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Old 02-09-2003, 10:39 AM
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Question oil pressure dipping....and rising

so I cant find a topic just like this, but sorry if this is a rehash...

I have a 350 with aftermarket carb/intake/headers but otherwise stock. my oil pressure is funky.
when its cold its at ~50
as it gets warm (180-200) it drops to about 35-40ish and starts to get weird... when I accelerate the oil press drops to 20-0 but come back up when I get off the gas
then once Ive been driving for a bit (15 min or so,210-220) it drops to 25 at idle and when I accelerate it drops to zero, but comes back to 25 when off the gas.

other factors:
oil level is normal, this happens in drive gear, but sometimes happens in neutral, but not allways....

any Ideas? Im guessing the oil pump is having issues, Im ordering a new high vol pump kit from summit along with some other parts.

But any input would be great, thanks alot

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Old 02-09-2003, 10:44 AM
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while you're changing the pump pull a front main bearing and check for wear, could be a little of both, pump and bearings
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Old 02-09-2003, 12:02 PM
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My rides doing the same thing. If you go to search at the top of the page and search "oil pressure" than you will see many post's on the subject.
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Old 02-09-2003, 04:44 PM
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sometimes a bad rod bearing will do it,as the motor spins faster it kinda slings the oil out of the rod because the rod is spinning around the crank .
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Old 02-09-2003, 04:47 PM
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Red face

It really sounds like a loose bottom end to me too.
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Old 02-11-2003, 07:06 PM
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Unhappy

what does a loose bottom end mean? is that a rod bearing term? <img src="graemlins/sweat.gif" border="0" alt="[sweat]" />

that dosent sound very nice, hehe.

well either way, Im going to pick up an oil pump kit and new oil pan when I get my rad and water pump...
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Old 02-12-2003, 05:32 PM
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Exclamation

so here are the pic of what I am seeing, Im sorry about the file size (~180k) and the focus, my camera had the floor behind the gagues PERFECT (duh).

well here is me under normal driving at about 30mph(not wot)
http://hotrodders.com/photos/00005401/offgas.jpg

now if I shift it into Neutral at a stop it goes to about the middle of these two pics.


thanks

[ February 12, 2003: Message edited by: VRTSid ]</p>
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Old 02-12-2003, 06:41 PM
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Cool

What the fellas are saying is they think your bottom end is well "experienced" and therefore a little loose. Sometimes loose is better than too tight in a bottom. Mostly though, just right is gooder yet.

When you pick up your other parts, ask for some Plasti-Gauge. This is really great stuff that looks like string, but it flattens in a controlled manner when placed between metal parts that are then squeezed together, Ie, the bolts are torqued on the main caps and/or rod bearing. Using this will tell you how much clearance there is between your rotating parts.

Everybody above and me as well think there is way too much. Time for new bearings, methinks sir.

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Old 02-12-2003, 06:52 PM
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Use the narrowest part of the plastiguage (indicating most clearance) as the measurement (in case of journal taper).
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Old 02-16-2003, 06:29 PM
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Cool

Sid, you asked, "What does a 'loose bottom end' mean?"

Well, where I come from, that's blanket terminology for worn rotating assembly components.

Most generally, rod main and cam bearings.
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