Frederic Breitwieser/turbo discussion

[Gary Derian]

No sarcasm taken, Fred.  In theory, you are entirely correct.  As a
practical matter, though, all V-6's fire bank to bank.  Its just the easiest
way to make one.  Maybe the only possible way.

With a 6 the goal is 120 deg between firing.  With a 60 deg V angle, the
crank needs 60 deg pin offset.  It is not practical to build a 60 deg V-6
with shared journals, the resultant engine would have 60-180 firing.  Way
odd fire.  With a 90 deg V angle, the crank needs a 30 deg pin split.  It is
possible to build a non split crankpin odd fire 90 deg V-6, (Buick and
Maserati) but even fire has much smoother torque.  The Dino Ferrari engine
had a 65 deg V.  I don't know what the crank looked like but I suspect it
had a 55 deg split.  Flat 6 engines use a 180 deg split that cancels the 180
deg bank angle and acts like an in line 6.  Still firing bank to bank.

Gary Derian <gderian at oh.verio.com>


>
>This message might sound sarcastic, its just my writing
>style... I'm going though this step by step so you can
>follow me thoughts, and in reality, so I can follow my
>thoughts too <G>.
>
>Lets draw a V6 engine here, looking at the top of the engine
>(intake), with the fan belts to the left, and the bell
>housing to the right:
>
> 2   4   6
>
> 1   3   5
>
>Good drawing, eh? <grin>.  Anyway, lets connect a headers to
>the odd banks to a turbo, and another header to the even
>banks to a turbo.
>
> /---/---/---(T)
> 2   4   6
>
> 1   3   5
> \---\---\---(T)
>
>If the firing order is 1-2-3-4-5-6 then each turbo receives
>and alternating pulse.  If the firing order is 1-3-5-2-4-6
>they don't.  That was all I was saying.
>
>The buick V6 firing order is 1-6-5-4-3-2, therefore there
>would be no need for 180 degree headers, i.e. crossing over
>exhaust tubes based on these pictures.
>
>Now I'm really curious.
>
>--
>Frederic Breitwieser
>Bridgeport, CT 06606
>
>http://www.xephic.dynip.com
>1993 Superchaged Lincoln Continental
>1989 500cid Turbocharged HWMMV
>1975 Dodge D200 Club Cab (soon to be twin turbo 440)
>2000 Buick GTP (twin turbo V6)