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Old 01-11-2004, 20:23   #1 (permalink)
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Oil PSI problem

Hi All
I built my self a warm 351C mid last year, I don't drive it much as it is my week ender, I'm having a problem with my oil presure, when the engine gets over 170 degrees the oil psi fluctuates from 40 to 60. It could be my Auto Meter gauge stuff'n up. Has any one had the same problem ?
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Old 01-11-2004, 20:43   #2 (permalink)
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Re: Oil PSI problem

Flutuate from 40-60psi? You'd have to expand on that just a tad more.

Does it hold constant oil pressure @ a particular rpm? If not clevelands tend to push all the oil into the heads and leave none @ the crank. An oil restrictor kit will fix this and so will a 7lt sump.

As the rpm fluctuates so will the oil pressure. This is normal. More rpm = more pressure.

Brenden
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Old 01-11-2004, 22:09   #3 (permalink)
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Re: Oil PSI problem

I have a restricktor kit in it.
Yes I understand that when the RPM goes up so does the PSI, but at constant RPM say 3000 RPM the gauge Flutuates from 40 to 60 PSI.
Any Ideas?
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Old 01-11-2004, 22:52   #4 (permalink)
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Re: Oil PSI problem

If the problem occurs only at higher temps it sounds like oil viscosity isn't sufficient. What grade of oil are you using? In the summer heat I wouldn't go any less than a 60 grade myself..
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Old 01-11-2004, 23:05   #5 (permalink)
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Re: Oil PSI problem

What type of pump do you have and what size sump?
First I'd check pressure with mechanical guage even if fitted under bonnet..
The oil thickness shouldn't make any difference so lond as it's quality oil, other than being slightly lower at low rpm.With engine in good nick...

Try adding 1/2 litre of oil and see if it makes any difference??
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Old 01-11-2004, 23:48   #6 (permalink)
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Re: Oil PSI problem

I just bought and fitted an autometer ext oil pressure guage.... its a piece of shit and total waste of $100.

Their top end guages are good but the cheapies are not worth having. Mine is off by 30psi @3000rpm, checked with a real guage.
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Old 01-12-2004, 04:08   #7 (permalink)
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Re: Oil PSI problem

Fit a mechanical guage and actually check what it doing, at what revs, and at what temp :)
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Old 01-12-2004, 06:46   #8 (permalink)
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Re: Oil PSI problem

I've just fitted all autometer mechanical gauges to my car (silver ultralites) - they are a dream and pleasure to watch - and don't tell lies!

Is your gauge electrical or mechancal? Try changing the sender if its an electrical job.

Mine sits steady at about 60psi@3000rpm - Mellings HV pump.

Cheers
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Old 01-12-2004, 14:34   #9 (permalink)
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Re: Oil PSI problem

First of all I use Penrite 30, I've never had any problem with this grade before, I might try a 50 grade oil.
The oil system consists of a modified standard sump with a windage tray By Russell oil pans, new stock Mellings pump with longer pickup, restrictor kit, slandered Rico filter & Pro Comp Auto Meter mechanical gauge.
Thanks for your suggestions, I will try a few . If any one has any other suggestions that would be great.
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Old 01-12-2004, 15:02   #10 (permalink)
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Re: Oil PSI problem

Quote:
Originally Posted by TruBlu351
I've just fitted all autometer mechanical gauges to my car (silver ultralites) - they are a dream and pleasure to watch - and don't tell lies!

Is your gauge electrical or mechancal? Try changing the sender if its an electrical job.

Mine sits steady at about 60psi@3000rpm - Mellings HV pump.

Cheers
Yeah Ultra lites are one of the decent ones I'm refering too, mines a sport mechanical and with a real guage attached I got the exact same reading as you (same oil pump too BTW!) the autometer on the sill showed 30psi.

Not happy with it and its going back to the shop where I will spend the extra and get a decent guage.
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