Jeep Tornado engine

Infobox Automobile engine
name=Jeep Tornado
aka=6-230


manufacturer=Kaiser-Jeep
IKA
production=1962–1981
predecessor=Willys Super Hurricane
successor=AMC Straight-6 engine
type = straight six
bore = Auto in|3.34375|0
stroke = Auto in|4.375|0
displacement = 230.5 in³ (3.78 L)
block = Iron
head = Iron
valvetrain = SOHC
power = convert|140|hp|abbr=on at 4000 rpm
133 hp at 4000 rpm
specpower = 0.61 hp/in³
0.58 hp/in³
torque = convert|210|ft.lbf|N.m|abbr=on at 1750 rpm
199 ft·lbf at 2400 rpm
compression = 8.5:1
7.5:1The Jeep 6-230 Tornado engine was the first U.S. designed mass-produced overhead cam (OHC) automobile engine. It was introduced in mid-year 1962 and replaced the flathead 6-226 Super Hurricane, which had been in use since 1954. It is still the only engine designed, developed, and built by Jeep and used only in Jeeps.

The Tornado, like most Jeep engines, was undersquare for better low speed torque. It had a convert|3.34|in|mm|sing=on bore with a convert|4.38|in|mm|sing=on stroke. The standard version had an 8.5:1 compression ratio. Output was convert|140|hp|abbr=on at 4000 rpm and convert|210|ft.lbf|N.m|abbr=on of torque at 1750 rpm. A low-compression (7.5:1) version was also available, with convert|133|hp|abbr=on at 4000 rpm and convert|199|ft.lbf|N.m|abbr=on of torque at 2400 rpm.

The Tornado was a good engine, unfortunately it was complex (by 1960s standards) and was discontinued in civilian vehicles in the U.S.A. in 1965. It continued to be used in military versions of the Jeep pickup, the M-715 and M-725, until 1969. One unique feature of the design was that the camshaft only had six lobes. One lobe operated both the intake and exhaust valve for each cylinder. This made engineering cam profiles a bit more difficult than conventional two lobe per cylinder (one per valve) designs, but allowed the valves to be better arranged for the cross-flow head. Valves were directly opposite their respective ports, and ports were short with wide radius turns.

Production of this engine continued in Argentina by Industrias Kaiser Argentina (IKA) after 1965. The engine was used in Jeeps and in the Torino, a local version of the American Motors (AMC) Rambler American/Rambler Classic hybrid that was built in Argentina from 1966 to 1982. IKA was eventually bought out by Renault, but the Torino and the Tornado engine continued to receive upgrades over the years.

The engine name was changed to "Torino" to match the car in 1973. It also received a major block and crankshaft refinement that year -- seven main bearings instead of the original four. In 1975 "IKA" was dropped from the company name and it became simply "Renault Argentina". The Torino (car and engine) continued production through 1982. From 1976 to 1982 it was the only non-Renault designed car made by the company.

It was used in the following vehicles:

* Willys Jeep Truck 1962-65
* Willys Jeep Wagon 1962-65
* Jeep Gladiator 1963-64
* Jeep Wagoneer 1963-64
* Kaiser Jeep M-715 1963-69 (military only)
* Kaiser Jeep M-725 1963-69 (military only)
* Renault Torino, also known as IKA Torino, 1966-82
* IKA produced Jeep vehicles 1966-78(??)