oil temps Rebel O-320 Engine
Posted: Sat Feb 18, 2012 9:16 am
Been discussed at length before Bob, but one thing that I don't think came
up at the time as a variable was weather you are running just the oil bypass
plunger or have a vernatherm in the screen/oil filter adapter.
O-320's running a bypass plunger...like most A2B's etc that have come from
Cubs....the oil cooler is on at all times and the bypass plunger is there
(in the accessory case on an angle below where the screen bulb bolts on) for
when the oil is too think to get through the cooler it pops open to bypass.
Other than that the cooler is functioning all the time and why you have to
block the cooler pretty much right off in the winter and sometimes even
through most of the summer.
When running a vernatherm (screen bulb has BIG nut in center and temp prob
to the side) the oil only goes to the cooler when this unit opens (just like
a car rad thermostat). I have found that the engines running a vernatherm
generally run hotter than those that don't. First reason is a restricted oil
flow to the cooler and secondly quite a few of these units stick and don't
open properly or at all. If you have a vernatherm then you will see higher
temps at even this time of year. My trip to Brampton the other day saw a
steady 210/215 at 2500 RPM. A little hotter if I lean aggressively. Don't
see much worse on 95* days, but it might hit 225* (that I don't get excited
about) if I am really pushing her. I like 210/215 though, it makes sure the
water boils and gets the heck out of my engine. 170/180 temps just form a
cloud inside the engine and redeposit the moisture!
Start there and tell me/us what you have!
Wayne
----- Original Message -----
From: "Bob Fisher" <rgfisher@zeuter.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 9:55 PM
Subject: oil temps
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up at the time as a variable was weather you are running just the oil bypass
plunger or have a vernatherm in the screen/oil filter adapter.
O-320's running a bypass plunger...like most A2B's etc that have come from
Cubs....the oil cooler is on at all times and the bypass plunger is there
(in the accessory case on an angle below where the screen bulb bolts on) for
when the oil is too think to get through the cooler it pops open to bypass.
Other than that the cooler is functioning all the time and why you have to
block the cooler pretty much right off in the winter and sometimes even
through most of the summer.
When running a vernatherm (screen bulb has BIG nut in center and temp prob
to the side) the oil only goes to the cooler when this unit opens (just like
a car rad thermostat). I have found that the engines running a vernatherm
generally run hotter than those that don't. First reason is a restricted oil
flow to the cooler and secondly quite a few of these units stick and don't
open properly or at all. If you have a vernatherm then you will see higher
temps at even this time of year. My trip to Brampton the other day saw a
steady 210/215 at 2500 RPM. A little hotter if I lean aggressively. Don't
see much worse on 95* days, but it might hit 225* (that I don't get excited
about) if I am really pushing her. I like 210/215 though, it makes sure the
water boils and gets the heck out of my engine. 170/180 temps just form a
cloud inside the engine and redeposit the moisture!
Start there and tell me/us what you have!
Wayne
----- Original Message -----
From: "Bob Fisher" <rgfisher@zeuter.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, May 24, 2004 9:55 PM
Subject: oil temps
*-------------------------------------------------------------------------*hi gang are any of you having trouble with slightly higher than
desirable oil temperatures if so what have you done?
i`m running at about 210deg f at 2400 cruise this is still ok but at
this time of the yr tending to be too warm? maybe
i have the speed cowling
any ideas thanks bob fisher rebel 342 amphib 160 hp
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