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Building a Jeep Comanche Truggy, 6.2 6.5 swap help

With too many choice the best thing is add even more options. Before I swapped from n/a to turbo I was going to just add propane. The only reason I didn't is I couldn't find a place to hold the tank I was happy with. (Now I have a lot of reserve for BBQ days with the extra tanks) Same power gains as a turbo, just the cost of the fuel. I helped a friend do propane on a 6.2 in a cucv, the truck had enough hiway time that the propane paid for itself in increased mpg. He is still running that rig with over 100k on that engine sipping propane daily. A lot of nay sayers on propane that have never tried it. So if running it n/a really gets old with not enough umph, do not give up as if its out of options.
 
Propane is in the works for me as well.

Will how did you control when propane was added on NA engine?
 
Burning oil said:
Post #103 http://www.thetruckstop.us/forum/sh...fold-group-buy&p=465595&viewfull=1#post465595

I've still got mine in the plans, but now I have my engine sold and will be buying a P400. Anyway could you do similar and point the exhaust forward? I used a Banks manifold and a van manifold.
Click to expand...

i need to read around in there looking for more pics... its possible... i need to set the motor back in and see if that front mount will clear my shock hoop or not... i believe it will and i dont have a battery there either so lots of room!

The only thing im confused about is the van manifold points forward as well?

Will L. said:
With too many choice the best thing is add even more options. Before I swapped from n/a to turbo I was going to just add propane. The only reason I didn't is I couldn't find a place to hold the tank I was happy with. (Now I have a lot of reserve for BBQ days with the extra tanks) Same power gains as a turbo, just the cost of the fuel. I helped a friend do propane on a 6.2 in a cucv, the truck had enough hiway time that the propane paid for itself in increased mpg. He is still running that rig with over 100k on that engine sipping propane daily. A lot of nay sayers on propane that have never tried it. So if running it n/a really gets old with not enough umph, do not give up as if its out of options.
Click to expand...


this is definitely something to look into... propane is not a uncommon fuel in the offroad world... did he have a build thread?
 
No thread. This was many years back before I ever heard of TTS. I tried to get him to take some pics and sign up here, but he is way too much of a tin foil hat to go online ever.

He bought electric controlled valves for NOS. For the orifice he took a 3/8" nipple, tacked in a plate, then drilled it with a small drill bit. We made 4 or 5 and he played with different size holes and pressures. The pressure is controlled by a regulator from a bbq, take the cap of and any propane or natural gas regulator is adjustable. Screw in for more pressure, out for less. A stronger spring increases the range of the regulator.

Most guys that add propane do it for massive power gains, he was just trying to keep up the numbers to make up for no turbo. I think that's why he has such long life from the engine.
 
I like the idea of small hp gain and a possibly large mpg gain.

I have a 45gal tank (from the 03 I bought from Leroy and replaced w/ 80gal) and the propane shop is 1/4 mile away.

My only concern is the control over throttle range. I'd like it to be smooth like normal throttle response.
 
Im still aways from installing mine, but basically the way it works is you have more power when on LPG so don't need to press the diesel fuel pedal as much. Your fooling in a way the diesel fuel system. But you are still burning another fuel so the MPGs are not as great as some people say because they don't tell you how much LPG they burned.
BUT! IMO its still a worthwhile mod because you can burn the cheaper fuel, have more power if needed, less soot in the oil and air.
For me going through the Rockies with a camper I think I'll be able to maintain a reasonable speed using LPG
 
Ill post pics either here shortly of what im running into or in the next few days... no easy way to do it from my phone... wife and baby on the way home so no tellin...

Real quick though...

The banks manifold wont work for me either... my shock hoops right in line... but i can go forward more...

will the passenger side van manifold also flip around??

Where did you find them?

And the tube you have attached with the matching flange... where did that come from??
Thanks
 
This is the XJ im maching everthing in... you can see if i didnt have shock hoops the banks manifold would actually work great... but i looked at both pretty hard and i think the turbo would be about dead center of my shock hoop on the forward side... HOWEVER thats why i asked about the vans manifold on the passenger side as well... because i can extend it forward about 3inches straight out and build my junction there for the crossover and turbo mount...
View attachment 43163
A shot of the little clearance my axle allows... the truss takes up a lot of space... but i think i can squeeze the exhaust output through there...
View attachment 43164
This is the space i have for the cross over which really is plenty... this is with the I6
View attachment 43165
and this is with the 6.5 but gotta erase the sway bar and steering bars since they dont exist on my MJ anymore
View attachment 43166
this is the gap with the 6.5 for me to run my exhaust out of
View attachment 43167

this is the area that would be wide open for the turbo to be placed... where the battery box is basically... also shows where my shock hoop is and how its in the way...
 
So i guess it would go on the passenger side but it looks like it has a angle to the outlet which screws me once again... if it was straight like the passenger side used on the drivers then i could have made them work...
 
Yes you can flip both the van manifolds around, driver side to passenger, and passenger to driver and this will point both of them foreword. But you have to find the right set. There is one set that the driver side wraps around the back of the head- wrong one.

I needed the whole set up-intake & exhaust manifolds, turbo, up pipes, injectors. So I waited for a van/van engine for sale. It took me about a 10 month wait and a trip from where I live (basically Las Vegas) to Phoenix Az. I paid way more than I would have for a regular 6.5TD engine, but rare = more $. No effin way I would do it all again.

Really consider custom made headers, you will be much happier with the results. The funny part is a better fab guy will charge less to build them, because more skill allows a faster build and less labor so a lower cost.

Sorry to have started the propane conversation here, didn't mean to derail your thread. Just trying to offer options for you, having been in the power lacking 6.2 , 6.5 realm for some time- both on and off road.
 
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