Root Moose
NAXJA Forum User
- Location
- ON, Canada
xjbubba: Awesome! Thanks for posting pics.
SBC swap. A little confused.
- Thread starter DirtyMJ
- Start date
KSXJ
NAXJA Forum User
- Location
- Kansas City
maybe this guy can elaberate more or get some more pictures before it sells of this XJ with a 454.
http://www.naxja.org/forum/showthread.php?t=931164
http://www.naxja.org/forum/showthread.php?t=931164
Root Moose
NAXJA Forum User
- Location
- ON, Canada
Apparently I can't keep engine numbers straight.
Modern GM engine numbers:
http://en.wikipedia.org/wiki/Chevrolet_Small-Block_engine
http://en.wikipedia.org/wiki/GM_LS_engine
http://en.wikipedia.org/wiki/GM_Vortec_engine
Modern GM engine numbers:
http://en.wikipedia.org/wiki/Chevrolet_Small-Block_engine
http://en.wikipedia.org/wiki/GM_LS_engine
http://en.wikipedia.org/wiki/GM_Vortec_engine
xjbubba
NAXJA Member # 1524
- Location
- santa barbara, ca
Torque is all about cubic inches.
It takes a lot of "up-grades" to get the 4.0 to equal a 5.7.
Stock 5.7: (carburated) 9.5:1 compression; 343 FT Lbs at 1750 RPM, 375 Ft Lbs at 3500 RPM, 342 Ft Lbs at 4250.
Stock '06 4.0: (MPFI), 120 Ft Lbs at 1600 RPM, 235 Ft Lbs at 3200 RPM.
My stock 4.0l couldn't hold a candle to my stock 5.7.
The 4.0L is just fine for rock crawling, and cruising unloaded. Add all the weight from a moderately built rig, and, "poof", there goes on-road performance and gas mileage, especially when loaded down for camping.
As I added toys to my XJ, and the weight went up, my mileage dropped from ~22 to 16!!
As far as I'm concerned, I now have my cake and eat it too.
No more grinding up Calif mountain grades in the "truck" lane--now I can run with the "big boys", and still get 20+.
The swap wasn't easy, and, considering the cost of a second engine, it wasn't cheap.
Of course, Chrysler was all wet putting the 318 and 360 in the Grands.
It takes a lot of "up-grades" to get the 4.0 to equal a 5.7.
Stock 5.7: (carburated) 9.5:1 compression; 343 FT Lbs at 1750 RPM, 375 Ft Lbs at 3500 RPM, 342 Ft Lbs at 4250.
Stock '06 4.0: (MPFI), 120 Ft Lbs at 1600 RPM, 235 Ft Lbs at 3200 RPM.
My stock 4.0l couldn't hold a candle to my stock 5.7.
The 4.0L is just fine for rock crawling, and cruising unloaded. Add all the weight from a moderately built rig, and, "poof", there goes on-road performance and gas mileage, especially when loaded down for camping.
As I added toys to my XJ, and the weight went up, my mileage dropped from ~22 to 16!!
As far as I'm concerned, I now have my cake and eat it too.
No more grinding up Calif mountain grades in the "truck" lane--now I can run with the "big boys", and still get 20+.
The swap wasn't easy, and, considering the cost of a second engine, it wasn't cheap.
Of course, Chrysler was all wet putting the 318 and 360 in the Grands.
DirtyMJ
NAXJA Forum User
- Location
- Prince George, BC
You guys like to argue things... At least XJbubba got me some decent pics.
XJbubba, did you remote the oil filter for clearance reasons or just so you could run a cooler? Got the dimensions of that rad on hand?
I'm probably going to drop the truck 1-2" in the front. Nothing is set in stone, since I haven't come up with a definate plan on anything. Or even purchased a chassis to work with. But I know I want it AWD, and I don't want it lifted. Gonna build me a truck to haul ass on the twisties and hopefully blow the doors off the imports at stop lights... Oh, and I'm trying to make it as light as possible, like 3000lbs or less. Do-able? Maybe, maybe not, I've got a few ideas.
I can get a LS1 for about $2600 to my door. A buddy picked one up last week for his YJ thing. They're very tempting instead of a LT1 or any other iron block chevy. Especially because you can spit at them and make 400 ponies. Dunno what a LS6 goes for, but that'd be a decent idea too, especially if it was only a few bucks more.
I don't remember if SBC headers fit the LS series engines, actually I'm pretty sure they don't. Which might make life a little harder.
I'm getting the feeling this is one of these scenarios where I should just stop asking questions and go get a chassis and a mock-up block and start trying things.
XJbubba, did you remote the oil filter for clearance reasons or just so you could run a cooler? Got the dimensions of that rad on hand?
I'm probably going to drop the truck 1-2" in the front. Nothing is set in stone, since I haven't come up with a definate plan on anything. Or even purchased a chassis to work with. But I know I want it AWD, and I don't want it lifted. Gonna build me a truck to haul ass on the twisties and hopefully blow the doors off the imports at stop lights... Oh, and I'm trying to make it as light as possible, like 3000lbs or less. Do-able? Maybe, maybe not, I've got a few ideas.
I can get a LS1 for about $2600 to my door. A buddy picked one up last week for his YJ thing. They're very tempting instead of a LT1 or any other iron block chevy. Especially because you can spit at them and make 400 ponies. Dunno what a LS6 goes for, but that'd be a decent idea too, especially if it was only a few bucks more.
I don't remember if SBC headers fit the LS series engines, actually I'm pretty sure they don't. Which might make life a little harder.
I'm getting the feeling this is one of these scenarios where I should just stop asking questions and go get a chassis and a mock-up block and start trying things.
Root Moose
NAXJA Forum User
- Location
- ON, Canada
DirtyMJ said:
They don't, LS engines have evenly spaced exhaust ports. That said, I'd be surprised if you can't get what you're looking for wrt dump placement.
Do some reading at ls1tech.com - lots of good stuff there.
If you're going to go through all the effort of making it work, I wouldn't even consider buying motor mounts. They are stupid simple to make and will allow you to put the engine exactly in the position you want and build them to give you the most clearance for other goodies (headers, steering...)
Same thing with radiators, these aluminum motor swap specific radiators some places sell are outrageous $400-500+. With some research through parts books (get to know a halfway decent parts counter guy) you can find one that will fit the area you want with the correct inlet/outlet. Granted you'll probably have to fab up some new mounts, not rocket science though.
Good luck and if you go this route, post up pics!
Same thing with radiators, these aluminum motor swap specific radiators some places sell are outrageous $400-500+. With some research through parts books (get to know a halfway decent parts counter guy) you can find one that will fit the area you want with the correct inlet/outlet. Granted you'll probably have to fab up some new mounts, not rocket science though.
Good luck and if you go this route, post up pics!
DirtyMJ
NAXJA Forum User
- Location
- Prince George, BC
Nobody hold their breath, I decided to link the front* and the rear of the trail MJ. So this project wiill be second page at best (gotta find a body donor and a whole whack of parts anyways)
(*if you are saying 'hey, it already had a linked front', no, it didn't, it had leaf springs)
(*if you are saying 'hey, it already had a linked front', no, it didn't, it had leaf springs)
