350 Bullet tuned exhaust length?

Reply

350 Bullet tuned exhaust length?#4539

By 803ERT - Tue Dec 30, 2014 8:39 pm

- Tue Dec 30, 2014 8:39 pm #4539

I'm sure somebody out there knows the answer.............for a fairly standard english 350 bullet...........what would be the correct 'tuned' length for a straight through exhaust pipe with no silencer fitted?

350 Bullet tuned exhaust length?#43002

By papasmurf - Tue Dec 30, 2014 8:57 pm

- Tue Dec 30, 2014 8:57 pm #43002

It is the best exhaust pipe volume you need to know for what engine characteristics you desire, and that is close to rocket science.

350 Bullet tuned exhaust length?#43003

By PeteF - Tue Dec 30, 2014 9:01 pm

- Tue Dec 30, 2014 9:01 pm #43003

350 in standard trim? Well, I don't know the answer but I suspect it will make no difference at all.

Classic C5 Euro 4 at the moment.
Also CBf250.

350 Bullet tuned exhaust length?#43004

By papasmurf - Tue Dec 30, 2014 9:03 pm

- Tue Dec 30, 2014 9:03 pm #43004

This may help:-

http://www.bgideas.demon.co.uk/tmanual/Tm_Ch4.pdf

350 Bullet tuned exhaust length?#43014

By 803ERT - Wed Dec 31, 2014 11:57 am

- Wed Dec 31, 2014 11:57 am #43014

Thanks papasmurf, I've had a look at your link and as you say a little bit too close to rocket science. (Werner von Braun I salute you). However, it did have a critical sentence in it: ''If a silencer is used, expansion will take place at this point, so the start of the chamber should occur at a 'tuned' tailpipe length.......''.
I.E. (as I read it) Take the silencer off and the down-pipe outlet is already at the tuned length...........and I think Tony Wilson-Jones knew what he was doing!?
Regards, John.

350 Bullet tuned exhaust length?#43025

By Leon Novello - Thu Jan 01, 2015 12:30 am

- Thu Jan 01, 2015 12:30 am #43025

It`s usually the two-stroke engines which need careful exhaust pipe tuning, as they depend on back pressure for timed exhaust extraction and inlet feed. Take the muffler off a two-stroke and it will barely run, if at all. Isn`t it illegal to remove the muffler from vehicles? You could also put the neighbours off-side and damage your hearing. Besides, I don`t think it will make any noticable difference to performance. A lot of fiddling about for nothing.