Cali conversion oil cooler

[bushoarder]

I’m running a Cali conversion in my early busamd I took a lot of time fitting the type 4 into the type 1 shroud. My initial thinking was that a bigger cooler must be needed.

Thinking more, is it possible that the type 1 cooler is more efficient because the air speed will be quicker due to a smaller chamber around the cooler than the type 4 with type 1 shroud.

Anyone have any data or info either way?


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[patto]

Surprised Next Gen hasnt popped up here as he has said the type1 cooler is more then enough on a type4 conversion! Wreck also seems to have good information based on his use in hot climates. Hopefully one of them chime in?

[wreck]

I haven't any first hand experience with stock oil coolers in a doghouse set up . I would've thought the bigger type4 cooler would cool better, what the airflow difference through the coolers would be I don't know . There are a lot of different things that contribute to oil temp . A bus will always require more cooling than a bug because of the extra power levels required to push it along at the same speed .

[H2OSB]

As soon as he sees this he'll chime in, but he's said it many times, and even to me personally. The T1 oil cooler cools more than enough for a T4 in an upright configuration, per Joe Cali.

H2OSB

[cal 67]

The T4 cooler in the T1 shroud will net about the same temperatures as a T1 cooler because the duct and possibly the fan can only flow enough for the smaller T1 chamber. So do whichever you want. Or pop off the duct, space it out 1/2-3/4” and tack it all back together. Then enlarge the duct entrance next to the fan. Then it might flow more.

[bushoarder]

All good feedback, thanks.

I enlarged the shroud between the fan and cooler, but I think you’re right 67.

The fan is the same and at a given speed wont flow anymore. My thinking was that as the flow exits the fan it will expand more since I enlarged the volume and thus the speed will drop making the cooling efficiency of the type 4 not as good as you’d think.

Does that logic seem sensible? I’ve seen a few people say a t1 cooler works fine - perhaps the cooler / shroud are the things to keep constant and just sticking bigger coolers in doesn’t work. Putting an external cooler (as I have done) is the solution to get increased cooling capacity if needed. I’ve only done that as we cruise around on motorways a fair bit and it keeps temps in the fully laden bus at c 100c.

Other options are to do stock type 4 cooling or go back to a t1 cooler in a proper stock fanhousing and not the aftermarket 30 horse types.


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[NextGen]

Guys sorry it took so long to get back to you guys I was out of the country for a while on my 50th anniversary. Was in Barcelona, Spain.

A lot of my saying a T-4 cooler is was do to many other guys testing the T-4 cooler in not only T-4 cars but also T-1 cars. Not many more rows of of oil cooling tubes on a T-4 cooler to make much of a difference. Also because I assumed due to the larger engine being cooled by a T-1 fan housing I thought the engine would overhead. BIG WRONG!!! In a bug the T-4 is hardly working. I had problem reaching 170 f oil temp. A 90c Thermostat took care of that. The warmest I get on a 90f day doing 70 mph for hours is 210 max. And that without some missing sealing rubber on both sides of my duel Dells.

So I sold over $600 of oil cooler and braided hose and sandwich adapt or at a swap meet. T-1 and T-4 cooler seem to make little difference in a Cali Style Upright conversion.

That said like any thing else. Over sized engines need more cooling. The Bug I am running now has 120 hp and is fine. Guys in Europe run 160 hp with a Cali Style, No problem. I heard larger but cannot verify. .

Buses are different they need all the help they can get. I would think if you are having issues with the stock coolers, and you have my manual or not, just screw on a Sandwich plate adapter with a 170f thermo built in and run and extra cooler.

[bushoarder]

Thanks joe, this engine was built for my 03 German looker originally and has ended up in the bus!

We got 83hp from an 1800 with 40 idfs and a 4-1 exhaust!

I’ve done as you said joe and spin on sandwich plate with thermostat in.





Nice short oil hoses and it seems to be working ok.


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[NextGen]

Nice work, all you can do except, to put the bus on a diet, ha. Just don't over load it.