Lowering oil temp

[vugbug68]

I'm on a mission to lower the oil temp of my 2109cc, I'm going to change one thing at a time and document the results. I posted a topic last summer when I pulled out the 2109 and installed my 1760 http://www.thesamba.com/vw/forum/viewtopic.php?t=632001&highlight=
I was surprised how much cooler the 1760's oil temp was.

Last month I drove my bug up to Portland (with the 1760) and had great oil temps for the whole trip, the only time it got high was going up the mountains between California and Oregon, hit 230 which is nothing to panic about.

Recently I put the 2109 back in with a few different parts on it, a 1-5/8" sidewinder and a different fan shroud which actually has more of a scoop to send air to the oil cooler than my other shroud. Well long story short, my oil temp is higher now than last summer. A short little freeway drive in 90* weather got it close to 250. First thing to change is the shroud.
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71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin

[Danwvw]

That's hotter than my engine gets in the Bus! You must have made it too high of compression for your camshaft or something, Does it have dual valve springs, Does it have external oil cooling. It's a DogHouse right! I don't have external cooling and oil temp is fine.
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1960 Beetle And 1679cc DP W-100 & Dual Zeniths!

[porkchop-rob]

Are all of the tins in place?

Doghouse ?

Cht?

Oil pressure ?
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1965 Beetle
1968 Beetle Baja (Son's First Car)
1976 Bus with Subaru (Wife's Riviera Camper)

[vwracerdave]

I lowered the oil temps 15* on my 2276 in the Ghia by covering the oil lines that pass thru the exhaust with a heat sleeve tubing. Aircooled.net sells it. So does Jeg's and Summit.

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[Eaallred]

Does one engine have stiffer valve springs than the other? That could account for the increase in oil temperature. Cam/lifter friction is the main contributor to oil heat.
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Eric Allred

You have to remember something: Everybody pities the weak; Jealousy you have to earn.

[74 Thing]

Different size crank pulley and alt pulley and a belt will do it as well.

Count the number of revolutions the alt turns with each revolution of the crankshaft. 2:1 or a little more helps a lot.

[Multi69s]

I went the opposite direction of racer dave. I wrapped my exhaust with heat wrap and saw a 20 degree drop.
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[vugbug68]

thanks for the replies, I got distracted with my 65 bug for a few days.

Yes the 2109 has dual springs and the 1760 has single hd springs. I was expecting the 2109 to run hotter but at least with my other shroud it stayed in the safe range unless it was 100 outside.

I'll put my other shroud on today, That is pretty much the only thing I changed since the last time this engine was in my car. I have an early doghouse on now and my other shroud is a late doghouse from a FI beetle. I went to the earlier shroud because it has a larger scoop that sends air to the oil cooler.

But somehow the other shroud cooled better.

My head temp is 300ish when cruising, that hasn't changed.
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71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin

[esde]

Add a velocity ring, it makes a difference
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[vugbug68]

[vugbug68]

I forgot to update this but I put my other shroud back on and my oil temp is about 30* cooler now, my head temps are pretty much the same. I guess VW made some significant improvements to the FI shrouds.
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71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin

[ps2375]

What weight oil is in each motor?

[CLKWRK]

"What weight oil is in each motor?" I think this is an important question ...

Try using the thinnest oil you can get away with while still respecting the "10 psi per 1000rpm" rule while warmed up, this will help oil temp because the oil cooler bypass circuit uses oil viscosity to detect a cold engine condition and bypass the oil cooler.
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[mark tucker]

"B" sure you got the wide fan in it. and..Ive seen some shrouds with that slot open wide and some closed up I bend them open so they scoop/collect/redirect the air better.
so is the temps the same as the 1760 now? or??
Ive also seen some shpruds that the dog house portion was spot welded to but leeks air like hell.I use polyurathane to seal them up good all the way around, and be sure you have the hoover bit thingy in there .I made somethen else to seal the shroud to the cooler. also some shrouds dont fit the cooler snug and nobody seems to use sealing foamtape to seal it so the air dosent go around the cooler. there are lotsa places to improve the cooling system. I dont know if there is a driver side hoover bit type of thingy or what but I like to try to seal that side too as there is a gaping open spot in that aera too.I dont run the brest plate or the other one so I dont know if that open portion is sealed off from the engine compartment or not....although I think thats not really heated air, or just wasted air. lotsa peices&parts I need to look at when I put my 356 togeather.
gladd you got it cooler, atleast that tells you the motor isant fixen to go south on your northbound trip.

[74 Thing]

What shroud did you put on that ran cooler? Was it your FI shroud? Besides the velocity ring what else was different (ie is the air scoop that goes to the oil cooler different then the one on the primer colored shroud pictured above)?

Thanks

[vugbug68]

The shroud that was on my 1760 was the FI shroud which is now on the 2109. The shroud that I initially had on the 2109 was an earlier doghouse without the velocity ring but with the scoop like in the picture.

The 1760 had Rotella 15-40 synthetic blend during the hot summer months and maintained 10-12 psi per 1000 rpm @ 210* oil temp.

The 2109 has Delo 5-40 synthetic, It has higher oil psi than the 1760 even when my oil was @ 245* it still had 10-15 psi per 1000 rpm, I've noticed the 2109 has about 50 psi on the freeway at 3800 rpm with the oil at 210* F

With the other shroud on the 2109, my oil temp wouldn't level out, it would keep rising and wouldn't be able to cool down very much at idle, the FI shroud will cool the oil more when coming to a stop after a freeway cruise.

So far I'm pleased with my temps and how the engine is running
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71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin

[ps2375]

I'm running a 5-30W synth in my 2087 with hydro lifters and still plenty of oil press.

[[email protected]]

50psi at 3800 is too much pressure. Try 10-30 or 5-30 next.
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[esde]

I've been using the velocity rings on everything where temp might be an issue, and it really works. It was worth a 20º drop on the engine in my split bus, with no other change. That's with a shitty 36hp doghouse style aftermarket shroud, and no thermostat or flaps
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modok wrote:
Bent cranks are silent but gather no moss. I mean, ah, something like that.

[74 Thing]

Which FI shroud did you put on?

From this link (1/2 way down on the first page) there are two versions-the early one with a scoop and the later version with a peanut shaped hole for the cooler.

http://www.thesamba.com/vw/forum/viewtopic.php?t=4...mp;start=0