Diesel/Veggie oil motorcycle - Page 2 - Fuel Economy, Hypermiling, EcoModding News and Forum

Frank Lee · 06-09-2011, 12:10 AM

Looks to me like no trans at all.

dcb · 06-09-2011, 07:57 AM

Some of the conversions have transmissions, and obviously that would be preferable if it fits your budget and bike. But the torque curves on these is very flat once you are rolling, so you can "get away" without one, by making the same compromises as the no-transmission electric vehicles do.

I would love to see some transmission options, I know the old BSA and any divorced transmissions route, retro-direct doesn't work on a diesel, some folks have converted 2 and 4 stroke bike transmissions (would love to see a build thread on that) by sawing off the cylinders,etc, others have made custom gearboxes...

Christ · 06-09-2011, 10:39 AM

I'm still working on the 4 stroke gearbox thing.... Figuring out which trans to use, since I have so many.

(Engines, projects, bills, etc...)

Hal · 06-10-2011, 10:33 PM

V-twin diesels are fairly common: 25 HP V-Twin Diesel Engine Electric Start for instance.... The transmission was mentioned "CVT comet 94 "duster"" . CVT = continuously variable transmission

Christ · 06-10-2011, 10:48 PM

Wow...I can sell that same engine for less than 70% of that price, if I get enough serious interest.

Fat Charlie · 06-11-2011, 07:54 AM

That reminds me of the Changzuki.

dcb · 06-11-2011, 07:58 AM

Quote:

Originally Posted by Hal

CVT = continuously variable transmission

Problem is you throw a lot of efficiency away with a CVT when half the reason for converting to diesel is for maximum efficiency.

Christ · 06-11-2011, 12:15 PM

Quote:

Originally Posted by dcb

Problem is you throw a lot of efficiency away with a CVT when half the reason for converting to diesel is for maximum efficiency.

I think this efficiency loss with CVT is a bit blown out of proportion, though.

Is it really that inefficient ALL the time, or only while it's actually doing something?

When it is only cruising, shouldn't it be about as efficient as a basic belt drive of the same ratio? How often do you really plan on accelerating?

dcb · 06-11-2011, 01:11 PM

For some reason I have %75 efficient in my head for that sort of CVT, but unfortunately I lost the trail.

Christ · 06-11-2011, 01:42 PM

That one has a model that comet doesn't make any more, but it seems to me that 75% wouldn't allow that klr diesel to get up to 60mph+ with a 10hp motor... Let alone 120+mpg.