rajnish

guys let me mention a basic difference in 4st and 2st silencers.for one 2st are noiser and the funda is different.in 2 st u don't need to free flow the exhaust.but u can play with the exhaust shock waves and their backpressure to the engine again helps the performence.in 4 st there can't be a backpressure generation as it has valves unlike 2st.which have ports.so in 4 st u can increase performence by freeflowing the exhaust gases or scavaging.thus polishing the exhaust side of the head to a smooth finish helps in performence.so quicker u get rid of exhaust gases the better.
so can say only 2 st engine uses a expansions and 4st use a free flow exhaust..also putting another silencer on a 4st will alter the exhaust dynamics of a bike and will eat engine life.it's not gonna free flow exhaust in any way.if u use 2 silencers u have to re design both of them according to exhaust flow rate and compression of the engine.2 stock pipes=a screwed engine

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\'87 High Torque RD 350B
in first gear,6000 rpm,whack the throttle.

krome

rajnish can u also tell me wat is a sprts exhaust??

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rajnish

sports exhausts r nothing but free flow exhausts only.they come in diff. specs. as per the bike's requirements.

__________________
\'87 High Torque RD 350B
in first gear,6000 rpm,whack the throttle.

krome

i mean sports exhaust for cars. my zen has a free flow exhaust. but there are also sports exhaust which make a kewl racing sound...wat are they??

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rajnish

the sports exhausts for cars come with exhaust tips which help in producing bass or try a different can shape.

__________________
\'87 High Torque RD 350B
in first gear,6000 rpm,whack the throttle.

krome

ok... now expalin me the entire process.... pls rajnish. i want to make one...tell me from the starting to the end.

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MOKSH

YES EVEN I WANNA KNOW RAJNISH

rajnish

well not much idea of 4 st pipes.think it uses the dia of exhaust outlet compression and stroke leangth of the engine to design a pipe for it.indian companies just copy designs of foreign ones in case of cars.but any pipe should be tailor made for a bike.any ways a bigger jet and head polishing gives good results.followed by a bigger pilot jet and filter.

__________________
\'87 High Torque RD 350B
in first gear,6000 rpm,whack the throttle.

rajnish

Four stroke performance tuning by Graham Bell is the book for tuning 4 st engines.plz go for it for full indeapth bout the four cycle engine.

__________________
\'87 High Torque RD 350B
in first gear,6000 rpm,whack the throttle.

MOKSH

DUDE YOU SURE KNOW A LOT ABOUT ALL THIS
KEEP UP THE GOOD WORK