lectron problems again

Guess I'm missing something here because not understanding why a different shape metering rod (jet needle) would not afford a richer fuel mixture ratio in higher throttle range, while keeping the same lower range mixture.

[Click on image to enlarge view]

Sory for dumb questions, but i have never seen these cabs in hand.
Does this needle go up and down with the slide as a normal carb or is it fixed in the body somewhere? is there a pic/diagram avail of the brake down?
I just noticed the slide pic.
it seems that they operat the same as a normal carb but u change the needle for the mid rather than raise it. and change the needle rather than the main jet for top end. what i dont understand is why do they say to change the pilot jet as well, for top end?

mark the needles go up and down with the slides there are no jets in the carbs at all it works off the emulsion tube the jet that they are talking about is the power jet that is mounted on the body of the carb injects in to the throat at high rpm but only on some carbs mine does not have that jet

So they are like conventional air jets that alow fine tuning of the mains?
what is the main advantage of these? i know the racres like then for the drags, but have never heard of them on road race bikes? . Is it just for ease of tunning the dragers like?

looking at the bottom of the slides shape u might think that they would provide a stronger signal down low in the rpm .but i have heard that there weekness is there low end performance?? what are your thoughts?

any chance it oculd be an ignition related issue?

well i found out what my problem was. it was dyno operator error the first 15 pulls iwas chasing my tail over nothing ichaged needle heights, tryed different fuel line combos, swaped the type of fuel,changed my ignition system, redegreeed my cams and all along it was dyno error he had hooked up two trigger wires for the ignition pickup so the engine was only reading half the actual rpm what was causing the carbs to areate was that i was hitting the rev limit not running out of fuel like i thought so i made 3 more hits and found out that i'm running rich a bit and i'm only making 147 horse and 96 ftlbs of torque so i either have to go to bigger cams or i have to either build up another head or hog out the one that is on there now i just put about half a seasons passes on the dyno so i'm not real happy. i couldn't hear the motor or i would have clued in allot sooner. with what i have in that engine i was hoping for at least 175 horse but iguess i'll try my big cams and see what that does for it but not right now i don't think i'll be going on that dyno again anytime soon may be i'll save the cam change for the spring at our first test and tune after i try this motor out the way it is, can you say gong show

Don't you just love it when it's something so simple you just blow right past it.

DynoJet Dyno? or what?

What cams are you running?

Is the head stock?

You know this already but I'm going to remind you....Don't let the Dyno rule your drag racing world. I've seen more than one dragbike wip out some pretty impressive Dyno runs and run like a turd down the strip. Backing off on the cams produced quicker and more consistent ET.......something to keep in mind anyway.

You might just consider running it as is and see what you get for results. Then make the cam swap after you collect some real data.

JMO

Larry C

Dear Mr Timebomb,

I am not trying to be rude, however I will be direct. I have a totally different point of view on your dyno testing.
You put your bike on a wheel driven dyno (inertia dyno) These dynos are good for testing acceleration of a known mass. These dynos are for average joes to fine tune their engines. They are cheap and easy, not built for testing raw power. These dynos can miss there mark by 10% - 18%. So I will use an average of 14% (147hp + 14% = 167.58hp) (96ftlbs. + 14% = 109.44 ftlbs.)Then if you add in your elevation (6000'+)& weather, you will find that you have done much better then you currently think you have. Come down to sea level and put it on a engine dyno (absorption dyno) and see the big differance.
I would say that you should put on your happy face and enjoy what you have. Let us know the results when the rubber meets the road..................kzz1p

Well that must have been frustrating. I'm glad it was something simple though.
You really had me scratching my head when u said u had 159lbs of torque. that just didn’t make sense.
do u have any flow #'s on the head, and cam specs to share ?

I'm curious to how fast you want to run?...
I have a similar motor in a pro street bike...1385 fbg head 40 lectrons...never had the thing on a dyno...but it will run mid 9's all day long without the n20 and also without changeing the gearing...all with no slick or wheelie bar...
in a wheelie bar bike with proper gearing ...Im quessing 9.0's maybe a high 8 on a good day.

yes that is what i'm looking to get excactly for numbers what kind of gearing are you using

i don't have any flow numbers on the head as i wasn't even close to a flowbench when i ported the head iwish now that i had got it checked i am using web cams .460 intake .435 exhaust .262 at .050" intake with 108 lobe centers and 261 on the exhaust with109.5 lobe centers at.050"i'm using stock sized valves after sitting back and looking at things for a couple of days those are numbers i can probably work with and we have a couple of test and tune days before the season starts in may so i think i'll get another head ready to go and run this one the way it is for now and see what happens i also have my set of 500" cams sitting till i got my other chassis so if worst comes to worse i can always throw them in as the head and valve train have already been set-up for them the only reason i didn't use them to begin with is i don't like broken valve springs and i have heard those big cams can eat them up. this the first big block that i've built so all in all i'm happy i didn't wing it on the dyno and it will run quick but i guess i just let my ego get in the way thinking i could reinvent the wheel and make more power than anybody else alive i'll just have to be content in the knowledge that it hasn't blown up yet so i must have done something right.