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EFV-8 Club Forum / General Ford Discussion / 1937 starting backfire

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Posted By Discussion Topic: 1937 starting backfire -- page: 1 2     mzahorik 10-03-2018 @ 8:53 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 If you don't ask questions, you will never know. When you pull the choke out the mixture will become richer. I think what is happening is with a lean mixture, the burn time is much shorter and the flame will burn while the intake is still open. With a richer mixture, the flame time is retarded and the intake valve has more time to close before the flame front reaches the intake valve area. This is my thoughts anyone else is welcome to chime in and correct me if needed. Thanks Mike paulb@remax.net 10-02-2018 @ 1:40 PM reply profile send p.m. Member Posts: 42 Joined: Jul 2018 Sorry for the ignorant question, but I thought pulling the choke out cut off the air supply thus making the gas mixture leaner or richer. Sounds like it works, but seems to be the opposite of what logic suggests. mzahorik 09-06-2018 @ 7:44 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Tom ,there are three places that there can be some of this sloop. 1st between the rotor and the shaft, 2nd between the shaft and the cam adapter and then between the adapter and the cam. I have an older distributor on a newer engine. Somewhere along the line, the car got a short block, a 59A. The older attachments were retained. I don't think that I can remove the amount of sloop that exists here. If there is 0.030" sloop divided between these three spots. Next time I have the distributor out I'll check to see if I have a better shaft. Thanks for the help, I appreciate the insight. I found a belt at Tractor Supply and it was only $17. Mike TomO 09-06-2018 @ 6:49 AM reply profile send p.m. Senior Posts: 7385 Joined: Oct 2009 Mike, any rotational movement in the rotor with the engine stopped, will affect engine timing. If you continue to have the backfire, have the distributor serviced by a competent shop. Tom mzahorik 09-05-2018 @ 7:16 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Last night while driving the car, the fan belt was torn up. Today i have to find a replacement. Mike mzahorik 09-04-2018 @ 12:50 PM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Well..... it finally stopped raining and apparently we are not to get anymore for a couple days. I can't remember such a wet August/Sept in my 70 or so years. The compressed air found two significant exhaust leaks. I bought some Permatex exhaust sealer and pasted up the holes. Seems to work. It should hold until I can afford a new exhaust system. My old system seems to have been a cobbled system, but is still in good enough shape to last for a few years. I also checked the sloop in the rotor. There is some, but not 1/16", maybe 0.020" or so. Anyway it's too hot to do more today. Mike mzahorik 09-03-2018 @ 8:41 AM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Today I started to look for the exhaust leak. But the big problem is that it's HOT! So, after the parts cooled off, I made an adapter that connected my air compressor to the tail pipe. I throttled down the pressure and turned it on. I was surprised that the exhaust manifolds and manifold to pipe seems to be fine. The big leak is at the back side of the muffler. I think I can get those parts apart in seal it up. Then I'll apply the compressed air again and re check the more down stream connections again. GEeezzzz, now it's raining again. Mike carcrazy 09-01-2018 @ 7:01 PM reply profile send p.m. Senior Posts: 1979 Joined: Oct 2009 Use the original type of spark plug wires which feature the solid metal core wires. These wires won't lose conductivity due to heat or age. They are readily available from MAC's and many other vendors at reasonable prices. mzahorik 09-01-2018 @ 1:08 PM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 Started to look around for new spark plug wires. First my old ones are not original type. They are the more modern rubber insulation with a 90° rubber boot on the plug end. Looking at the vendors they have what looks like cloth covered wire with bare ends. I'm not looking for appearance, but want functionality. I'm thinking that the new more modern ignition wire would be better. Any opinions? Mike mzahorik 09-01-2018 @ 12:52 PM reply profile send p.m. Member Posts: 209 Joined: Nov 2009 OK, I recheck it. Could be when you are not looking for something you can miss it. The next item to change will the spark plug wires, to see if that changes anything. I have been trying to drive the car everyday. Today when I thought that the engine was warm and would not need the choke, I didn't use it and there was a mild backfire. Maybe it is more than just the choke. Mike

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