Beer

Just something I've always wonder. Looking at Summit's intake list, I see all the various intakes listing rpm ranges of "idle to 7200", "1500 to 6500", etc. For just street use and maybe a little light to light foot stomping, what is the best way to go? Does an intake that goes from "idle to 7200" better than say "1500 to 6500" This is assuming that you are going with a dual plane intake setup, say either a holley 300-36 or an edelbrock rpm air-gap. Is there a big difference between a starting point of "idel" or "1500"?

78 Vette

The less mods you have the lower you want the intake to start. So if your motor is stock then 1500 is good. a mild cam 2000-2500 and so on.
:thumbs:


[Modified by 78 Vette, 1:16 PM 3/11/2004]

verskel

Keep in mind these are 'advertised' specs.

I think the weiand stealth is the one that's Idle-7200rpm. This is a very wide range and though it's a good intake those #'s vary on 'how much' power is made for different engine setups. I'd also look at the 'PEAK' power gains for each intake and if your setup is close to stock - stay away from manifolds 3000rpm and up ! ;)

Now, it also depends on where you want the power added. Is this performance better off-the-line or do you like to 'punch' it on the highway ?

Keep in mind, on the hwy. you're already at 1500-2200 rpm so you'll want your intake to be making power for you in the 1500 & up range. :chevy

Vetterodder

Those ranges are rough guidelines and don't necessarilly apply to all applications. Typically, they assume 350 ci so you could expect a higher rpm capability if used on a smaller engine or a lower rpm capability if used on a larger engine. The upper and lower figures they advertise don't mean that the intake is a dog below or above that rpm but that is where they perform best on a typical engine. For example, the Edelbrock Performer (advertised to 5500 rpm) is probably superior at 6500 to many o.e. or older after market intakes. By the same token, the Performer RPM (advertised 1500 - 6500) doesn't give up much low rpm power in exchange for it's better high rpm capabilities. Which intake is better for your particular application will depend on which engine you have and any other mods to it.