Corsa-A.de

Kam mir letztens so beim Grübeln...

Wenn man anstatt des 4-2-1 Krümmers 2 2-1 Krümmer machen würde und hinten dann zwei Puffrohre rausmacht.
Wär mal was Ausgefallenes. Is sicher aus Platzgründen nicht ganz einfach, aber sicherlich machbar. Nur... bringt das was?

Has anybody any idea what the heck i´m talking about ?!

I'm assuming you are talking about linking cylinders 1&3, 2&4.

then taking 2 pipes out to the back of the car?

you will lose torque everywhere and consequently lose horsepower.

sorry.

But with a smaller Diameter, the pressure should increase...
Wonder what it would sound like...

and what happens to the scavenging effect that exhaust pulses from different cylinders use to suck mixture into the next cylinder (or in most cases simply to evacuate exhaust gases from that cylinder)?

not much. they will not be very effective at doing that at all, as they would require unusually long primary pipes to have any effect. in which case you might as well simply bolt 4 long pipes to the head - that would have pretty much the same effect...

the other problem ist that you can not decrease the diameter of the primary pipe as it must still carry the exhaust gases away effectively - decreasing its size will give you better emissions, but it will also drastically reduce the VE of your engine as the cylinder will still be full of already burnt mixture.

sound wise. it would sound a bit like an off beat 2-stroke engine. not very nice at all.

regards

mat

Ok, it just came to my mind.
Again a lesson learned.
Thanks for the replies and explenations.
I´m sure, one day I will come up with an idea, which will relvolute the whole engine building.
I just need so more time

yeah - lots of time - there are a lot of very smart people out there that think about this kind of stuff every day...

just for your info - some engine builders have tried a slightly different configuration of linking the primary pipes: instead of linking 1&3, 2&4 the linked 1&2 3&4. the theory was, that at high RPM the amount of exhaust produced would be sufficient to create a pulse to pull gases from the next cylinder (wich would require a very long pulse).

what they found was that they needed incredibly short primaries to actually get a scavenging effect, ruining the torque spread. it did actually allow the engine to rev a little more freely at very high rpm, with a 1BHP gain at ~10000 rpm when compared to a conventional exhaust design.

needless to say - the idea was binned very quickly because it made the car uncompetetive. a 1bhp gain did not justify the lack of power everywhere else... bearing in mind that these are top spec engines - imagine what an exhaust like that would to to a "mildly tuned" engine.

The best things have not been invented by purpose
Ok, except the car

jetzt quatschen die schon auf französisch

Je ne dis pas ! ils sont Fou!

ce claro

Los Senores parlen Espanol?

I prefer English

Da gings wohl ein bischen mit uns durch