Aloupol
|
| posted on 11/12/04 at 10:17 AM |
|
|
If you have 200 ch so about 150 kw, your cooling and exhaust system blow away at least ...450 to 500 kW!!!
The thermodynamic efficiency of your engine is between 20% and 30% in average conditions.
|
|
|
|
|
CooperLight
|
| posted on 11/12/04 at 07:07 PM |
|
|
yeah, but the parker type can only handle 62KW each,maximum -> ( 4x62 Kw in 4WD system)
Dunno about the heat, I think that the lower efficiency numbers are due to hydraulic oil passing through the (unsealed) pistons, not due to
heat-transfer alone.
(Does that add up?, the energy has to go somewhere)
|
|
|
kb58
|
| posted on 12/12/04 at 04:20 AM |
|
|
Exactly, the energy has to go somewhere. 200hp in and 180hp out means 20hp is going out as heat.
BTW, regarding this whole 4WD thing... it's not going to work unless there's a third diff between the front and rear axle...
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
|
|
|
Rorty
|
| posted on 12/12/04 at 05:42 AM |
|
|
quote:
Originally posted by kb58
BTW, regarding this whole 4WD thing... it's not going to work unless there's a third diff between the front and rear axle...
Not strictly true Kurt, but it would certainly make it a lot easier on the whole system if there was a centre diff.
Some of the 4WD hillclimb cars don't have a diff in them anywhere! 
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
|
|
|
kb58
|
| posted on 12/12/04 at 05:08 PM |
|
|
True, by forcing it, the car can be made to turn, but it won't be polite to the poor tires. In a turn the front and rear axles are on different
radii, so one axle or the other will be forced to scrub off the difference.
Mid-engine Locost - http://www.midlana.com
And the book - http://www.lulu.com/shop/kurt-bilinski/midlana/paperback/product-21330662.html
Kimini - a tube-frame, carbon shell, Honda Prelude VTEC mid-engine Mini: http://www.kimini.com
And its book -
http://www.lulu.com/shop/kurt-bilinski/kimini-how-to-design-and-build-a-mid-engine-sports-car-from-scratch/paperback/product-4858803.html
|
|
|
Rorty
|
| posted on 12/12/04 at 08:17 PM |
|
|
It's funny how things go around: It used to be that motorsport lead the way and tyre scrub was frowned upon and efforts were made to reduce it
in persuit of steering and traction perfection.
That largely seems to be the realm of the luxury saloon these days, while currently, many codes of motorsport are compelled to endure scrub (in all
aspects) and leave it up to the tyre makers, personal tweaks and driver skill. Much more like sport IMHO.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
|
|
|
RallyHarry
|
| posted on 13/12/04 at 10:57 AM |
|
|
diff ?
If it's hydraulics, you can use electric-valves to move the force to each individuall wheel, and of course back to front ...
There's no end to how complicated it can be made ( probably too complicated :-)
Cheers
|
|
|
sgraber
|
| posted on 13/12/04 at 03:12 PM |
|
|
quote:
Originally posted by RallyHarry
diff ?
If it's hydraulics, you can use electric-valves to move the force to each individuall wheel, and of course back to front ...
There's no end to how complicated it can be made ( probably too complicated :-)
Cheers
The result of 2 different threads of thought running in the same space.
Any referrence to Diff would be talking about the original subject matter, twin BEC mated to 4 wheel drive mechanical system.
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
|
|
|
malcolmstoddart
|
| posted on 7/1/05 at 05:24 PM |
|
|
Mr Graber... thankyou for you kind comments about the acres of white visible ... (mental note to oneself, less white showing on drawing) in my
defence it was because I had just ripped them off a cad drawing and never reduced my canvas size...
In regards to the tensioning of the belts an eccentric cam on the "slack side" of the arrangement would suffice.
I have put a "bit" of thought into the turn one engine off and run on one to conserve fuel.. you would need separate gearchanges for this,
otherwise when you knock one into neutral and engine off, other one will follow suit.
|
|
|
