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#1 |
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OK, new block and pump. Same pan? Oil clearances strike me as a bit loose for aluminum rods. Is the oil getting too hot? Does the pressure gradually go down or does it just drop at a certain point or RPM? The pump should be more than sufficient.
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Phil Molski PMR Performance S/C 1623 |
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#2 |
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Is it the same distributor?
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#3 | |
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Join Date: Jun 2011
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I made 2 runs today and the engine's coming out. The vac pump issues has been mentioned by several others on Speed Talk. That's something I didn't give any thought to as my understanding is that high vac starts showing issues with wrist pins........I never see that. I did change to a larger pulley and vac is about 5-6" at idle and I believe 10-12 throught the lights...............but I can't confirm that. I've never noticed it being too high but then I dont look at the vac gage during a run either. |
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#4 |
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Is an accumulator a solution.
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#5 | |
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How much end play in your oil pump? I never run more than .001" end play on my pump impellers. If I open up a new pump and find more than that (often do) I lap the end of the pump housing until I get it there. Done that for years with zero issues. What weight oil are you using?
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Ed Wright 4156 SS/JA |
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#6 |
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Is the plug installed in the block, under the rear main cap , that sends oil to the filter ? If missing it will bypass the filter, and may cause contaminated oil to ruin the bearings . Don't know if the Dart blocks are machined like a production Chevy block, but when I bought a couple of factory blocks that plug was missing .
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#7 |
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Just curious, how much oil are you running and what oil pan (part number and manufacturer) are you using?
I'm leaning toward aeration. |
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#8 |
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The pan is an older Moroso Ultimate 2..........steel pan . they stopped producing them in the early to mid ninties?
The oil is a 30 weight Brad Penn breakin oil as of right now. Maybe a vac pump issue.......... The oil clearances are what the rod manufacturer ( GRP ) suggests.......who am I to argue? I could certainly look at that though........why aluminum? Because that was better suited to what I'm doing IMO. 6 quarts plus filter total as of now. Have run 5 plus filter..........same result. I think a wet sump is a PITA right now. Last edited by joespanova; 03-21-2016 at 06:40 AM. |
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#9 |
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It may be your hurting the motor after the finish line? I run a 3qt. accusump on my bracket stuff after a few rod failures. Never had a problem since.
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#10 | |
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Aluminum rods have a very short cycle life compared to a good steel rod. There is a lot of mass swinging around there which does not help windage issues. Sounds like a windage issue!! How much vacuum are you pulling. If your using cam bearing with 3 holes there is a serious bleed off issues along with you don't have a clue what your lifter bore clearance is which could be bleeding off to much oil and dumping it on the crank. Go to dry sump problem solved!! |
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