I liked my 300D's driving habits enorgh that I wanted to combine it with my other passion...
I decided to use one of my 300's for the donor vehicle.
As anyone familar with piston steam knows they only turnover at 1000rpm when redlined.
But develop 1000-2000 foot pounds of torque at stall speed.
The torque numbers are for 10hp and 20hp ,respectively
Any rate,if someone knows how much torque the transmission can handle....that gives me
an overdrive ratio to divide the torque down to.
Stanley,Doble,and White in antique car museums ran direct drive at 1.25 street and .75 to1:1 racecar.
The torque numbers are the reason , 7-15 hp Stanleys were compepteing with 40hp Mercedes gas and 60hp Napiers in hillclimbs
and flattracks at the turn of the century.
A 30 hp Stanley hit 150 mph at Osmond speed trials (later moved to Dayton) in 1906.
With luck, the transmision can handle enorgh torque ...
that I can use double 10hp Stanleys on a mercedes differentail reverse coupled to the transmission for 1:1 overall ratio.
If not ...then the same arrangement less transmission to get the 1:1 overall ratio.
Interesting project. Without the engineering specifications I'd answer
this question empirically by looking at the transmissions' respective
My '80 300SD's engine produces 120 HP @ 4,350 and 170 ft lbs torque @
It has the 722.120 (W 4 B 025) transmission. The "025" of its number
indicates its maximum torque input, probably in kpm, which for this
engine is 24. This box is a reinforced version of the standard 4 speed
specifically for the turbodiesel engine.
There are some sites that list the various M-B models' engines and
transmissions. If the 300SD box isn't hefty enough for your application
you might look at a three speed from a 450 V-8 or even the transmission
attached to the 6.9 V-8. After that you'll need to look at the
automatics used in trucks.
It occurs to me that automatic transmissions may need a minimum rpm
input to build the internal hydraulic pressure to clamp their clutches
and bands etc. so your steam power's output rpm will need to be "stepped
up" quite considerably.
You confirmed my thought train.
Having to build the engines from museum prints....upgraded with modern
from what you have seen at the antique car rallies fail.High torque runs
like the steam
car rally climbing Mt.Washington ,really tells on cranks and related areas
needing modern metals.
Usually stress cracks that show up three months after the climb ,more so
than at the event..
And mechanical engineer for the light company has help me with
a copy of the steam side of a nuclear reactor plant..
Lots of people can see that the heat transmitter ....nuclear as high
But never think about how high tech. the heat reciever has to be. To handle
a "fire" so
hot that an oil burner or gas turbine looks barely warm,in comparrasion.
A boiler design like that is more compact , under the hood ,than turn of the
My pilot plant for the car project was a steam garden tractor ....a 3hp
steamer had it running
like a 30 hp gas tractor.Once you got past the monster torque issues....had
to use a 60's era
trractor in order to have something strong enorgh to re-enforce.New stuff at
the garden centers
can't handle the engine in it much less souped up stuff.
Switching from solid fuel(grass,leaves,and wood in yard is enorgh do the job
twice ...so the garden
still gets a bit of compost.) to diesel/waste oil burner soon.Needing to
work out a blue
flame(ultra low NOx) burner design for the car ,give or take
scaling.Shooting for 8gph on car for
SL performance and fuel economy though 12gph would get you AMG numbers in a
(Flame cycles like the flame on a water heater with pressure instead of
temperature.) In town at 35MPH
usualy averages about 3gph continuous on a 4500 lbs.antique car like Stanley
or White(Autocar for modern
tradmark,that is in the Chrycler/Daimler company collection. )
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.