External Transmission Cooler

[nubs]

Originally posted by ALsvx
BTW, do you use just a regular oil filter in the Permacool?

Bill

Yes,it comes with a filter.It is the equivalent of a Fram PH8A,which is the # most older Ford V8's used. I switched to a Fram PH43 which is a shorter version of the same filter used on Chrysler V8's

[lee]

Originally posted by nubs


Yes,it comes with a filter.It is the equivalent of a Fram PH8A,which is the # most older Ford V8's used. I switched to a Fram PH43 which is a shorter version of the same filter used on Chrysler V8's

I would be careful about this. The ATF fluid lines are under more pressure than is typically seen at an oil filter. I would probably pick a Mobil 1 or other filter than has a thicker metal housing, or just order in a filter from B&M or Summit just to be sure. That said, I don't use this type filter so this is really out there in the IMHO land and should be treated as such.

[nubs]

Originally posted by lee


I would be careful about this. The ATF fluid lines are under more pressure than is typically seen at an oil filter. I would probably pick a Mobil 1 or other filter than has a thicker metal housing, or just order in a filter from B&M or Summit just to be sure. That said, I don't use this type filter so this is really out there in the IMHO land and should be treated as such.

I really don't think this is an issue. I used a Fram filter for a year.Then when I changed my fluid the second time I switched to a Purolator filter. I have had this setup on my car for almost three years and have not had a problem.

The filters that B&M sells are probably just regular oil filters also.

[SVXRide]

The PermaCool comes with a filter and does call out a FRAM part # replacement (i.e., I think the answer is yes to your question).
-B
p.s. she wrecked your SVX and you still let her get behind the wheel of another car

[Andy]

Originally posted by Andy
I have just got my hands on a B&M cooler and permacool filter.

I have a reasonable understanding of fluid dynamics, and all things being perfect, series is the way to go.

My concern is that I have a '92. If the original cooler mesh becomes clogged, there will be no flow through the B&M either.

If I install in parallel, I have 2 chances of cooling my tranny fluid, but will the B&M be man enough to give sufficient cooling if it offers the path of least resistance?

Also, if the fluid is travelling through both coolers, as it must in a perfect situation, (ie if the B&M has half the resistance of the stock cooler, it will carry fluid at a ratio of 2:1 with the stock cooler) then the velocity of the fluid through the cooler will be reduced, extending its contact time in the cooler, and therefore increasing the operation efficiency of the cooler.

Does it therefore follow that the benefits of series-vs-parallel depend on the cooling capacity/resistance of the two coolers being used?

Also is the fluid pump, pressure or flow rated? (ie does it try to maintain a constant pressure or a constant flow rate?)

If the pump is 'flow rated' then series would be best as the pressure would be increased to compensate for the increased resistance of the two coolers, thereby maintaining the flow through them.

If the pump is 'pressure rated' then parallel would be best as the flow rate would increase to compensate for the lower resistance.

If the pump is 'constant rated' could it then follow that parallel must be best, as in series the flow rate will be reduced by the increased resistance.


(Series RT = R1+R2 )

(Parallel 1/RT =1/R1+1/R2 )

(Velocity = Pressure/Resistance)



Sorry, brain smoking, overload imminent, time to bail out

I had a chat with my mechanic about this.

His opinion was that the pump is almost certainly gear driven centrifugal. If this is the case, any increase in resistance (back pressure) would lead to a reduced fluid flow. If the coolers are fitted in series, the fluid flow therefore must be reduced, possibly by up to 50%.

In parallel, the fuid flow will be increased, thereby increasing the cooling effect. As the pump should be gear driven, the reduced back pressure will not have any detrimental effects on the pump as its rpm are not pressure dependant.

This scenario is reversed if the pump is electrically driven as the pump could compensate for changes in pressure.

(The mechanic it Janspeed trained, with many years of racing experience.)