kcadby
Pro
Posts: 1733
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posted January 25, 2002 03:20 PM
quote:
Is there a real problem here? What happens if oil capacity can't supply enough oil for the increased pressure/flow. The biggest problems come from starvation/low capacity.
Koz
BINGO!!!
I agree with Koz 100%...
FYI...now that I have another 12-motor apart (waiting for parts-AKA-money)  ...
I don't see how the larger volume 2002 oil pump can "R&R" into the older motors 
I'll post pictures later but...the oil pump housing itself is...PART OF THE LOWER CASE half and can't be removed!!!
I've been wrong about lots of things before but...I just don't see it being a "swap"...
   
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Ninjaman12R
Needs a job
as a Deal's Gap tour guide.
Posts: 4767
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posted January 25, 2002 04:54 PM
Damned good thread........
I like these kind of threads. Pros and cons getting hashed out amongst us gearheads. 
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What we're dealin' with here is a complete lack of respect for the law.
Sheriff Buford T. Justice of TEXAS
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hondo
Expert Class
Posts: 140
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posted January 25, 2002 07:36 PM
My oil temperature in the pan has never been over 150 degrees. I've installed oil temperature and oil pressure gauges with high reading recall. Haven't been for a ride since. Can't hurt though.
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Candy Persimmon Red may be slower, but I'm trying!
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ra12r
Zone Head
Posts: 919
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posted January 27, 2002 06:20 AM
So let me repeat what i think i just learned,
"to place a shim in the relief valve will NOT increase my pressure to my bearings..." ?!?!?!
But, it will increase the pressure required to cause the valve to release....?!
Why is the need for a release valve there anyway then if it is not regulating the oil pressure?
Interjection for the why bearing problems.....has anyone had a bearing problem that has not advanced the timing?!
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All must bow to the "Ra Supremecy"...
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hondo
Expert Class
Posts: 140
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posted January 29, 2002 04:50 AM
 Edited By: hondo on 29 Jan 2002 05:03
Eventually the system oil pressure will rise. You just have to get to the point, RPM'S, where the pressure release valve was opening. With it shimmed, a higher system pressure will be reached before the release valve opens. The benifit is to ensure an adaquate oil supply to the bearings under high loading conditions. The bearings are actually a controlled leak. Larger gap = faster leak, a higher system pressure ensures plenty of oil flow. To put it another way, if a higher volume pump was available, oil pressure would also increase though at lower RPM'S (up till the relief valve opens) due to the controlled leaks being the same size. If adequate oil flow exists at 5/10th's riding then shimming the stock pump would rob less HP than a higher volume pump at 5/10's.
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Candy Persimmon Red may be slower, but I'm trying!
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ra12r
Zone Head
Posts: 919
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posted January 29, 2002 05:42 AM
I will definitely be doing the mod!!!
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All must bow to the "Ra Supremecy"...
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psycho1122
Pro
Posts: 1608
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posted January 29, 2002 06:37 AM
I am suprised to notice that Doug Meyer has not posted on this topic..............Usually he will post his opinion.
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You say PSYCHO like it's a BAD thing!!
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted January 29, 2002 07:56 AM
Well, hold on. I have to sift through all that crap before I open my keyboard.
Essentially Y2 and Koz have it right.
The shim only delays the pop-off point. It limits the maximum oil pressure possible in the system to prevent damage due to blockage, very cold high vis oil, etc. If you do not reach that point the shim is irrelevant.
I'm not of the opinion that there is a "problem". We see more cranks than anyone but Falicon (1361 cores) and I've yet to see one that shows an imminent problem. As I said on Mad Mike's engine thread, I think most of what you see is within the normal parameters of a mass produced engine that has the crap beat out it. Yeah, I'm talkin to you. You know who you are!
Doug
Doug
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
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psycho1122
Pro
Posts: 1608
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posted January 31, 2002 08:42 AM
Thanks Doug!
Thank you for your input !
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You say PSYCHO like it's a BAD thing!!
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