PeachParts Mercedes-Benz Forum - View Single Post - Is the 5-speed used in campers/vans like a W123 4-speed with an extra-low first?

Mölyapina · #74 02-15-2013, 01:47 PM

Quote:

Originally Posted by Stretch

I've got more or less the same numbers as you now.

I've done a list with mph numbers for comparison. I'm using a 24.7 inch tyre that is a 195/70R14 specification tyre though here they are for both the standard W123 values and the possibly fictitious ratios on the TN gearbox

Please note I don't think that any of these estimated road speeds are actually achievable at the high ends in real life where you'd be battling against adequate power produced by the engine (especially an OM617) and aerodynamic drag and hills etc etc

I've yet to find the information I have somewhere that would give an indication if the OM617 would be powerful enough to rev past say 3000 rpm with a 2.24 differential ratio in normal circumstances. I don't think you've got much hope. (Assuming I've finally got my numbers right!)

I don't need to go past 65-70 MPH in my driving, but I would really like to reduce noise and boost fuel mileage -- that's why I'm interested in this. I would most likely dismantle the whole thing and re-install the automatic if I ever put it up for sale (unless, against all odds, it actually turns out!). Mine is a turbo, so at least I have that going for me.

...so I guess the one other way I could go is to buy a 5-speed w/ 6.14:1, and then try to find a 4.1:1 gear set to swap in (if that's even possible...).