Thread: Cam specs correlating to cylinder pressure

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Thought about using one of these ?

Originally Posted by southerner

Thought about using one of these ?

Thats the best single item you can use on the top of a carb to help increase flow and the only time a velocity stack does any good is with one of those under it.A carb/hood scoop attached to the carb,does not come into use till about 90 mph and will do more harm than good on a street car facing forward and facing backwards its worse,draws air out into the low pressure behind the scoop and fights the carb ,forward it disrupts the carb signal untill about 90 then it creats a ram air effect increasing carb flow from pressure.It works to a point under 90 but the air builds and releases pressure confusing the carb signal .I have graph that shows ram air /cold air improvements over non ram /under the hood air.I think its like 2 percent at 65mph.But the graph covers none of the air flow variables from bumper to grill and hood variables.
Put your hand out the window on the freewayat 60 and feel the air pressure and how it changes constantly ,blowin harder then softer,this is what confuses the carb at the lower speeds,put your hand out the window at 90 plus and this disruption is not present ,just one constant force.JUst my take on it from what I have read and seen posted,just like all aftermarkett parts ,they have there specific use ,stray outside that intended use and all bets are off,performance usually drops.

Originally Posted by DennyW

Yes, those work, and I also use the different base plates to. This one works good for that dead spot. The venturi picks up the speed for better, and quicker flow.

Went to the site..............Theres a heck of a lot to choose from.. Now then, just to pick up on your carburetor knowledge, without causing to much uproar. Why did you pick that particular one ? And does it come from the shop like that, or did you modify it ? What type of manifold does it work best with ? And what size carb ?, I think I see it is a 4150, 4160 square flange Holley type. What else ?, what is the effective rev range that it works with or does it effectively broaden torue all around ?

tuning with spacers...
site of Barry Grant has a nice article on this:

http://www.gnetworks.com/v4files/bar...h%20images.pdf

Originally Posted by DennyW

Thanks for the link. That is pretty much what I was trying to explain.

that's why I understood what you were trying to explain...
kinda...hey, I've seen this before and not in another life