OHV Teaser

A fully trimmed 7.0 litre LS7 OHV V8 (Corvette Z06) weights 458 pounds, a fully trimmed 5.0 litre S85 DOHC V10 (BMW M5 and M6. 10 awards from "International Engine of the Year") weighs 529 pounds. They produce about the same amount of peak power, but the former have a far more favorable tourque band, less weight, smaller dimensions, is more efficent and less costly. So which one is really the most technically advanced?

yeah and a 7.0 litre BMW v10 would blow it away

LS7 also has to be hand built and has a dry sump system much more work and expense than the bmw lump.

also the 6.0 v10 fitted to the new 7 series has 80lb-ft of torque more than the ls7 and is still 1000cc smaller

But don't forget that it was V12 and got 2 turboes.

And stop .... Corvette got OHV .... not DOHC .... not even Turbo .... So LS7 wasn't really high tech.

I still love to take one rather than boring BMW.

yeah and a 7.0 litre BMW v10 would blow it away

And it would be the same size and weight as a small house.

LS7 also has to be hand built and has a dry sump system much more work and expense than the bmw lump.

You can buy an LS7 from the dealer for about $14k US. I can't even find pricing for a complete S85 crate engine on the entire internet, which most likely means if you went to the BMW dealer the parts counter guy would laugh in your face. I work parts for a Mercedes Benz dealer and MSRP for some AMG engines is over $50k US.

also the 6.0 v10 fitted to the new 7 series has 80lb-ft of torque more than the ls7 and is still 1000cc smaller

Considering it's twin turbocharged that's not impressive in the slightest.

The 7 series BMW currently doesnt ship with a V10 twin turbo. It ships with a 6.0 V12 twin turbo taht produces something like 400kw

If your arguing over which is more high tech id honestly say the BMW S85 by a clear margin. How americans get so little power out of such a big engine is commendable really :p

[Daffyflyer]

THIS is the only good reason for OHV

Engine that produce less power per litre than Daewoo Matiz?

Power per liter is only really relevant if you are limited in displacement in some way, and where the LS7 is really good is in power per kg.

The torque means you need a larger, heavier clutch and larger, heavier gearbox and shafts than the BMW though. It's also much worse on fuel at low throttle openings, so you need a bigger tank too. If you're using the V10 in something different the amount of weight you can loose in the flywheel and clutch alone is astonishing.

Looked at the LS7 when building the other rally car and ended up going with the BMW engine in the end for that reason - you end up with the LS7 actually being a slightly heavier package overall, especially as the BMW engine is much stiffer torsionally (can use it as a stressed member in the frame), and the powerbands are pretty much the same (yeah, I was surprised at that too!).

There's not much in it between them really when you look at full drivetrain package.
The LS7 lets you get the engine under lower bonnet heights though, which can be an aerodynamic advantage, and is probably more suited to cruising around at low rpms for those that have forgotten about the gearstick.

http://www.h1v8.com/page/page/1562068.htm

2.8L (3.0L option) 32-valve V8
91Kg (200lbs) - less than a normal I-4
298kW (400HP) @ 10,000RPM
332 Nm (245 ft-lbs) @ 7500 rpm

although does cost ~$40K

http://www.h1v8.com/page/page/1562068.htm

If you think that's trick, you'll love this: