165 MAF Computer

[Programmer]

110 lobe centres, 206 int, 212 exh with a lobe lift of
.320 int and .325 exh.

I recall the factory CS808 cam being a 112 lobe centres,
192 int, 202 exh and lobe lift of .269 int and .276 exh.

1.6 ratio rockers were used...

Lyndon.
----- Original Message -----
From: Bruce <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, June 30, 2001 2:38 PM
Subject: Re: 165 MAF Computer


>
> Kinda beating a dead horse here, but what were the Comp Cam specs
(roughly)
> Bruce
>
>
> ----- Original Message -----
> From: "Programmer" <nwester at eidnet.org>
> To: <gmecm at diy-efi.org>
> Sent: Saturday, June 30, 2001 3:17 PM
> Subject: Re: 165 MAF Computer
>
>
> > Perf Trends software extrapolated numbers were:
> >
> > Peak TQ 4250 RPM 303 ft/lbs
> > Peak HP 5250 RPM 269 HP (CS808 SpeedPro Cam)
> >
> > Peak TQ 4500 RPM 312 ft/lbs
> > Peak HP 5750 RPM 313 HP (XR258H-10 Comp Cam)
> >
> > The basic power curve followed the CS808 almost spot for spot all the
way
> > through
> > the TQ and HP curve till it got past 4500. That was the only change--and
> an
> > equal power fall off...anyways--it's all my fault. Like I said, I'd have
> > loved to
> > have this rig here...
> >
> > Lyndon.
> >
> > ----- Original Message -----
> > From: Bruce <nacelp at bright.net>
> > To: <gmecm at diy-efi.org>
> > Sent: Saturday, June 30, 2001 12:53 PM
> > Subject: Re: 165 MAF Computer
> >
> >
> > >
> > > If you want a glass smooth idle and performance then you're going to
> need
> > > NOX, or Supercharging.
> > > Looking at that cam, I can't see where you expect to make any serious
> HP.
> > >
> > > You might be having so much reversion that the MAF is just all
confused
> > > about what's going on.   You may have such a weird combo., that it
just
> > > won't breath thru a throttle body as opposed to a 4 barrel.
> > >
> > > I'd check things really close, leak down, compression, and then cam
> > timing,
> > > and have another cam standing by for reassembly <g>..
> > > Bruce
> > >
> > >
> > >
> > >
> > > From: "Programmer" <nwester at eidnet.org>
> > > Subject: Re: 165 MAF Computer
> > > > >>If your maf is reading properly and you are only reading 175
> grams/sec
> > > > then
> > > > your system just isn't flowing much air.<<
> > > > That's exactly what I tried to tell them, too !! That's the point at
> > which
> > > > the S10 just
> > > > quits pulling...it'll gain a higher MAF value, but never pulls hard
> past
> > > > 4500 RPM.
> > > > They've built rigs with exactly the same bottom end with carburation
> and
> > > > have never
> > > > run into these problems...the cam in use now is a 110 lobe centre,
> > 258/264
> > > > and
> > > > .480 and .487 exh. From the dyno software I use, this thing should
> have
> > > > gained around
> > > > 50 HP above 5K--instead it lost about 50 HP. Worst thing was I
> > recommended
> > > > this
> > > > cam above the stock camshaft--since we didn't want to get into a
lopey
> > > idle.
> > > > How do you tell a race shop that's built a bazillion race engines
that
> > > this
> > > > last one with
> > > > all the whizziest parts isn't flowing air ??
> > > > Lyndon.
> > >
> > >
> >
>
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> > >
> >
>
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