Any Plug Readers Here ? - Page 2 - Chevelle Tech
Performance Our High Performance area

 13Likes
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
post #16 of 44 (permalink) Old Jun 11th, 19, 3:15 PM
Gold Member
Gene
 
Join Date: Sep 2000
Location: Buffalo NY
Posts: 14,589
Re: Any Plug Readers Here ?

To Rick's point, look at Jeff's ONE YEAR OLD plugs vs yours. Leaner the meaner man!

I pulled the 427's out after 400 miles. Look almost new.
Buzzbomb and jeff swisher like this.

Gene
ACES 3112/Team Chevelle Gold #62
Be big, be a 'builder'!
427L88 is offline  
Sponsored Links
Advertisement
 
post #17 of 44 (permalink) Old Jun 11th, 19, 4:44 PM
Lifetime Premium Member
Gerry
 
Join Date: Oct 2012
Location: CT
Posts: 914
Re: Any Plug Readers Here ?

FWIW
The porcelain has nothing to do with jetting. It can be bone white and still be running too rich.
Jetting shows up on the last thread ring with the ground strap welded to it.
Ground strap shows heat range of plug.
Porcelain shows preignition/detonation.

Reading plugs this way is only valid after full throttle run and turning ignition off immediately.
Coast to a stop and pull plugs.
Rokker likes this.

67 SS BBC
4.11's
bradley67 is offline  
post #18 of 44 (permalink) Old Jun 11th, 19, 6:52 PM Thread Starter
Tech Team
 
Join Date: Aug 2018
Posts: 502
Might be some confusion here between carbon and lead deposits.

Lead helps lubricate engine.
Reelysalty is online now  
 
post #19 of 44 (permalink) Old Jun 11th, 19, 7:54 PM Thread Starter
Tech Team
 
Join Date: Aug 2018
Posts: 502
Quote:
Originally Posted by B52bombardier1 View Post
Please know that "airplane fuel" is likely 100 octane Low Lead AVGAS. But its actually more lead than the best Sunoco 260 fuel that money could buy in 1970. A lotta' lead.

So some of that could be lead deposits and I would not worry about it.

Rick

Sent from my SM-G965U using Tapatalk
Looks like you’re dead on !

From Shell AvGas

As you will know, Avgas 100LL contains a compound known as Tetra Ethyl Lead (TEL) which acts as an octane booster for the fuel. This results in a fuel which is commonly known as a 100 Octane lean mixture and 130 rich mixture Performance Number fuel.

In practice it is even better than this, with ratings more like 106 lean mixture & 130 rich mixture which are far in excess of the comparable 85 - 87 octane of road fuels. To achieve this a lot of TEL is used - around 5 times the quantity that was used in the old Leaded automotive fuels.
Reelysalty is online now  
post #20 of 44 (permalink) Old Jun 11th, 19, 9:02 PM
Tech Team
 
Join Date: Mar 2017
Location: South GA
Posts: 304
Re: Any Plug Readers Here ?

Quote:
Originally Posted by jeff swisher View Post
I would keep an eye on the plugs and watch for faint lines on the outside where the steel nut area meets the white portion of the plug.
Faint lines going up and down the spark plug..those will be telling you it is misfiring.
Faint carbon tracking.
Tighten the gap if you see that.

I run my HEI sparked plugs at .035".
Here is a set of 4 from the right bank of my 906 vortec head 357" that runs a much modified 750 double pumper #4779.
These are AC 44 heat range plugs and been in the vehicle since June of last year.
AFR is 12.8 at wide open throttle and 13.5 was the last idle AFR I got.
Looks clean. Just curious what is your AFR at steady cruise?
anix is offline  
post #21 of 44 (permalink) Old Jun 11th, 19, 9:42 PM
Senior Tech Team
Rick
 
Join Date: Nov 2006
Location: Langhorne, Pa
Posts: 4,227
Re: Any Plug Readers Here ?

Quote:
Originally Posted by 427L88 View Post
To Rick's point, look at Jeff's ONE YEAR OLD plugs vs yours. Leaner the meaner man!

