Home » Public Forums » GMCnet » [GMCnet] Oil Cooler
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| Re: [GMCnet] Oil Cooler [message #353477 is a reply to message #353472] |
Sat, 04 April 2020 07:03   |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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I am also working on a cooling solution for engine coolant/engine oil/transmission fluid as a result of a new engine and prior owner mods and solutions.
This Hayden page speaks to transmission cooler scenarios
https://www.haydenauto.com/en/technicians-resources/faq-transmission-oil-coolers
This page has more of their product line, and if you dig in, you see their heavy duty engine oil coolers have 1/2 inch ports, and most of the lighter duty and transmission have 3/8.
https://www.haydenauto.com/media/5475/oil-cooler-brochure_individual-pages.pdf
Other brands show AN8 for engine oil heavy duty, and AN6 for tranny and engine oil light duty.
My take on the cooler you linked to is that it is not sized internally for engine oil, but transmission fluid. Will it work? Probably EXCEPT a high stress/high flow situation like if it is hot day, overloaded, and a long steep incline. We need high flow in that situation.
I am going with an engine oil cooler for a mid 80's RX7 that you can search on ebay. $80-100 and mounting on the front frame. I will be using an inline or sandwich oil thermostat bypass, leaning toward inline as the sandwich does not really let much skip the cooler when cold. AN8 fittings into the cooler, and can reuse the OEM 1/2 inch hoses with some modifications. My new tranny cooler is internal with the radiator I chose, and I will use all metal 3/8 line to connect.
My two cents...
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: [GMCnet] Oil Cooler [message #353478 is a reply to message #353472] |
Sat, 04 April 2020 08:39 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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If you have a new radiator I do not see the need for an external oil cooler, unless that new radiator was in play when the engine failed.
The ebay oil cooler would not be my choice because from what I see it uses nipples for hoses/hose clamps. I would want to stick with a flair type connection or better high pressure hose/connections.
But maybe i am reading this wrong and this would be for a tranny cooler. If that is the case,
I think this looks like it would make a good tranny cooler.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
[Updated on: Sat, 04 April 2020 08:41] Report message to a moderator |
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| Re: [GMCnet] Oil Cooler [message #353480 is a reply to message #353478] |
Sat, 04 April 2020 09:20 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Are we looking for a better mousetrap here, or has your old one become
suspect because of a grenade-ed engine?
If that's the case, my advise to you would be to "DO NOT USE ANY PART
OR PARCEL OF YOUR OLD SYSTEM, particularly the in radiator cooler and the
lines to and fro.
I would personally stay away from aftermarket coolers not specifically
designed to cool engine oil, also.
But, it is your risk, your decision, your money. Spend it
intelligently. But, don't chase good money with more good money without
good reason.
Jim Hupy
Salem, Oregon
On Sat, Apr 4, 2020, 6:40 AM Jon Roche via Gmclist
wrote:
> If you have a new radiator I do not see the need for an external oil
> cooler, unless that new radiator was in play when the engine failed.
>
> The ebay oil cooler would not be my choice because from what I see it uses
> nipples for hoses/hose clamps. I would want to stick with a flair type
> connection or better high pressure hose/connections.
>
>
> --
> Jon Roche
> 75 palm beach
> EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Oil Cooler [message #353481 is a reply to message #353480] |
Sat, 04 April 2020 12:44 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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I used three of these on my install;https://www.summitracing.com/parts/bmm-70274
I use one for the trans in series with the radiator and two for the oil (with a thermostat) and no radiator heat exchanger. Nice unit. And they really work.
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
[Updated on: Sat, 04 April 2020 12:46] Report message to a moderator |
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| Re: [GMCnet] Oil Cooler [message #353482 is a reply to message #353481] |
Sat, 04 April 2020 12:57 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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We stock ad sell only these Plate style as it performs better than the tube.
One for trans is different than the Oil.
Keep in mind that it needs to be mounted at least one inch to the radiator
to have the fan pull through it at lower speeds and even hihg as air will
go around it more tha through.
On Sat, Apr 4, 2020 at 10:45 AM Hal StClair via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I used three of these on my install;
> https://www.summitracing.com/parts/bmm-70274
> I use one for the trans in series with the radiator and two for the oil
> (with a thermostat). Nice unit.And they really work.
> Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1975 Eleganza II, 101230,
>
> 1974 Eagle Bus 45',w/slideout,
>
> Rio Rancho, NM
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
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jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Oil Cooler [message #353489 is a reply to message #353483] |
Sun, 05 April 2020 07:37 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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Hey Larry,
Thanks for the pics link, I missed those earlier. Would you elaborate what caused the problem that possibly contaminated the RX7 cooler? Especially if it was a heat/cool related issue. Not sure if I am hearing correctly, did you put the 500 in, it failed after a period of time and you had to re-do?
Thanks
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: [GMCnet] Oil Cooler [message #353491 is a reply to message #353489] |
Sun, 05 April 2020 09:10 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Tilerpep wrote on Sun, 05 April 2020 07:37Hey Larry,
Thanks for the pics link, I missed those earlier. Would you elaborate what caused the problem that possibly contaminated the RX7 cooler? Especially if it was a heat/cool related issue. Not sure if I am hearing correctly, did you put the 500 in, it failed after a period of time and you had to re-do?
Thanks
HI Tiler,
Not heat/cool related. The Cad 500 has an unusual type of Rocker arm system. A "T" pedestal for each cylinder that has a rocker arm on each side of the T with spring steel clips that hold the rockers in place. One of those springs broke and the rocker arm fell off, pushrod came out, lifter popped out of it's bore, so oil pressure dropped to 0. That lack of oil did damage to rod and main bearings. Those bearing particles spread throughout the engine and the cooler. It is almost impossible to get all of the debris out of coolers. Not wanting to chance debris taking out my next engine, I had to scrap the RX7 cooler, the internal radiator cooler, and go to another cooling source. The story is longer than that so this is a condensed version, The whole story is not worth repeating unless you are considering a Cad 500 install.
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Oil Cooler [message #353497 is a reply to message #353492] |
Sun, 05 April 2020 11:53 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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Thanks Larry, and I know that was a frustrating sequence of events! I was going to put the rx7 cooler in the bottom of the radiator frame, but it was about 1/2 inch too tall, and that frame is already pretty exposed down there. So I am now working on putting it in the frame like you did. I have not found any with a built in thermostat like what you had. The Hayden 225 does not actually stop any oil from going to the cooler when cold, it only lets a little bit bypass the cooler when cold. I'm looking at the Derale 15719 style of inline thermostat. I took a picture of the Hayde 225 in my kitchen test of it:
http://www.gmcmhphotos.com/photos/data/7272/medium/S6300721.JPG
Mac, back to your original question, my thoughts on engine oil cooling: When we move the oil cooler external from the OEM style in the radiator, you significantly lower the absolute temperature it is exposed to: inside the engine radiator the lowest temp is about 135, air temp is ambient temp so way down to even freezing. Original design was constant, high flow, to a relative stable temperature exchange (inside the radiator). With an air cooled exchanger, we need a bottom limiter (thermostat) for cold situations, and retain the high flow for high load situations. That's why I'm going with massive cooler with a thermostat.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
[Updated on: Sun, 05 April 2020 12:09] Report message to a moderator |
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