Spark Plug reading Help |
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Spark Plug reading Help |
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) |
ME733 |
Jul 27 2010, 11:21 AM
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#2
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
.Your / the plug gap appears to be excessive...to big...., the fuel air ratio is lean...the engine is running lean.....go down on the air correction jet as a starting point ..one jet size.........and the accelator pump jet size and fuel volume might need to be richened up......Check the plug gap FIRST.... .028 ths.....What oil are you using?...dino or synthetic?...how new is this engine? is it broken in yet?...rings seated?...
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