460 oil pressure problem
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460 oil pressure problem
I recently rebuilt my 460. the machine shop built the bottom end for me and i did the rest. i installed a high volume oil pump from ford racing and a windage tray from milodon. when the engines cold i have 70psi oil pressure. once it gets hot i only have around 50psi at 2500rpm and thats about as high as it will go. at idle it drops off to around 20 psi. i worry about this because the engine is in a mud truck and its got a pretty decent cam and valve train and i rpm it pretty good. i also have a 800cfm carb on it and i know its too big im waiting on a smaller carb to come in. is there anything i could check before i pull the engine out and start tearing it down to check the bearing tolerencers
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Personally I don't think there is anything wrong with that. Not knowing anything about the shop that built the botom end, did they align hone the mains ? Did they resize the rods ? Was anything done to the crank ? Balanced ? Did they clearance the bearings with a dial bore gauge & mics ? Some things I'd wonder about if the oil psi changes in the near future.
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The engine was ballanced, the crank was ground I belive, the shop I used is a very reputable shop that my father has used for 30 years with no problems. It just worries me if I spin the engine to 6000rpm with only 50psi oil pressure.
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From: wyoming
Many questions?
On the carb its not to small! I think you might need bigger possibly. Need more info on engine. what type of carb? On the oil system need to know the bearing clearance on mains/rods. If you don't know this can't answer any questions. On the oil pump need to make sure your hi volume pump isn't pulling your pick up tube to btm of pan. what is your pickup tube to oil pan clearance. these things matter and you need to know. Sometimes the oilpump pick up support bracket can break and flex and get sucked down to oil pan and starve the pump for oil or crack the metal tube to oil pump. Or if bolted to oil pump instead of screwed in can crack tube possibly. many variations than can happen with hi volume pump. what is your oil pump impellar clearance to btm plate internal. things to check in lube system. in mud truck world and drag racing things happen quick and violent and expensive. hope this helps. Are you running a rear sump oil pan or something else.
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The carb is too big, 800cfm edlebrock, pulled plugs its way way rich so I know the carbs too big. Not sure the tolerences I didint do the work myself. Stock truck rear sump pan not sure cleanances. If the tube was broke or flexing sucking into the bottom of the pan it would do that when the engine was cold at high rpm just as easily as it does when its hot. Even at idle when hot the pressure is low, I'm not convinced that the pickup is being sucked to the pan.
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From: wyoming
jet the carb.
The carb is too big, 800cfm edlebrock, pulled plugs its way way rich so I know the carbs too big. Not sure the tolerences I didint do the work myself. Stock truck rear sump pan not sure cleanances. If the tube was broke or flexing sucking into the bottom of the pan it would do that when the engine was cold at high rpm just as easily as it does when its hot. Even at idle when hot the pressure is low, I'm not convinced that the pickup is being sucked to the pan.
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From: wyoming
carb stuff!
edelbrock 800 isn't to big on a 460. Plus you need to get a metering kit to set up properly on air/fuel, call edelbrock! Could be a air bleed situation also. many other issues you need to get it dialed in properly. Clearance situation I guess with engine. If your gonna race your gonna have to learn how to do a lot of this stuff yourself or find the right machinist that is familiar with racing and correct these little issues. good luck.
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I forgot to mention that this truck isn't a race truck, its a street/mudder, I found a formula somewhere on this site for carb sizing that went cubic inches x rpm x ve(mildly modified=.85) / 3456=cfm in my case I ended up with 750. I plan to swap to the 750 and run for a bit and see how the plugs look. My other thinking was maybe the massive amounts of unburnt fuel was thinning my oil out causing low pressure. I'm going to swap carbs and change oil and see if I get any change before I pull the mill out of my truck. I really hope its not a clearance issue on the bottom end because the shop I used has a good reputation and I'd hate for it to be somthing that serious. And I didn't really plan on spending the money doing it again. Thanks for the help ill let you know what I find
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From: wyoming
carb stuff!
Go to pro systems site on carbs. some really good info to check out. never enough info these days. Also wallace racing is a good site to get some calculators to play with. On the carbs prosystems uses a little different calculation for figuring cfm and these guys know some crazy stuff in carb world. keepin old iron alive one ford at a time. pro system has a good tech info on carbs and will open up yours eyes a little on some potential to be had. After running some higher end carbs I will never look back to regular carbs. also quick fuel builds some nice carbs also really happy with their products.
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