when i rebuilt my engine, i put it back together as close to
stock as possible, but i wanted a little extra pull so i put a
mild street cam into it. how 'wild' the cam is that you install
will determine what other modification must be done. i.e. if
you install a cam that has a profile to support high revs, you
have to make the engine breath easier to get the most from it.
(headers, carbs, port & polish...)
--- Craig Smith <CraigS@iewc.com> wrote:
> Question on cams !
>
> If a cam is added to an engine what "must" also be changed ?
> Parts that is,
> ie header, carbs, dizzy ?
>
>
> -----Original Message-----
> From: nikolai jaremka [mailto:njaremka@yahoo.com]
> Sent: Tuesday, November 02, 1999 8:16 AM
> To: spitfires@autox.team.net
> Subject: Re: Cams
>
>
>
>
> that first cam (from spitbits) looks like the one i got from
> BPNW. it came with a spec sheet that said it had a power band
> starting around 2200rpm. i am very happy with it, and it gave
> a
> noticable increase over stock with no other improvements to
> the
> engine or exhaust or intake. since then, i've changed part
> piece-meal to determine what made an improvement and what
> didn't. i guess what i'm saying is that it made good
> improvements to the spitfire without taking anything away from
> it's streetability. also, i can get an even idle at as low as
> 800rpm. (i was told it would have to be at 1000rpm to be nice
> and smooth)
>
>
> --- "Bowen, Patrick A" <PABowen@sar.med.navy.mil> wrote:
> >
> > I am getting to the point in my restoration where I need to
> > select my cam.
> > I have a good stock cam, but since I am making other mods, I
> > would like to
> > add to this. I currently am running a 1500 engine, with
> high
> > compression
> > pistons, weber DGV, and header, oh and no emissions gear
> > (since I am
> > ignoring any and all emission laws anyhow, don't let those
> > enter the
> > conversation). I want a good streetable spit, but with some
> > power. I don't
> > mind having to take idle up to 1000 or 1200 rpm if that is
> > required. I
> > spoke to Nigel at Spitbits and he recommeded his cam that
> has
> > the following
> > specs. he said its power was from 3000 to 6500 I believe.
> >
> > .415 intake lift 272deg duration
> > .400 exhaust lift 270 deg duration
> > with the intake timing being 22 - 70
> > and the exhaust timing being 62 -28
> >
> > and here are Ted Shumachers specs from his web page.
> >
> > B .409" 280 degrees 3500-6000 Good mid-range $110
> > TSI275-4 .425" 275 degrees 3000-6500 Flat power curve $125
> > A-6 .391" 288 degrees 4000-7000 Marginal for street $140
> > A-8 .465" 290 degrees 4500-7500 Race only $140
> > TSI298-4 .485" 298 degrees 4500-8000 Race only $140
> >
> > What is all this information I am looking at and what is the
> > list
> > recommendation for a cam? what will I get with each of these
> > cams. Or
> > should I just keep a stock cam?
> >
> > Patrick Bowen
> > '79 Spitfire
> > Jacksonville FL
> >
>
>
> =====
> nikolai jaremka
> 72 spitfire mkIV
> east aurora, new york
>
=====
nikolai jaremka
72 spitfire mkIV
east aurora, new york
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