I pulled the 427's out after 400 miles. Look almost new.
Yes, exactly, I have pulled plugs out after each Drag Week and put them right back in to finish the season. After 1,100 miles and 10-20 passes they just about still look new.

1967 Chevelle Malibu 4 door


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


The 7.99 at 173mph pass:


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


8.02 at 171mph:


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Calculated Risk is offline  
post #22 of 44 (permalink) Old Jun 11th, 19, 10:11 PM
Senior Tech Team
jeff
 
Join Date: Jan 2008
Location: yukon ok.
Posts: 4,949
Re: Any Plug Readers Here ?

Quote:
Originally Posted by anix View Post
Looks clean. Just curious what is your AFR at steady cruise?

Last time it was checked was on a chassis dyno and it was 13.8 at a steady cruise at 2500 and 3000 rpm.
That was 11 months ago and I have changed valve lash since then as it seems my lifters like 0 lash.
I have pulled a very heavy 20 foot pontoon to the lake a few times and hauled many loads of dirt and scrap iron.
E10 and 100% gas has been ran through it. It's not picky really.


I gave it the jetting it liked best not caring what some AFR meter told me.
I have done that since I started playing with carbs as a kid though.


Give it what it likes and go on down the road.
I have tried leaner jetting and richer in both primary and secondary and keep going back to this jetting.


I drive a lot also.
Not near as much as I used to though.I used to drive 70,000 miles a year.. This one has about 15,000 miles on it.
Some days It gets driven 400 miles.
Rain and sleet, salt on the roads it gets driven.
It will see 7000 rpm a few times each time I drive it. Lead foot disease.
anix likes this.
jeff swisher is offline  
post #23 of 44 (permalink) Old Jun 12th, 19, 10:08 AM Thread Starter
Tech Team
 
Join Date: Aug 2018
Posts: 502
Quote:
Originally Posted by 427L88 View Post
To Leaner the meaner man
Burnt pistons, retarded timing,
Reduced HP, spark knock,
excessive engine heat is “meaner” ?
Reelysalty is online now  
post #24 of 44 (permalink) Old Jun 12th, 19, 10:35 AM
Senior Tech Team
jeff
 
Join Date: Jan 2008
Location: yukon ok.
Posts: 4,949
Re: Any Plug Readers Here ?

I have heard that saying Leaner is Meaner and I have said it and I thought i proved it at least to myself.
That was 30 years ago as my cars always went quicker and faster when i took jet out of them.

I would lean it down in the primaries until i got a lean stumble. then jet up until it was gone and add another .001 or .002 in jet size.

I would then play with the secondary side and watch tachometer and feel differences in shift recovery and see how hard it pulls from 6000-sometimes 7600 rpm.

Just about every carb needed leaned out a bit.

So "leaner is meaner" was often said.

Fast forward many years and my first dyno pull on a chassis dyno with AFR readout.

The owner at the dyno speed shop asked me if I had tuned the engine with a wide band..I said NO just the old fashioned way ..Like I stated in the above.

He said it was spot on and would not change a thing.

15.2 idle AFR 14.5 cruise AFR and 12.8 was wide open AFR.

I thought I was leaner... I was leaner than factory setting.
I have made pulls with as much as 18 AFR but much more power was made at the mid 12 to high 13 AFR.

Was i wrong all those years with the old saying. Or was it the fact we never checked actual AFR and most carbs were a bit fat to begin with.
jeff swisher is offline  
post #25 of 44 (permalink) Old Jun 12th, 19, 11:59 AM Thread Starter
Tech Team
 
Join Date: Aug 2018
Posts: 502
Quote:
Originally Posted by jeff swisher View Post
I

Fast forward many years and my first dyno pull on a chassis dyno with AFR readout.

The owner at the dyno speed shop asked me if I had tuned the engine with a wide band..I said NO just the old fashioned way ..Like I stated in the above.

