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Lmackattack

285 Jake Brake

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Do you need a special cam for a Jacobs engine brake on a 285 mack?

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Nope!

The Jake uses valves to operate, not cam lobes.

Packer

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I'm pretty sure the 285 was built with the heavy duty cam for use with with a jake brake.

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ok good just wanted to make shure before i go looking for one.

Thanks

Trent

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I'm pretty sure the 285 was built with the heavy duty cam for use with with a jake brake.

As matter of fact Trent your engine likly has a dynatard cam !the cams where basicly all the same . the jake is not much more if any more effective on a 285 than the dynatard, and a much easier install .Just rockers pushtubes and diffrent valve covers and the same wiring as the jake!

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I have a Jacobs on my 285. I'll take a Jake over a Dynatard any day. I've driven macks that had really weak Dynatards and some that were pretty strong.

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I'm pretty sure all Mack cams were compatable with Dynatard since the mid 70's. Dynatard is a much easier install with the tip fan intercooler. Dynatard also uses a switch actuated by the fuel rack so will not stall the engine. You could use that switch on a Jake also.

Chuck

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