730 rev limit

[Dave Zug]

Thanks Zacek.. the barrier thing is what I'm fighting. the motor hits a wall
at 6300. the valvetrain/springs/lifters were ecpected to perform better
together but the lifters are oem GM hydraulic rollers. There are apparently
2 part numbers for 5/7L, 5.0L, and ZZ crate motors (depends on the source..
the ZZ's are listed as having one and the other) lifters....weaker 5234890
and stiffer spring 17120735's.  One other suggestion was that "heavy" stiff
springs can actually REBOUND and cause float with certain cams.
eeeeyughhhh.

My problem aside.. thanks for the input.. the '730 is capable of 7k..
good... I can eliminate that.




From: Zacek DenniS <bowtye8 at yahoo.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, May 27, 2001 6:43 AM
Subject: Re: 730 rev limit


> I did the 870 to 7730 conversion and swapped in a
> solid roller this past winter to shoot for a 7000 rpm
> shift.
> No problem.  I have a 7000 MSD pill and the 7730 is
> set ot somthing like 9999rev fuel cutoff.
>
> Actually I would like to know if the 7730 will rev
> past 7200. I know of a few guys running 93 LT1 factory
> ecm's (9278-I think)  They are both hitting a 7200
> barrier. Both motors are built for 7500+,have after
> market ignition(eltro motive)
> My lower end is not that strong to try for 7400 /
>
> Dennis
> --- Dave Zug <dzug at delanet.com> wrote:
> > I've re-subbed.. is everyone here or are we still
> > recovering?
> >
> > I'm having some wierd stuff happening here with a
> > '730 running AUJP. The
> > motor.. which has a rev-kit, lightweight valvetrain
> > components and 130#
> > springs is cutting power at about 6300 - 6400 RPM.
> >
> > fuel is good, spark is good, ..,..,..  there is NO
> > rev limit set..we've
> > checked or replaced many things on this motor to no
> > avail. We've SCOPED the
> > injector signal (dual-fire TPI V-8 car) and the
> > results are sketchy there..
> > need to do it again.. looked like the signal locked
> > to ground for a bit in
> > ONE test and was fine in another.
> >
> > I'm wondering if the backup logic on the netres is
> > failing when it sees HIGH
> > RPM.
> >
> > anyone have any clues??
> >
> > ANYONE USING THE 730 to rev to 7000 rpm please let
> > me know that it is
> > possible.  Thanks.
> >
> >
> > PS.. ANHT HAC rev limit comments need a bit of
> > help.. the limits are based
> > on DRP's, and higher values mean lower RPM limits.
> > I'm sure you all got
> > this but there it is again.
> >
> >
> >
> --------------------------------------------------------------------------
--
> > To unsubscribe from gmecm, send "unsubscribe gmecm"
> > (without the quotes)
> > in the body of a message (not the subject) to
> > majordomo at lists.diy-efi.org
> >
>
>
> =====
> Dennis Zacek
> http://geocities.com/bowtie8
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Auctions - buy the things you want at great prices
> http://auctions.yahoo.com/
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org