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Piston Squirters
- Thread starter Taltruda
- Start date
BoydBirchler
Well Known Member
The engines I've had, that had piston oil squirters used more oil for sure. I did not notice much difference in CHT's or oil temps. I still like the squirters.., I think they may help get more lubrication on the cam.
andoman
Well Known Member
My PV IO-540 has them. Stock other than 9:1 pistons and the nozzles. I have no “before” comparison, but I do have some observations and theories:
-my oil consumption is a tad high at 8-10 hrs per quart. I have an oil separator that I drain after each flight. I get a few tbs. per hour. My oil stays relatively clean so I don’t think blow by is the cause. I blame extra oil misted by the squirters as a factor.
-my oil temp took several fixes to become manageable: A 15 row primary and Setreb secondary cooler; tossed the VT for a plunger; 4 cowl flaps. I do a lot of slow, high AOA maneuvering so some of my temp issues are due to time spent in that corner of the envelope, but squirters definitely add more heat to the oil that must be addressed. I can now easily manage my oil temps to the equal of my IO-320 RV-4 brothers in our local formation group.
-my CHT’s don’t run overly cool like the AV IO-360 I had on my -7A. I believe that the larger fin area of the AV head is what results in the AV’s cool CHT rep rather than heat being taken out of the piston skirts,
None of the above is an indictment of the nozzles. I believe they are a plus in the engine as a system.
Just my 2/5th of a nickel…
-my oil consumption is a tad high at 8-10 hrs per quart. I have an oil separator that I drain after each flight. I get a few tbs. per hour. My oil stays relatively clean so I don’t think blow by is the cause. I blame extra oil misted by the squirters as a factor.
-my oil temp took several fixes to become manageable: A 15 row primary and Setreb secondary cooler; tossed the VT for a plunger; 4 cowl flaps. I do a lot of slow, high AOA maneuvering so some of my temp issues are due to time spent in that corner of the envelope, but squirters definitely add more heat to the oil that must be addressed. I can now easily manage my oil temps to the equal of my IO-320 RV-4 brothers in our local formation group.
-my CHT’s don’t run overly cool like the AV IO-360 I had on my -7A. I believe that the larger fin area of the AV head is what results in the AV’s cool CHT rep rather than heat being taken out of the piston skirts,
None of the above is an indictment of the nozzles. I believe they are a plus in the engine as a system.
Just my 2/5th of a nickel…
pazmanyflyer
Well Known Member
I have them in my -M1B I built up. Just switched over from 8.5 to 9:1 pistons in Superior PV cylinders. I trade a few degrees (lower) CHT for a few degrees (higher) oil temp. I have SW 8432R oil cooler for the AZ heat. Normal CHT for me are 360-375 in cruise and oil temps around 185-195 in cruise. Breaking in the 9:1 right now and I see 385 CHT and 210 OT at 25"/2450 rpm (78% power) with 80 degree outside temp. Regarding oil consumption, I was 1 qt for every 10-12 hours with the 8.5:1. Not enough time with the 9:1 for any good numbers yet.
