ok i am about ready to rip off my dellorto throw it in the trash and sell a testicle to run f.i! it keeps bogging.. actualy it is more of a sputter, it only does it in 1 and 2 but it is after 4500 rpms!????? what the hell is it! it didn't do it on my other car but i never had the carb in the winter so i hope it is the cold. if you know what is wronge slap me and tell me i am an idiot and fill me in!

my dellorto worked great in -30 here.Just have to let the motor warm up before having fun.Thats a tuff one to say what it could be tho.

it runs just great but when i romp on it is sputters! and whont ide when it is cold out side?

Mine I would have to hold the gas at 1500 for a minute or two and let the motor warm up a bit before I let off the gas.Mine didn't idle well when it was cold and it was boggish in th lower rpm range.Thats what you get with a huge 2 barrel.

it does it when the car is warm, not when it is cold, it does it when the "air" is cold i think it is a fuel presure thing to be shure so tomarow i am redoing the hole fule line thing and droping the gas tank and cleaning it...

How long have you had it? It might be time for a rebuilt. I had experince with a Dellorto in cold weather and never had a problem as long as the car was fully warmed up.

are any of u guys running ok in the cold run a tad rich in warmer climate? maybe his carb needs to be adjusted for the change n air density.

well after dumping out 1/2 galon of frozen water out of the gas tank, it still spudderd, so i played with the carb.. after about 6 tries i got it to only do it over 5500 rpms, and is hardy felt.. the carb prolly does need a rebuild but i don't know where to get the gaskets.. if you do help me out. running 4-6 psi in the fuel presure so i think it is good on fuel presure, i do think the cold has some part in it though, maybe i need to just go through everything, overhaul the carb, new pluggs, and clean all the points in the dizzy, and go from there, but yes input is verry apritiated....

oh if it helps it only does it under full throutle....

Are you talking it sputters as soon as you hit the gas at 5500rpm or does it accelerate then when you hit 5500 rpm it sputters?

My REPU sputters or hesitates for an instant as soon as I hit the gas but then it recovers and accelerates smoothely. If you figure out what it is let us know.

yours sounds like an accelerasor pump issue tom, its either too much or too little. it might be hard to get it 100% out just because you have the ability to open the carb 100% at anytime

while accelerating, at full throutle, when it hits 5500 rpms it spuders....

The Dellorto is a great carb. Like a beatiful Italian woman, both exotic looking and nothing but trouble. But like the woman to sexy to walk away from. O.K. O.K> I stop with the metaphors, but serious if it doesn't need a full rebuild it could benfit from a good cleaning out/one's over. You can do this easily yourself by removing the top jet cover piece. Remove each jet and spray it through with carb cleaner then hit all the internal passage ways you can get to from on top. While your at it clean out both sets of filters inside. One is inside the round part of the fuel inlet (right were you connect your fuel line). The other-which is much smaller and usually cloged is inside the flought filler nosal. Handeling the flought with care remove the small spring loaded filler from the middle and inside you'll find the micro filter I'm talking about. After that you can put it all back together and start trying to tune the bitch (I mean carb).

PK797 NYC

too lean/fuel pump too small. the colder out side it is the "leaner" it will run. cold air is more dense

True but the lean condition can be because of a cloughed, or under-sized jet and or dirty backed up filters.

PK797 NYC

yep sure can

i think my jets are big enuf it is jettet for sea level..."6000 feet here" i cleaned the carb already took the hole thing off and cleaned every part and jet.. i think it has to do with the fuel presure, the pump runs 4-6 psi, what should i be running? i am getting a regulater next week maybe it will help

and i realy think the cold has a part in this, 6 deg. is verry thin air pluss the already to much gas???

i'm with j9, colder == denser, you need fuel to go with the increased air density. accelerator pump and jets are probably both in need of changes. mmm, carburetion.

well it kinda stopped doing it, when i replaced the fuel pump but it just looses poser now,? i think i need a regulater

Yeah spiney

From what I remember the fuel pressure for a Dellorto running on a 13B was 4.5 psi exact, but volume is also important. Holley used to make one that fit right into this range(4-6psi) and also had the correct volume- No regulator needed. I had it on my street ported GSL-SE and worked fine. Oh and your right about the cold the Dellorto's, even a good well tuned Dellorto doesn't like the cold for some reason. After everything is said and done and ones you get it tuned right you still may need to fabricate something to recirculate some warm air to it from your exhaust. Good luck and remember to write back and let us know what happens.

PK797 NYC

maybe the carb is iceing

I'm colder here than all you guys and mine gave no hassels once the motor warmed up.I just had to fab up some linkages.My dellorto was from the states so it was surpising it started up in -33*C