Mocal vs Tilton oils cooler pumps, One better than the other? Options

[pcar916]

I'm adding a cooler and pump to my transmission. These two pumps are similar in specification and both companies have been around a long time.

Tilton: http://www.summitracing.com/parts/TIL-40-524/

Mocal: http://www.racerpartswholesale.com/product...ial_Cooler_Pump

I know several of you run Jabsco Water Puppy pumps, but I see no advantage to it over the Mocal or Tilton.

Anyone out there with experience as to whether one is more reliable than the other?

[pcar916]

You could do it if you ignored squirters on the gears, and perhaps used the drain and fill plugs for in and out of your fluid after the fluid was drained.

But with some finesse, you can take the transaxle out without taking the motor out. Then you can install brass/bronze bosses for your cooler system elsewhere on the case.

If you decide to install squirters, don't make the mistake of pointing the oil flow into the mesh areas of the gears and R&P. That makes for huge forces pushing them apart as they try to squeeze the oil out from the mesh.

[stownsen914]

If you decide to install squirters, don't make the mistake of pointing the oil flow into the mesh areas of the gears and R&P. That makes for huge forces pushing them apart as they try to squeeze the oil out from the mesh.

I have heard this elsewhere, and am interested knowing why it matters. If you look at a the oil level in a stock 901, the gears mesh very close to that point. It seems like the oil would be carried into the mesh area by the rotation of the gears. Why is it any worse to spray oil under modest pressure where the gears mesh?

Scott

[pcar916]

If you decide to install squirters, don't make the mistake of pointing the oil flow into the mesh areas of the gears and R&P. That makes for huge forces pushing them apart as they try to squeeze the oil out from the mesh.

I have heard this elsewhere, and am interested knowing why it matters. If you look at a the oil level in a stock 901, the gears mesh very close to that point. It seems like the oil would be carried into the mesh area by the rotation of the gears. Why is it any worse to spray oil under modest pressure where the gears mesh?

Scott

The level is lowered during running since a lot of it is up in the gear train and on the top and sides.

Most of the oil is spun off anyway and a thin film is all you want. If oil is forced into the mesh a lot more oil can't spin off fast enough, and can't compress either, so the gears are forced apart more than they were designed for. With the R&P, this means at the very least, that the carrier bearings are loaded more than they should be. The other gears would be the same, higher bearing loads.

I don't know if it would be enough to break teeth, but it would certainly run hotter... and cool is good.

At worst I suppose a mag case could be compromised. This might make a difference in an early 915 case with a 2-piece bearing plate and an un-reinforced side cover. I have two of those transaxles. No racer would use them use them without the updated parts, but someone else might.

[stownsen914]

If you decide to install squirters, don't make the mistake of pointing the oil flow into the mesh areas of the gears and R&P. That makes for huge forces pushing them apart as they try to squeeze the oil out from the mesh.

I have heard this elsewhere, and am interested knowing why it matters. If you look at a the oil level in a stock 901, the gears mesh very close to that point. It seems like the oil would be carried into the mesh area by the rotation of the gears. Why is it any worse to spray oil under modest pressure where the gears mesh?

Scott

The level is lowered during running since a lot of it is up in the gear train and on the top and sides.

Most of the oil is spun off anyway and a thin film is all you want. If oil is forced into the mesh a lot more oil can't spin off fast enough, and can't compress either, so the gears are forced apart more than they were designed for. With the R&P, this means at the very least, that the carrier bearings are loaded more than they should be. The other gears would be the same, higher bearing loads.

I don't know if it would be enough to break teeth, but it would certainly run hotter... and cool is good.

At worst I suppose a mag case could be compromised. This might make a difference in an early 915 case with a 2-piece bearing plate and an un-reinforced side cover. I have two of those transaxles. No racer would use them use them without the updated parts, but someone else might.

If this is true, then does it mean that there isn't any point in having a spray bar? It would seem that passive sloshing of oil would be the preferable lubrication method ...

Scott