A couple questions about supercharging a 440
As Coyote Jack stated blowers are a lot of fun ! I built a 1972 Dodge Colt with a 440 and 6/71 in late 1986 . I used the stock steel crank with the LY rods , just changed out the rod bolts to ARP . Used stock steel heads with a small amount of hand porting by me . Cam was the old 509 DC cam . For carbs used 2 750 DP set up by BDS . Back then they blocked the power valve and over jetted to make for the lack of the power valve .
Now they have manifold ref . power valves that take a signal from the manifold and will run much better . Blowers will not give the carb a signal to add more fuel , by getting the signal from the manifold the carb will open the power valve and supply the engine with more fuel . I will add pic's of a carb .
Just to let you know blowers are cranky , when starting up a cold motor , BDS recommends to pump the gas petal 3 times and count to 10 slowly and the crank the engine , when it starts try to keep it running but if it tries to stumble and cut off DO NOT pump the gas it will back fire and could damage something . I helped one of my friends build a 1971 Demon with a blown 440 , He called me and said that he could not get the engine to idle , looking at the carbs I saw that the rubber plugs on the bottom of the carbs were gone , I put my fingers on the 3 missing plugs and he started it up and it would idle , removing them it cut off . I asked he it it back fired and he said yes . So be care full when starting a blower motor up when cold .
Next be sure you put a large exhaust system on it , on my Colt With a lot of limited space I used see thru glass pack mufflers 2 1/2 inch . Power was good but take em off John Force Burn outs were unreal .
On the 1971 Demon we used a 8/71 blower and ran into the back of the blower hitting the wiper motor , I think that the car had a 2 speed wiper set up , If I remember straight a 3 speed wiper is a little different and when installed it still hit but with a little work with a file on the edge of the wiper gear box we got the needed space to fit the blower , just sealed up the gear box with a little gasket sealer and painted it .
Now for the good stuff , the Colt would run 0 to 100 in 7 seconds in second gear , would break the back tire loose in third gear at 35 mph when rolling , Would scare the crap out of your passenger . I used a 4:10 gear and a 3000 converter . Would idle at 750 rpm and had a hell of a lope .
I am now building a 66 cuda with a 472 crate hemi with a 6/71 and one 1050 cfm carb .
I posted pic's of the Demon , 1050 cfm QF carb with the fitting that goes to the manifold and a pic of the 472 Hemi in the car , Still looking for pic's of the Colt . Hope this will help you with your issues .
As Coyote Jack stated blowers are a lot of fun ! I built a 1972 Dodge Colt with a 440 and 6/71 in late 1986 . I used the stock steel crank with the LY rods , just changed out the rod bolts to ARP . Used stock steel heads with a small amount of hand porting by me . Cam was the old 509 DC cam . For carbs used 2 750 DP set up by BDS . Back then they blocked the power valve and over jetted to make for the lack of the power valve .
Now they have manifold ref . power valves that take a signal from the manifold and will run much better . Blowers will not give the carb a signal to add more fuel , by getting the signal from the manifold the carb will open the power valve and supply the engine with more fuel . I will add pic's of a carb .
Just to let you know blowers are cranky , when starting up a cold motor , BDS recommends to pump the gas petal 3 times and count to 10 slowly and the crank the engine , when it starts try to keep it running but if it tries to stumble and cut off DO NOT pump the gas it will back fire and could damage something . I helped one of my friends build a 1971 Demon with a blown 440 , He called me and said that he could not get the engine to idle , looking at the carbs I saw that the rubber plugs on the bottom of the carbs were gone , I put my fingers on the 3 missing plugs and he started it up and it would idle , removing them it cut off . I asked he it it back fired and he said yes . So be care full when starting a blower motor up when cold .
Next be sure you put a large exhaust system on it , on my Colt With a lot of limited space I used see thru glass pack mufflers 2 1/2 inch . Power was good but take em off John Force Burn outs were unreal .
On the 1971 Demon we used a 8/71 blower and ran into the back of the blower hitting the wiper motor , I think that the car had a 2 speed wiper set up , If I remember straight a 3 speed wiper is a little different and when installed it still hit but with a little work with a file on the edge of the wiper gear box we got the needed space to fit the blower , just sealed up the gear box with a little gasket sealer and painted it .
Now for the good stuff , the Colt would run 0 to 100 in 7 seconds in second gear , would break the back tire loose in third gear at 35 mph when rolling , Would scare the crap out of your passenger . I used a 4:10 gear and a 3000 converter . Would idle at 750 rpm and had a hell of a lope .
I am now building a 66 cuda with a 472 crate hemi with a 6/71 and one 1050 cfm carb .
I posted pic's of the Demon , 1050 cfm QF carb with the fitting that goes to the manifold and a pic of the 472 Hemi in the car , Still looking for pic's of the Colt . Hope this will help you with your issues .
