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Discussion in 'Gas Engines/Drives/Transmissions/Props' started by SrtThis, Aug 2, 2019.
A qt. an hour at 3800 is excessive for sure, but if it runs good, oil is cheap and it is summer.
honestly thats kinda where i am with it at this point, i'll worry about it more once i pull the heads off to get the tops ends done.
I'd be more inclined to think it's your 20 year old rings.
could be for sure. more than likely i'll just pull the motor and go over the entire thing when it comes that time. my motor builder has 2 motors for my race car currently so it will be after those are done lol
My Crusader 454s were rebuilt 4 years ago with new cast pistons (.010 over), bearings, lifters, valves, mild performance camshaft, rockers and Melling oil pump. They now have about 180 hours and they have yet to consume oil. I'm a bit surprised at the oil consumption numbers being quoted here.
Good engines, but completely different brand...
updates... well... kinda
ran out the rest of the season... STILL no idea where the oil is going.
My 1998 7.4 MPI went 105 hours last season and didn't even use 1 full quart of oil. She's got almost 800 hours on the motor and I cruise around 4000r's.
FWIW, I use Brad Penn high zinc racing oil
with the same use of oil the entire season ?
Out the tailpipe. It's not in the bilge and you replaced the oil cooler right ? Thought you were gonna rering this thing after your machine shop finished building your race engines.
My bet it’s all blow-by. If cruise is 70% of WOT then you should be closer to 3200-3300 rpm on 7.4?
I had 7.4 mercruiser w visible blow-by when pulling oil cap but it didn’t consume anywhere near what your getting.
Don’t know if my info will help, but...I bought a used 1995 Dodge p/u with the 318 years ago. Drove it normal for a few weeks no problem. No leaks. No smoke. No oil consumption. Towed my 4500 lb boat about 100 miles and my oil light came on. Fast forward a few weeks: the Oil Pan Gasket had blown out. It lies between the intake manifold and block. Under a load, the increased vacuum sucked oil directly from the pan and blew it out the exhaust. Normal driving did not create enough vacuum. The oil did not burn. No engine drips. It went right out the exhaust pipe. $1 gasket took a removal of the intake to fix. I am not sure if that engine is anything like yours. If you pulled an exhaust manifold and studied the inside of the exhaust, you may find clean oil.