Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Blown 496 carbon fouling middle cylinders
User Name
lost password?   |   register now

Thread: Blown 496 carbon fouling middle cylinders Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-17-2012 10:57 AM
cobalt327 Mark the inner plugs so you know the position of the black side of the porcelain to the exhaust valve guide- you may be pulling oil in through the guides.
05-17-2012 09:50 AM
Blown 496 carbon fouling middle cylinders

What am I missing? I have been tweaking the idle on all eight corners to get the A/F at cruise from 12.2 to 13.5 range. I was using #1 as a guide going from light tan to gray as it leaned. I have an intermittent miss at steady speed and the MSD cap and rotor looked pretty crusty so I replaced them. When I pulled the plugs 3,5,4 and 6 were carbon covered and the others look like #1. Wires are all under 200 ohms and cranking compression is 160 on all 8 holes. After 50 miles last night the outer 4 are off white and the inner 4 are off white on one side and black on the other half of the porcelain.
Idle a/f is 12.3 and leans to 15 on light acceleration then will quickly drop in to 11's as I row through the gears. Same on highway.
My set up is:
8.3-1 496 locked 32 timing
420 megablower 1-1 6lb boost
Edel Perf RPM heads
dual 650 dp man ref Holley's QF blocks 9.5 pv's stock ifr
Lunati 114lca 109icl 240/245 @ .050 .647 lift hyd roller
29" tall Mickey's
3.90 gear
cruise at 60 in 4th - 2600 5th 1900

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 10:10 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.