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Old 08-03-2016, 07:06 AM   #461
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Originally Posted by Tango View Post
Most diesel engines are happiest (mpg & lifespan) at or near their peak torque number. NOT the max HP RPM.
I agree, thats one reason I started driving my bus a 60 instead of 65.. its quite happy there.. RPM's are a bit lower, easier to drive etc.

if I need to go 65 I'll put a different transmission in.. but really ive determined that most of my life.. I had listened to my father and every roadtrip was a race against anb imaginary clock in which I drove constantly and the fastest i could to "get where i was going".. I really never enjoyed the scenery along the way..

so having a bus that I drive slower is actually a good thing.. I'll have to look up the torque / HP curve on my engine.. ive not done that to see where it would be the absolute happiest.

-Christopher
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Old 08-03-2016, 10:25 AM   #462
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Not sure about your engine but I do know that my Cummins 4BT's peak torque (327fp) is at 1700 RPM and its' "sweet spot" is about 1800. Peak HP is at 2300 (mine being 130HP).

MPG's fall of rapidly as you go above 1800 as does its' life expectancy. The "B" series engines are designed to go 500,000 miles if treated reasonably. I plan doing my best to keep it happy. You can run any diesel up against its' RPM limiter but you will pay the price.
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Old 08-03-2016, 11:36 AM   #463
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Originally Posted by EastCoastCB View Post
I'm really starting to get more used to the heat now that I've done a week of construction in the sun. The first day or two were the worst for sure.
I'm starting to rethink my whole bus project.
Seems to me we won't really ever be FULL timing it, as we have jobs in the area and own a home. I'm going to think about it for a day two but I'm starting to really want to USE this bus a lot. I may actually forego the roof raise and spray foam and do a much quicker, simpler conversion for weekends and weeks at a time use. Plus we have like 8 or 9 cats and a dog. I don't like keeping them cramped up in cages, either. I could be 75-90% done with the thing this year if I refocus my efforts and get a good plan together. If I don't raise the roof, I'm definitely going to do a collapsible deck up top.
I'm not at all intimidated by the raise, I just don't know if I REALLY need it for what I'm using the bus for. Sometimes its good to rethink things. IDk. Sorta "thinking out loud" a bit here. What yall think?
Hmmm, i can see foregoing the roof raise because that seems like the most time consuming thing to me. I'm not so sure i would skip the insulation tho. A roof top lounge in on my wish list too haha.
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Old 08-03-2016, 11:58 AM   #464
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Quote:
Originally Posted by Tango View Post
Not sure about your engine but I do know that my Cummins 4BT's peak torque (327fp) is at 1700 RPM and its' "sweet spot" is about 1800. Peak HP is at 2300 (mine being 130HP).

MPG's fall of rapidly as you go above 1800 as does its' life expectancy. The "B" series engines are designed to go 500,000 miles if treated reasonably. I plan doing my best to keep it happy. You can run any diesel up against its' RPM limiter but you will pay the price.
mine is rated for max life if set at 2700 Loaded RPM max and 2900 freewheel max RPM.. I think the DT466's.. the layter ones are 2500 / 2700 and the early ones were 2300 ...

yeah like you say you can run them faster but pay the price..

-Christopher
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Old 08-03-2016, 12:19 PM   #465
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Hmmm, i can see foregoing the roof raise because that seems like the most time consuming thing to me. I'm not so sure i would skip the insulation tho. A roof top lounge in on my wish list too haha.
Oh, I'd still be insulating. Just not spray foaming.
If I don't raise, I'll be using the purple closed cell board stuff that's like an inch thick. Would be a vast improvement over the fiberglass garbage.
I may still do the raise, I'm just giving it some thought. Will either be raised or on to other aspects by the end of the summer.
If I had any help with the raise, I'd be a lot more inclined.
I'm having trouble finding a halfway level spot, can't get any of my fabricator buddies to even come out and have a look, and its gotten harder to get tools and materials lately for me.
If any of you experienced guys or gals in the southeast wanna come help me get this DONE, I'd gladly pay you a handsome fee. Seriously.
Maybe we could have a roof raise party/skoolie meetup??
I guess I'm just getting itchy to get some good progress going and need some guidance/reassurance. IDK. THinking out loud some more.
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Old 08-03-2016, 12:36 PM   #466
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Old 08-03-2016, 01:25 PM   #467
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Quote:
Originally Posted by EastCoastCB View Post
Oh, I'd still be insulating. Just not spray foaming.
If I don't raise, I'll be using the purple closed cell board stuff that's like an inch thick. Would be a vast improvement over the fiberglass garbage.
I may still do the raise, I'm just giving it some thought. Will either be raised or on to other aspects by the end of the summer.
If I had any help with the raise, I'd be a lot more inclined.
I'm having trouble finding a halfway level spot, can't get any of my fabricator buddies to even come out and have a look, and its gotten harder to get tools and materials lately for me.
If any of you experienced guys or gals in the southeast wanna come help me get this DONE, I'd gladly pay you a handsome fee. Seriously.
Maybe we could have a roof raise party/skoolie meetup??
I guess I'm just getting itchy to get some good progress going and need some guidance/reassurance. IDK. THinking out loud some more.
Finally, someone who is of similar mind (except for the fee part)--I would love to raise roof, but is only me and no friends/acquaintenances who might/could/would (probably not) help without costing far more than I can afford (monetary or otherwise)--wish I had more skoolies nearby to visit for motivation!

Thanks EastCoatCB for making me feel a little less alone with wanting vs. getting done!
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Old 08-09-2016, 06:45 AM   #468
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Not sure about your engine but I do know that my Cummins 4BT's peak torque (327fp) is at 1700 RPM and its' "sweet spot" is about 1800. Peak HP is at 2300 (mine being 130HP).

MPG's fall of rapidly as you go above 1800 as does its' life expectancy. The "B" series engines are designed to go 500,000 miles if treated reasonably. I plan doing my best to keep it happy. You can run any diesel up against its' RPM limiter but you will pay the price.
Exactly!! Fuel economy is maximized by understanding torque (and it's relationship to gearing) and getting just "over the hump" in the torque curve of you engine. You can find this two ways (other than from a chart). One is to "feel" the engine while running. After driving a while, you can sense when it's laboring and when it's not. Two, is looking at the exhaust. If black smoke is billowing from the exhaust "economy" (and your cash) is needlessly being pumped out the tailpipe (unless on the way to a hospital, running from a zombie hoard, etc...). If you watch the exhaust and "keep it clean" you'll most likely not have a combustion temp problem (indicated on a pyrometer). Max rpm has everything to do with not hurting the engine and nothing to do with fuel economy.
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Old 08-09-2016, 06:46 AM   #469
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Yep. Why my next bus with have high hp and 3.73 rear.
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Old 08-09-2016, 07:11 AM   #470
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I think AWE ONE's sweet spot is 60mph @ 2200rpm
I need to add a pyro
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