So on my day off I'm of course tinkering with the bikes. Both have modded Predators, one Hemi, one non.
Flywheels/rods/cams/emulsion tubes/jets/ported and polished/22 pound springs/governor and low oil deletes, high flow air filters.
Okay as to the latter As most know you have an adapter that bolts to the front of the carb so the air filter coupler can attach to it. Now looking at it I'm thinking that the adapter design can be detrimental to air flow, as you have the small hole in the center for the air to travel through, but you also have a flat approx. 3/8" around the hole. So any air traveling down from the filter hits the flat and can disrupt the air getting into the carb. Yeah I know, way over thinking it. :no:
But hear me out, old school racing time, when you wanted a straight shot of air getting to your carb you installed velocity stacks to direct the air straight to the carb.
Now finding a tiny diameter velocity stack is a bit of a problem. So here's what I'm thinking and what I built. A velocity stack to fit the coupler on the air filter adapter, but with a tweek. I made up a venturi to direct all the air from the stack into the hole on the adapter. At low speeds the engine doesn't need a lot of flow so the setup does really nothing. But at higher speeds instead of a bunch of tumbled air going to the carb, you would get a higher speed of more clean air going to the carb. Higher speed, lower pressure to help pull more fuel/air to the head.
And just to be nuttier than a jay bird, the velocity stack is a left over header collector connector, 3" long and 2 1/2" in diameter, with a trumpet end on it. The venturi is nothing more the the top of a Sea Foam can stuffed in the stack upside down. It's small opening is nearly a dead nuts match to the one on the adapter. For a filter I cut a piece of heavy screen that lays inside the stack on top of the venturi, with a piece of the foam filter from the non Hemi engine on top of that.
Engine fires up just like normal, but I swear I hear more of a cackle sound now from the stack, I guess the harmonics from when the intake valve slams shut. Engine seems to respond normally if not a little bit more snappier to the throttle. With the hurricane that just pushed by I haven't had a chance to see how it runs on the street, but I plan on testing with the old set up and then with the new to see if it actually did make a difference. ut:
I'd show you photos but the site still won't let me post them, so you'll have to use your imagination.
Flywheels/rods/cams/emulsion tubes/jets/ported and polished/22 pound springs/governor and low oil deletes, high flow air filters.
Okay as to the latter As most know you have an adapter that bolts to the front of the carb so the air filter coupler can attach to it. Now looking at it I'm thinking that the adapter design can be detrimental to air flow, as you have the small hole in the center for the air to travel through, but you also have a flat approx. 3/8" around the hole. So any air traveling down from the filter hits the flat and can disrupt the air getting into the carb. Yeah I know, way over thinking it. :no:
But hear me out, old school racing time, when you wanted a straight shot of air getting to your carb you installed velocity stacks to direct the air straight to the carb.
Now finding a tiny diameter velocity stack is a bit of a problem. So here's what I'm thinking and what I built. A velocity stack to fit the coupler on the air filter adapter, but with a tweek. I made up a venturi to direct all the air from the stack into the hole on the adapter. At low speeds the engine doesn't need a lot of flow so the setup does really nothing. But at higher speeds instead of a bunch of tumbled air going to the carb, you would get a higher speed of more clean air going to the carb. Higher speed, lower pressure to help pull more fuel/air to the head.
And just to be nuttier than a jay bird, the velocity stack is a left over header collector connector, 3" long and 2 1/2" in diameter, with a trumpet end on it. The venturi is nothing more the the top of a Sea Foam can stuffed in the stack upside down. It's small opening is nearly a dead nuts match to the one on the adapter. For a filter I cut a piece of heavy screen that lays inside the stack on top of the venturi, with a piece of the foam filter from the non Hemi engine on top of that.
Engine fires up just like normal, but I swear I hear more of a cackle sound now from the stack, I guess the harmonics from when the intake valve slams shut. Engine seems to respond normally if not a little bit more snappier to the throttle. With the hurricane that just pushed by I haven't had a chance to see how it runs on the street, but I plan on testing with the old set up and then with the new to see if it actually did make a difference. ut:
I'd show you photos but the site still won't let me post them, so you'll have to use your imagination.