i just spent a lotta time learning about r/s ratio, now i wanna learn what the best way to "match cams" is, and exactly what it is.. just askin for a link or somethin to read.. thanks.
sorry if this is on the wrong forum, i got no problem with it being moved

 

match cams? like for your r/s ratio? or mix and match exhaust and intake cams in a dohc engine?

 

both

 

depends on what you want. i'll find some links to help you on understanding camshaft lift duration overlap and the like. from what i've learned lower r/s ratio is better for acceleration (torque) and not so much high speed travel, and higher r/s ratio is better for high speed travel (hp) assuming all things equal of course.

When i took my d16a6 for some high speed travel, stuck around 105 mph for over an hour the stress on the pistons against the cylinder walls was too much and the rings gave out and blew like a chinese penny *****. So the high r/s ratio keeps the stress on the pistons and such to a minimum.

The lift increases power while the duration puts the power high up in the power band

So assuming you're keeping naturally aspirated and you're basing your entire engine setup on the r/s ratio, high lift and high duration would produce power in the upper rpms, good for a high r/s ratio. Lemme find the links im sure they'll explain better than I.

http://www.auto-ware.com/combu....html

http://e30m3performance.com/te...atio/

the latter site just kinda explains the stress on the engine due to its geometry

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">the rings gave out and blew like a chinese penny *****</TD></TR></TABLE>
hahahahahaha

anyway, im thinking of going turbo.. my engine was completely built for n/a already, but i'm thinking of changing stuff to go turbo.. but before i do, i definitely hafta learn more about this stuff thanks for the info

 

People say that large rod ratios are for high RPM use, but this isn't entirely the case. Larger rod ratios produce excellent results all across the power band.

Check this article out: http://www.airflowresearch.com...1.htm

I know it's a domestic, but that's the kind of results you can achieve with a little more displacement and a little more rod length.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lke2drvgsr &raquo;</TD></TR><TR><TD CLASS="quote">i just spent a lotta time learning about r/s ratio, now i wanna learn what the best way to "match cams" is, and exactly what it is.. just askin for a link or somethin to read.. thanks.
sorry if this is on the wrong forum, i got no problem with it being moved </TD></TR></TABLE>

Usually lower r/s likes longer duration and less overlap.

If your exhuast ports flow less than 80% of your intake then a longer duration exhaust cam can help.