Case LP turbo

[SAMBO]

I"m needing some help in finding the right turbo for a LP case 930 and a few minor details about what work needs to be done to the motor.Also will it work as a blow through system. I"m going to pull farm stock and want to turn a few heads looking for around 20psi of boost any help will be greatly appreciated thank you

 

[mEl]

The turbo should be sized by someone who has the formulas to do it properly, the RPM range desired, cubic inch displacement, boost desired and even the flow efficiency of the engine are taken into account. Blowthrough has its problems as carbuerators are not designed to work in that mode, fuel pressure has to be increased as boost increases or fuel flow to the carb will stop when the pressure inside the carb increases due to boost in the bowl. As boost comes up the engine just shuts off from lack of fuel I did this years ago and found that pulling through the carb is lots less of a problem. However the proper blower for this application will be equipped with a compressor seal to keep from pulling oil from the turbo bearing area. I can get you to a man that will help you with your sizing and even the hardware needed, is your email open? mEl

 

[Anonymous-0]

Blowing through an LP carburetor is the best way to go. Just put a balance line from the carburetor to the vent on the regulator. The carb and regulator already have taped fittings for this. The only other thing you have to do is increase the first stage pressure on your regulator to be more than you boost pressure.

 

[SAMBO]

Do I need any sort of different camshaft for this, and can i use stock head gaskets and my email should work thanks

 

[Ian Johnsen]

I have a propane turbo tractor, and blowing through a propane carb is fine. They are sealed much better than a gas updraft carb. A stock LP set up is regulated around 14 PSI, and therefore a mild boost set up is around those numbers anyways. Blowing through a gas carb has issues with balancing the pressure in the float bowl. Float bouncing and crushing is hard to control, and fuel always blows out around the sloppy throttle shaft. Stock cams work well with turbos. Most performance cams will have to much overlap and will decrease the boost potential. Run a hose from your boost pipe to your regulator. This will be your fuel management as it will increase fuel pressure during boost. You may want to look into a mechanical LP carb. IMPCO carbs use vacuum diaphragms and springs to control air/fuel ratio. A mechanical Century carb(like I run) has a butterfly for air and a barrel valve for fuel. There is a linkage between the two for quick air/fuel adjustments. No pulling the carb apart. I would strongly recommend running a blow off valve on your boost pipe. This valve is closed during boost, but then when you close the throttle at the end of the track, your intake manifold switches from boost to vacuum, and the valve opens up and releases all the remaining boost pressure from the boost pipe and therefore saving abuse to your carb, and the potential to backspin and destroy your compressor shaft. You may also find that your stock regulator may need to be upped in size. If you cant make enough boost, you may need more fuel. An MSD or similar ignition box would be a good idea. With boost you could "blow out" your one spark, so multiple sparks are better. Also propane is on aveage around 114 octane detenation is less likely under boost. Hope this helps, Good Luck.