PLUG GAP on blown sbc ??? please help
#1
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Join Date: Jun 2009
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PLUG GAP on blown sbc ??? please help
Hi, thanks in advance for the help!! I have a 414 sbc 8-71 dbs blower and enderly mechanical fuel injection. base engine is 9.2 compression, blower 10% underdriven, running f&l sp-1 or sp-3 fuel, same as vp c12 c14. Ignition box is a 7-al3 not digital. My question is what should I run the NGK v-power #8 sparkplug gap at? I was told between .025 and .030..... is this close?? Reason I'm asking is, at the top end of the track I have what feels like a random misfire, engine has plenty of fuel -- went 20 #'s fatter on the pill, Have taken 8 degrees of timing out of it and still the same. Please point me in the right direction if you are familiar with this set up, THANKS!!!
#4
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Join Date: Nov 2007
Posts: 17
You can and have tried larger but I will say .018-.025.
Might check your pop off plate if you have coughed it previously.
Dave Koehler
http://www.koehlerinjection.com
Might check your pop off plate if you have coughed it previously.
Dave Koehler
http://www.koehlerinjection.com
#5
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Join Date: Mar 2003
Location: Fountain,MICHIGAN
Posts: 856
miss
You NEED to Ditch the MSD Box and get a GOOD Mallory Mag,Super Mag 3 0r 4 and you will be GOOD to go!!!
Just talked to a freind in Indiana this Week same Problem,He Tryed the MSD Route?Took it out and went with a S/M 5 and its GREAT Now!
Later
G 8)
Just talked to a freind in Indiana this Week same Problem,He Tryed the MSD Route?Took it out and went with a S/M 5 and its GREAT Now!
Later
G 8)
#8
Originally Posted by DaveKoehler
You can and have tried larger but I will say .018-.025.
Might check your pop off plate if you have coughed it previously.
Dave Koehler
http://www.koehlerinjection.com
Might check your pop off plate if you have coughed it previously.
Dave Koehler
http://www.koehlerinjection.com
#10
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Join Date: Jun 2003
Location: Hobbs, NM
Posts: 842
Originally Posted by jmarksdragster
Originally Posted by DaveKoehler
You can and have tried larger but I will say .018-.025.
Might check your pop off plate if you have coughed it previously.
Dave Koehler
http://www.koehlerinjection.com
Might check your pop off plate if you have coughed it previously.
Dave Koehler
http://www.koehlerinjection.com