Triumphrat

david_in_ky · 01-24-2010, 10:05 AM

A couple of group questions/opinions..plea for advice..

1. My bike has just single path exhausts..is there an advantage or cost effectiveness in the joined exhaust system..the crossover? I have new valves, am rebuilding both carbs, new pistons, etc.. opinions or experience ? Hate to spend the $$ if no real value added

2. I currently have my timing case and shift case off .. the transmission seems to be in some odd gear pattern- locked.. turned freely before.. should I just put the cover on and fumble with the gear change lever to get back in sync ? use the kicker to bump and find neutral ? Of course the clutch is engaged.. primary cover is off and engine is on the stand... ideas or experience

?

Thanks for the help...

Tonybaloney · 01-24-2010, 11:10 AM

On the first question, one of the ways exhaust systems enhance performance is by the length of the pipe and changes in diameter at the junctions of pipe and muffler, muffler taper and total length to the outlet. When the pipes of two (or more) cylinders are combined (siamesed as it were) the sonic pulses of negative pressure that shoot back to the exhaust valve from each of the changes and junctions (including the ends) split at the siamesed juncture and head for both cylinder's exhaust valves. Crossover pipes, balance tubes and 2 into 1 exhausts perform better than individual pipes when properly designed to time the negative sonic impulses to extract the charge from the cylinder those impulses hit.

shrugger · 01-24-2010, 12:48 PM

Quote:

Originally Posted by Tonybaloney

On the first question, one of the ways exhaust systems enhance performance is by the length of the pipe and changes in diameter at the junctions of pipe and muffler, muffler taper and total length to the outlet. When the pipes of two (or more) cylinders are combined (siamesed as it were) the sonic pulses of negative pressure that shoot back to the exhaust valve from each of the changes and junctions (including the ends) split at the siamesed juncture and head for both cylinder's exhaust valves. Crossover pipes, balance tubes and 2 into 1 exhausts perform better than individual pipes when properly designed to time the negative sonic impulses to extract the charge from the cylinder those impulses hit.

Whew! thats a whole lot of techno babel.

Lets boil that down to
one sentence shall we.
"it Idle's better." LOL!

68TR6R · 01-24-2010, 01:50 PM

Quote:

Originally Posted by Tonybaloney

On the first question, one of the ways exhaust systems enhance performance is by the length of the pipe and changes in diameter at the junctions of pipe and muffler, muffler taper and total length to the outlet. When the pipes of two (or more) cylinders are combined (siamesed as it were) the sonic pulses of negative pressure that shoot back to the exhaust valve from each of the changes and junctions (including the ends) split at the siamesed juncture and head for both cylinder's exhaust valves. Crossover pipes, balance tubes and 2 into 1 exhausts perform better than individual pipes when properly designed to time the negative sonic impulses to extract the charge from the cylinder those impulses hit.

That pulse, as well as help draw burnt charge, they also keep unburnt mixture in the cylinder. With a proper exhaust you can achieve greater combustion volume.

Plewsy · 01-24-2010, 02:11 PM

Quote:

Originally Posted by shrugger

Whew! thats a whole lot of techno babel.

Lets boil that down to
one sentence shall we.
"it Idle's better." LOL!

Even better with the balance pipe between the carbs.
Blonk em off and eliminate air leaks and do 70.
david_in_ky
try rotating the motor back and forth whilst operating the gear lever.
Siamese pipes where originally for when you attached a sidecar.
Though where they join,
tuned lengths, assumed reflection points and all that

can improve breathing of the motor as said

david_in_ky · 01-24-2010, 02:28 PM

thank for the input guys ... am going to add new exhaust with xover to my wish list..

also will jigger the trans to reset...