Question about...

[NRGZ28]

The same exact cam I'm running !! lol


----- Original Message -----
From: <timsiford at hushmail.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 16, 2000 9:45 AM
Subject: Re: Question about...


> Bob,
>
> I am running a CompCams Xtreme hydraulic roller.  I pulled the following
> specs off of Comps Site.  HOWEVER, I had this cam custom ground on a
112LSA
> (before comp offered that as a standard grind) and I am running the cam
> with 1.6 rollers as compared to the 1.5 ratings.  The specs below are for
> the 110 LSA version.  They didn't have the specs on the 112 version up yet
> ...
>
> PART # 08-422-8
> GRIND NUMBER: CS XR270HR-10
> ENGINE: CHEVY SM BLK 305-350
>                  INTAKE   EXHAUST
> VALVE ADJUSTMENT  HYD      HYD
> GROSS VALVE LIFT   .495     .502
> .006  TAPPET LIFT  270      276
> VALVE TIMING     OPEN     CLOSE
> AT  .006 INT     29 BTDC  61 ABDC
>          EXH     72 BBDC  24 ATDC
>
> THESE SPECS ARE FOR CAM INSTALLED
> AT  106  INTAKE CENTER LINE
>                   INTAKE  EXHAUST
> DURATION AT .050    218      224
> LOBE LIFT         .3300    .3350
> LOBE SEPARATION     110
>
> Tim
>
>
>
> At Thu, 16 Nov 2000 11:07:02 -500, rrauscher at nni.com wrote:
>
> >
> >
> >Tim,
> >
> >I was wondering what cam you are running in the 350. (I think
> >you once posted a CompCams). Believe it or not, with the Isky
> >cam that I'm running in a 327, I am also running 42deg of
> >timing at WOT (~12.6afr). Aluminum L98 heads. The difference
> >in how well the engine runs going from 36/38deg to 42deg is
> >substantial.
> >
> >I approached this value slowly and with caution. Apparently,
> >with this cam and the valve timing, it likes a lot of ignition
> >advance. I was surprised at my results. This is supposed to be
> >due to an early intake closing.
> >
> >It will be interesting to get some true wot afr readings. . .
> >
> >BobR.
> >
> >>
> >>Sounds like I am doing everything wrong ....
> >>
> >>160deg thermostat
> >>AFRs at WOT similar to the STOCK AUJP chip (curve shifted, slightly
> >higher)
> >
> >>Mega Timing
> >>
> >>Oh well.  Guess if I did it correctly then maybe I would be faster?
> > Maybe
> >
> >>my car will live longer?
> >>
> >>I tried less timing.  I tried less fuel.  I tried less timing and less
> >fuel.
> >
> >> The car really likes this setup.  And, with 12.2's @ 112 on the stock
> >bottom
> >
> >>end I am *-NOT-* complaining.  I have seen very very few L98s do this
> >so
> >>I must be doing something right.  Very good points made about longevity.
> >> This is not my daily driver ... actually hoping that I run it into
> >the
> >>ground so I have a reason to build my 420.  So, longevity is not my
> >goal
> >>here.  I'll give the car what it likes in order to get the best times
> >out
> >
> >>of her.  Admission: What it likes and what it -needs- may be two
different
> >
> >>things.  Understood.  But, it runs faster with what it wants.  I know
> >several
> >
> >>others with similar combinations (we compared bins) who are running
> >in the
> >
> >>11.8's/11.9's with a 383 all naturally aspirated (and those cars are
> >daily
> >
> >>drivers).  A good point is that I want to make is that these Air/fuel
> >ratios
> >
> >>and those timing numbers are only for WOT.  They are not for daily
> >driving.
> >
> >> They are not that way for 'normal everyday driving'.  My BLMs are
> >about
> >>128 across the board and the timing is conservative.
> >>
> >>Somehow though ... I don't think that I am running that 'calculated'
> >AFR
> >>at WOT.  I'll know in the spring when I take her to be dyno'd and get
> >a
> >>WB on it for a couple pulls.
> >>
> >>Thanks for all the info and the heads up regarding longevity.  I
appreciate
> >
> >>all the info.  All very good points.
> >>
> >>Does anyone have a similar setup and 30lb injectors??  What pulse widths
> >>are you guys seeing at WOT (at what RPMs)?
> >>
> >>Tim
> >>
> >>At Wed, 15 Nov 2000 22:08:32 -0500, "Bruce Plecan" <nacelp at bright.net>
> >wrote:
> >
> >>
> >>>
> >>>
> >>>That's what they do with the 160d Thermostats.
> >>>Notice how they normally are a let down, in measured performance,
> >but
> >>>still
> >>>are in business.  They exist cause the feel fast and joe average is
> >>>happy
> >>>with that
> >>>Bruce
> >>>
> >>>
> >>>> Seems this would be a 'trick' that unscrupulous chip makers would
> >>>use. fat
> >>>> top end and mega timing... risking the blueprint?
> >>>
> >>>> ----- Original Message -----
> >>>> From: Bruce Plecan <nacelp at bright.net>
> >>>
> >>>> > Also, have said rich and too much timing feels fast yet folks
> >still
> >>>do
> >>>it
> >>>> > all the time.
> >>>> > It just feels so good, folks do it.
> >>>
> >>>------------------------------------------------------------------
> >--
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