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Old 07-09-2011, 12:50 PM   #1
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CDI or Cummins 4b??

Hey all! I am ready to begin thinking about considering an Engine Swap in my '90 YJ. I really like the idea of a CDI set up but have neither looked for or found one. I'm just looking for some initial advice, ideas, and experienced insight. Any posts and comments are appreciated.

A Cummins Mech friend of mine of course is up-talking a mechanical set-up of the 4B(Cummins inline four-cyl diesel motor), but I wanted to see if anyone else has thought about or done a CDI swap.

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Old 07-11-2011, 09:59 PM   #2
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Originally Posted by P-villeYJ View Post
Hey all! I am ready to begin thinking about considering an Engine Swap in my '90 YJ. I really like the idea of a CDI set up but have neither looked for or found one. I'm just looking for some initial advice, ideas, and experienced insight. Any posts and comments are appreciated.

A Cummins Mech friend of mine of course is up-talking a mechanical set-up of the 4B(Cummins inline four-cyl diesel motor), but I wanted to see if anyone else has thought about or done a CDI swap.
I would first ask for some details on the Jeep. Such as tire size, transmission, intended use?
Mercedes has always made good engines especially diesels. Albeit some were gutless but they lasted forever. The issue I see with a CDI is mating it up to a drivetrain that will work in a Jeep. After that you will need a complete wiring harness and all associated computers for it to run. Interfacing MB electronics can be challenging. Another option would be a mechanical OM617 but it too has some hurdles. The biggest I can think of is the front sump oil pan.
4bt is another mechanical engine, reliable, noisy, vibrates a lot, good aftermarket and OEM support.
VW TDI would be a good engine for a commuter vehicle.
6bt will fit but it is way overkill.
2 stroke Detroit 3-53, big, loud, leaky, awesome

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Old 07-12-2011, 12:02 PM   #3
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Haven't heard much about TDi, but being a VW guy I like the sound of that. I have no intentions of building a beast. Just something cool, and super reliable, with good to awesome MPG. Thanks for the input....
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Old 07-12-2011, 12:12 PM   #4
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The TDI is very light by diesel standards, albeit low on power in stock form, but they have been known to be souped up nicely. The light weight will help your power to weight ratio, and reduce the need for bigger heavier axles. The VW PD diesels are similar to the CDI as far as complexity of interfacing.
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Old 07-12-2011, 12:28 PM   #5
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Another option is the Cummins b3.3 depending on what state you live in because its not intended for motor vehicles. I believe the turbo model is 85hp with 215 lbs torque, this is what I would like to put in my YJ.
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Old 07-12-2011, 01:41 PM   #6
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Ah yes the 3.3 I meant to include it in my list above but it was late and I fell asleep.
Another good engine, but it too is heavy.

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