TwiBlueG35

The new M5's 5.0L V10 producing 500hp seems more impressive to me.

Fanman

Definitely seems like 2 different engines. One more geared to smooth effortless power in a luxury line with 7 speed automatic, the other max hp in a street race car with a 6 speed manual.

Palmateer

MB engine will pull strongly all the way to redline, while pushrod V8s tend to get wheezy at higher RPMs.

j-man8

http://www.autoweek.com/news.cms?newsId=102769

autoweek's got an article on the Merc motor too. They say it weighs 438 lbs for those wondering. Now we need to find out how much the LS7 weighs

lyndon_h

I can't find any specs about the LS7 weight, but I did find something interesting.

"Most importantly, the dyno graphs show that output torque never drops below 350 lb-ft from just off idle all the way to redline, providing flexibility that is nearly unequaled among production engines"


Not so sure where i got the info, but i did a google search and game up on a corvette internet mag, so take it with a grain of salt.

rai

Well, I say it's pointless as to which is the best engine it's splitting hairs and you can't swap them even if you wanted to. An Enzo or Carrera GT has a better engine than either, but engine alone costs more than an entire car.

We'll all say the 2.0L honda is better than the toyo engine in an Elise but as a whole package the Elise (seems to me) is better in spite of it's lesser engine.

Also say a 240hp engine in a Boxster is better than the 240hp in the S2000 but how much better and how much more expensive? For another $10K beyond the S2000 you're getting some extra TQ but the same HP. I know you're getting more than just the engine with the S2000 v Boxster so it's hard to say how much the engine costs.

My point is, the Z06 costs $65k and the MB will probably cost at least $85k

MaxGeek

LS7 gets pretty good gas mileage for a 505hp V8. How does the new mercedes engine do?

rai

gas mileage on the "EPA circuit" is not real world mileage. whatever engine produces 500+ hp will have to burn a lot of gas. You may say a vette can get high 20s to low 30s on constant highway, but that's not due to the engine. You could put a civic engine in a vette and cruise at 70 mph. The Vette engine at 70mph turning 1300 RPMs is probably only producing 150hp (or so) and thus not burning much gas.

Here's a little example from how-stuff-works -->>click

In other words no matter what engine if you're going to use the max power 500+ hp you're going to be burning a lot of gas.

The EPA cycle never does full power acceleration and never goes over 70mph so whatever a car gets on EPA cycle does not mean what it'll get in the real world.

rockville

I think that's a stripped weight. I'm guessing the LS7 weighs just under 500lb (dressed with flywheel). The LS1 was something like 485lb. The LS2 was supposed to be a few pounds less. The LS7 was supposed to be a few pounds more than the LS2 hence I would guess the LS7 is about the same weight as the LS1.
However, there are actually two GM quoted weights for the LS1 according to HotRod Mag (link below). The auto was 460lb the Manual was just over 500lb (fully dressed). The difference in weights is because the automatic version of the engine does not have a flywheel (the torque converter housing acts as a flywheel).
I also recall the new BMW M5 motor was something like 535lb dressed. I believe it would include the flywheel weight. I suspect that MB is probably not lighter than the BMW or GM motors when you add (or subtract) the flywheel and other dressing.

http://www.hotrod.com/techarticles/50638/index2.html