Offshoreonly.com - Oil and PS Cooler

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- Do It Yourself, Boating on a Budget (https://www.offshoreonly.com/forums/do-yourself-boating-budget-249/)

- - Oil and PS Cooler (https://www.offshoreonly.com/forums/do-yourself-boating-budget/357654-oil-ps-cooler.html)

duplera

11-13-2018 06:48 PM

Oil and PS Cooler

Removing a mostly stock 502 mpi and replacing with a a built 555 making 650 ish HP.

Question is reusing the stock cooler that’s on the old motor now ( mercury ) or go aftermarket?

Baja Rooster

11-13-2018 07:25 PM

You definitely want bigger and my guess would be at least a 3x18” but give Mr. Cool a call and he could spec it out. I can’t stress enough to go big and put a thermostat on it. I had to reinvent my system a couple times as I upgraded power and it is the biggest pain in the arse and expensive. Oversize and use a thermostat.

ph1971

11-13-2018 07:34 PM

10 or 12 qt pan won’t hurt either.

getrdunn

11-13-2018 09:52 PM

If interested I've got two 3" x 19 1/2" engine/ps combo in the swap. Very clean inside and out. Were cooling 700 hp engines with no problems what so ever.

DiamondPerformance

11-14-2018 06:32 AM

If your looking for new - Oil Coolers :: Engine Oil Coolers / Oil Systems :: Diamond Performance Parts

AllDodge

11-14-2018 09:08 AM

Have a 530HP 509 in a very heavy boat. Went from 8x2 which was roasting the oil, to 18x2 which could not run for more then 15 minutes cruising before oil was getting to hot. Changed to 2.75x18 and now I can run all day and WOT without issues. Don't have a thermostat, but the guys above have the answers for you, mine is just some info

Have a separate small cooler for PS and it has been fine though out

liquidlounge

11-14-2018 01:32 PM

Quote:

Originally Posted by Baja Rooster (Post 4658870)

Oversize and use a thermostat is good advice. I may be in the minority here, but Mr. Cool is so-so advice.

Baja Rooster

11-14-2018 02:03 PM

Quote:

Originally Posted by liquidlounge (Post 4658993)

Oversize and use a thermostat is good advice. I may be in the minority here, but Mr. Cool is so-so advice.

Actually my service with Mr. Cool was very so-so. I’d either look at John’s in the swap shop, who is a solid seller who won’t give you junk, or Diamond Performance for new as they support us here and have only heard great things about them.

Tahoe540

11-14-2018 04:31 PM

I have a 555 with about the same HP and use the thermostatically controlled unit from Diamond. Have had no issueshttps://cimg5.ibsrv.net/gimg/www.off...6b85c26183.jpg
https://cimg6.ibsrv.net/gimg/www.off...625df86ada.jpg

duplera

11-14-2018 05:04 PM

Great thanks gents for the replies . Have a 10 quart canton marine pan on the motor. Will defiantly be getting a bigger cooler

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