Model A Engine

JJASON

JJASON

Senior Member
Hello,I have a 28 Model A engine that's been rebuilt.Do engines of these normally puff a little lite blue smoke,when ideling? I know they do not have model type valve stem seals
 
No engine is supposed to puff white,blue, or black smoke. If they do it's burning coolant, oil , or rich gas. Well I shouldn't say no engine. Some engines puff colored smoke but typically no. Our flatheads should burn clean exhaust.
 
No they should not smoke.... If the old motor had an oil consumption issue maybe your muffler has oil in it... When the muffler gets hot enough it will cause blue smoke out the tail pipe... Just a thought.. Had this happen a few times
 
Jason, After reading a article in the Model A Restorer magazine 30 years ago I added a elbo and rubber pipe from the housing on my air filter intake to the valve cover to pull vapors that may rise from the hot oil and it works quite well. Not exactly a modern day PCV set up but adequate and not a substitute for a proper running engine. If you have any visible smoke coming from your Model A engine something is not correct and needs to be repaired or adjusted.
 
If the engine was just rebuilt, like no miles on it, it might smoke alittle as the rings seat in. This will stop after some miles are on the engine.
 
If the engine has been sitting for awhile, you could have a stuck oil control ring. Add a quart of ATF to a tank of gas and you may be able to loosen it up.
 
Noticed some "white" smoke fluffing from the exhaust pipe after dumping in a some "Marvel Mystery Oil". It cleared up within a minute or so.
 
Someone mentioned it "may" be caused by previous deposits in the muffler. I remember numerous cars in the past, that wouldn't pass the smog test, because of HIGH Hydrocarbon readings. Put on a NEW muffler & they passed!
Bill W.
 
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