Joe1091 Posted February 27, 2014 Share Posted February 27, 2014 Can i convert my thermodyne to a 237 by doing an inframe and add a turbo?? Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/ Share on other sites More sharing options...
theakerstwo Posted February 27, 2014 Share Posted February 27, 2014 What is the model and year engine. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234807 Share on other sites More sharing options...
kscarbel2 Posted February 27, 2014 Share Posted February 27, 2014 This question is a blast from the past. The Maxidyne head gasket used fire rings. So (if I recall correctly), you would have to cut grooves into the surface of your Thermodyne heads to accept the proper Maxidyne head gaskets.And as others have pointed out below, Maxidyne engines used shot-peened connecting rods. Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234808 Share on other sites More sharing options...
Joe1091 Posted February 28, 2014 Author Share Posted February 28, 2014 So the fire rings are in the heads not the sleeves or block? Its a 673 Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234911 Share on other sites More sharing options...
theakerstwo Posted February 28, 2014 Share Posted February 28, 2014 If it was a ENDT673b or c you could by replacing the liners with the maxidyn liner that will use the fire ring and cut the groves in the head plus change the fuel pump and maybe the injectors and turbo.Too much expense Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234917 Share on other sites More sharing options...
David Posted February 28, 2014 Share Posted February 28, 2014 Is the cam also different? Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234938 Share on other sites More sharing options...
doubleclutchinweasel Posted February 28, 2014 Share Posted February 28, 2014 A 673C might already be fire-ringed. I've heard they were, anyway.And, the C has the extra head studs, like a Maxi. Know that piece for a fact.Seems like we discuss this every so often, but I'm not sure it is ever 100 percent nailed down. Seems like a good candidate for the wiki... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234949 Share on other sites More sharing options...
fifth wheel Posted February 28, 2014 Share Posted February 28, 2014 The rods also, years back it was done around here, the rods had to be machined for the crank, change pistons, cam, injectors, cut heads, pump update, the cooled piston blocks were scarce. All said there were crank problems and the flywheel housing cracked and loosen up. Best to find a 237. FW 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234954 Share on other sites More sharing options...
doubleclutchinweasel Posted February 28, 2014 Share Posted February 28, 2014 The rods also, years back it was done around here, the rods had to be machined for the crank, change pistons, cam, injectors, cut heads, pump update, the cooled piston blockswere scarce. All said there were crank problems and the flywheel housing cracked and loosen up. Best to find a 237.FWYep. Best way to get a 237 is to just get a 237! I knew there were differences, but didn't know how many! I have a sneaking suspiscion that some of the "converted" motors were just about half-converted.A 237 is one of the most common motors out there. Shouldn't be too hard to find one.'Course, I'm still kinda fond of my 250-horse 673C. No, it doesn't have the low-end of the 237, but does have pretty good power up in the sweet spot. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234955 Share on other sites More sharing options...
theakerstwo Posted February 28, 2014 Share Posted February 28, 2014 The ENDT673C would have the low end torque if the governor was changed to the maxidyne setings. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-234998 Share on other sites More sharing options...
doubleclutchinweasel Posted February 28, 2014 Share Posted February 28, 2014 The ENDT673C would have the low end torque if the governor was changed to the maxidyne setings.true...true... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-235002 Share on other sites More sharing options...
fifth wheel Posted March 1, 2014 Share Posted March 1, 2014 At factory settings the 250 will use 8-10 gals more fuel in a day than a 237 doing the same job. FW Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-235050 Share on other sites More sharing options...
Bobby Covert Posted March 1, 2014 Share Posted March 1, 2014 No You Can't Quote Link to comment https://www.bigmacktrucks.com/topic/34831-convert-thermodyne-to-maxidyne/#findComment-235109 Share on other sites More sharing options...
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