Crazyquik

Longer runners are for _______ ans shorter runners are for ______?

Or, is it not that simple?

J.

VAP

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Crazyquik:
<strong>Longer runners are for _______ ans shorter runners are for ______?

Or, is it not that simple?

J.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With the same size runner the longer it is the more better it will generally perform down low The shorter the runner but with the same cross sectional area (same i.d)would perform better higher up in the rpm range......

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Crazyquik

Ok, I was pretty sure someone was going to answer like that. Now, why do these high rpm intakes have long runners?

<img src="http://www.execpc.com/~lewenz/man1.jpg" alt=" - " />
<img src="http://www.krepower.com/pic%5CMani2.jpg" alt=" - " />

J.

y2khawk

iTrader: (5)

Those aren't long <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

I'm in the middle of modding my holley for a short runner setup to go for more high RPM flow.

The stock manifold measures something like 12" or 13" plus the length of the port.

I've shortened my runners to about 9"

You will give up some lowend doing this, but i don't care <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I know there's stuff out there online about it, but all i've got is on paper. Guess you could hit the good old public library and do some digging on helmholtz tunning and manifold design <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />