yellow1995Cobra said:
So lets say the valve is the smallest thing on the exhaust side. Its like a funnel then, starts small, gets bigger(primarys) then stays at that one point till the tips. Lets say you grab a funnel from the garage and blow air through it, then take a large straw of some sort, the same size as the funnel begining, which one moves more air?
So basically what your telling me is that on my old 418, i should have had only 1-5/8 longtubes? Since the exhaust valves were only 1.60's. Thats pretty much what im getting from what you said. Id love to do that, just to see how much power I LOST, it would be insane. I guess the 1-7/8 headers, and 1-3/4 headers are pointless then right? Just a gimmick?
Listen, im telling you what the guy who designs the headers at Accufab told me. He deals with headers all day everyday and has tested them time and time again on the dyno so i think he knows a thing or two
He also says that h-pipes make more power than x-pipes....so i guess he is crazy about that too.
With my 1.60 valve he told me the best thing to run is the 1 3/4" and that the 1 7/8" stepped would be of no benefit(atleast not for the price).
You sound a big offended or upset, calm down.
And on your little example above with the straw and funnel, im not so sure i agree with you. An engine will be pushing the same force with the same amount of air. The funnel just gives less resistance to blowing so the air probably moves slower than the same air in the straw. Thus, thats why small intakes are used for velocity...to move the air. Do big intakes move more air? Hmmmm maybe if there is more room for more air to be brought in, but most of the time bigger intakes just equal the same air but going slower.
So would exhaust moving faster or slower be better? This is the way i think about it, im not sure what George would think. Im not sure how a funnel would move MORE air than a straw of the same entry size, i think the velocity of the air would be changed.
Again, the last part of my initial thinking of your experiment is just my thoughts for the discussion. I dont know enough stuff about exhaust systems to say "Im right and you are wrong", im just throwing stuff out there to be educated.
And if a funnel is better than a straw, then why do people stick with 2.5" exhaust systems instead of 3"? (ofcourse until they make the power to support it.)