snowcombine
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Posts posted by snowcombine
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Yeah I could, but 400 powered R models with the old style hood aren't real common. The ones I have seen are all new style hood R with a 20000# front axle(kinda heavy for a tractor) or are ch models. So I may have to do a bunch of work to get what I want.
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Have been thinking about this for a while. I looked through almost all of the pages regarding engine swaps. If I understand correctly a mechanical e7 350 or 400 will replace an e6 without too much trouble providing the front of the engine has the right configuration. So I was thinking could I put an e7-400 with a t2180(that is the model # for an 18sp right?)into my 1980 RD685 with 38000# 4.42 rears. Would the rears handle it or would I need 44s? there is an 89 R model with 44s coming up at an auction but I haven't seen it yet. Would the 89 be a better choice for this kind of swap? The biggest loads I pull are a triaxle double drop hauling my farm equipment between farms(up to 100,000lbs. max) and a five axle super b grain trailer (140,000lbs gross). I currently pull this with a 435 horse 3406e cat. Would I miss the 35hp and 100lbs of torque?. Have thought about finding a superliner with an e9 but would rather have a regular R model if I could.
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Mike; Certainly no offence taken. I definitely do understand your frustration with shows and "hey everybody vote for mine" BS that goes on. Our local car club has figured out a way around it that has been working well. Like the other guys said I'm not into shows the truck is just a workin' machine. Parts aren't really a problem partly because it doesn't get many miles and doesn't break down! As for being my favourite, It runs smooth, pulls the load well(I even hauled 140,000lbs once, a bit much but it did OK)The cab doesn't rattle near as much as our other trucks, doors close with a gentle push. I just use it for what it is meant for. Besides, it's as close as I will probably get to having a vintage heavy truck.
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finally got around to getting a picture of our truck on here. It's a 1980 RD685S 237 6 speed Have owned it since '89. First as a straight truck with a grain body for the first ten years then converted to a tractor as the farm grew. Have had a KW and Freightliner but our Mack is definitely the favourite!
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Thanks I thought the rears would be more than just housings. I am finding it hard to find a 350 powered truck and am thinking about a swap as the local wrecker has a couple including a 12 speed to go with it. My old mack operators manual lists both a 2valve head and a 4valve head engine with different torque and hp specs. The 2 valve peak tq is at 1400rpm and power at 1950rpm.The 4 valve is torque at 1250 rpm and power at 1800 rpm . It doesn't say what the Torque actually is, but I am assuming the 4valve engine is the one to go for with my loads? With 11-24.5 rubber, 4.17 axle ratio, and the 12 speed OD at .78 it works out to 1650 rpm at 60 mph. would this be a good cruise rpm? the book says best fuel economy at a rpm less than that or should I care?
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Our 237 has a 4.17 ratio and in deep reduction it has no trouble starting the load. So I was thinking that since the 12 speed has a similar deep reduction ratio the 350 would probably do just fine. It would be nice to have the rpm a 100km (62.5 mph) a little lower but I guess that is the trade off. Also I was told that the only difference in mack 38 and 44 rears was the housing, and the internals are the same. any truth to that?
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I am looking for another R Model tractor for pulling our grain trailer and equipment trailer. Would a 350 & 12 speed handle 140,000 pounds or should I be looking for an E9? We don't have much for hills ( don't have to shift down ever with a 435 cat 18 speed) Our 237 six speed will almost handle the load but it is pretty hard on the truck. Any thoughts?
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Hi everyone we farm in north central Alberta and have a 1980 RD685s 237-6 spd bought in '89. Was first set up with a grain dump body, now pulls a tandem hopper trailer. Still looks good and runs great have a freightliner as our main truck now but want to replace it with another Mack! Just found this site while looking for some info.
Engine & Trans Swap
in Engine and Transmission
Posted
No not yet still planning the swap. Was hoping to avoid the wiring issue
I was thinking about an E9 but I don't need 500 Hp or repair bills since I need to pencil in a future rebuild. Our 430hp cat in the COE has no problem pulling the b-train anywhere we go even out of a soft field at harvest time.