Re: Superchargers

From: KenCo (ken@kencofish.com)
Date: Mon Nov 24 2003 - 23:52:00 EST


Josh Battles wrote:
>
> I guess i'm at a loss here. i helped my friend put a 4-71 blower on his
> 'vette over the winter and we basically just replaced the intake manifold
> with a plate that sat in there that the blower was bolted down onto. It had
> all the ports in it like an intake does. Maybe I'm not understanding what
> you're trying to say.
>

a "made" manifold has the mounting surfaces the same as a blower base,
were talking a spacer/adaptor here.

>
> So, if the length of the outlet is perportional to the engine size, for you
> to be able to use on on a V6, wouldn't you have to then find one that came
> off of a V6? If you could find one of those, making the mount to secure it
> to the top of the engine would he relatively easy i suppose.
>

just use the #'s 4/71 = 4 cyls. that are 71 cu in per cyl
4/53 = 4 cyls x's 53 cu in. etc etc.

so, 4/53 = 212 cu in at 1-1 ratio. 4/71 = 284 cu in and so on.
in a racing engine they are overdriven to whatever boost is needed.
there are charts on the web that show what pulley combo = PSI boost.

Ideally an 8/71 that is underdriven would last the longest vs a
4/71 that is overdriven. easy huh? lol

but on a V6 the 4/71 at 1-1 would probably be perfect then overdrive
it a tad if needed for whatever boost is wanted, usually 5-10 PSI at
running speeds. remember its not a turbo and the boost always is
constant.

the next fly in the ointment is that 53 series rev higher (3200-3700
rpm)
normally than a 71 (2100-2400 rpm) so the stock 53 series will probably
last much longer. remember racing apps. were for big blocks so the 71's
were used and smaller engines dont need the CFM.
 

> wouldn't either intake manifold be designed to the air to flow in?

AH HA! nope :)
a pressure type turbo or blower manifold is actually setup diff.
because the air is "pushed" in, easy to see the baffles/dams in a
naturally aspirated vs smooth walls of pressure manif. types.

 
> What would that accomplish? that's basically the same idea as using an
> aluminum plate to cover the belly pan. I was talking about doing something
> similar to the M1 2bbl for the V6.

a huge plenum area, think of the old "tunnel ram" type manifolds.

you could also sit that blower even w/ top of hood rather than just an
air
cleaner sticking out. If ya really got it in there, flaunt it ;P

 

--
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