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Old 06-01-2005, 23:01   #1 (permalink)
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Question high oil presure

Hi all, You blokes sound like you know what your talking about so ill ask your opion. Would 110psi oil presure be right for a 378ci clevo? That has a crow restrictor kit and a mellings high flow oil pump the lifter bores are brass sleeved also, I think the oil gallries have been opened up in the back of the cam shaft and the crank for more oil. When i went to ask the bloke that machined the block he said that its fine. I've asked around and some people say that its to high some say its ok. Also Ive had trouble with the oil filter blowing the seal could that be from high oil pres as well or poor product. Im running HPR50 oil maybe to thick for this combo I duno!! thats what ive always run in my motors.
Your opions would be great thanks Mick
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Old 06-01-2005, 23:27   #2 (permalink)
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Re: high oil presure

It puts lots of stress on the oil pump drive/dizzy gear. Maybe run lighter oil.
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Old 06-01-2005, 23:29   #3 (permalink)
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Re: high oil presure

110 sounds quite high, mine runs 70 at start then drops to around 40 as it warms up.
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Old 06-02-2005, 00:00   #4 (permalink)
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Re: high oil presure

Is the 110 at idle or under load, it should be around 10psi for every 1000rpm, so if you have that pressure at 11000rpm it's ok, if not there is something wrong.
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Old 06-02-2005, 01:28   #5 (permalink)
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Re: high oil presure

You should buy a new oil pressure gauge cause that one isn't working right. At 110psi the oil filter would pop off.

[edit]HPR 50 is good but really it's too thick (40-70W). You should have 20-50W in it.
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Old 06-02-2005, 01:40   #6 (permalink)
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Re: high oil presure

110 is a tad too high..... I used to blow oil pressure senders in my XD at 100.

One question, why fit a high volume pump in a cleveland, especially if you have a restrictor kit fitted? I have never had problems with a standard pump.
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Old 06-02-2005, 02:05   #7 (permalink)
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Re: high oil presure

Quote:
Originally Posted by RPO-083
One question, why fit a high volume pump in a cleveland, especially if you have a restrictor kit fitted? I have never had problems with a standard pump.
And sleeved lifter bores.
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Old 06-02-2005, 02:17   #8 (permalink)
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Re: high oil presure

Theres a difference between pressure and volume. All well and good to have loads of pressure but it useless without volume. It works the same way as fuel pumps.

I went and had a word with Chris @ Speedpro. He's been drag racing Clevelands for years. At 6500+ he recommends a high vol pump. Below that he say a standards fine. He said standards won't hold pressure @ 6500-7000rpm.

xdclevo : you sleeve lifter bores because the lifter bored needed machine due to being wide @ the bottom and narrower at the top. So with a high lift cam the lifter gets stuck and doesn't turn. Causing a lifter and cam damage. It's only common with high lift cams.

Brenden
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Old 06-02-2005, 02:22   #9 (permalink)
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Re: high oil presure

Quote:
Originally Posted by xdclevo
And sleeved lifter bores.
Clevo's get way too much oil in the rocker covers even with a Std pump at revs.
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Old 06-02-2005, 02:31   #10 (permalink)
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Re: high oil presure

Quote:
Originally Posted by brenx
xdclevo : you sleeve lifter bores because the lifter bored needed machine due to being wide @ the bottom and narrower at the top. So with a high lift cam the lifter gets stuck and doesn't turn. Causing a lifter and cam damage. It's only common with high lift cams.

Brenden
They are sleeved for a number of reasons. And the sleeves are drilled with a certain sized "restrictor" hole, oviously resulting in less oil volume being lost.
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