propane turbo build

[motoman426]

Well I have figured my propane has done pretty good I am going to go to the next level and inject some propane through a turbo and see how that does. I am going to mount up a brand new 4bd2 turbo off a Isuzu NPR. I am going to have to fab up a down pipe so I had one of my buddies cut me a plate and I am going to fab up a down pipe for it and as far as hookling it to the stock manifold I had him to put me a manifold plate and I am going to weld a piece of exhaust in between and flare the top to bolt up to the factory manifold. I am waiting on the rest of my propane parts to get here to start the fabing of the propane and intake tubing up because I am going to have to figure out how I am going to mount the propane throttle body I will get some things fabed up and add some pics hopefully by the end of the week

 

[GLTHFJ60]

 

[Mace]

Sweet

 

[CruisinFJ60]

oh good a reference thread for mine, only i would somehow like to keep my header which would place the turbo under the truck, no big deal if i can keep it up out of the way.

 

[ntsqd]

I've seen and read of guys using steel sched 40 formed elbows to fabricate turbo exhaust manifolds for all sorts of different engines, even some semi-exotics. Seems like the biggest challenge there would be the flange.

 

[Mace]

mine was built with preformed steel elbows.. getting the exhaust manifold hooked to the turbo is the biggest deal.

It's not that bad really.

 

[Tapage]

X2

it's there any such ARF to take care in a propane turbo setup . ?

 

[motoman426]

What I am going to do is flare a piece of exhaust and put my stock connection with the gasket in and weld the pipe to the flange I had made. As far as the down pipe I had a flange cut and I am taking a piece of 3" or 3.5" exhaust and mashing it to it is oval with a 90deg and welding it to the flange I should have that stuff built by friday I hope work has been busy.

 

[ntsqd]

The closer that you can get the turbo to the exhaust ports, the more effective and responsive it will be. That's not to say that it won't work 2 feet further down the exhaust system, just that it will be less than optimum. Turbo's work on more on heat, and not so much on volumetric flow. So keep the exhaust as hot as possible upstream of the turbo.

 

[GLTHFJ60]

The closer that you can get the turbo to the exhaust ports, the more effective and responsive it will be. That's not to say that it won't work 2 feet further down the exhaust system, just that it will be less than optimum. Turbo's work on more on heat, and not so much on volumetric flow. So keep the exhaust as hot as possible upstream of the turbo.

Until a point, right? Isn't the rule of thumb to not exceed 1200*?

 

[Mace]

that is an overfuel issue with Diesels, not as important with gassers..

 

[landcruiserjunky]

This makes me regret selling my propane setup a year ago...

 

[Tapage]

that is an overfuel issue with Diesels, not as important with gassers..

gassers have a limit .. let's say you can go up to 1800 or 2000°F if you keep AFR aceptable ?

 

[motoman426]

well got the plate welded up to the factory flange and I will hopefully get it mounted up tomorrow and get my oil lines run then all I have left is mounting my propane differently it is going to look funny but I figured exactly where to put it I may fab that bracket up tomorrow if my new propane pieces come in.

 

[motoman426]

landcruiserjunky if you want another propane set up I have another one to go on it I am taking mine apart and I have everything that will bolt up for you all you have to do is run the propane lines and water lines

 

[GLTHFJ60]

well got the plate welded up to the factory flange and I will hopefully get it mounted up tomorrow and get my oil lines run then all I have left is mounting my propane differently it is going to look funny but I figured exactly where to put it I may fab that bracket up tomorrow if my new propane pieces come in.

That exhaust flange is a bit warped man.

landcruiserjunky if you want another propane set up I have another one to go on it I am taking mine apart and I have everything that will bolt up for you all you have to do is run the propane lines and water lines

I would be all over that if my truck wasn't a DD.

 

[motoman426]

well got the turbo mounted up today I am taking my exhaust flange and going to have me a down pipe made. I will get the water lines run and the oil supply lines made up tonight and install them monday. I will go buy a couple 2" silicone boots and some pre bent piping for the intake and the supply to the turbo. I am going wheeling next weekend so should have it done I hope by Wed and get it dialed in. As far as the flange being warped it has been like that a while it still seals up so I dont really worry about it.

 

[Mace]

Pretty much exactly how mine is set up.

Your oil return can dump directly into the oil pan.

Take a air chisel with a pointed tip. Lay it up against the oil pan. Pop a hole in the pan. Thread hole for NPT threads.

Piece of cake.

 

[motoman426]

well I actually thought about taking the pan off and drilling it and welding it in buit your way does sound a lot better. I dread having to put a new throttle cable in but we will see how imy mixer is going to set up

 

[GLTHFJ60]

I'm interested to see how you are going to mount the draw-through setup. That's the one part I cannot picture in my mind. How are you going to support it?