited) A Edited March 6, 2015 by Rp1967 (see edit history) Link to comment Share on other sites More sharing options...
ThomasBorchers Posted March 6, 2015 Author Share Posted March 6, 2015 Hi Phil,ok, thank you for the hint. Today I am at the car and opened the upper oil cock. Since 3 hours I am waiting that oil dripping stops... Soon I have to change the small bucket under the oil cock, then it will be full with 1/4 gallon oil. It takes time since the oil is cold and SAE 40 Type. Under the transmission my friend installed an extra oil pan. In it is also a plenty of oil. I have to wait how much oil will finally come out and then start a new try.RegardsThomas Link to comment Share on other sites More sharing options...
MochetVelo Posted March 6, 2015 Share Posted March 6, 2015 Ford said the oil should be between the upper & lower petcocks, but most drivers keep the oil about level with the upper petcock (ie, some oil should drip out of the upper petcock). About 4 quarts (3.5 liters) is the capacity. Be sure your petcocks are not clogged.Phil Link to comment Share on other sites More sharing options...
ThomasBorchers Posted March 7, 2015 Author Share Posted March 7, 2015 There was 25% too much oil in it. Now the plugs are looking great after a test drive. But it is still the problem, that the engine runs at higher rpm not correct. Sometimes there is missing an ignition. I have to inspect the timer and rotor. I have set the coils already with the correct amps with a tester. Thomas Link to comment Share on other sites More sharing options...
ThomasBorchers Posted March 13, 2015 Author Share Posted March 13, 2015 The rotor had very much play, the nut was not tight. Now it runs much better. But will need a new set of rotor and cap.Thomas Link to comment Share on other sites More sharing options...
ThomasBorchers Posted April 17, 2015 Author Share Posted April 17, 2015 After changing cap and rotor, it runs really good.RegardsThomas Link to comment Share on other sites More sharing options...
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