Yes, I did think a lot about that problem and here is my solution:
The Diesel runs at 1800 RPM, the gas at 2900, so I need a 0,62:1 extra ratio somewhere between engine and road.
(RPM at 80Km/h, 50MPH)
Thing,problem;
Tranny: Max 1:1 ,new tranny also 1:1
Transfer box: Low/4WD: 1:1,74 High/2WD: 1:1, cannot change ratio's
Diffs: 7,2:1, cannot find other ratio's
Wheels: 1100-20, cannot mount larger ones.
Solution:
Take a 2nd transfer box and mount it reversed onto the existing transfer box and make the rear driveshaft a bit shorter. The 2nd transfer box is placed in Low gear, but since the power is put on the "other" side of the box, the box acts as an excellerator with 1/1,74 = 0,57 ratio!
I figured it out and it will fit!
By only putting the 2nd transfer box in Low (= in fact extra High) when already in 4th gear on the highway, we have a super-overdrive.
The only two drawbacks I can find is: Is the current tranny strong enough for twice the torque? and: Dont put the current transfer box in Low (=4WD) and the 2nd box in "Super High", the rear wheels will turn 1,74 times faster than the front wheels and something will break! (the most expensive part-I guess)
The extra loss of energy in the 2nd tranny is not a big problem, I am not going to drive a million miles.
Richard (leading the above described project)
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