ikari899

ahh yes teachers i dont understand... my last 2 physics teachers... not so hot im supprised i got a B in the last class i was taking.

any way a problem with guessing the length of the 26r runners is that no one really know from where they are measured. they could be measured from inside surface of housing to a tangent plan on the end of the runner who knows... just realized that... maybe at seven stock if they have one out im going to run over and whip out my measuring tape . who is going btw?

and i would like to send any one i can the spread sheets i made so they can look over them and see if i did any thing wrong.

rotarygod

iTrader: (1)

I'll be at Sevenstock again this year. You aren't going to see one unfortunately. My friend Paul at Mazmart has an adjustable length manifold sitting on the shelf in the back. I'll have him measure it.

Whizbang

so in a PP application, the runner length is assumed longer then a sideport? what about the effects of force induction on this?

ikari899

wooo seven stock!!! This is my first year going. And if they could measure the 26b adjustable manifold that would be great!

Any way there seems to be a common misconception about forced induction.

Now for turbos, which is the most commonly used method of forced induction, they can be summed up into one very simple description. It is that a turbo simply changes the air pressure the engine thinks it’s operating in (I know this is not perfect but it works well for many cases). Waves to do not go away in different pressures in fact they do not even change speed (supposedly even though I still don’t believe it) they change speed with the gases temperature, or at least sound waves do.

SO this means that NA, forced induction what ever the runner lengths will not change IF you still want the effect at that rpm. BUT with forced induction because it is “forced” you can tune the manifolds for where the engine needs help most, right before the turbo spools. Now don’t think you can tune a manifold for 2000 rpm and the thing will start boosting there, it will make more power there then it did if the manifold was tuned for 3000 rpm. It is always a percentage gain and you get diminishing returns as you go lower and lower. So you will gain more hp/torque when you tune for a higher rpm because it is a percentage.

But I thought you wanted to get the greatest area under the torque curve for the best acceleration?!?!

Yes, yes you do so you have to make the choice wisely as to what rpm will most increase the area under that curve. Then other things such as gear ratios the type of racing etc come into play, but you know all that already so now its just a guess as to what will make your car the fastest, and preference.

SirCygnus

iTrader: (1)

actually, im able to have the ability to look at a 26b intake with the authentic trumpeting valves.

ikari899

ooohhhh really now... would you like to share some lengths with us?