Back when Barrett built my 390, there were fewer fuel injection choices. I wanted Airflow Performance, and elected to go with an FM-200, as Don Rivera had not yet invented the FM-150.
The early 390 uses the horizontal intake sump with an air plenum separate from the oil, and tuned length intake pipes. The mounting flange was sized for a Bendix RSA-5, meaning the diameter is 2-5/16". The FM-200 is larger, at 3-1/16" To mount an FM-200, Don created an adapter which necks down to the Bendix size. Here's a photo. The green gasket is the FM200 bore diameter. The hole is the RSA-5 diameter:
I've long told myself if I ever had a reason to pull the sump, I was going to mod the flange to eliminate the restriction. Well, recently an oil leak developed. Ahhh, an excuse!
First task was to machine a new flange from billet, same thickness as the adapter.
Weld the flange to the sump.
Weld in additional material inside the oil chamber...
...and under the chin, because....
...the next step is to fire up a die grinder with an aluminum hog and cut away the restriction. Need the extra material so the upper ramp can extend to the larger diameter at the original angle, and the lower side can be cut level with the plenum floor. A few dabs of high temp epoxy filled the previous stud locations.
Make a new gasket, bolt it up, go fly.
The early 390 uses the horizontal intake sump with an air plenum separate from the oil, and tuned length intake pipes. The mounting flange was sized for a Bendix RSA-5, meaning the diameter is 2-5/16". The FM-200 is larger, at 3-1/16" To mount an FM-200, Don created an adapter which necks down to the Bendix size. Here's a photo. The green gasket is the FM200 bore diameter. The hole is the RSA-5 diameter:
I've long told myself if I ever had a reason to pull the sump, I was going to mod the flange to eliminate the restriction. Well, recently an oil leak developed. Ahhh, an excuse!
First task was to machine a new flange from billet, same thickness as the adapter.
Weld the flange to the sump.
Weld in additional material inside the oil chamber...
...and under the chin, because....
...the next step is to fire up a die grinder with an aluminum hog and cut away the restriction. Need the extra material so the upper ramp can extend to the larger diameter at the original angle, and the lower side can be cut level with the plenum floor. A few dabs of high temp epoxy filled the previous stud locations.
Make a new gasket, bolt it up, go fly.
