 Spark Plug reading Help |
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| tornik550 |
 Jul 26 2010, 09:32 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
I am in the process of tuning my carbs. I had been dealing with some significant rich running issues that I posted in a previous post. That issue is resolved. Now, I am able to drive the car however it seems to hesitate at cruising speeds (2500k rpm). Idle seems a little rough.
I am a novice at reading spark plugs. I am looking for opinions on this plug. The other plugs look the same except the white on the electrode only goes a little past the curve. I should note that the timing was a bit too advance and has been dialed back a slight bit. My guess- little too rich, too hot of spark plug and timing too advanced. Setup info- Dual weber 40 idf- recently sync'd idle jet- 60 mains-145 air correction jets- 200 emulsion tubes- f11 vents 32 Spark Plugs- NGK BP7ES Engine- 2.27l I should also note that I have a lot of spark plugs laying around. Doe anybody know if a NGK BP8ES is hotter old colder than BP7ES (think its colder). Attached thumbnail(s)   Attached image(s) 
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| yeahmag |
Jul 27 2010, 01:04 PM
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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You can get Innovate LM-1's used all day long for $250 or less. It's the best investment you will make... Typically you jet by the size of the venturi and not the size of the engine. That being said there are many variables including but not limited to:
* Fuel (% of ethanol and other oxygenating additives) * Engine efficency * Exhaust System (see above) Like Jake said, looking at plugs with todays modern fuels is extremely difficult. Get it on a wide band and when in doubt jet on the rich side. I think your plug gaps are fine with an MSD. I run .045" with a Mallory 6AL and a Bosch Blue Coil. |
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Posts in this topic
tornik550 Spark Plug reading Help Jul 26 2010, 09:32 PM
Mark Henry Way to lean!
engine specs? Jul 26 2010, 09:36 PM
tornik550
Way to lean!
engine specs?
For my future r... Jul 26 2010, 09:45 PM Kirmizi http://www.dansmc.com/Spark_Plugs/Spark_Plugs_cata... Jul 26 2010, 09:36 PM tornik550 I realize that it may sound dumb that I am asking ... Jul 26 2010, 10:32 PM Vacca Rabite I am using nearly the same jetting on a 2056.
I t... Jul 27 2010, 06:20 AM tornik550
I am using nearly the same jetting on a 2056.
I ... Jul 27 2010, 06:26 AM Mark Henry Here's a "how to" on webers I found ... Jul 27 2010, 07:08 AM 9146986 Larger carbs are probably NOT the answer, especial... Jul 27 2010, 07:12 AM '73-914kid The plug even shows that the timing was too advanc... Jul 27 2010, 07:43 AM tornik550
The plug even shows that the timing was too advan... Jul 27 2010, 08:25 AM ME733 .Your / the plug gap appears to be excessive...to ... Jul 27 2010, 11:21 AM tornik550
.Your / the plug gap appears to be excessive...to... Jul 27 2010, 12:23 PM ME733
.Your / the plug gap appears to be excessive...t... Jul 28 2010, 08:45 AM Jake Raby Reading plugs from engines with unleaded fuel is d... Jul 27 2010, 12:01 PM '73-914kid
Reading plugs from engines with unleaded fuel is ... Jul 27 2010, 02:07 PM |
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