Sumner, turbos / centrifugals will almost always be a better choice for blown gas and I don't think the blown fuel guys care.....
Yea, but the turbo's are not legal in vintage, and the centrifugal is not nearly as traditional as a roots blower!
Well, I was going to stay out of the hood scoop discussion, but can’t!
With all respect to the author of the new rule, it was written in response to a proposal I made, because the author feels that we should not be able to gain an aero advantage off of a hood scoop.
Sooo, let me see if I get this straight!
If I run an unblown car, I can have an 11” tall hood scoop.
If I run a turbo, or centrifugal blower, I can have an 11” hood scoop.
…BUT, if I run a roots blower, and my injector hat is 1” above the hood, I can only have a 3” hood scoop? REALLY?
Dan, you stated “
why does a front engine, top mount blower with a bug catcher need a scoop? You are bringing your own air with you, ” and that’s true, but I also have more drag because of it. Also, I get ’cleaner’ air by grabbing the air out in front of the car. So, because I run a more ‘traditional’ style blower, I’m to be penalized by being allowed less streamlining than a NA or turbo’d car?
The whole argument that “
The rule is aimed at those coupes and sedans that push the scoop rules beyond intent and make an aero device, which serves no purpose to the intake system, that streamlines the vehicle over and above the hood, to the windshield and over the roof of the car. “, seems contradictory to what we are doing. We allow some cars the aero advantage, and not others, yet are we not striving to find better ways, to go fast safer?
IMHO, this rule needs to be looked at again!
So, are hood scoops legal in altered class?
The cowl rule also has me a little concerned also. Last year, we were told that the cowl point that the streamlining was allowed to was the base of the windshield. The new rule leaves me wondering:
4.MM COWL:
added new definition
The cowl area is defined as the portion of the body bounded by the front fenders, the base of the windshield and the
rear edge of the hood as measured at the centerline of the vehicle.The hood scoop rule says we can go to the back of the blower, which on my car, is behind the back edge of the hood. Cowl rule indicated the cowl is between the windshield and rear edge of the hood.
So, at what exact point does the streamlining stop?