more torque vs. less/dry sump oil system vs. reg. oil system?

tvfreakazoid

I was curious to know why american sports car tend to have more torque compared to euro sports cars (Ferrari, lambo etc)? Is there any advantage or disadvantages? I would think having more torque would be an advantage.

Also, is there a difference when a sports car uses a dry sump oil system compared to a regular oil system?

Just curious to know.

__________________
Mudders milk

Zsteve

American cars weigh more?

__________________
2010 LS3 C6 Silver coupe corvette

Modshack

Euro/Asian cars tend to make their horsepower at higher revs at the sacrifice of torque. The smaller the displacement and the greater the number of cylinders generally result in less torque. American cars have always been Big cubic inch motors in relation to their horsepower. Big displacement equals big torque. The Torque and horsepower curves always cross at 5300 or so RPM's on a dyno(I forget the exact number off hand). Torque is what you feel when you drive and tip into the throttle. More is nice.

Dry sump oil systems may have some reduced losses due to the fact that there isn't oil being thrown about the crankcase to slow things down. Porsches, Z06's are both dry sump systems.

__________________

Steal my car! (SOLD)...Now Porsche Cayman S
Oil Cooler DIY: Here!

kannibul

Actually, I don't think you're entirely correct...

It comes down to bore vs stroke. An engine that has a longer stroke than another, even given equal displacement, will have more low end torque. The flip side is that it won't have as much top-side RPM as there is much more reciprocating mass (and distance) therefore the maximum speed the engine can spin goes down...

A good example is to look at motorcycle engines...

Your typical V-Twin has a long stroke to small bore ratio. Result - lots of low end torque, decent HP numbers, and not very high RPM limit - on the other side you have a sport bike engine, these typically have smaller stroke and larger bores. Result - high reving engine with insane levels of HP for the displacement, and not really a whole lot of torque.

The ratio of bore vs stroke, can be referred to square, undersquare or oversquare, though I really don't remember which designation is which condition.

kannibul

Dry Sump - main reason is two fold.

1) Build in oil cooling - the sump is away from the block and it helps cool it.

But, in terms of cars...

2) No chance of oil starvation. Take a corner too hard/fast with the Z and some R-Compound tires, you'll force all that oil away from the pickup tube, starving the engine of oil.
Even in my old pickup truck, if I slammed the brakes too hard or cornered...the oil pressure light would come on. Only does that for one reason...no oil getting picked up!

kdoske

kits some times come out to convert a vehicle to a dry sump system. Usually cost 1500-2000 $'s.

Armstrong Race Engine Systems - Cast Aluminum And Magnesium Components For Professional Racing

Island_370

they cross at 5252

Horsepower = (torque x rpm)/5252

__________________
Autobahn Country Club (North and South Tracks), Blackhawk Farms, Grattan, Gingerman, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill, VIR and "The Ring"

tvfreakazoid

So, dry sump is better i'm assuming. And it cost a lot of money to convert them into dry sump system.

Any Z owners plan on doing this conversion? I guess there's no reason to unless you take it to the track often.

__________________
Mudders milk