therabbittree Posted January 14, 2012 Share Posted January 14, 2012 Like the title says, any input on a big cam4 in a B73?..the radiator should cool fine..issue may be the trans holding ?...looking at a 20 speed quad box.. Any infor or advice would be great!.Thanks,Deo Quote Keep on keeping on... Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/ Share on other sites More sharing options...
David Posted January 14, 2012 Share Posted January 14, 2012 I do know the 855 is about six inchs longer than a Mack engine. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98009 Share on other sites More sharing options...
Rob Posted January 14, 2012 Share Posted January 14, 2012 Without gouging out the cab and forming a doghouse I'm not certain it will fit. I haven't been around the "L" style cab and it may be different but it's gonna be tight any way it's attempted.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98011 Share on other sites More sharing options...
miro Posted January 14, 2012 Share Posted January 14, 2012 If the big cam 4 has low flow cooling that could be a problem fitting a rad. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98012 Share on other sites More sharing options...
dirtywhiteboy Posted January 14, 2012 Share Posted January 14, 2012 theres a b-61 with a 400 big cam 3 in truck paper,..so it can be done Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98044 Share on other sites More sharing options...
Rob Posted January 14, 2012 Share Posted January 14, 2012 theres a b-61 with a 400 big cam 3 in truck paper,..so it can be doneI couldn't find it anyplace but would like to see what they did to the cab to make if fit; and have to work with it.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98047 Share on other sites More sharing options...
Bollweevil Posted January 14, 2012 Share Posted January 14, 2012 If the big cam 4 has low flow cooling that could be a problem fitting a rad. Like the man said BC4 has low flow cooling It won't work as configured, with your radiator. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98050 Share on other sites More sharing options...
mowerman Posted January 14, 2012 Share Posted January 14, 2012 i would buy an old beater cabover mack,,and pull out the drive line,,allot easier,,besides your quad box wont handle that much power..good luck.bob Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98053 Share on other sites More sharing options...
David Posted January 14, 2012 Share Posted January 14, 2012 What would need to be done to resolve the cooling problem? Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98063 Share on other sites More sharing options...
Superdog Posted January 14, 2012 Share Posted January 14, 2012 The radiator won't work,the lo-flo radiator is a completely different animal.I run a Big Cam IV everyday in my Superliner,and I've been fighting cooling issues since I got it.I just got ahold of a Big Cam III with a bad crank and I'm going to swap everything over on the cooling system,I'm told this will cure my problem.Otherwise it will fit fine physically,855 Cummins engine have been swapped into B73/75's alot.You'll want to go with a different trans. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98102 Share on other sites More sharing options...
David Posted January 15, 2012 Share Posted January 15, 2012 Mike, What is the difference in the radiator? Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98145 Share on other sites More sharing options...
other dog Posted January 15, 2012 Share Posted January 15, 2012 your quad box wont handle that much power..good luck.bobyou're right about that Bob. Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98156 Share on other sites More sharing options...
Bollweevil Posted January 15, 2012 Share Posted January 15, 2012 Mike, What is the difference in the radiator? On the big cam 4 both engine inlet and outlet, are plumbed into the top radiator tank. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98199 Share on other sites More sharing options...
David Posted January 15, 2012 Share Posted January 15, 2012 Is that considered the "low flow"? What happens if you plumb the suction to bottom. Is there any difference in the radiators? We are installing a BC4 in a DM865 and now wonder if the orginal radiator is going to work. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98204 Share on other sites More sharing options...
Superdog Posted January 15, 2012 Share Posted January 15, 2012 For one thing the hoses are alot smaller,almost like heater hose.There is a restriction plate in the radiator also,so I'm told.I'm taking the radiator out of a E9 powered truck to replace mine when I make the conversion. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98229 Share on other sites More sharing options...
miro Posted January 15, 2012 Share Posted January 15, 2012 (edited) The low flo rad has a baffle plate in it and the cooling flow goes from the top to the bottom and back up to the top so that it actually goes through the rad twice. This was a very troublesome feature on these engines. Cummins actually had a kit to change the cooling to single pass but very expensive. If you're going to buy a BC3 to change things over its easier to put the 3 in. Or put an early N14 in Edited January 15, 2012 by miro Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98241 Share on other sites More sharing options...
therabbittree Posted January 15, 2012 Author Share Posted January 15, 2012 Miro, the N14 idea sounds neat.. I was checking out a B73 and figured if the NH855 already fit the other cummins would also fit... as i have a friend with a few extra 855's i think they were all high flow. either way looks like th ebest bet to have cummins 855 and big power would be to swap the trans out too.. lots of work..might pass on this truck ... looking for a truck i can swap to a dump body on and off, possible quick change set up..so a triaxle tractor would be best... liked the heavy specs, as gross weigh with dump trailer would be upwards of.. 107k gross with permit.. for local dump trailer work.. always liked the b models and wish I didn't sell my B81.... Quote Keep on keeping on... Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98243 Share on other sites More sharing options...
Rob Posted January 15, 2012 Share Posted January 15, 2012 What is the difference in the engine with this Big Cam IV from the others?Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98253 Share on other sites More sharing options...
Bollweevil Posted January 15, 2012 Share Posted January 15, 2012 What is the difference in the engine with this Big Cam IV from the others?RobEngine inlet housing is different, and I suspect the thermostat housing also. Water pump should be the same. The thermostat housing is part of the first section of the water rail, so you would have to check for fitment with the second second section. Another consideration is the plumbing for the oil cooler. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98265 Share on other sites More sharing options...
Rob Posted January 15, 2012 Share Posted January 15, 2012 Engine outlet housing is different, and I suspect the thermostat housing also. Water pump should be the same. The thermostat housing is part of the first section of the water rail, so you would have to check for fitment with the second second section. Another consideration is the plumbing for the oil cooler.I've never been around Cummins engines, just Mack and Detroit, (two strokers). Doesn't sound like a simple parts swap for a novice to convert.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98269 Share on other sites More sharing options...
KidNV Posted January 15, 2012 Share Posted January 15, 2012 you most likely will want a 350 small cam FFC engine (full flow) like from a 72/3/4 truck.. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-98286 Share on other sites More sharing options...
dirtywhiteboy Posted January 23, 2012 Share Posted January 23, 2012 big cam III forulma 400 is the best cummins if you can find one,..the even rar'er formula 475 with tuned exhast an twin turbo's would be the ultimet!! Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-99210 Share on other sites More sharing options...
MidniteMechanic Posted January 23, 2012 Share Posted January 23, 2012 None of the cooling system is interchangable between the BC 3&4. BC 4's are a pain, better to find a BC3. Quote Link to comment https://www.bigmacktrucks.com/topic/22659-any-input-on-running-a-big-cam-4-in-a-b73/#findComment-99232 Share on other sites More sharing options...
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