hp/liter vs weight of engines

Which do you feel is more important?

i'd say overall weight is important. weight of any particular part has a direct impact to the measurable characterists of the car. i really cant think of any reason that hp/L is important.

besides, a bigger displacement engine making the same amount of hp as a smaller displacement fundamentally makes more torque, and can do so at lower RPM's. this makes for a better daily driver car, and gives the car in question more acceleration from a stop.

on the flipside, it isnt wise to just ignore how much hp you could get out of a specific sized engine, to do so would be to ignore your engines potential.

From my experiance the engines with the highest hp/l have also been lightest, e.g Honda, Cosworth, Lotus, Ferrari, BMW etc.
Of course those are Naturaly asperiated engines.
Turbo'd engines it tends to be a little bit differnt as you need much stronger and therefore heavier engines parts, however the extra weight is usualy more than off set by the extra power. E.g Turbo Cosworths, Nissans, Toyotas.

Which do you feel is more important?
That's an extremely complex question that would take many, many words to answer. So to give me time to wrap Christmas presents, I'll just distill my answer out to what it would have ended at anyway:
It depends.
It depends on what your car is.
It depends on what you are going to do with it.

From my experiance the engines with the highest hp/l have also been lightest, e.g Honda, Cosworth, Lotus, Ferrari, BMW etc.
Of course those are Naturaly asperiated engines.
Turbo'd engines it tends to be a little bit differnt as you need much stronger and therefore heavier engines parts, however the extra weight is usualy more than off set by the extra power. E.g Turbo Cosworths, Nissans, Toyotas.
An LS7 has more HP per pound than a VQ35DE :iceslolan
Ls7= 485 pounds VQ35DE= 460 lbs
ls7= 71HP per liter/ 505HP, VQ35DE= 82hp per liter/ 287/300hp.
tHE VQ35DE ins't obviously the highest HP per liter, but it's a damn good engine imo- good power from a 3.5 and also has torque (260/274 foot pounds)
I think certain japanese companies get caught up trying to put out really high hp per liter cars and they send with torqueless wonders like the S2000.

You kinda have to look at the whole package. Not just the weight of the engine.

I used a 670-lb engine in my 73 station wagon, but a 370-lb engine in an 84 trans am. They both make about 400 hp, but the trade off with the heavier engine was that I could get much more displacement, therefore a lower torque peak and still maintain that 400 hp. The fact that the wagon is so much larger, the extra weight is not my concern, the torque is.

An LS7 has more HP per pound than a VQ35DE :iceslolan
Ls7= 485 pounds VQ35DE= 460 lbs
ls7= 71HP per liter/ 505HP, VQ35DE= 82hp per liter/ 287/300hp.
tHE VQ35DE ins't obviously the highest HP per liter, but it's a damn good engine imo- good power from a 3.5 and also has torque (260/274 foot pounds)
I think certain japanese companies get caught up trying to put out really high hp per liter cars and they send with torqueless wonders like the S2000.

The following is from the January 2006 issue of Sports Car International on page 35 regarding the new LS7:

"The net result is a fully trimmed engine that weighs 458 pounds, only 10 more than the 6.0-liter LS2."

Also, BMW's M5 Product Information Guide says that the 5.0 liter 500 hp (SAE net) V-10 weighs 240 kg/529 lbs.

toyota JTCC use on the chaeser, an 3S engine,4 clyl 2litres and not the original 1J 6cil 2500cc. maybe is lighter and get better center
some skylines do the same RB to SR

The following is from the January 2006 issue of Sports Car International on page 35 regarding the new LS7:

"The net result is a fully trimmed engine that weighs 458 pounds, only 10 more than the 6.0-liter LS2."

Also, BMW's M5 Product Information Guide says that the 5.0 liter 500 hp (SAE net) V-10 weighs 240 kg/529 lbs.
I just fat fingered 458 to become 485 :smooch: