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View Poll Results: What kind of motor oil do you use?
30W 104 50.98%
10W-30 59 28.92%
10W-40 30 14.71%
Detergent 47 23.04%
Non-Detergent 4 1.96%
Natural (as opposed to synthetic) 48 23.53%
Synthetic 9 4.41%
Motorcycle Oil 4 1.96%
SG Grade 6 2.94%
Some Other Variation 12 5.88%
Multiple Choice Poll. Voters: 204. You may not vote on this poll

 
 
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  #18   IP: 107.0.6.242
Old 02-14-2016, 01:48 PM
hanleyclifford's Avatar
hanleyclifford hanleyclifford is offline
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We have had other members report that oil pressure increases with time and temp increase after start up. I have tried to make sense of this because it is counter intuitive to my understanding and experience that viscosity decreases with temp and hence pressure should also decrease. One factor that keeps coming to mind is the nature of the oil pump intake. The "bottleneck" is the 1/8" NPT 90 degree street ell coming right off the oil pump. Since that fitting is a casting, it's cross sectional area is subject to the irregularities of the casting process. Even a small burr in the oil stream could have an influence on flow especially at cold temperatures. Because of the foregoing "theory" I have modified my oil pump to use a 1/4" NPT fitting. The difference in oil flow was impressive and could account for the big pressure differential I live with between start up and cruise. I live with it and enjoy the (relatively) massive flow and pressure increases as well.

Last edited by hanleyclifford; 02-14-2016 at 09:38 PM.
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