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+--- Thread: BREAKING: new 4 in 4 exhaust (/showthread.php?tid=8323)
RE: BREAKING: new 4 in 4 exhaust - the Ferret - 09-18-2020
https://en.wikipedia.org/wiki/Tuned_exhaust
RE: BREAKING: new 4 in 4 exhaust - Lord Popgun - 09-18-2020
Do I get to say Helmholtz resonator again? Cause I like to say Helmholtz resonator!
RE: BREAKING: new 4 in 4 exhaust - peterbaron - 09-18-2020
Not Helmholtz but Helmut holds
RE: BREAKING: new 4 in 4 exhaust - Roper_imp - 09-18-2020
(09-18-2020, 05:07 AM)The ferret_imp Wrote: https://en.wikipedia.org/wiki/Tuned_exhaustThanks ferret. I also read the link to exhaust scavenging. This part "The purpose of a 4-2-1 exhaust system is to increase scavenging by merging the exhaust paths of specific pairs of cylinders," makes me think that the "2" part of the equation is merging cylinders differently from what I was envisioning. Also, the information about primary tube lengths and diameters is fascinating--making me realize that there's a heck of a lot of engineering involved in designing an exhaust system, and that drilling holes, removing stuff, swapping parts, etc. could have a huge negative effect on engine performance if you don't know exactly what you're doing.
RE: BREAKING: new 4 in 4 exhaust - the Ferret - 09-18-2020
Yea that's why I trust the engineers and dont make many changes to modern Japanese motorcycle that aren't strictly for aesthetics.
RE: BREAKING: new 4 in 4 exhaust - mrichi_imp - 09-20-2020
If the 4into1 system is more efficient , how come dragsters just have straight out pipes ?
RE: BREAKING: new 4 in 4 exhaust - Roper_imp - 09-21-2020
Because dragsters are all about raw power, not efficiency.
With belt-driven blowers and Nitromethane, the only purpose for exhaust pipes is to get the still-burning gas out and away as quickly and safely as possible.
RE: BREAKING: new 4 in 4 exhaust - Paris_imp - 09-22-2020
(09-20-2020, 11:28 AM)mrichi_imp Wrote: If the 4into1 system is more efficient , how come dragsters just have straight out pipes ?
I took the exhaust system off my '81 CB750F just to see what would happen. It was so loud, it sounded like a helicopter.
RE: BREAKING: new 4 in 4 exhaust - whizzle_dizzler_imp - 09-23-2020
(09-22-2020, 03:03 AM)Paris_imp Wrote:(09-20-2020, 11:28 AM)mrichi_imp Wrote: If the 4into1 system is more efficient , how come dragsters just have straight out pipes ?
I took the exhaust system off my '81 CB750F just to see what would happen. It was so loud, it sounded like a helicopter.
BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP BLOP
RE: BREAKING: new 4 in 4 exhaust - Houtman_imp - 09-24-2020
It does not sound as if the bike runs well , it missed two BLOBS !