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Posterino 3 4 4 Cylinder Engines
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The 151 (2.5L) inline 4 engine was used in '80-'83 CJsincluding the CJ-8, CJ-7, and CJ-5. The 151 is often calledthe 'Iron Duke', but is actually a Pontiac engine designed toreplace the Chevy 'Iron Duke' I4 engine. The engine does havethe Chevy bell housing bolt pattern though. The engine is manufacturedby GM and uses a cast iron block and cylinderhead with hydraulic lifters and 5 main bearings. The 151 cetainly isnot a screamer, the AMC I4 has much better HP and torque ratings.
Just after the piston moves to the bottom of its travel (bottom dead center), the cylinder bore contains the maximum air-fuel mixture possible. The intake valve closes and the piston returns back up the cylinder bore. This is called the compression stroke of the 4-stroke engine process. The air-fuel mixture is compressed between the piston. Engine firing order is also standard: l-3-4-2 (Ccylinder) and l-5-3-6-2-4 (6-cylinder). Rocker arms are retained on individual threaded studs. A ball pivot valve train is used, with camshaft motion transferred through the hydraulic lifters to the rocker arms by pushrods. The 4-cylinder crankshaft may be supported by 4 or 5 main bearings; the 6. Brian Cooley runs down his top five powerful peg legs.
The neat part about the engine is it has the same bell housing boltpattern as a Chevy small block. The bell housing makes a great lowbuck Ford/Jeep to Chevy adapter since it is basically Ford on thetransmission side and Chevy on the engine side. A regular Chevybell housing will bolt to the 151, so if you plan a transmissionswap, a Chevy transmission would be the way to go. Also, a Chevy305 or 350 will bolt right to the Iron duke bell housing. The downside of dropping in a V8 is most transmissions used with the IronDuke are light weight units.
The GM 151 has the intake and exhaust manifolds onopposite sides of the cylinder head, but the AMC 150has the intake and exhaust manifolds on the same side of thecylinder head. The picture at the top of the page is thepassenger side with the intake manifold and carb. Airmail 3 6 50 – powerful minimal email client. The driversside is pictured below with the exhaust manifold removed.
GM 151 | |
---|---|
Bore x Stroke | 4.00' x 3.00' |
Displacement | 151 ci(2.5L) |
Compression Ratio | 8.2:1 |
Horsepower (net) | 82@4000 |
Torque (net) | 125@2600 |
Main Bearings | 5 |
Valve Configuration | OHV |
Fuel | Rochester staged 2bbl |
Posterino 3 4 4 Cylinder Engine Rebuilders
Contributors
Thanks to David Ewing for the manifold identification tip.Thanks to Ed Lowe for keeping my GM engine history straight.