[steves]

Calm down children and fight nicely.

[mstngsrule68]

no not you dexter, scotty.......and for that responce, i was busy and didnt have time to go into detail. but if you wish you can jump over to my buddys thread and look at his build and it will explain everything.

[scottynoface]

Lulz, this thread delivers them.

Seriously, chill out, not like I insulted you or anything, just asked how you were going to deal with the issue and you had no response, I could look at rob's thread but you're MUCH more fun.

I'm gonna ask again since you didn't have an answer last time, how are you planning to tune the carbs? I'm genuinely asking you this, quit taking it as an insult.

[mstngsrule68]

im not talking to you.

[teddy]

nevermind, not even sure why I bothered...carry on...

[ITS_NOT_A_KNIFE]

Ok let matt post his pics and info, if you guys want to know how everything is gonna work you should be directing them toward me since im more the brains and builder on his bike and also my own, he got the idea to do this after he seen my build in my garage.

All in all, CV carbs do not care about boost, as long as fuel pressure is 1psi over boost pressure they work like there normal cv carbs....this is untrue for any other carbs, like flatslides, or round slides. And this isnt my first turbo blow-thru or draw through setup for that matter

Back to the build

[hardlydangerous]

Ok let matt post his pics and info, if you guys want to know how everything is gonna work you should be directing them toward me since im more the brains and builder on his bike and also my own, he got the idea to do this after he seen my build in my garage.

All in all, CV carbs do not care about boost, as long as fuel pressure is 1psi over boost pressure they work like there normal cv carbs....this is untrue for any other carbs, like flatslides, or round slides. And this isnt my first turbo blow-thru or draw through setup for that matter

Back to the build

Ive built many turbo systems and that said i willl point out fuel pressure is not nearly as important as the carbs air pressure. In order for a CV carb or any carbs on a blow throu system to perform NORNALLY ( yes there are otherways to do it but none give you the driveability without huge flat spots in the power curve or dead spots in the carbs fuel metering) you have to balance the bowls to the intake pressure

higher fuel pressure is needed to force fuel into a presurized fuel bowl...
you must plumb the carbs vent system to the sealed intake before the carbs. This will = the pressure from the throat of the carb and the float bowl so there is no differences in the fuel metering. as you said fuel pressure must still be slightly higher then then boost pressure. if there is 5 psi of pressure in the bowls there must be 6+ psi of fuel pressure.

if you dont = the pressure in the bowls the air jets for the pilot circuit and secondarys behind the venturi will be overly lean as they will see a higher air pressure then the venturi, the bike will have to draw most of the fuel from the main circuit and thats where the dead spots come from that so many first timers complain about. ie the bike runs clean with the intake pipe pulled off the plenum or crank case vent removed etc, by dropping the pressure the carb will perform normally. but hooked up acts like its not getting any air

FWIW the Busa and Bandit engines are a lot stronger then the Kat, much heavier rods, crank etc and we have seen blown gaskets and major fuel issues at even 6psi. I would not run the engine at 6psi on anything less then 100 octane on an air cooled.
I would also highly recommend a catch can built for the crank case vent and dont forget to use a PCV valve. you dont want to be blowing gaskets and seals out of the engine.

[mstngsrule68]

now thank you for your advice.

[loudnlow7484]

Calm down children and fight nicely.

Just thought I'd point out the irony here....

im not talking to you.

[mstngsrule68]

so last night, got about half of the plenum done, the hole saw bit ran dull so that was it for the night, tonight the plenum will get done, just need to paint it afterwards and such........ umm pretty much it for now.. ill post back later tonight with what gets done.

[ckenwright]

Just looked for the smiley eating popcorn. Couldn't find it.

[scottynoface]

Just thought I'd point out the irony here....

[mstngsrule68]

the plenum got done tonight, ill post pics tomorrow.

[JasonChen]

Just looked for the smiley eating popcorn. Couldn't find it.

[mstngsrule68]

popcorn sounds delish right now....