Warpman89 Posted October 21, 2007 Share Posted October 21, 2007 I have a 1988 R688ST with the E6 350 hp. Is there a cheap way to increase the power possibly by turning up the injector pump, or is that not recommended?Also, I have the 12 speed mack tranny, does anyone know what model # it would be?Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/ Share on other sites More sharing options...
Maxville Truck Posted October 21, 2007 Share Posted October 21, 2007 which injection pump do you have? Robert Bosch ??or American Bosch?? yes it is fairly easy to do, and only will cost your time... however 350 is about the max "reliable" continuous duty rating an e-6 should run at.... can you get more you bet you can, should you only if you want to do a rebuild sooner than you normally would. Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14601 Share on other sites More sharing options...
HK Trucking Posted October 21, 2007 Share Posted October 21, 2007 Also, I have the 12 speed mack tranny, does anyone know what model # it would be?TRTXL1070B Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14602 Share on other sites More sharing options...
fjh Posted October 22, 2007 Share Posted October 22, 2007 which injection pump do you have? Robert Bosch ??or American Bosch?? yes it is fairly easy to do, and only will cost your time... however 350 is about the max "reliable" continuous duty rating an e-6 should run at.... can you get more you bet you can, should you only if you want to do a rebuild sooner than you normally would.Anything much more than 350 and your pushing the limit.You also have to be carfull how much fuel you give it BECAUSE you can crack the block if you over fuel to much!And you will have nothing to rebuild, I have seen em crack at the sixth main cap from being over fueled!That is why the block was changed when the e7 came along The main caps were then bolted to the block thru the sides simular to V8 !The same block used right from the 250 to the 454 The eteck block is also built in this fashion!The New VOLMAC engine is a total diffrent animal More complex mor volvoized! Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14615 Share on other sites More sharing options...
Lmackattack Posted October 22, 2007 Share Posted October 22, 2007 try thisTrentMackMechfuelpumpadjustments.doc Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14627 Share on other sites More sharing options...
Warpman89 Posted October 23, 2007 Author Share Posted October 23, 2007 Thanks a Million man, that explains a lot! Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14629 Share on other sites More sharing options...
r600 Posted October 24, 2007 Share Posted October 24, 2007 try this=Trenttrent will this work on my 237???????? Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14662 Share on other sites More sharing options...
Lmackattack Posted October 24, 2007 Share Posted October 24, 2007 if you have the same pump it should.. be carefull as the 237 does not have any means to cool the intake air!!! watch the EGT guage closely! Quote Link to comment https://www.bigmacktrucks.com/topic/2991-e6-power-increase/#findComment-14680 Share on other sites More sharing options...
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