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Re: Audi needs more power
> For some reason -- my own opinion -- Audi's non-turbo'd engine is
> helplessly inefficient in terms of power output. Even the new 5 valve V6
> Audi has on non-American A6 is a mockery of itself (being a high-tech 5
> valve engine, its overall performance is still mediocre).
The 30V has an extra valve per cylinder to help with the emissions, not
to increase power output over the 24V equivalent.
> So I wondered, "How does Audi's engine's performance (torque plays most
> of the role, but the number is harder to come by) in terms of bhp per
> liter?" So I did a quick look-up (as of current 95/96):
> bhp/litre maker
> 57.7 Audi V6 2.6
> 61.6 MB V8 5.0
> 62.1 Audi V6 2.8
> 62.2 Audi V8 3.7
All right -- these are all two-valve designs, and the Audi looks OK.
> 68.0 MB V6 2.0
> 68.1 MB V8 4.2
> 68.2 MB V6 2.2
> 68.8 MB V6 3.2
> 68.9 Audi V6 2.8 5-valve
> 68.9 BMW V6 2.8
> 70.4 MB V6 2.8
> 71.2 Audi V8 4.2
> 71.5 BMW V8 4.0
> 72.6 BMW V8 3.0
> 73.9 BMW V6 2.3
> 76.8 BMW V6 2.5
All four- or five-valves here, and the Audis are right in the middle of
the pack. So what's wrong with this?
> 86.8 Cosworth V6 2.5 (1993)
Whereas a specialized tuner engine isn't really comparable to anything
> But Audi's 5-valve just made
> in in par with "other two's" V6 2.8 -- totally dissapointing knowing Audi
> used 5-valve to let its V6 2.8 engine to breathe.
See above -- the extra valve isn't there to increase the power output. And
as for comparing it to the other V6s -- take a look at the torque curves.
The Audo 30V design has an incredibly flat and broad toque curve that is
unmatched in its class.
> Of course, bhp is not the whole picture for an engine -- torque plays most
> of the picture. But by briefly looking at bhp/litre efficiency, why are
> Audi's more popular engines at the bottom? Oh well.
Because they only have two valves per cylinder?
[ /tom haapanen -- firstname.lastname@example.org -- software metrics inc -- waterloo, ont ]
[ "everything that can be invented has been invented." ]
[ -- charles h. duell, u.s. patent commissioner, 1899 ]