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Old 10-10-2017, 03:06 PM
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Default Spark plug gap vs Boost
Just curious what other people are:
Gapping their plugs at?
At how much boost?
What spark plug?
and which fuel?

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Originally Posted by PontiacMatt72 View Post
ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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Old 10-10-2017, 04:01 PM
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NGK R5724-9, stock # 7891. Gapped .020, 12# boost, methanol.

Jim

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Old 10-10-2017, 04:26 PM
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I guess I should have said ours

Gapping their plugs at? .014
At how much boost? 39lbs
What spark plug? 5671A-10
and which fuel? Q-16

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ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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Old 10-10-2017, 07:40 PM
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Originally Posted by twooldgoats View Post
NGK R5724-9, stock # 7891. Gapped .020, 12# boost, methanol.

Jim

Ditto except gapped at .034 and a very powerful ignition system.


GTO George

Last edited by GTOGEORGE; 10-10-2017 at 08:02 PM.
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Old 10-10-2017, 07:52 PM
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.025 at 27 psi .
.020 at 35 psi
Plug R5671A-8/4554
E85 fuel
6 al ignition box Want to upgrade to a 7 .
9.8 to 1

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Old 10-11-2017, 08:00 AM
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NGK -8 out of the box gap
E98 24psi
E85 18 psi
Old 6al and a Blue MSD coil

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Old 10-11-2017, 11:50 AM
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.025 gap motor will pop like crazy @ 35 psi . .020 work just fine.....

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Old 10-11-2017, 12:07 PM
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Quote:
Originally Posted by GTOGEORGE View Post
Ditto except gapped at .034 and a very powerful ignition system.


GTO George
.034 Seems huge. What are you running for ignition a mag?

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ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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Old 10-11-2017, 12:16 PM
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I guess with 12 psi .034 will stay lit ....

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Old 10-11-2017, 12:56 PM
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Quote:
Originally Posted by wreckmastr View Post
I guess I should have said ours

Gapping their plugs at? .014
At how much boost? 39lbs
What spark plug? 5671A-10
and which fuel? Q-16
What's your total timing with 39 psi?

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Old 10-11-2017, 01:00 PM
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.034 Seems huge. What are you running for ignition a mag?
Crane HI-7 but remember I'm not running a whole lot of boost.


GTO George

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Old 10-11-2017, 01:21 PM
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Quote:
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What's your total timing with 39 psi?
26 degrees

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Originally Posted by PontiacMatt72 View Post
ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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Old 10-11-2017, 01:26 PM
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26 degrees
Thats pretty impressive timing!


GTO George

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Old 10-11-2017, 01:45 PM
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Correction 27 Degrees I changed it at the last race.


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Originally Posted by PontiacMatt72 View Post
ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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Old 10-11-2017, 03:46 PM
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Correction 27 Degrees I changed it at the last race.
cool!



GTO George

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Old 10-11-2017, 04:50 PM
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Quote:
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Correction 27 Degrees I changed it at the last race.
Did it pick up with the 1 extra degree?

What's your static compression ratio ?

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Old 10-11-2017, 05:50 PM
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Quote:
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Did it pick up with the 1 extra degree?

What's your static compression ratio ?
Picked up .07 (plugs looked better also)
9.5 : 1

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ET/mph talks, bullchit walks.
6.98 @ 199mph
4.53 @ 164mph
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Old 10-11-2017, 07:01 PM
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Quote:
Originally Posted by wreckmastr View Post
I guess I should have said ours

Gapping their plugs at? .014
At how much boost? 39lbs
What spark plug? 5671A-10
and which fuel? Q-16
gap .015 to .020
how much boost 10-12 psi, motor is 10 to 1 compression
which spark plug 5671a-9
which fuel C-16
Timing 29 degrees, have a air to water intercooler also.

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Old 10-11-2017, 08:28 PM
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Quote:
Originally Posted by wreckmastr View Post
Picked up .07 (plugs looked better also)
9.5 : 1
Im happy to see that 12 A/F ratio is possible with 39 psi. That's 0.82 lambda for e85 . Im at 0.78 now . Ill have to trim it up some and see what happens .

Thanks for posting your log.

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Old 10-11-2017, 08:30 PM
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Quote:
Originally Posted by wreckmastr View Post
Picked up .07 (plugs looked better also)
9.5 : 1
What's your cranking psi ? Im right around your ratio , just curious if its close to mine..

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