[rebel-builders] Elite Hi oil temp

[Richard Wampach]

The 1977 172N with the "H" series 160 HP came with a 4" duct from the
vertical baffle on the right side behind the cyls, down to the cooler
which was mounted to the firewall. It ran hot!
A factory mod was to move the cooler up and mount it to the vertical
baffle and eliminate the 4" duct. This reduced the oil temp by 20*F.

How hot is the Cylinder head temp? Having tight baffling is a must!
That is to say no place for air to by-pass the cylinder cooling fins.
Any air that by-passes cause a two fold effect on cooling. First that
air is not doing any cooling. Second it creates a reduced pressure
differential between the ram air in the intake plenum verses the low
pressure near the cowling exit. It only takes a combined few square
inches of area to have a big affect.

Air ducted on to the oil filter probably is not doing much good, if the
filter had cooling fins it might help a little.

Dick Wampach SR-108

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
John W
Sent: Wednesday, August 20, 2008 10:05 AM
To: bobp@prosumers.ca
Cc: rebel-builders@dcsol.com
Subject: [rebel-builders] Elite Heat

Hi Bob,

Any suggestions on how to get the oil temp down on my Elite ?
Running at 22o on an 85 degree day.

I have enlarged the lower cowl bottom cutout to 1.25 the inlet in sq
inches- increased the scat hose cooling hose from the baffle from 1 inch
to 3 inches and redirecting it onto the oil filter ,swapped out the
Positec 7 row for as Niagra 8 row and have as of yet not achieved much
reduction (5-7 degrees)in oil temp.

Have a Stuart Warner filter but am resisting the firewall retrofit
until I am out of options?

Tks

John W




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[chileman88]

Dick
Baffling is tight, however maybe I have dispupted the cowl pressure with my mods. My Elite has the 0-320 cowl and there is very little room for air circulation. CHT run 370-415. Rear Front
John
------Original Message------
From: Richard Wampach
Sender: mike.davis@dcsol.com
To: rebel-builders@dcsol.com
ReplyTo: rebel-builders@dcsol.com
Sent: Aug 20, 2008 4:13 PM
Subject: RE: [rebel-builders] Elite Hi oil temp

The 1977 172N with the "H" series 160 HP came with a 4" duct from the
vertical baffle on the right side behind the cyls, down to the cooler
which was mounted to the firewall. It ran hot!
A factory mod was to move the cooler up and mount it to the vertical
baffle and eliminate the 4" duct. This reduced the oil temp by 20*F.

How hot is the Cylinder head temp? Having tight baffling is a must!
That is to say no place for air to by-pass the cylinder cooling fins.
Any air that by-passes cause a two fold effect on cooling. First that
air is not doing any cooling. Second it creates a reduced pressure
differential between the ram air in the intake plenum verses the low
pressure near the cowling exit. It only takes a combined few square
inches of area to have a big affect.

Air ducted on to the oil filter probably is not doing much good, if the
filter had cooling fins it might help a little.

Dick Wampach SR-108

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
John W
Sent: Wednesday, August 20, 2008 10:05 AM
To: bobp@prosumers.ca
Cc: rebel-builders@dcsol.com
Subject: [rebel-builders] Elite Heat

Hi Bob,

Any suggestions on how to get the oil temp down on my Elite ?
Running at 22o on an 85 degree day.

I have enlarged the lower cowl bottom cutout to 1.25 the inlet in sq
inches- increased the scat hose cooling hose from the baffle from 1 inch
to 3 inches and redirecting it onto the oil filter ,swapped out the
Positec 7 row for as Niagra 8 row and have as of yet not achieved much
reduction (5-7 degrees)in oil temp.

Have a Stuart Warner filter but am resisting the firewall retrofit
until I am out of options?

Tks

John W




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