Boost+Carb

Ran fine until under a load. The pressure from the turbo overcame the gravity feed of the fuel from the tank and kept the fuel from entering the carb. hhhhhmmmm..... .. Installed electric fuel pump and that cured the problem.

If you run the wet charge (fuel and air mixed) through the turbo you will have to relocate the carb and that makes it difficult to connect the stock IH govenor. Also the turbo will have to be a sealed type designed for air/fuel mixutes. Running a box still has problems as the choke cable, govenor linkage and so forth are potential leaks. Nothing major just something else you have to contend with. Depending on how much boost you are planning on running, a few leaks may not hurt a thing and make actually be helpful in preventing over boost. The box is also a good place to mount a boost pressure releif valve.

The boost of the turbo is limited by the rmp of the turbo. The waste gate limits the turbo's rpm to prevent over pressures and explosions of the turbine and/or the compressors. If the boost pressure is kept moderate you may not even need the waste gate to open. BUT if the turbo is rather small for the application, then you may have to open the waste gate permanently to prevent destruction.

I would try mounting the turbo on the exhaust manifold by fabricating a mounting flange welded directly to a very short exhaust pipe. Plumb the pressurized air into the throat of the carb with new tubing. Use neopreme hosing where needed to connect everything.

Install a good electric fuel pump capable of producing more pressure than the turbo. You may have to put a variable pressure regulator in the system activated by vacuume to reduce fuel pressure or by boost to increase fuel pressure.

Good luck and let us know how it goes.

Actualy the engine doesn't turn enough rpm to spool the turbo up to it's true potential and really bring on the boost. But for pulling a bush hog through tough weeds and brush it does very well. It looses no rpm in a hard pull and the whistle of the turbo will get neighbors attention real quick!

Keep in mind that the Waukesha engines had a squirt type of oiling system for the rods. By tapping into the oil galley and placing a turbo in the system you will loose some oil pressure and flow. I upped the oil pressure to about 20 pounds hot at high idle. So far no problems.

My 1968 Chevy 250 straight six with a Garret Air Research turbo from a V6 Buick with an Edlebrock 4 bbl carb, water injection, manual-shift over drive transmission with the waste gate wired closed is a different story! :)