William,
Hmmm,
On the dyno I noted leaner A/F numbers than on 5.2s and 5.9s... WOT was
running 11.9-12.3... Im wondering if the bigger cams may require bigger
injectors as well? Is the injector p/n for the HOs a different P/n than the
regular 4.7?
Bruce
----- Original Message -----
From: "Willliam H. Hiatt III" <william@hiatt.net>
To: <dakota-truck-moderator@bent.twistedbits.net>
Sent: Monday, September 09, 2002 12:01 PM
Subject: DML: 4.7L HO Again!
>
> In my never ending quest to solve Ed's (as well as my) pinging problem, I
> stumbled across this:
>
> The 4.7 flows 22.5 lb/hr @ 49psi, while the 4.7 HO flows 25.8 lb/hr @
49psi.
> Is this difference in the injectors, or is it all in the PCM? I'm thinking
> my pinging is because the truck is leaning out when you snap the throttle
or
> on acceleration.
>
> Also, the 4.7 valve springs are as follows:
>
> 6.69 coils
> 3.28 wire diameter
>
> While the 4.7 HO valve springs are as follows:
> 7.30 coils
> 4.77 wire diameter
>
> Is this something to warrant changing as well (I know it won't affect
> pinging/etc, but just for longevity sakes)
>
> And last but not least, the 4.7 HO spark plugs. They have a platinum rivet
> located on the tip of the center electrode. Why would Dodge run these
> platinum plugs in the HO?
>
> Thanks
> william
>
>
>
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