How do you get blower surge with carburetors. I've tried what people told me, richen up the fuel mixture and set the idle screw lower and it doesn't sound very good.
It is a rich lean rich lean rich lean condition. I have EFI and at first I had blower surge and then hooked up a wide band and got the idle to 12.7:1 and it idles 1000 RPMs rock solid without the surge.
T.J.
Thats part of it right there. Shut down the idle to one carb and force it to idle off one carb. The idle circuit in one carb will play hell trying to keep up. Empty-fill, empty-fill..... Get rid of that wimpy ass cam and get some thing with about 290 @ .050 on about 106 LSA, and install it at about 112 IC. Put the lightest springs you can in the dizzy along with the heaviest weights. Guarantee it surges. Won't run worth a damn, but who cares, it will sound bitchin and all the non blown guys will think your cool.LegHumpl):ameRealitysphss
Hell, half the reason to have a blown set up is for the cool factor of a big surge..... How hard are you spinning the blower? Has a lot to do with cam profile as well.
when you have surge every body looks at you with the bitchen factor,when you dont nobody cares,you dont here of any race boat with out surge,its a bitchen factor and you just have to have it
hil KidssphssOnly people not running blowers think it bithcin. People who do run blowers just think "dumb shit doesn't have a clue how to setup a carb for a blower"
I don't know the percentage of overdrive, but I have a 53 tooth on top and 50 on the bottom. For the cam, its a comp cams, gross valve lift is 737 intake, exhaust .741, duration @ .050 intake 270, exhaust 276, and lobe separation of 114.
Thanks
when you have surge every body looks at you with the bitchen factor,when you dont nobody cares,you dont here of any race boat with out surge,its a bitchen factor and you just have to have it
i dont shut down 1 carb they both are working in sinck with each other nasty and rumblin theres not a drag boat around that dont have surge and if it doesnt it isnt fast
I am one of the dumb sh--s that don't have a clue (the way I feel sometimes). I worked with it, changed air bleeds several time, both ways.
I was told told three circuit carbs would not work with a blower. That didn't make sense to me, so I kept working to get rid of the surge I didn't like.
I can tune another one now a lot quicker for no surge.
Mine is a 540 BBC, Dart Pro 1 heads, 9.3 compression with 14-71 blower on gas and carbs.
It is in a Cole tr-4
No surge, leaves hard and no hesitation.
It is the only way to go. Remember, if it don't go -- Chrome it.
The motors in my boat have a pretty big surge to them. From about 600-1200 RPM's. One thing a lot of guys here are forgetting is, some drive lines do not like to be shifted above a certain rpm. I run Bravo's, and they do not like to be shifted above 7-800 rpm. Trying to get a blower motor, with a decent cam, to idle below that is pretty damn hard. With the surge, I simply wait for each motor to drop down in the rpm's, and I click it right into gear. If it wasn't for the surge, I wouldn't be able to get it into gear at all.
You know what I think most of the guys that say they don't like the surge
really do like it. but it sounds cool if they say they don't . because there
(RACERS)
With those 660's on my old motor and springs in my dizzy it would make my motor have a slow surge. It even did this when i was a kid and it had a 396 in it. Both these setups were NA (not blown). As soon as i locked out the timming though that surge went away. I could hear it trying when blipin the gas but locking out the timming definitly put a end to it. I used to like the surge on my deal when i was a kid, not so much these days. But i love the blown alky surge! Come on, who doesnt!
my boat does it and the weights are locked out on the dist. carbs are set up good, 1150 annular 3 circuit (c&j engineering blueprinted them) at least they the egt's on the dyno were constant (1480), the back of the boat does not need to be cleaned when I take the boat out. I am running 30% overdrive on the blowers, large soild roller cams and stalling while shifting is a problem, the #6 drives and trans have not had a problem. but I don't think badly tuned engines are the cause of blower surging.
my boat does it and the weights are locked out on the dist. carbs are set up good, 1150 annular 3 circuit (c&j engineering blueprinted them) at least they the egt's on the dyno were constant (1480), the back of the boat does not need to be cleaned when I take the boat out. I am running 30% overdrive on the blowers, large soild roller cams and stalling while shifting is a problem, the #6 drives and trans have not had a problem. but I don't think badly tuned engines are the cause of blower surging.
Not necessarily a badly tuned engined, just not optimal As stated on an outdrive it is necessary to get the boat in gear though.
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