high rpm "popping" sound

[Raymond C Drouillard]

I have the rev limiter in my Pro-Jection set at 5300 RPM.  Where is yours
set?  I have found that bouncing against the rev limiter sounds a bit
like a miss.  It will cut out for a fraction of a second, and cut back
in.  It'll keep repeating this until you let up on the throttle.

In your recording, you should see the injecter volume cutting in and out.

Ray Drouillard
'89 Grand Wagoneer with Holley Pro-Jection 4Di
(and lots of other stuff)


On Mon, 06 Apr 1998 14:18:54 -0500 Squash <mpc at genevaonline.com> writes:
>I was out 4-wheeling (yup, in the mud) sunday and noticed something. 
>This is my first high-rpm run with this truck/motor.  4500-5000 rpm, 454
>with holley projection, 268 cam, headers, alum intake, etc.  It sounded
>like an ignition miss.  I have a new accell blueprint HEI (electronic
>advance) with all new accell parts except the coil, which is probably
>100 years old.  Also running 34 degrees total ignition advance.  I
>recorded a run on the laptop, and analyzed it.  I could not see much of
>a pattern except that it only occurs over 4500 rpm.  The O2 almost the
>entire time was around 60 mV.  Normal cruising usually reads around 85
>mV.  Here's the question(s):
>
>Will the O2 read correctly under very heavy throttle (50% and up), and
>if so, does 60mV sound lean, and could my popping sound be from running
>lean?
>
>Could this be my ignition?  The only original part is the HEI coil.  The
>spark plugs are brand new and gapped according to the manual (can't
>remember what, tho).
>
>And lastly, could this be valve float?  I know that big-block chevrolets
>are known to do this, but i have never experienced it, so i don't know
>if it is or not!
>
>Thanks in advance for everyones help.
>-- 
>Andy Quaas
>

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