Oil pump upgrade

DiscoWeb Message Board: Technical Discussions - Discovery: Oil pump upgrade
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Top of pagePrevious messageNext messageBottom of pageLink to this message   By Gabriel Guay (Gearhead) on Saturday, December 08, 2001 - 12:08 am: Edit

Factory buick oil pumps suck, so does the stock landy oil pump. Is there an upgrade kit? I used to upgrade big block buicks with a recessed cover and thicker gears & high press spring. Anything like that available for the 4.0 or would the buick kits fit? has any one tried?

BTW, not having a problem yet but at 68K miles, I think the pump gears & alum cover prob have wear and may look at doing soon.

Top of pagePrevious messageNext messageBottom of pageLink to this message   By D Cantrell (Discodad) on Saturday, December 08, 2001 - 11:06 pm: Edit

Contact http://www.rpiv8.com/homepage.htm Chris sold me one for a 3.9 build up last year

Top of pagePrevious messageNext messageBottom of pageLink to this message   By jp on Monday, December 10, 2001 - 09:47 pm: Edit

I have a 74 3.5 V8 with small old pump gears, still making 40psi at 125k miles +, one slightly noisy tappet. From the SD1 in 76 on the gears got bigger, and feeds to overhead were improved. You can get bigger gears and plate and coverto improve throughput, but usually all you need is regular changes of the oil. Dont go for harder relief spring, the engine needs volume, not pressure. Read Hardcastle on this, talk to RPI.

Top of pagePrevious messageNext messageBottom of pageLink to this message   By Gabriel Guay (Gearhead) on Monday, December 10, 2001 - 11:16 pm: Edit

Read faq pages on RPI and did not realize the pump had been changed to crank driven style pump. Looks like a fairly ruggid design. I agree on the volume not pressure idea. Funny thing, I'v had my truck since new and changed the oil every 3000 miles and always noticed a little lifter clatter even when new. Dealer said it was normal and that they all clatter. Not a ticking but more like light clatter. I now have 68K miles and after reading on this board that someone went to 5W30 & his morning clatter went away and still have 40 PSI when warm, I tried the 5/W30 instead of 10W30. Now the clatter is gone and my oil press is still 30 to 35 PSI same as with the 10W30. I, tninking possibly the pump is suficiant but the oil path is somewhat restrictive in these engines.

Top of pagePrevious messageNext messageBottom of pageLink to this message   By D Cantrell (Discodad) on Tuesday, December 11, 2001 - 12:39 pm: Edit

If you change the pump, To get that inital prime Pack it with Petroleum Jelly really good or you will be looking for a new engine

DD


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