Carb to Hood clearance ?

so what is the minimun it should be .... from the vent tubes to the hood ? on a deal like mine were the cowl hood goes all the way to the windshield im i losing some hp ? and would i gaing any from going to a foward facing hood ?

ive also notice when im done with a pass to have red dye on top of the carb could i be have an reversion issue or turbulance issue with that hood ?


what do yall think

bruno wrote:so what is the minimun it should be .... from the vent tubes to the hood ? on a deal like mine were the cowl hood goes all the way to the windshield im i losing some hp ? and would i gaing any from going to a foward facing hood ?

ive also notice when im done with a pass to have red dye on top of the carb could i be have an reversion issue or turbulance issue with that hood ?


what do yall think

If your cowl does fit the windshield fairly tight, that is where it is going to pull the most air on a rear facing scoop. As far as clearance as long as you have enough that the vent tubes clear, you are OK. Do you have an air pan set up for the cowl??

richter69 wrote:A properly sized and fitted forward facing scoop can be worth some et and mph over a cowl.

I agree.

No Travis i dont have an air pan setup

Definatley worth the fab work. You will have to fatten the jetting a size or 2. I made this setup myself and sealed it off with armaflex pipe insulation. Only thing I wish I would have done is to have used an air bell at the carb entry.

Typically 3/4" above the vent does the job. The red dye is telling you that you have air blowing ACROSS the carb and thats a no-no.

Good luck. : )

Im going to ask a stupid question based on the pics and post Ive seen....

you asphalt guys dont run an air filter? Do you not have an issue with dirt/dust/rocks and etc making it into the engine? Does a standard K&N or similar rob that much horsepower to negate its use?

Obviously I cant get away without one but we are typically running the engine the same as most of you guys time wise just for a shorter distance and a little dirtier. Ive shied away from a pan because I dont want to chance water being trapped on top of the carb in a deep pit.

Regardless, Travis, what gauge aluminum is that?

Sorry to hyjack.

IcallhimGeorge wrote:Im going to ask a stupid question based on the pics and post Ive seen....

you asphalt guys dont run an air filter? Do you not have an issue with dirt/dust/rocks and etc making it into the engine? Does a standard K&N or similar rob that much horsepower to negate its use?

Obviously I cant get away without one but we are typically running the engine the same as most of you guys time wise just for a shorter distance and a little dirtier. Ive shied away from a pan because I dont want to chance water being trapped on top of the carb in a deep pit.

Regardless, Travis, what gauge aluminum is that?

Sorry to hyjack.

I believe its a matter of having the room for an air cleaner. Like bruno was saying, I too have a clearance issue with my vent tubes being close to the cowl so theres no way an air cleaner is going on there

PRO SYSTEMS wrote:Typically 3/4" above the vent does the job. The red dye is telling you that you have air blowing ACROSS the carb and thats a no-no.

Good luck. : )

PRO SYSTEMS,

What would you do to cure this problem ?

Nick

Be sure you have a way for air to pile up and not blow through the neighborhood. Forward facing scoops and pans work almost everytime. Cowl hoods work half the time on a first effort and often require tweaking. If you add a cowl hood air pan and the carb doesn't require adding 1-2 jets..get back to work..you're not done.

IcallhimGeorge wrote:Im going to ask a stupid question based on the pics and post Ive seen....

you asphalt guys dont run an air filter? Do you not have an issue with dirt/dust/rocks and etc making it into the engine? Does a standard K&N or similar rob that much horsepower to negate its use?

Obviously I cant get away without one but we are typically running the engine the same as most of you guys time wise just for a shorter distance and a little dirtier. Ive shied away from a pan because I dont want to chance water being trapped on top of the carb in a deep pit.

Regardless, Travis, what gauge aluminum is that?

Sorry to hyjack.

I think I used .040. I really can't remember. I wanted it stiff enough not to buckle when you shut the hood, yet not be to rigid to put extra pressure on the hood.

thanks guys.

Hyjack over.

bruno wrote:so what is the minimun it should be .... from the vent tubes to the hood ? on a deal like mine were the cowl hood goes all the way to the windshield im i losing some hp ? and would i gaing any from going to a foward facing hood ?

ive also notice when im done with a pass to have red dye on top of the carb could i be have an reversion issue or turbulance issue with that hood ?


what do yall think

Nick, On my ole Maverick i ran the old thunderbolt style tubes from a home made pan. It picked the et up a full 1/10 over none at all