540 Issues
#31
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i can understand the question about the reliefs at the oil holes but i have seen that work 8 ways from sunday on 50 different motors and i have never seen it as an issue... and realistically why would it be ? all it does is reduce the surface area a bit right there but in the real world, if the cleareances are correct and the pressure is correct then the bearing doesn't even notice there is a low spot there because it is hydraulically solid. i have seen ford V-8s with a fully radius grove there run 24 hrs at 7500 rpm and the bearings come out perfect. so in a word , no... i don't think the oil reliefs are an issue. and if gellner built those motors, he is clearly a knowledgeable guy and wouldn't do something fundementally wrong . i still say that you need to check the clearences mechanically with a dial bore gage and micrometer. get some real answers and data and then call us back.
#33
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Seeing the cam and lifters it looks like there was a lack of a proper lubrication boundary/layer of oil, like the oil got real hot or pressure/flow at the actual mains/rods and cams was inadequate. As far as the oil reliefs, they look goofy, I wouldn't have ground them that way but its possible your engine builder has done it that way for years on other engines and it has worked. There wasn't a sale on recycled/reclaimed oil at advance auto was there??? (just kidding). I built a aluminum rodded motor for a jet boat I used to have years ago with no oil cooler and when my oil pressure dropped to 3 psi hot at idle and 20 lbs at wot brecause of the con rods growing from heat (didn't know that at the time I did it)my bearings and crank looked similar or worse in 20 hours, yours looks simila. What kind of oil pressure did you have hot at idle?? did you have a oil temp gauge, I would think your oil was 300+ degreees and not able to hardly carry any pressure hot if I was guessing.
Last edited by articfriends; 02-21-2012 at 03:34 PM.
#36
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#37
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Seeing the cam and lifters it looks like there was a lack of a proper lubrication boundary/layer of oil, like the oil got real hot or pressure/flow at the actual mains/rods and cams was inadequate. As far as the oil reliefs, they look goofy, I wouldn't have ground them that way but its possible your engine builder has done it that way for years on other engines and it has worked. There wasn't a sale on recycled/reclaimed oil at advance auto was there??? (just kidding). I built a aluminum rodded motor for a jet boat I used to have years ago with no oil cooler and when my oil pressure dropped to 3 psi hot at idle and 20 lbs at wot brecause of the con rods growing from heat (didn't know that at the time I did it)my bearings and crank looked similar or worse in 20 hours, yours looks simila. What kind of oil pressure did you have hot at idle?? did you have a oil temp gauge, I would think your oil was 300+ degreees and not able to hardly carry any pressure hot if I was guessing.
#39
My bookie quit the engine building business, and since I lost my glasses I can't see if there was some sort of contaminant that may have caused the oil to break down.