Dale, I have a 200-4R (but not in a Chevelle) and after talking it over with some engineer friends (they have thermodynamics backgrounds) we came to the same conclusion about the cooler line routing. Trans -> aux -> rad -> trans. I can't remember exactly which B&M cooler I have but it might be 1 step down from the 24K - maybe the 19K version? IIRC there are 2 coolers that're 3/4" thick and I bought the larger one.
As far as MPG goes I'm definitely seeing an increase with the overdrive, especially since I opted for a lockup version. However, I cammed and timed the engine with the OD in mind so the powerband is nice and low. I imagine it's certainly possible for an engine built for efficiency at higher RPM to run less than optimally at lower RPM. And while it might not make a difference for you, I like the idea of the auxiliary cooler taking a little bit of the load off the cooling system since the ATF's cooler when it reaches the radiator. Brad O. > I spoke with a guy tonight about building a 200-4R and he said something > that kind of surprised me. Even if you run an auxiliary trans cooler, > you should still run through the radiator connections as this helps to > warm up the trans fluid to help the seals. If you start anew on a cool > day (60� was his example), it takes the trans too long to warm up via > just the auxiliary cooler. Anyone hear of something like this? What > should minimum trans temp be? I think 200� is on the high end, but > what's low and what's optimum? > > I'm getting antsy to swap my M20 4-speed setup for a 200-4R but don't > have a trans cooler in the radiator. I bought a B&M 24,000 GVW Super > Cooler unit and now I'm told it won't warm up the trans fast enough? > > He also said that the O/D won't improve mileage to any degree. Somehow > I think reducing RPM's from 3000 or so at 75/80 to 2000 or so has to > improve mileage - am I wrong here? Currently I'm running 2100 at 55mph. > I find it hard to believe that I'm not using more fuel at 3000 RPM > (75/80 MPH) than I am at 2100 (55 MPH). With the O/D, I can run the > same 75/80 MPH at my current 55 MPH RPMs. > > Dale McIntosh _______________________________________________ Chevelle-list mailing list [EMAIL PROTECTED] http://chevelles.net/mailman/listinfo/chevelle-list_chevelles.net
