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Most powerful AMC/Chrysler I6


kro10000
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A guy named Barney Navarro tried for several years to run the Indy 500 with a supercharged AMC I-6. That was a long time ago, and I don't recall ever seeing any horsepower claims for the engines.

 

Then there was the guy who took two of the 199 c.i.d. versions and hooked them up in-line for an I-12 engine in a dragster ...

 

Here we go:

 

http://www.hemmings.com/mus/stories/200 ... ure16.html

Navarro also chose an engine that had never before run in the Indianapolis 500--the Rambler overhead-valve 199-cu.in. six-cylinder, due both to its strong bottom end and thick cylinder walls. Navarro built both a fuel-injection setup for the engine and a variety of single- and double-turbocharger setups, eventually wringing in excess of 600hp from the little six-cylinder engine. According to Herman, Navarro tried to qualify at Indy with some form of that engine for three years, starting in 1968, but never actually qualified due to problems with drivers and with the suspensions of the cars.

 

http://wps.com/AMC/Navarro-turbo-motor/

At this point, it appears that I have the 1967 single-turbo motor, or a version thereof. Navarro made three attempts at a qualifying car based upon the Rambler six for a customer. The first was in 1967, had a single turbo and apprently produced 550 hp at 6000 rpm. Later motor(s) had twin turbos and 640 to 700 hp, depending on who you ask.

 

http://www.navarroengineering.com/about_barney.html

Navarro attempted to get one of his cars qualified for the Indy 500 for three years in the late 1960’s when handling and driver problems kept the car off the starting grid. The powerplant was a twin turbocharged 199 cubic inch Rambler engine with mechanical fuel injection designed by Navarro which put out over 700 horsepower.
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The 199 c.i.d. is a not-so-distant relation of our 4.0L. The basic engine that evolved into the 4.0L was first introduced by AMC as a 232 c.i.d. (3.8L) engine in the 1964 model year, in the full-size Rambler Classic passenger cars. For 1966, they added a destroked version of 199 c.i.d. (3.3L) displacement for the Rambler American line. Then in 1970 they dropped the American and brought out the Hornet and Gremlin. I think it was that year that they raised the deck height of the engines. The old 232 became the 258 (4.2L), which lived on right up through 1995 in the Jeep YJ Wranglers. The 199 was dropped and with the increased deck height became the "new" 232 (3.8L).

 

The neat thing is that ALL of these engines share the same basic block, bore spacing, and crank journal size and spacing. So by mixing and matching cranks to blocks you can create a variety of odd displacements. This is what makes the 4.6L "stroker" versions of the 4.0L possible.

 

IIRC, the 199, 232 (both versions) and 258 all used the same bore, and just varied the stroke to change the displacement.

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I thought the last year for the 258 in the YJ was 90? IIRC in 91 it got the 4.0 HO. I have a friend with a 95 YJ and I'm pretty sure she's got a 4.0 HO.

I'm sorry -- you are correct. 95 was the last year of the YJ, but it did change over to the injected 4.0L in 1991.

 

Sorry.

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