Join Date: May 2009
Location: Indiana/ Michigan line at the Lake
Semi-pointless tech Q about MC engines
For over 100 years, motorcycle engines have literally always had the
carbs behind the engine and the pipes sticking out of the front.
(This much we already know.)
Since high school, one of my buddies n' I had wondered about the whole ram-air thing on the musclecars of the 60's-70's and why, why, why don't bikes
have the carbs out front with cool fresh air getting crammed in them at speed? The natural vaccuum behind a forward traveling MC would greatly help exhaust gas scavenging too.
I'm still wondering 25 years later why don't the rockets especially have a huge scoop feeding the carbs or injection tunnels right behind the front wheel?
Obviously the pipes are curved back both for scavenging and to keep hot pulses from cooking us on hot days.
The only real answer we could ever come up with is to keep the entire engine at a relatively constant temperature throughout the block. The front/ intake would be MUCH cooler than the rearward facing exhaust valves and headers.
So why not get a turbo effect for free when at freeway speeds?
Enquiring mind(s) wanna know. Plus, it would look kinda cool on streetbikes with a big, gaping chrome shark mouth/ funnel behind the forks.
Thanks in advance to any techies with real world knowledge who wanna take a stab at this, or novices on engineering like me who wish to take an educated guess in the dark at why.