Oil Pressure???

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Originally Posted by oz98cobra

related Corner Carvers post with some possibly useful info:

http://forums.corner-carvers.com/arc...hp/t-3319.html

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Thx Daron!!!

At least I only have 80psi at startup and no 100psi like that guy did! lol I will probably switch to a thinner oil first to see if I can get it to drop 10-20psi.

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Originally Posted by CMC17

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Originally Posted by oz98cobra

If it was a Ford mod motor, those pressures would not be alarming, but for a 5.0? That's waaay up there! Sure you didn't fill the crankcase with gear oil by mistake? ;)

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I thought about going with a lighter oil once I saw the oil pressure.

Current oil: Royal Purple 20w/50 (6qts)

http://www.tek-racing.net/cmc17/ItLivesCMC17.mpg

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Uuuuh, does that vid have any sound?

jb

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Originally Posted by jeffburch

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Originally Posted by CMC17

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Originally Posted by oz98cobra

If it was a Ford mod motor, those pressures would not be alarming, but for a 5.0? That's waaay up there! Sure you didn't fill the crankcase with gear oil by mistake? ;)

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I thought about going with a lighter oil once I saw the oil pressure.

Current oil: Royal Purple 20w/50 (6qts)

http://www.tek-racing.net/cmc17/ItLivesCMC17.mpg

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Uuuuh, does that vid have any sound?

jb

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It should.. but only one channel for some reason. Try the Left or Right..won't be on both.

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Originally Posted by oz98cobra

If it was a Ford mod motor, those pressures would not be alarming, but for a 5.0? That's waaay up there! Sure you didn't fill the crankcase with gear oil by mistake? ;)

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Yep! When my motor was new it would hover around 100psi at idle cold, then settle down to 70 at idle and 90 during a race. that was with 10-40 oil!!!

Now with three events on it, it is at 75 cold at idle, then settles into about 50 with warm oil and about 70-80 during the race.

That much pressure in a 5.0 tells me you have a tight engine that is going to free up power at some point when it loosens up. Be careful. You may also have issues with lifters coming apart and the oil galley plugs as Marshall mentioned. If it were me, I would be worrying about too much pressure and not enough oil flow.....go to a good 5-30 oil and see how it does. Once the clearances free up, then you can step up the oil weight....

(I haven't read the CC thread yet, so this may be covered there -- I dunno yet...)

I'm having trouble understanding how the same pump can generate such high oil pressure in a different motor.

As I understand it, there's a bypass port in the pump itself. It's spring-loaded and set to start bypassing oil once the pressure hits a certain point (70-80 PSI for a normal pump, somewhat higher for a high-pressure pump.)

Is this pump a regular or a high-pressure pump?

[quote="CMC17"]

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Originally Posted by jeffburch

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Originally Posted by CMC17

Quote:

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Originally Posted by oz98cobra

If it was a Ford mod motor, those pressures would not be alarming, but for a 5.0? That's waaay up there! Sure you didn't fill the crankcase with gear oil by mistake? ;)

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I thought about going with a lighter oil once I saw the oil pressure.

Current oil: Royal Purple 20w/50 (6qts)

http://www.tek-racing.net/cmc17/ItLivesCMC17.mpg

---

Uuuuh, does that vid have any sound?

jb

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Weird computer issue on my end.
WinDVD, no sound.
WinMedPlr, no play.
Divx player, right ch. good.

Sounds great!



jb

[quote="jeffburch"]

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Originally Posted by CMC17

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Originally Posted by jeffburch

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Originally Posted by CMC17

Quote:

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Originally Posted by oz98cobra

If it was a Ford mod motor, those pressures would not be alarming, but for a 5.0? That's waaay up there! Sure you didn't fill the crankcase with gear oil by mistake? ;)

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I thought about going with a lighter oil once I saw the oil pressure.

Current oil: Royal Purple 20w/50 (6qts)

http://www.tek-racing.net/cmc17/ItLivesCMC17.mpg

---

Uuuuh, does that vid have any sound?

jb

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Weird computer issue on my end.
WinDVD, no sound.
WinMedPlr, no play.
Divx player, right ch. good.

Sounds great!

jb

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Cool!!

I should have posted this one instead.

http://www.tek-racing.net/cmc17/ItLivesCMC17.wmv (Windows Media/2.5meg)

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Originally Posted by gt40

(I haven't read the CC thread yet, so this may be covered there -- I dunno yet...)

I'm having trouble understanding how the same pump can generate such high oil pressure in a different motor.

As I understand it, there's a bypass port in the pump itself. It's spring-loaded and set to start bypassing oil once the pressure hits a certain point (70-80 PSI for a normal pump, somewhat higher for a high-pressure pump.)

Is this pump a regular or a high-pressure pump?

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

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

If it is a Melling HV or HP, those #'s are where it should be. On a cold fresh motor 70-80 at idle is normal.

**Edited to remove the reference to Eric not having an oil cooler... my bad.**