[Shotimes] New +20 cam dyno results

[Ron Porter]

John Hrinsin may chime in on this after the weekend (I think that he's also
on SHOtimes), but I thought that a/f in the higher rpm ranges on SHOs was
actually better in the 12-ish range?

It didn't seem to me that 11.5:1 was that far off. In act the move from 13:1
down to 11.5:1 sounds like what some folks have found to be desirable.

Might also get more "hits" on the topic on Tech SHO from folks like Gary.
I'll cross-post it.

Ron Porter

-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Leigh Smith
Sent: Sunday, May 29, 2005 11:02 AM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] New +20 cam dyno results

Oops.
My bad. No coffee I guess.
Regardless a shift all the way from 13 to 11.5 sounds too severe and should
noticeably affect horsepower.
Lee

----- Original Message ----- 
From: "Dave Kegel" <d.kegel@comcast.net>
To: "'Leigh Smith'" <leighsm@comcast.net>; <shotimes@autox.team.net>
Sent: Sunday, May 29, 2005 10:28 AM
Subject: RE: [Shotimes] New +20 cam dyno results


> Leigh,
>
> 11.5-1 is really rich, not lean.
>
> Dave
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
> On Behalf Of Leigh Smith
> Sent: Sunday, May 29, 2005 12:25 AM
> To: Donald Mallinson; shotimes@autox.team.net
> Subject: Re: [Shotimes] New +20 cam dyno results
>
>
> Don;
> It's the extra duration killing the torque. More specifically the
increased
> overlap. If you spread the cams out by advancing one and retarding the
> other, I'd guess you could get most of the torque back, by decreasing the
> overlap. Wider lobe centers don't hurt higher end hp too bad, and you do
> need the torque. Then you could advance both of them together to shift the
> power curve a little lower, or retard them both for higher. Of course,
> adjustable timing gears would be required. But you have got so much more
> tuning capability than a single cam motor. FWIW 11.5 sounds too lean, I'll
> bet there is more power there too.  Have fun! Lee
>
> ----- Original Message ----- 
> From: "Donald Mallinson" <dmall@mwonline.net>
> To: <shotimes@autox.team.net>
> Sent: Saturday, May 28, 2005 1:50 PM
> Subject: [Shotimes] New +20 cam dyno results
>
>
> > Just got back from the first dyno test of the '89 with the new setup.
> > Here are the details:
> >
> > Previous tests:
> > 205-207 hp at 6100 rpm
> > 196 lb ft at 4800 rpm  and 190 @ 3100 rpm (before runners open)
> > 180,000 miles on the car/engine now, test above done at probably
> > 165,000 miles. Engine is healthy using about 1/2 quart per 3000 miles
> > like it has since it was 45,000 miles young when I bought it.
> >
> > BOS basically, without a computer chip, running a Pro-Flo 77mm Maf.
> > Walker exhaust with generic turbo mufflers.
> >
> > New:
> > +.20 cams
> > EH intake runners
> > BBB
> > new cam belt, plugs, wires, with NO computer chip or tuning, same
> > setup otherwise as above.
> >
> > 220hp @ 6700 rpm
> > 182.5 lb/ft @ both 3500  and 5500 rpm  Torque basically flat between
> > these rpm's except for a slight dip when the runners open at 4000 rpm.
> >
> > Air/Fuel mixture is basically 13-1 from about 3700 to 5700 rpm and
> > then has a slow drop to 11.5-1 at 7000 rpm.
> >
> > First, I am shocked at the loss in torque, this is the exact opposite
> > of what I wanted.
> >
> > Second I am a bit disappointed in the HP gain, but maybe more is to be
> > had with some computer tuning.
> >
> > So tuner guru's..... a couple questions:  Where did my torque go and
> > will tuning get any of it back?  Is there more HP to be had?
> >
> > Don Mallinson
> > _______________________________________________
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> > Shotimes@autox.team.net http://www.team.net/mailman/listinfo/shotimes
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