Porting a 70 barrel

forget the walboro.. they can give good results and responce but no butterfly carb will ever be equal to what a pwk can do

you want full throttle power with an auto and you just dont get this witha walboro.. easy to setup and great on fuel/responce/mid throttle use but as i said all out power will be down

 

ye, and a 21 is way too small to get any real power out of a barrel.. if your porting a case you will need a 25 minimum to see results.

i remember somone saying about a league with crank/carb limitations tho so if this is the reason id go with what you know. but slide carbs will always have less turbulance and all out power than a butterfly. (as you are more than aware of im sure)

other thing you have to remember is you will only really need power with these at full throttle as the rest of the range the transmission makes up for. perfectly setup it WILL hit max revs at full throttle regardless the load the engine is under. direct drive like carts/boat engines and jetski's can have the output from an engine restricted by force = lower rpm. this doesrent happen with a scoot as it will full throttle and not loose any revs even up a 1 in 3 incline. variators rule

 

28pwk/dell for you then... LOOOOOOOL you wont regret it

 

nothign wrong with peaky engines if they make more power. all im saying is you dont need any mid power, just aim for max power at max revs youyr crank is rated at an tune the pipe to suite.

the only gain to be had from a walboro other than setup is the length of the inlet tract. with a shorter tract responce and mid power is gained wiht a loss of all out speed. if you use a longer inlet tract (most seriouse uk tuners are) you gain more top sp[eed and higher rev power and the transmission makes up for losses low down. its swings an roundabouts but i can only say what ive found so far.

good luck wiht it anyway, whatever you do its gonna be fast this much we all know, its wether its fast enuff to go to spielmansplatten and try your luck with the euro's that matters to me (wanna get there the next couple years for sure)

 

lots of the euro's have tryd walboro's/cart carbs and allsorts of other nonsence but all fall back on slide carbs and inch long inlets as a minimum. longer basicly slows the attack wave from the engine meaning a more steady stream = less responcive but less flutter on the reeds and at full wack there not as sensative to the constant start stop of the pressure wave as theres sort of a discharge area for the air in the tract itself..

i think of it like a baloon.. the bigger the area of the balloon the less a set pressure will affect it. so if you squeeze a small baloon it will double in size, a large baloon will only swell slightly.

ether makes sence or sounds like complete arse but sounds good to me ether way