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Old 07-31-2008, 12:57 PM
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serious motor question

i recently built a 350 bored 60 with brand new rings pistons crank everything and its been about 350 miles into the break in. i have dirt track type valve covers with two vent tubes on one side and recently they start to smoke after its warmed up and idling but going down the road i dont notice it and before its warmed up it doesnt do it, they also have some oil comin out. i havent ran it hard at all and im not sure what it could be. What could be causing this. if it helps i kno its not running hot it has a 160 degree thermostat wich keeps it at about 130 once finally warmed up

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Old 07-31-2008, 01:05 PM
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Originally Posted by Casperdude898
i recently built a 350 bored 60 with brand new rings pistons crank everything and its been about 350 miles into the break in. i have dirt track type valve covers with two vent tubes on one side and recently they start to smoke after its warmed up and idling but going down the road i dont notice it and before its warmed up it doesnt do it, they also have some oil comin out. i havent ran it hard at all and im not sure what it could be. What could be causing this. if it helps i kno its not running hot it has a 160 degree thermostat wich keeps it at about 130 once finally warmed up
It's actually pretty normal. Just crankcase gases/oil fumes. May have a little blowby from the rings. You could put a PCV valve in the opposite valve cover to draw the gases into the intake manifold. This will pull fresh air into the 2 vent filters instead of allowing them to vent outward.
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Old 07-31-2008, 01:10 PM
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should it die down a little once the motor is fully broken in ? or is this something im gna have to deal with untill i get a pcv
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Old 07-31-2008, 01:28 PM
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change the valve covers.why are you running them anyway there for stockcars.run p.c.v. setup and don't worry,no more smoke and smell of oil.
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Old 07-31-2008, 02:13 PM
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Originally Posted by Casperdude898
should it die down a little once the motor is fully broken in ? or is this something im gna have to deal with untill i get a pcv
The vapors may decrease some after breakin/ring seating. But you'll always have some crankcase pressure and an oily engine. Get some more valve covers or cap 1 vent/filter off and install a PCV valve & hose on the other valve cover to intake or carb baseplate full time vacuum port. You may have to cut a hole if the other cover doesn't have 1. Most parts stores have the rubber grommets & PCV valves.
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Old 07-31-2008, 02:51 PM
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Just stick a pcv valve in one of the tubes. It should fix your problem.
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Old 08-01-2008, 08:35 AM
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First change that thermostat to a 195.Running at 130 degrees you are fuel washing the cylinders and killing the rings.A lot of what you see is from unburnt fuel and diluted oil.Temp needs to be kept close to 200 degrees as the oil must hit 212 to boil out the moisture that naturaly occurs.A pcv valve would be a very good idea. Other wise you will need to change oil often as the pcv is there to burn combustion byproducts instead of allowing them to build up in the oil.
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Old 08-01-2008, 10:41 AM
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that actually makes sense it started doin this around the time i changed the thermostat to the 160 from a 195 so i guess ill put the old one back in
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Old 08-01-2008, 12:14 PM
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Casperdude, it ALL makes sense. The thermostat should be changed, I agree. But, since you apparently don't have a road draft tube (like engines until the early sixties did) the only way for combustion by-products that get to the crankcase to vent themselves is through the two tall vent pipes on one of your valve covers. It's gotta go somewhere or the pressure will just build until the vent filters get blown off. The way to solve the problem is with a PCV system. It won't hurt anything, only cause your engine to pull fresh air into the crankcase thru the vent filters, instead of pushing by-products out of the vent filters.

Pat
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Old 08-02-2008, 01:58 PM
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alright well thanks a lot guys yall helped me answer my question
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