I've got a rich bog WOT off idle. Holley can't figure it out..
447 FE, 11:1 Comp, Comp 308R solid roller, MSD Pro Billet with 6AL. Motor only has about 500 miles on it.
1000 HP with annular boosters, upside down black front and red rear in 2, 52 shooters right now. 50cc pumps. 3.5 PV's. transfer slot's good. stock jetting.
idles at 700 RPM. 6" vacuum, 18 deg at idle 36 deg at 2500. 3600rpm stall converter, 4:11 gears.
Issue: when you go WOT from a stand still it will rev up to about 2k then stand still, some times it will clean up some times not. also will do this during a brake stand, will not spin tires on pavement. It pukes black smoke when it does this. If its on dusty pavement it wont bog and just blow the tires off. Ive tried all the cams and shooters, any less than a 37 and it will backfire through the carb. Going up in shooter with a front heavy cam provided the best results but far from great, right now with an upside down black and a 52 shooter has the least bog. Timing changes didn't do anything positive. tried higher idle, didn't change anything. Tried idle mix screws, no positive changes.
If you are moving more than 5-10 mph and hammer the throttle it will blow the tires off.
I think the boosters are coming in before the pump shot it done causing this, but im not sure how to fix it. this is my plan and my ideas:
1- I will be replacing both 50cc pumps with 30cc to see if it changes anything, also changing the secondary to the same as the front.
2- custom grind a carb cam to the profile i need
3- change the air bleeds to move the fuel curve.
Any ideas would be greatly appreciated.
447 FE, 11:1 Comp, Comp 308R solid roller, MSD Pro Billet with 6AL. Motor only has about 500 miles on it.
1000 HP with annular boosters, upside down black front and red rear in 2, 52 shooters right now. 50cc pumps. 3.5 PV's. transfer slot's good. stock jetting.
idles at 700 RPM. 6" vacuum, 18 deg at idle 36 deg at 2500. 3600rpm stall converter, 4:11 gears.
Issue: when you go WOT from a stand still it will rev up to about 2k then stand still, some times it will clean up some times not. also will do this during a brake stand, will not spin tires on pavement. It pukes black smoke when it does this. If its on dusty pavement it wont bog and just blow the tires off. Ive tried all the cams and shooters, any less than a 37 and it will backfire through the carb. Going up in shooter with a front heavy cam provided the best results but far from great, right now with an upside down black and a 52 shooter has the least bog. Timing changes didn't do anything positive. tried higher idle, didn't change anything. Tried idle mix screws, no positive changes.
If you are moving more than 5-10 mph and hammer the throttle it will blow the tires off.
I think the boosters are coming in before the pump shot it done causing this, but im not sure how to fix it. this is my plan and my ideas:
1- I will be replacing both 50cc pumps with 30cc to see if it changes anything, also changing the secondary to the same as the front.
2- custom grind a carb cam to the profile i need
3- change the air bleeds to move the fuel curve.
Any ideas would be greatly appreciated.