Posted by Tiago Rocha on May 26, 2009, 1:39 pm
> "he had the uncanny ability to break anything
> including an anvil in a sand box with his bare hands."
hey! you aren't talking about me, are you????
-- T
Posted by Tiago Rocha on May 27, 2009, 8:30 am
> Compared to many CV carbs, the
> Dellorto PHM40, the Keihin (dunno the name) that was thrown in the XR600R,
> the FCR-MX series has many advantages,
compared to CV carbs, anything is better!
CV carb is nice, smooth, light pull and all, but any dirt that gets
past the air filter could get jammed between the slide and the carb
body and the vacuum will never have enough strength to pull the slide,
so you end up with something that doesn't work and the result is
getting stranded, tipically in middle of nowhere. Also, when you land
from jumps, the slide bottom out, again, the vacuum is never strong
enough to keep it lifted where you want it to be, the result is a bog
every landing... Meanwhile, you get passed by all others who run real
fuel delivery systems. They also tend to cause stalling if you release
a wfo condition suddenly, because it almost completely close the air
flow to the engine, suddenly cutting the vacuum, which makes the slide
to drop too fast so it doesn't transition to the idle fuel orificies
properly/fast enough to keep it idling... And don't get me started on
body/slide wear that makes the thing stick. CV carbs are a *very* bad
idea.
I'm not in a good mood today... :-/
-- T
Posted by spamTHISbrp on May 27, 2009, 8:50 am
> > Compared to many CV carbs, the
> > Dellorto PHM40, the Keihin (dunno the name) that was thrown in the XR600R,
> > the FCR-MX series has many advantages,
> compared to CV carbs, anything is better!
> CV carb is nice, smooth, light pull and all, but any dirt that gets
> past the air filter could get jammed between the slide and the carb
> body and the vacuum will never have enough strength to pull the slide,
> so you end up with something that doesn't work and the result is
> getting stranded, tipically in middle of nowhere. Also, when you land
> from jumps, the slide bottom out, again, the vacuum is never strong
> enough to keep it lifted where you want it to be, the result is a bog
> every landing... Meanwhile, you get passed by all others who run real
> fuel delivery systems. They also tend to cause stalling if you release
> a wfo condition suddenly, because it almost completely close the air
> flow to the engine, suddenly cutting the vacuum, which makes the slide
> to drop too fast so it doesn't transition to the idle fuel orificies
> properly/fast enough to keep it idling... And don't get me started on
> body/slide wear that makes the thing stick. CV carbs are a *very* bad
> idea.
> I'm not in a good mood today... :-/
> -- T
Maybe because its a 650, my CV carb has acted perfect for me after
drilling the holes in the slide out a little.
Not as much throttle response, but excellent manners. Race conditions
might show some more weaknesses of course.
Dave
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> including an anvil in a sand box with his bare hands."