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Removal of oil cooler

Started by alrg500, February 27, 2017, 03:05:20 AM

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alrg500

I know this isn't normal for an FJ but we have a FJ Engine that will only be drag raced so does not need the oil cooler, anyone know if its ok to blank off the inlet and outlet or will that cause oiling issues elsewhere in the engine?


Thanks

Pat Conlon

That's a question for Randy or Chris....

I understand that the FJ oil pump has 2 stages. 1 stage sends oil thru the oil cooler and 1 stage sends oil to the engine internals.
A thoughtful design, if you have an oil cooler line leak, you don't loose oil pressure on the engine side (until you run out of oil).
The Legend racers 'shim the oil pump' to provide higher pressure to send the oil thru longer oil lines and larger cooler used on the race cars.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

alrg500

Thanks for that info, sounds like blanking the oil cooler should have no detrimental affect on the engine oil supply then. hopefully Randy or Chris will be able to confirm.

Thanks

racerrad8

The oil lines have to be looped and cannot be blocked off unless you remove the oil bypass in the oil pan.

Robert - RPM
Randy - RPM

alrg500

Thanks Randy, so can I put a hole in the oil gallery where marked? would that not be the same as looping the outlet and inlet?  is that what you mean by remove an oil bypass?

What happens if the outlet is blocked does it over pressure the oil?


fj1289

Quote from: alrg500 on February 27, 2017, 01:09:57 PM
Thanks Randy, so can I put a hole in the oil gallery where marked? would that not be the same as looping the outlet and inlet?  is that what you mean by remove an oil bypass?

What happens if the outlet is blocked does it over pressure the oil?



I ended up going a slightly different route with my dragbike build.  I "dry blocked" it and ran the outlet for the oil cooler thru an inline filter and to the head for the cams.  In an FJ frame it is ridiculously tight for the fittings, but if you are using a dedicated drag chassis then you probably have plenty of room to work with. 

I THINK you can remove the spring loaded bypass just behind the area you highlighted to relieve the pressure if you aren't going to use the oil cooler output side of the pump.  BUT PLEASE CONFIRM WTH RANDY OR ROBERT FIRST!

alrg500

Thanks for that, hopefully that is all that is required, hopefully it can be confirmed.

racerrad8

Yes, remove the secondary oil pump bypass valve and you have the internal leak without any other modifications required.

See attached photo.

Randy - RPM
Randy - RPM

alrg500

Excellent, thanks very much will do that this weekend.