[Shotimes] Valve lash done.....but car seems weaker now.

[Bruce Malachuk]

I'll be finishing up my online version of my valve worksheet later tonight.
Most of the valves got tightened up a bit, but I also was lacking in many of
the shims I needed to to the job completely. I'm gonna end up with the
covers off again this spring and I'll be ordering up shims so that I can get
everything to the same specs. Since I have the numbers now and I can't see
them changing much over the next 3 to 4 k. I really wanted to get everything
to the same, but the shoshop kit was lacking seriously in the sizes of shims
I needed. I do how ever have 2 very tight intak valves now on the back bank
which cause of a lack of shims I ended up setting to a gap of .127mm vs the
.15 recomened low end. I have heard of others setting thier shims
agressively like that for added lift. But I didn't want to make a habit of
it. My cams show a light wear/polished spot at the end of the lobe, but from
many of the pictures I have seen it appears to be normal. Hopefully they
could still be used as a core for the Stage I cams this summer. Anyhow, I'll
have my valve worksheet done tonight along with a mass of pictures if anyone
is interested.

Bruce

----- Original Message -----
From: "Ron Porter" <ronporter@prodigy.net>
To: <dmall@mwonline.net>
Cc: "SHOtimes" <shotimes@autox.team.net>
Sent: Saturday, February 22, 2003 2:43 PM
Subject: RE: [Shotimes] Valve lash done.....but car seems weaker now.


> In most cases, it's not probably anything that the "butt dyno" can detect.
>
> OTOH, he did say that he set them to the tight side. If they were very
loose
> to start, the difference "may" be noticeable. It doesn't seem to take more
> than a few lbs/ft of torque on these cars to matter. An example are the
> underdrive pulleys. These only add a bit of torque throughout the range,
and
> only maybe 5 HP at the peak, but they can be readily felt throughout the
> entire rpm range. From my experience, the "butt dyno" gets more accurate
> over time as you get a lot of driving in one particular car.
>
> Or.....it could just be the weather or the gas quality as others have
> mentioned.
>
> Ron Porter
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net
> [mailto:shotimes-admin@autox.team.net]On Behalf Of Donald Mallinson
> Sent: Saturday, February 22, 2003 2:27 PM
> To: shotimes-admin@autox.team.net
> Cc: SHOtimes
> Subject: Re: [Shotimes] Valve lash done.....but car seems weaker now.
>
>
> Ron,
>
> Considering the narrow range of adjustment recommendations
> on the SHO shims, wouldn't it be correct to say that while
> your explanation of gap and torque is correct, that the
> difference would be so small between minimum correct gap and
> maximum correct gap, that the torque (or lack of) would be
> VERY hard to detect on a "butt" dyno?  Maybe you could pick
> it up on a real dyno, but with the loss of power he is
> talking about, I don't think you could even come close to
> accounting for it in just doing a "towards the tight end"
> valve adjustment?
>
> When I did my valves, I just shot for the middle, assuming
> it was the ideal from the factory, and they did a pretty
> good job.
>
> Don Mallinson
>
> Ron Porter wrote:
> > Bruce, just go buy the numbering on the coils, and route to the correct
> > cylinder. (1-3 in the rear from pass. to drivers side, 4-6 in the
front),
> > forgetting about the manual......in this case, the manuals are more
> trouble
> > then they are worth.
> >
> > Also, on your loss of power. A wider valve clearance is better for low
and
> > midrange torque, while dropping high rpm power. A tighter lash is better
> for
> > the high-rpm power, but can lower the midrange torque. Torque on the
SHOI
> > motor is rather low, and the car (being rather heavy) is sensitive to
> > changes. The feeling of acceleration is primarily the gross torque at a
> > given rpm, so I believe that this is the issue. If you would have done a
> > dyno run before & after the 60K, you would most probably see a higher
peak
> > HP, but probably a lower torque curve down in the rpm band.
> >
> > Ron Porter
> >
> > -----Original Message-----
> > From: shotimes-admin@autox.team.net
> > [mailto:shotimes-admin@autox.team.net]On Behalf Of Bruce Malachuk
> > Sent: Saturday, February 22, 2003 11:23 AM
> > To: SHOtimes
> > Subject: Re: [Shotimes] Valve lash done.....but car seems weaker now.
> >
> >
> > I used the helms manual for the plug wires, but I'm gonna check them
again
> > just to be sure.
> > _______________________________________________
> > Shotimes mailing list
> > Shotimes@autox.team.net
> > http://www.team.net/mailman/listinfo/shotimes
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