8 replies to this topic

[TAB666]

I was browsing forix.com for some cool pics. I found a pic with the best looking engine and pipes ever.
http://www.forix.com...68/03001_RN.JPG

I just wonder why they made the exhaust pipes so long. I know that the lenght of the pipes are important, but the pipes on this car looks like over kill.
Can it be a way to get all the babes ?

Tobias

[desmo]

This appears to be Beltoise's MS11 at it's debut race in '68. I don't remember the Matra having such long pipes before. The book on pipe length is that longer lengths favor low-end over top-end. Looks like a stop-gap measure to cover for a lack of low end grunt perhaps to me. I'll bet it sounded great, even if it couldn't beat the DFV version[p][Edited by desmo on 01-09-2001]

[Richard Border]

Those pipes would really have looked cool on one of the Munster families' cars. When I think about it it kind of looks like the coffin car!

On the tech side though the pipe's overall length isn't that much longer than the normal pair of 4 in to 1 pipes. I say that because the pipes overhang the rear about as much as say a Lotus/Ford V8's pipes did. I think it's just that you see soooo much pipe, and they are striaght that makes them look so long.

[Larry Connell]

Originally posted by desmo
This appears to be Beltoise's MS11 at it's debut race in '68. I don't remember the Matra having such long pipes before. The book on pipe length is that longer lengths favor low-end over top-end. Looks like a stop-gap measure to cover for a lack of low end grunt perhaps to me. I'll bet it sounded great, even if it couldn't beat the DFV version[p][Edited by desmo on 01-09-2001]

Agree, exhaust pipes are tuned to a frequency. The higher the frequency (RPM) the shorter the pipe will need to be. It is a trade off, if you need some extra low end grunt longer exhaust pipes will help, but you trade off some top end. The same is true for the intake stacks (trumpets), but most current F-1 engines use intake stacks that are automatically adjusted to engine RPM. Mercedes/Ilmor first used these in F-1, I THINK. The FIA has decreed variable length exhausts to be a no-no. So you still have to make trade off decisions there.

[Ray Bell]

Just taking off again where they left off, after a fashion...
This is the case if Ilmor-Mercedes were indeed first with the variable inlet length. This was said to be (in Design and Bahaviour of the Racing Car') the next step in development of the M196.

[Ursus]

I now know why the exhaustpipes cannot extend beyond the rearwheel centreline. Imagine sliding sideways into the rear of that car!

[swoopp]

Mercedes were not the first to use variable length inlet trumpets in F-1. I know Honda had them when the supplied McLaren back when Senna drove for them.

And how about those pipes, if they squirt some fuel into them, they could be used to prevent someone from passing... nice...

[Alvega]

Slightly O.T...

There must be some thrust associated with the exaust gases exiting at the rear of the car at high speed.

Anyone has any idea on this, and the related equivelence in HPs ?

[Powersteer]

They named Ferraris exaust pipe 'periscope exaust' because of the way it points sky wards slightly. We must call this one 'Churches Organ' pipes.