Oil Pressure as a function of RPM with 5W-30 Mobil1

4/11/04, thanks to Mark Hlady & Bob Fijal

After 5,000 rpm’s in second the needle just stuck to 55 psi. Mark Hlady had gotten higher readings than I did, reaching 60 psi at 4200. It takes quite a while for the oil to heat up fully, even though the temperature gage is at its normal operating temperature. You can tell this while cruising at 70 mph, the pressure will be at 60-65 psi and slowly drop to 35 psi. It took, in distance, about 15 miles before the oil was at 35. Since Mark got higher readings than I did at the same rpm’s and his is a 99 and mine is a 97, we need Scott Waters to give us some readings from his 96 once he reconnects his gage back up. We can then average them together so everyone will know what to expect in terms of pressure from their cars. My AWA's F-150 pickup comes with an oil pressure gage, why not a SHO?

Bob Fijal

RPM	Oil Pressure	#/1000 rpm
1600	25	1.56
1700	27	1.59
1900	32	1.68
2050	35	1.71
2200	35	1.59
2300	35	1.52
2400	35	1.46
2500	36	1.44
2600	40	1.54
2700	38	1.41
2800	45	1.61
3000	41	1.37
3100	42	1.35
3200	44	1.38
3550	45	1.27
4000	50	1.25
5000	55	1.10	pump relief
6000	55	0.92

Bearing Clearance V8SHO vs 1970's Small Block Chevy

	V8sho	V8SHO		min	SB chevy
	min	max	chevy	in microns	in microns
rod cl	0.0009	0.0023	0.002	22.5	50
Mains	0.0004	0.0012	0.003	10	75
pistons	0.0008	0.0016	0.005	20	125

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