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-   Engine Tech (https://www.racingjunk.com/forums/forumdisplay.php?f=9)
-   -   PLUG GAP (https://www.racingjunk.com/forums/showthread.php?t=28700)

JEFF69Z28 08-23-2010 10:05 AM
PLUG GAP
 
CURIOUS,IS A BIGGER GAP BETTER,WHY DO SOME RUN SMALL GAPS AND OTHERS LARGER GAPS?

cepx111 08-24-2010 08:37 PM
The wider the gap the more resistance and the harder the ignition has to work to fire the plug.

A smaller or narrower gap will actually have a fatter spark kernel than a plug gapped wider.


On high compression motors on gas I run between .028 .032

Cp

JEFF69Z28 08-26-2010 04:54 AM
Originally Posted by cepx111
The wider the gap the more resistance and the harder the ignition has to work to fire the plug.

A smaller or narrower gap will actually have a fatter spark kernel than a plug gapped wider.


On high compression motors on gas I run between .028 .032

Cp
I HAVE ABOUT 11.50 TO 11.75 IS 45 TO MUCH

chevyfireball 08-26-2010 06:23 AM
45? What is your motor? I run 20-25 on a 632 nitrous motor.

JEFF69Z28 08-26-2010 06:58 AM
Originally Posted by chevyfireball
45? What is your motor? I run 20-25 on a 632 nitrous motor.
.045,GAS MOTOR 406 SBC

zipper06 08-26-2010 09:22 AM
I run NGK 8's or 9's with gas or alcohol, if i'm running the V-gaps i set them at .022, gas or alcohol, if i'm running the ES version (flat tip) i set them at .025. All use MSD ignition. In my opinion .045 is way out of range. I know that the old HEI setups GM called for .040/.045, but with multi-spark-discharge aka MSD you'll get much better firing of fuel charge setting them at less than .030.

JMO

Zip.

cncmotorsports 08-26-2010 05:28 PM
We see .035 to .040 gap makes peak power on most small blocks. If your using a mag then lower to around .025

JEFF69Z28 08-27-2010 01:34 AM
HOW COME MSD CALL'S FOR .040-.050? USING A 6AL OR 6AL-2

JEFF69Z28 08-27-2010 03:10 AM
Originally Posted by zipper06
I run NGK 8's or 9's with gas or alcohol, if i'm running the V-gaps i set them at .022, gas or alcohol, if i'm running the ES version (flat tip) i set them at .025. All use MSD ignition. In my opinion .045 is way out of range. I know that the old HEI setups GM called for .040/.045, but with multi-spark-discharge aka MSD you'll get much better firing of fuel charge setting them at less than .030.
DO YOU THINK NGK 7'S ARE TO HOT?

JMO

Zip.

zipper06 08-27-2010 09:15 AM
I think the 7's are more of a street application on pump gas. i run NGK 8's in my 377" on alcohol, and we run ES8's with a pump gas 468 b/blk shooting 200 shot of nitrous. I run NGK 9's in my blown alcohol sm/blk. I think the 8's would be better for your engine.

JMO

Zip.


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