Lmackattack Posted March 3, 2008 Share Posted March 3, 2008 Do you need a special cam for a Jacobs engine brake on a 285 mack? Quote Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/ Share on other sites More sharing options...
Packer Posted March 3, 2008 Share Posted March 3, 2008 Nope!The Jake uses valves to operate, not cam lobes.Packer Quote Keep a clutchin' Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/#findComment-17334 Share on other sites More sharing options...
MACKS Posted March 3, 2008 Share Posted March 3, 2008 I'm pretty sure the 285 was built with the heavy duty cam for use with with a jake brake. Quote Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/#findComment-17336 Share on other sites More sharing options...
Lmackattack Posted March 4, 2008 Author Share Posted March 4, 2008 ok good just wanted to make shure before i go looking for one.ThanksTrent Quote Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/#findComment-17340 Share on other sites More sharing options...
fjh Posted March 4, 2008 Share Posted March 4, 2008 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! Quote Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/#findComment-17341 Share on other sites More sharing options...
RFC Posted March 5, 2008 Share Posted March 5, 2008 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. Quote Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/#findComment-17352 Share on other sites More sharing options...
CML Service Posted March 5, 2008 Share Posted March 5, 2008 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 Quote Link to comment https://www.bigmacktrucks.com/topic/3475-285-jake-brake/#findComment-17353 Share on other sites More sharing options...
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