50wt = 85psi. 40wt = XXpsi ?????

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Oil experts. My engine is currently spinning along with synthetic 20W-50 and making the following oil pressures @ 200F:

85psi @ 4000RPM
105psi @ 6500RPM

I think this pressure is too high since the factory manual states the spec as 60psi @ 4000RPM.

Does anyone have an educated guess where my pressures would end up if I switched to 10W-40 or even a thick 30wt like GC 0W-30?
 
i WOULD FIRST LOOK AT THE MANUFACTURES DATA SHEET INFO. COMPARE THE VISCOSITIES AT 100 c (212F). Ops Sorry about the caps-I will take all verbal abuse now thank you.
 
Or a 351 Cleveland
wink.gif
 
Old Porsche 911. The manual does spec 20W-50 as an approved oil for this operating temp but IMO the final oil pressure is too high.
 
Originally Posted By: Gary Allan
Will a stock 351 pull 6500? I guess that's within it's limits.
Cleveland engines are incredable engines. I have a bud that has a real nice Pantera and it is scarey fast .The intake and exhaust ports seem as big as a big block Chevy .
 
Originally Posted By: Gary Allan
Will a stock 351 pull 6500? I guess that's within it's limits.


The Cleveland was a rev'er, had smaller main bearings. It was the hi-po version of the 351, don't confuse it with the old Windsor, which had 3" mains and was designed for passenger car and truck usage. Though it's now a pretty common base for performance 408 builds.....
 
Originally Posted By: Steve S
Originally Posted By: Gary Allan
Will a stock 351 pull 6500? I guess that's within it's limits.
Cleveland engines are incredable engines. I have a bud that has a real nice Pantera and it is scarey fast .The intake and exhaust ports seem as big as a big block Chevy .


That's because they were. The Cleveland was an incredible engine: A smallblock with big-block canted-valve heads.
 
Hi,
ringmaster - What is the MY of your 911?

I would check the pressure relief valve's operation, the oil filter's condition and monitor the oil's temperature as starting points. Is an oil cooler fitted (other than "trombone") and what temperature is your current ambient range?

Typically you should expect around 5bar (72-75psi) at 90C lube temp and 4000rpm

These engines generally perform better on a 15w40 HDEO(20W-50 was/is used a bench mark) but any decrease in hot OP is likely to be quite small

These engines (early 60s) started out on Shell Rotella/Rimula HD SAE20W-20 (Euro winter) or HD SAE30 (Euro summer) with HD SAE40 used only in very hot conditions
 
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OK, this is getting waaaay OT but the Clevo and Windsor are totally different engines.
The Cleveland was built in Oz till about '82-'84, and these engines are the ones used by DeTomaso.
In the early eighties DeTomaso actually shipped partial kits to Oz where the engines were then fitted. At the time Ford had officially stopped production of their V8 here, but it appears they kept casting and building for DeTomaso, at least for a little while.
Generally the Oz built engines had a higher nickel content in the iron, and were a little better finished.

I have an early eighties production unit in an '80 model F series. 4V valves in 2V 302 bathtub heads, etc, etc, running on LPG (propane)
A cousin had a full house 4V Clevo in a GT Falcon.
Thing didn't start to work till it hit 4 grand, then hang on as the tach swept past 6500....
I've had a couple of Clevo's on the wrong side of 6500, one was in top gear at the time.......
 
Originally Posted By: tdi-rick
OK, this is getting waaaay OT but the Clevo and Windsor are totally different engines.
The Cleveland was built in Oz till about '82-'84, and these engines are the ones used by DeTomaso.
In the early eighties DeTomaso actually shipped partial kits to Oz where the engines were then fitted. At the time Ford had officially stopped production of their V8 here, but it appears they kept casting and building for DeTomaso, at least for a little while.
Generally the Oz built engines had a higher nickel content in the iron, and were a little better finished.

I have an early eighties production unit in an '80 model F series. 4V valves in 2V 302 bathtub heads, etc, etc, running on LPG (propane)
A cousin had a full house 4V Clevo in a GT Falcon.
Thing didn't start to work till it hit 4 grand, then hang on as the tach swept past 6500....
I've had a couple of Clevo's on the wrong side of 6500, one was in top gear at the time.......


Yes, which was my comment to Gary.

Both were smallbock engines with interchangeable heads though. The Cleveland and the Windsor were different in deck height, main bearing size and a host of other things, such as the water neck being part of the block on the front of the intake...etc.

In 1969, a set of Cleveland-derived heads made their way on top of a 4-bolt version of the 302 Windsor and became known as the BOSS 302. A 9,000RPM+ smallblock with heads that flows like toilets.

A not-so-common-anymore home-grown engine is the Clevor; basically a Windsor with Cleveland heads. A number of companies made intakes and/or intake adaptor plates for this application.

You aussies were lucky you had it as long as you did, emissions regulations killed it's production here after only a few short years; it was an engine the GM boys hated.
 
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Originally Posted By: genynnc
GM boys hated? I'll take a DZ 302 all day over a 'boss' 302...


And I'd take a BOSS 429 or 427 SOHC over any engine GM ever made. GM's 302 was nothing special nor exotic, at least Ford's was an interesting hybrid with incredible performance potential.....

I have a good friend with a set of GM 302 heads with some mild port work on a 355 in his S10. Cam came from Camshaft Innovations.

The man who ground that cam has a set of heavily massaged BOSS 302 heads that flow in the neighbourhood of 400cfm.

They are mounted on a 367ci SBF based on a stock Ford R block.

GM's 302 heads had NOTHING on these:

BigRedHeads.jpg
 
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