Engine Size vs. Weight - .7 Factor.....
Engine Size vs. Weight - .7 Factor.....
(OP)
I would like to open a discussion forum for some of you gurus out there. Given there are numerous variables, I would like to hear opinions if you were given the following:
Engine size (in cc's) multiplied by .7 equals weight of car. For example: A 2000 cc engine x .7 = 1400lbs.
Constraints: 1500lbs minimum (1000 cc = 1500) 3500cc maximum
The question would be, if you were building a drag racing car, full out power, not to overanalyze the torques involved, gearing, etc., lets leave all that constant between the two, which would you choose and why?
Engine size (in cc's) multiplied by .7 equals weight of car. For example: A 2000 cc engine x .7 = 1400lbs.
Constraints: 1500lbs minimum (1000 cc = 1500) 3500cc maximum
The question would be, if you were building a drag racing car, full out power, not to overanalyze the torques involved, gearing, etc., lets leave all that constant between the two, which would you choose and why?





RE: Engine Size vs. Weight - .7 Factor.....
2) As small as possible. Your traction is limited by the size of tyre, and, generally, you cannot afford to increase the size of the contact patch in direct proportion to the vehicle weight.
3)Somewhere in between. One of the laws of spacecraft design is that the optimum is rarely to be found at the extremes of a solution space.
Cheers
Greg Locock
RE: Engine Size vs. Weight - .7 Factor.....
I see a large 6 cylinder motor cycle engine, or maybe a Honda S2000 engine in your future.
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Engine Size vs. Weight - .7 Factor.....
RE: Engine Size vs. Weight - .7 Factor.....
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Engine Size vs. Weight - .7 Factor.....
I think all these factors couldimpact the choice.
Off the top of my head I'd say buy an F1 engine (a few years old, of course :) since they are north of 900 HP these days
RE: Engine Size vs. Weight - .7 Factor.....
I believe that the tire coefficient of friction drops as weight increases, since increased weight can easily contribute to increased tire abrasion and tire deformation components of the tire's friction, but not to an increased tire adhesion component.
RE: Engine Size vs. Weight - .7 Factor.....
Also the class where my ample weight was part of the total vehicle weight, and not a pure disadvantage.
Also a full bodied car so there was a place I could hide the NOS bottle.
And I'd never win a race by more than 0.002 seconds, like the Russian weightlifter Vasili Alexeev who broke 79 world records