Oil heat exchanger

[bones]

I was wondering if any one has got any details/part numbers ect of a light weight oil/water heat exchanger that could be used on a gyro to cool the oil temp, i believe the mangni's use this type of system.

[birdy]

????????
Wots rong with the one you got?

[bones]

nothing apart from the fact that oil is getting over 110* now, so was going to put one of these little fellas in there cause the water is only like 85, so it should drag the oil back down to it.

[birdy]

Cooler CHTs wont make buggerall difference to the oil temps ona 912 Bones, coz theres buggerall oil that passes through the heads, and thats the only thing the coolant cools.
Better airflow to the existing oil cooler is the best/cheapest option.
Hows it setup now?

I have trouble keepn the oil temps up in my machines, even in summer.

[Mike G]

Bones try this, Magni use the C43-182 model. It'll also heat the oil up faster on a cold day.

http://www.opcon.se/www/files/laminova/pdf/Aftermarket.pdf

Birdy I think Bones is talking about a cooler that uses the water from the radiator to cool/heat the oil.
Mike G

[Mike G]

Bones
These photos show a Magni installation. These might not be the latest arrangement they do, but the principle is there.

Mike G

[birdy]

One reason why rotax have seperate oil and water heat exchangers is so you can manage the indervidual temps.
The oil needs to get to at least 85c to prevent any condensation contamination, and the water, well, the colder the better.
If you have them at the same temps, youll loose the advantage.

[Mike G]

Birdy
I'm not convinced that the Rotax runs any better with cold water, usually I would expect engine designers would run all their calculations (and tests) at a "normal" temperature nearer 100°C. Running colder probably doesn't get the air fuel charge to the expected temperature. That may not apply to the 914 because the blower heats up the charge and cooling it prior to going into the cylinder would give you increased mass flow. All this is supposition since I don't know how the Rotax was designed.

Mike G

[birdy]

Im no spurt either Mike, but who else has the same cooling setup as Rotax?
And how many are getn 100 hp from a natural breathn carbed 1200cc [ ??] motor?

After cooled turboed engines get cooler air than non cooled turboed ones, and the power difference is soley coz of the cooler air entering the chamber.

[Mike G]

Birdy
I agree with you, sucking in cold air should always give more power than sucking in hot air. However there must be a minimum acceptable inlet temperature to the engine otherwise you wouldn't need the choke to start on a cold day.

I've also just noticed, if you look at the photo where you can see the cylinder head covers you can see the by-pass thermostat that we talked about on another thread.

Mike G

It must be getting late for you what time zone are you in?

[birdy]

It must be getting late for you what time zone are you in?
Its nite time, and theres plenty of stormy wether about, so im not sleepn. ;)