Oil Pressure - too much information?

[Bob_Belville]

In conjunction with the last annual on my E (IO 360A1A) I had the oil pressure adjustment spring changed to the next stronger spring. The intent was to move the OP up further into the green. the older spring was adjusted all the way in.

The new setup achieved the desired results, cruise OP is in the 70s, comfortably in the green even with level below 6 qts and OT over 200F. 

I have a JPI EDM and I note that at startup OP exceeds 100 psi for 30-60 seconds. The highest I've seen is 107. By the time the OT gets to 140 and ready for T.O. OP is down to 90 or less.

I can back off on the spring adjustment which might lower the cruise as well as the initial, idle, OP - but I wonder whether someone here would like to pontificate on how seriously I should take the "momentarily" red line plus pressure?

 

[clh]

The greatest concern with high oil pressure is you are stressing your seals. You are more likely to develop engine leaks if you over pressure your oil.  The worst would be if you blow out your oil cooler or supply hoses.

 

 

[Yetti]

Aren't the hoses good for say 1500 PSI

[Guest]

25 minutes ago, Bob_Belville said:

In conjunction with the last annual on my E (IO 360A1A) I had the oil pressure adjustment spring changed to the next stronger spring. The intent was to move the OP up further into the green. the older spring was adjusted all the way in.

The new setup achieved the desired results, cruise OP is in the 70s, comfortably in the green even with level below 6 qts and OT over 200F. 

I have a JPI EDM and I note that at startup OP exceeds 100 psi for 30-60 seconds. The highest I've seen is 107. By the time the OT gets to 140 and ready for T.O. OP is down to 90 or less.

I can back off on the spring adjustment which might lower the cruise as well as the initial, idle, OP - but I wonder whether someone here would like to pontificate on how seriously I should take the "momentarily" red line plus pressure?

 

Some time back Lycoming raised the limits to 115 psi.  Most airframes are still certified to 100 psi.  As long as the pressure comes down to airframe limits when it warms up you have no worries.  Oil filters and oil coolers will rupture at much higher pressures.

Clarence

[jetdriven]

I'm not sure how the engine knows to blow out the seals at 115 PSI when bolted to a mooney firewall and not a Cessna 172SP.

which seals are we talking about, anyways, the crankcase nose seal? I thought it was only exposed to crankcase pressure. 

Edited April 1, 2016 by jetdriven

[Bob_Belville]

10 hours ago, jetdriven said:

I'm not sure how the engine knows to blow out the seals at 115 PSI when bolted to a mooney firewall and not a Cessna 172SP.

which seals are we talking about, anyways, the crankcase nose seal? I thought it was only exposed to crankcase pressure. 

Does the C172 have a higher OP red line?

[Bob_Belville]

10 hours ago, jetdriven said:

I'm not sure how the engine knows to blow out the seals at 115 PSI when bolted to a mooney firewall and not a Cessna 172SP.

which seals are we talking about, anyways, the crankcase nose seal? I thought it was only exposed to crankcase pressure. 

Ms. Google found the answer to my question, Bryan!