Oil Pressure???

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05-15-2006, 03:09 PM
CMC17

Quote:

Originally Posted by marshall_mosty

We're lucky that Eric doesn't run an oil cooler.... or he would blow a line and slick down the track, right Michael??

I don't? :shock:

Everyone stay well behind me....just incase!
05-15-2006, 04:06 PM
marshall_mosty

Nevermind... I guess I'm confusing that with an oil temp gage... right??
05-15-2006, 04:52 PM
gt40

Quote:

Originally Posted by CMC17

It's a fairly new pump (Melling HP).

OK, first off, almost every engine builder I've talked to says unless you have a specific reason for running a high-pressure or high-volume pump, stick with standard, blueprinted pumps.

On my car, with a plain-jane Melling pump cold idle pressure is 70psi (right where the relief valve is supposed to be set for.)

Hot idle (after a race,) is 20psi running fresh Mobil1 20w50. (I've no idea what the oil temps are -- I'm afraid to install a gauge!) ;)

Quote:

I think one of the reasons for low pressure on my other motor was the gasket where the pump meets the block had a tear in it. I'm sure it had to be sucking some air.

If its where the pump meets the block, you'd be pissing oil -- and probably were. Not a good thing from a aeration standpoint.

Quote:

The gauge would bounce around during a race. The newer motor has 79k on it. The rebuild was done at 77k. 2k on the rebuild and they guy I bought it from didn't know the clearance numbers..etc. It was done by a reputable shop and all looked good when I lugged it home.

It probably has production/street bearing clearances in it, meaning it'll have higher oil pressure than a worn engine or one built with looser clearances for racing. Bud's correct -- your numbers look OK for a fress motor with production clearances and a HP pump.

Quote:

Changing oil this evening to see if I can get it to drop some psi. Wish me luck. =)

My money says you won't. Bite the bullet and put in a standard pump.
05-15-2006, 10:32 PM
David Love AI27

Quote:

Originally Posted by CMC17

I think one of the reasons for low pressure on my other motor was the gasket where the pump meets the block had a tear in it. The gauge would bounce around during a race. The newer motor has 79k on it. The rebuild was done at 77k. 2k on the rebuild and they guy I bought it from didn't know the clearance numbers..etc.

Since you seem a little unsure, I suggest keeping the revs under 3,000 for the rest of the year till you are sure of the required breakin period for the motor. Maybe three or four weekends to get a good 1,000 miles under your belt. Then you might try bumping it up to 4,000 RPM in practice but not during races in case the motor blows. By the start of the 2007 season I'm sure the motor will be ready for full race mode. Just a suggestion...
05-16-2006, 03:06 PM
CMC17

5psi difference at idle with:

Royal Purple 20w/50 - 80psi
Mobil 1 5w/30 - 75psi

After the dyno pulls, 70psi at idle. No explosions.... yet. 8)
05-16-2006, 03:13 PM
michaelmosty

Quote:

Originally Posted by CMC17

After the dyno pulls 8)

and the results....... :lol:
05-17-2006, 09:36 PM
Todd Covini

Well at least it's good to see that you've come to your senses and put Mobil 1 in there.

However, even idling at 75 psi...you won't last the weekend. The motor will likely give up the ghost at the most opportune time. Don't worry about it though. Try not to think too much about it when your rearview mirror keeps flashing "MOBIL 1" from side to side at you. :twisted:

I'm sure it's just that little piece of gasket.
Just put it out of your mind.
No worries.
Nope. ;-)

-=- Todd
05-18-2006, 03:57 AM
jeffburch

Quote:

Originally Posted by Todd Covini

Well at least it's good to see that you've come to your senses and put Mobil 1 in there.

However, even idling at 75 psi...you won't last the weekend. The motor will likely give up the ghost at the most opportune time. Don't worry about it though. Try not to think too much about it when your rearview mirror keeps flashing "MOBIL 1" from side to side at you. :twisted:

I'm sure it's just that little piece of gasket.
Just put it out of your mind.
No worries.
Nope. ;-)

-=- Todd

:lol:

jb
05-18-2006, 07:45 AM
CMC17

Quote:

Originally Posted by Todd Covini

Well at least it's good to see that you've come to your senses and put Mobil 1 in there.

However, even idling at 75 psi...you won't last the weekend. The motor will likely give up the ghost at the most opportune time. Don't worry about it though. Try not to think too much about it when your rearview mirror keeps flashing "MOBIL 1" from side to side at you. :twisted:

I'm sure it's just that little piece of gasket.
Just put it out of your mind.
No worries.
Nope. ;-)

-=- Todd

If you can't beat 'em, might as well buy stock in them and user their product (Mobil 1). lol!!!

The engine is sooooo smooth. I stood a nickel on end on top of the upper intake and it never fell over at idle. I couldn't help but rub my hands together, arch my back and scream like Dr. Frankenstein.. "IT'S AAAALLLLLIIIIIVVVVEEEE"... muaahaahahahaha.

Ok, back to reality. The $75 shortblock my give up the ghost during practice and I will be screaming something else.

Here's to some good racing this coming weekend. :toast:

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