What is a helicopter oil cooler

[Mukilteo911]

Was reading Bruce's book, where he mentions adding a helicopter cooler from the engine mounter oil cooler. States that people have seem good results from that type, better than the stock front mounted cooler.

Anyone have a picture or know what these are and where they mount?

[Joeaksa]

They are not that much better or differnet than the ones we have for our cars today. Years ago the aviation coolers were very good but these days the companies have improved their quality.

Here is one for a aircraft:
Personally I would go with a new good quality one by someone like Elephant (on this forum) that is a proven design.

JoeA

[304065]

It's just a phrase to describe an oil cooler shaped like a brick. Piston-engine helicopters, due to their ability to hover, can't necessarily rely on forward motion to cool the engine oil, so need a big cooler.

[Joeaksa]

Like John says, the cooler is bigger. Problem is that its going to be difficult to figure out where to fit that on a 911. The flat racing style of cooler will go under the bumper and get air ducted to it, or you can put one in the right front fender.

Unless you could find one about 3 times the size pictured above and mount it in the fender, you are going to be way undersized for what you need on your car.

Joe A

[john70t]

That sounded like a system where oil was showered like a sprinkler-head through a seperate stream of filtered circular air current to transfer heat. [edit]Upps, forgot this was corner carvers2, sprinkle and shake.

[Mukilteo911]

Cool thanks for the info. Interesting.

Why not put a newer radiator type like elephant under the rear fender, more room to scoop air to it than the front. Less modification to the chasis.

[Wil Ferch]

Ok....some of you are missing another crucial point made by BA...

OK...the helicopter units are smaller...and some say too small for our use. But we're "conditioned" to think that it's too small if it's placed in the same circuit it always was. But...it isn't.

Normally we install these on the scavenge side of the oil circuit. Either very low pressure or ( likely) an oil/air mix. Needs a lot of surface area. BA suggests the use of helicopter coolers on the * pressure* side of the oil circuit...like Porsche's early purpose-built race cars. The unit is then in a solid liquid stream of pressurized oil...and can be smaller to good use.

Right or wrong ?

Wil

[air-cool-me]

i want to go back and ask Hans why not the pressure side?

[svandamme]

Originally posted by Wil Ferch
Ok....some of you are missing another crucial point made by BA...

OK...the helicopter units are smaller...and some say too small for our use. But we're "conditioned" to think that it's too small if it's placed in the same circuit it always was. But...it isn't.

Normally we install these on the scavenge side of the oil circuit. Either very low pressure or ( likely) an oil/air mix. Needs a lot of surface area. BA suggests the use of helicopter coolers on the * pressure* side of the oil circuit...like Porsche's early purpose-built race cars. The unit is then in a solid liquid stream of pressurized oil...and can be smaller to good use.

Right or wrong ?

Wil

yeah , but that means ditching the built in oil cooler which is in the air flow of the fan

you win some air flow over the heads and cillinders
but you loose air flow over that alternative cooler

unless you have really big flares in the rear, and you can put the cooler in there... in front of the wheels,i don't see this as a more efficient solution over a front cooler

[304065]

Well, why not on the pressure side is, when you start car on cold morning at the racetrack and give the throttle a whomp you can blow up the cooler. Scavenge side has entrained air to absorb some of the pressure.

I know you guys use a thermostat, I don't.

[Mukilteo911]

But if the cooler is designed to handle the pressure, it should work.

Since I'm not in for another adventure at the moment and shall stick with the
frount mounted.