He said it was spot on and would not change a thing.
👍. Bill “Grumpy” Jenkins didn’t own an engine dyno till late in his career and doubt he ever owned a wide band.
jeff swisher likes this.
Reelysalty is online now  
post #26 of 44 (permalink) Old Jun 14th, 19, 12:17 PM
Senior Tech Team
 
Join Date: Nov 2008
Location: Chevelle land USA
Posts: 1,864
Re: Any Plug Readers Here ?

How about this? 7 OF 8 looked like this.
Attached Thumbnails
Click image for larger version

Name:	PIG RICH.jpg
Views:	30
Size:	54.2 KB
ID:	595676  

Marc S


71 SS 454 ELCO
Edelbrock Proflo4
TKO600
Strange 12bolt w/4.10
1971ss454Elco is offline  
post #27 of 44 (permalink) Old Jun 14th, 19, 12:53 PM
Senior Tech Team
Ed
 
Join Date: Aug 2013
Location: Pittsburgh, PA
Posts: 4,204
Garage
Re: Any Plug Readers Here ?

Quote:
Originally Posted by 1971ss454Elco View Post
How about this? 7 OF 8 looked like this.

I would put yours at Pig Rich on the scale, or intentionally blackened with soot from acetylene.
And if 7 of 8 were like that, you probably have a 1cyl car now.
DUTCH MAX HEADWORK likes this.

1967 El Camino Malibu - Deepwater Blue
ZZ4 350, FiTech 600 complete!,Roadmaster tank, 700R4, Underdash A/C in progress, JGC Steering, 1990s truck serpentine.
Pioneer4x4 is online now  
post #28 of 44 (permalink) Old Jun 14th, 19, 12:54 PM
Moderator
Levon
 
Join Date: Jul 1999
Location: Priddis, Ab. Canada
Posts: 9,289
Re: Any Plug Readers Here ?

Back in the day I learned a lot from this read:

Spark plug reading can be complex and sometimes frustrating task this page will help make it easier and the results rewarding
DUTCH MAX HEADWORK likes this.

Levon Hovagimian
Team Chevelle #279
2015 Camaro ZL1 Summit White (Bone Stock)
70 Chevelle SS 454 LS5 4 speed. SOLD
Current Engine VortecPro 460 (513 HP) Original is resting
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1966 427 Corvette SOLD
1973 Camaro IHRA Hot Rod (LS-6 Auto)11.00 @121 (Chased a 10.99 or better) SOLD

Priddis Greens, Ab. Canada


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
LevonH is offline  
post #29 of 44 (permalink) Old Jun 14th, 19, 12:56 PM
Moderator
Levon
 
Join Date: Jul 1999
Location: Priddis, Ab. Canada
Posts: 9,289
Re: Any Plug Readers Here ?

Quote:
Originally Posted by 1971ss454Elco View Post
How about this? 7 OF 8 looked like this.

Check your ignition as well. Without it working properly nothing will burn.
DUTCH MAX HEADWORK likes this.

Levon Hovagimian
Team Chevelle #279
2015 Camaro ZL1 Summit White (Bone Stock)
70 Chevelle SS 454 LS5 4 speed. SOLD
Current Engine VortecPro 460 (513 HP) Original is resting
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

1966 427 Corvette SOLD
1973 Camaro IHRA Hot Rod (LS-6 Auto)11.00 @121 (Chased a 10.99 or better) SOLD

Priddis Greens, Ab. Canada


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
LevonH is offline  
post #30 of 44 (permalink) Old Jun 14th, 19, 12:59 PM
Lifetime Premium Member
Jim
 
Join Date: Nov 1999
Location: International Falls MN
Posts: 6,332
Re: Any Plug Readers Here ?

Here's a good one too.

http://gallery.myff.org/gallery/1486...ug+reading.pdf
DUTCH MAX HEADWORK likes this.

Jim

77 Monte
421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. from Jake 200-4r w/ 3.73's
Machine work by Torvinen's machine
11.93 @ 112.7 & tuning
67 Imp.SS for the wife 275 hp 327-TH350
77 cruiser is online now  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome