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Post Info TOPIC: 434 Chevy Small Block oil pressure problem


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434 Chevy Small Block oil pressure problem
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Hey guys, my Dad built a 434 over the winter, and every since we put the engine in the car, we have been having oil pressure problems. At the first start up oil pressure was fine 60-70 cold ( Has a Mellings M-55 pump in it). So we had to install a Canton 6 quart pan because we are running a 6" rod now, and he drives the car on the street and cruising at 3,200rpm the oil pressure is 50-60 lbs. and if he lays into the throttle it will drop to 40 and just stay there.

We did going racing with it, and as he goes down the track at about the 1/8th mile marl he has 40lbs, and at the finish line he has 20-25lbs. but as soon as he lifts off of the throttle it bounces right back up to 50lbs. We are running 6 quarts in the pan, no windage tray, and the pans as the trap doors in it. Does anyone have any ideas what may cause the lost of oil pressure?

Sorry this is long just looking for some info.

Thanks,
Craig

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BDJ406

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maybe the oil pickup is broke or cracked i had a big block that had good oil preasure at idle but when on the gas it would go to 0 but when you let off the gas the preasure would be back to normal we took the pan down and the pick up was broke off and laying in the pan just something to think about or check kinda a pain in the ass to get the pan off in the car

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BDJ406

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Or call jeremy at creb im sure bob will have an answere for you

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ZOHAN

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i think the oil pump ended up being cracked some how. part failure.

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i had this issue with a 422 sbc that i had before. on the highway cruising it would be around 55 - 60 psi and once i jumped on it the pressure would fall. i never stayed into it too long to see how low it would go but i did notice that the oil temp would also spike over 260 degrees. some of you may know smarty with his 70 cutlass conv. with the 4906 bbc, his does the same thing. he has tried a few different oil pumps including a titan unit or similar, tore the engine back down and had his machinst look at it and have found nothing wrong. he has tried more oil, less oil, different oils, disconnected his crank case evac and it still does it. i never found out what was with my small block since i ended up doing the bbc anyway. as for oil temp causing it my bbc was 2 quarts over full due to milidons web site info and was running 250 - 260 on the highway but when i did jump on it at those temps it would climb up to 60 psi, never dropped. don't know if it was a block issueas my sbc and smarty's bbc were/are factory and my bbc is a dart block but no one has come up with an answer. keep us posted please.

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ZOHAN

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i confirmed the problem n it was definetly a part failure. melling had a 6month run of faulty oil pumps. they lightened up the casting to save $$ . if you have any pics of the pump in your motor jeremy (creb)can look at it n let you know if its 1 in the faulty run from melling. all im saying is that was the problem in this case thats all.



-- Edited by RATZ28 on Monday 6th of September 2010 11:48:22 AM

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i remember reading about their faulty pumps, thats why there is an elgin in my motor.

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