| doning | -- 07-15-2010 @ 7:17 AM |
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My '37 Ford is almost ready to get on the road hopefully late summer. My Dad and I were going back and forth about the correct way to break-in the engine. He say's I need to push it outside and run it at 2000 RPM for a half hour. I told him the correct way is to just drive it varying the MPH while driving putting some load on the cylinder walls. Who right???
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| 1932BB | -- 07-15-2010 @ 7:43 AM |
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Hey, do both! Keep Dad happy! Running at at high idle (maybe 2000 is a little steep) will be easy on the bearings and your method will help seat the rings. Congratulations and have fun!
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| 37RAGTOPMAN | -- 07-15-2010 @ 8:05 AM |
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If you run it outside, use a fan to keep it cool,this is most important that it does not overheat,even on the road, drive it when it is cooler outside.like at dusk. before dark, just do not run at on constant speed,for long periods of time,and make sure you carry water with you,and make sure it is full at operating temperature.not cold otherwise it will spill the coolant out when it gets to operating temp. that valve that SKIP SELLS is a GOOD INVESTMENT,for keeping the coolant in the radiator. I just drove my 37 breaking it in on back roads,,that was in 1979. KEEP ON TRUCKIN 37 RAGTOPMAN
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| doning | -- 07-15-2010 @ 9:01 AM |
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What kind of valve is it that Skip sells?
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| supereal | -- 07-15-2010 @ 9:49 AM |
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Skip sells a check valve that attaches to the overflow tube. In effect, it creates a pressure in a non-pressurized system that can't use a pressure cap. As for break in, it is important to vary the engine speed and load to allow variance in the amount of oil reaching critical places, such as the bearing sh*lls in the rods and mains. Drive the car at various speeds, and avoid long periods of idling. Watch the temperature carefully, as many rebuilds are set up too tight. Most will eventually get past that stage, but if the engine heats, allow it to cool before proceeding.
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| TomO | -- 07-15-2010 @ 9:54 AM |
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Skip sells a pressure relief valve that allows the cooling system to develop 3 lbs pressure. This keeps the coolant from foaming out of the overflow tube. I would not run a newly rebuilt engine at 2000 RPM for a half hour. I would use the driving method and make sure that each trip was at least 30 minutes long until the first 500 miles was put on the engine. The 30 minute time frame is to allow all of the engine to reach normal operating temperatures. Tom
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| FrankM-RG5 | -- 07-15-2010 @ 10:37 AM |
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Check out step 7 from Cranes website for breaking in a new cam. http://cranecams.com/pdf/548e.pdf If it is just rings and bearings the varying speeds will be ok. Some say not to let it idle too much as it will glaze the cylinder walls because there is not enough pressure on the rings
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