Amc Jeep Torque

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Amc Jeep Torque
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For the 1971 model year, General Motors mandated that all of their divisions design their automobiles to operate on unleaded, low-leaded, and low-octane regular gasoline. GM made the change in response to increasingly restrictive emission requirements as well as anticipation of the catalytic converter, which would require unleaded fuel, that they would begin using in 1975.

The market felt the ramifications of this decision most with models that offered muscle packages. In order to allow for the usage of low-octane fuel, GM lowered compression ratios on engines to at least 9:1, which was well below the 10.25-11.25:1 range used in high performance engines recently. For muscle cars like the 1971 Chevelle, this meant less power since the horsepower for the big block options fell sharply.

In one exception, Chevrolet was able to give the LS-5 454 an advertised horsepower increase to 365, but this was little consolation to most muscle fans. For one, the 5-horsepower increase was more marketing than anything else because that engine in the 1971 Chevelle peaked 600 rpm lower than the one included in the 1970 model. In addition, torque was down approximately 35 pound-feet.

The savior for this bleakness was to be the much-heralded LS-6 454-cubic-inch engine. Expectations were that the 454-cid LS6 would produce an impressive 425 horsepower at the modest compression ratio of 9-0.1. That was something to get excited about at least, but with the introduction of the 1971 Chevelle there were no signs of it. There were promises of a mid-year release, but the mid-year came and went with little fanfare other than the hydraulic lifter option for the basic SS package.

One of the bright spots for the 1971 Chevelle was its basic Super Sport (SS) package that really brought a lot to the table for approximately $360. This equipment included a blackout grille, wider tires, 15-inch five-spoke wheels, power front discs, and an F41 suspension with front and rear stabilizer bars. All Chevelles for 1971 got the single headlamps that had premiered on the all-new Monte Carlo a year earlier, and this provided a great look for the Chevelle SS especially in combination with the optional racing stripes and cowl induction hood.

Chevelle SSs with the 454-cubic-inch engine got an external engine ID insignia that read "SS 454". This was in line with how Chevrolet had designed the Chevelle badges over the years. However, as a sign of the times, all of the basic SSs included simple badge that simply read SS. There wasn't a lot boast about in those lesser SSs, at least under the hood. Even today, the 1971 Chevrolet Chevelle SS 454 remains the crown jewel of that model year, and it is the one that most enthusiasts target.

Weighing in at 4,000 pounds with a 112.0 wheelbase, Chevrolet built just approximately 9,500 SS 454 units. The 454-cubic-inch V8 under the hood has a compression ratio of 8.5:1, but manages 365 horsepower at 4800 rpm and 465 pound-feet of torque at 3200 rpm. Representative performance in 1971 was 0-60 mph in 6 seconds, and a quarter-mile in 14.35 seconds with a top speed of 97 mph. The base price back in 1970 was approximately $4,000, but enthusiasts will find it difficult to find at that price today even in poor condition.

Dan Legal is a member of the web team that runs the website LemonFree.com. LemonFree is a car search engine which currently has over 2 million new and used cars for sale. If your trying to locate a 1971 Chevelle For Sale; trust LemonFree to help you find your next car today!

The 4.0L Jeep Wrangler Engine

The 4.0L Jeep Wrangler engine had a fantastic horsepower compared to it's predecessors and peers. The 6-cylinder Jeep Wrangler engine offered excellent acceleration and torque for an engine of it's size. The engine was engineered by American Motors Corporation (AMC), and was based on the Typhoon Six which was introduced in 1964. The 4.0L Jeep Wrangler engine featured a shallow-skirt cast-iron block with uniformly spread out cylinder bores, a seven-main-bearing crankshaft, loop-flow combustion chambers, and in-line valves. The 6 cylinder engine boasted 180 horsepower when placed in a Wrangler, and 190 horsepower when placed in a Jeep Cherokee.

Beginning in 1991, the Jeep Wrangler engine used Chrysler engine processors, allowing for stress-free diagnostics. Between 1996 and 1998 changes were made to subdue sound, shaking, and harshness from the 4.0l Jeep Wrangler engines, together with a different cam lobe profile to cut valve seating speed, isolated valve cover fastenings, and adding a main bearing brace.

 

The 4.0L Jeep Wrangler Engine performed well, with few caveats. There were a few problems with the basic design, including sparatic leaks; the oil pump was infamous for wearing out at around 140,000 to 160,000 miles, and the TPS (throttle position sensor) on the '89 and '90 models was inadequate at best. Be sure to have around 30 pounds oil pressure at idle (give or take 5 lbs). The main reason for abandoning the 4.0l Jeep Wrangler engine was the oldness of the engineering parts. The pressurized coolant surge tank generally developed pin-head leaks, and there are alternatives which will work better at cooling.

 

The engine also can develop deterioration as a result of the cooling system. The original Renix injectors have an inclination to leak. If you suspect or detect a leak, it would be a good idea to replace your injectors with Five-O Motorsports' Jeep injectors. If you experience oil leakage from the rear of the engine, the o-rings that seal the oil filter mount have most likely deteriorated. They are Nitrile which have short life spans. Substituting the o-rings with 70 Durometer Viton rubber resolves the problem.

When AMC decided they wanted to better their engine line, they made a decision to abandon the 4l altogether. To entirely retool would have been almost as expensive as upgrading the 3.7 liter engine did, and time is money. Rather than being pragmatic, money reigned supreme as they were told to, "Make a modern engine, and junk the old ones." Since then, engines have become progressively more efficient and a new 4.7l long block engine was released, a powerful upgrade for the 4.0L Jeep Wrangler Engine. The engine ups the ante to somewhere near 265 hp to 290 lb.-ft of torque, and is designed to fit Jeeps fitted with the 4.0L Jeep Wrangler Engine from 1991 to 2006.

About the Author

A 2003 4.0l Jeep Wrangler with a manual transmission gets an average of 18 miles to the gallon on the highway, 15 mpg in the city. The same jeep could accelerate from 0 mph to 60 mph in 10 seconds and can reach a top speed of 108 mph. Considering that the 2003 jeep commander engine weighs over 2 tons, those are pretty good times!

What is this part [image] on a Jeep CJ7?

I just bought a CJ7, but I'm missing this cover of the torque converter.

http://img189.imageshack.us/img189/1772/th400.jpg

It has a specific name, but I don't know what it is! It's a 78 CJ7 with an AMC TH400 automatic transmission. Does anyone know the name of this part??

torque converter/flywheel cover

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