Reversed firing order
 

Can this be done on a boxer motor, or do 911 builders do this ? I was taking to a v8 builder and he said you can get the cams ground to reverse the firing order so it will fire from the middle to the outside cyls and it creates balance and some serious HP. Just trying to get enlightend.

Hmmm, Porsche has been working on this motor for almost 50 years. You'd think they would have thought of this!

I think that the conventional firing order for a flat 6 is as balanced as a street motor can be. It is balanced better than any other configuration so I do not think that a change in firing order would help much because there is no problem to eliminate.

It is common for MOTOGP engineers to play with firing order...you'll know doubt have heard of "big bang" engines.

Doesnt produce more power but rather changes the power & torque characteristics

http://www.motorcycledaily.com/08april05_bigbang.htm

Straight 6, Flat 6, or in line triple are perfect engines. All are 120 degree cranks. A great read is "The Design and Tuning of Competition Engines". It is EXTREMELY hard to improve on perfection!

Well.... Mostly, anyway....

Just as a point of interest, the Laverda Jota (a 1000cc triple, originally a UK-only importer-tuned special based on the Laverda 3C) used 180 degree cranks for most of the production run, although Laverda did switch to 120 degree cranks towards the end.

Sounded rather special - you could clearly hear the gap in the firing order when it was at cruising RPM, like a 4 with a cylinder missing...

Heh! Drunk Italian Engineering notwithstanding...

Here's the sound the Laverda makes, I don't have the associated pic of it vibrating like a freakin washing machine!!

http://www.thecreeper.net/laverda/jota1000.wav

Les

Cool cool ,just throwing it out there. Thanks for the a$$ kicking.