mgreen84 said:Example: A local guy has a Dodge 360 ci in an XJ with lift and 35's. 750 CFM carb and Weiand intake, custom tube headers, and almost no firewall left. My 99 XJ still has the 4.0 and most of the common upgrades, same lift and tires (as his)and 4.10's.
I can wheel just as hard as him, mine runs cooler, mine is street legal(his can't even be insured due to firewall) and I have a FASTER acceleration, and loads more MPG. While its a great idea I tend to disagree and turn up my nose.
JJacobs said:The difference is you can't do much more to your 4.0 while the V-8 hasn't even scratched the surface. Mileage- point taken. There's no reason for the firewall to be out of it, what happened there?
xjbubba said:In my opinion, a "purist" would never mutilate the 4.0 by boring and stroking; they'd polish that "turd" until it gleamed, by blue-printing and balancing. The XJ came with a GM V6 at one time; the V8 is just a little longer. The problem with the V8, is the torque stresses the uni-body. If the bored & stroked 4.0 has any where near the torque of the V8, you'll have the same issues. The V8 (Chevy sb) is shorter than the straight 6, and the Vette V8's (aluminum) are lighter as well! The only real hassle is a proper radiator to cool the V8 (solvable), and you'd have the same issue with a heavily warmed over 4.0L--maybe worse, since boring an engine usually results in warmer running, and the XJ already runs hot in stock form. The only advantage I can see to "B&S'ing" a 4.0, is, you already have the engine and all the necessary goodies to make it run. But what about the puny clutch of the six? The starter motor? And the stock trannys will be hard pressed to live with the "500" HP your monster-six is going to make. You say the XJ wasn't "engineered" for a V8, well, the 4.0L wasn't "engineered" to put out 500HP. And, by the way, I'd like to see a normally aspirated, non-oxcided 4.0L+ that puts out that much horse power. Having built my share of "B&S'd" engines growing up, unreliability goes up by the square of the over-bore. That's the beauty of sliding in the Chevy SB, you get cubic inches with reliability. And if you really want to turn your XJ into a pretzel, there's tons of inexpensive after-market goodies for the Chevy; sky's the limit.
I agree, Just my opinion and someone gets hot and bothered, or winded and wired or something like thatren said:Ah, the old whizz contest- mine is better because....
Bah.
forcefed said:well i myself, will be starting my v8 swap in the next month or two.
ive had my 96 4.0 ho for almost three years. and i do agree that the 4.0 has decent low end power stock, although there were many reasons for me to not stroke it.
1. it is not a crossflow cylinder head, = not effecient. and will never be. but i would say it is adequate for our general use.
2. it is a heavy motor. considerably heavier, then most small block v8 actually.
a 500 horse 4.0, stroked or not, turbo or supercharged, could not be reliable, affordable, or efficient, you would end up with maybe a 15000 mile rebuild interval if your lucky, really lucky. and due to the non crossflow head, and intake air temps, it would require a much higher octane in order to keep from detonating. As far as gas milage, well that will depend on where you put your power band.
anyone here regret swaping to a v8?
fwiw all this comes from some one that used to build turbo rice burners, go figure....
if you are up for the fab, go for it i doubt you will regret it, if not, dont bother.