PDA

View Full Version : V8 sparkplug gap?



63t-cab
05-27-2010, 11:39 AM
Are most setting plug gaps at .035 (63 engine) I think the book says .033-.038

j.byrd
05-27-2010, 12:10 PM
Mr. Z, I usually set toward the tighter tolerance simply because as the electrode burns away, you still are in tolerance and it takes longer to get too wide. At the same time, using Autolites, I have really never had a problem of any kind, just habit I suppose, but .35 should be good for a long time if all systems are normal, John

StudeRich
05-27-2010, 05:14 PM
And now-days, most of us are running Pertronix Electronic Ignition Systems, so the plug gap should be somewhat wider for those, than the Points type.

63t-cab
05-27-2010, 06:01 PM
Rich, what gap do you set for Pertronix ?

StudeRich
05-27-2010, 06:37 PM
There are no specs that I know of, I believe Ted Harbit said he uses .038-.040 but can't be sure because I can't find the Word Doc I thought I saved from the forum.

Someone else will verify this, or NOT, I am sure!

53k
05-27-2010, 07:26 PM
There are no specs that I know of, I believe Ted Harbit said he uses .038-.040 but can't be sure because I can't find the Word Doc I thought I saved from the forum.

Someone else will verify this, or NOT, I am sure!
When I bought a Pertronix from Ted he ultimately decided that .040 was best.

nibbs53
05-27-2010, 07:36 PM
http://www.pertronix.com/support/tips/default.aspx#a5

studerodder
05-27-2010, 09:52 PM
i have pertronix ignition and a 600 cfm afb on a '62 289 - running autolite #437 @ .040 gap - very happy with this set-up.

DEEPNHOCK
05-29-2010, 04:26 AM
OK, you electrical sleuth's..(and insomniac proof readers)
On the Pertronix website listed above/below....
In the OMC section, they list a fix to help with the shifting on an OMC outdrive...
http://www.pertronix.com/support/tips/pdf/diodefix.pdf (http://www.pertronix.com/support/tips/pdf/diodefix.pdf)
In the PDF pic they list 'two' diodes in series (see pic link)
Why two diodes?





http://www.pertronix.com/support/tips/default.aspx#a5

1960Hawk
10-29-2010, 07:11 PM
quick hijack of this thread ;)

I have a pertronix kit installed and plugs @ 40k on a 259 and was wondering if there also is a sweet spot to set timming.
I have read were it is a good idea to give it generous amount of advance but I think that was mainly for race /performance.
Is there a sweet spot or is evey setup going to be different and will it be more of a trial and error.
Or should I just leave it at original specs for timing???

PlainBrownR2
10-30-2010, 03:26 AM
OK, you electrical sleuth's..(and insomniac proof readers)
On the Pertronix website listed above/below....
In the OMC section, they list a fix to help with the shifting on an OMC outdrive...
http://www.pertronix.com/support/tips/pdf/diodefix.pdf (http://www.pertronix.com/support/tips/pdf/diodefix.pdf)
In the PDF pic they list 'two' diodes in series (see pic link)
Why two diodes?


I can probably take a stab at it. The peak voltage of one of the diodes is 400V 3A before the circuit starts passing electricity, which in this case is also connected to the Pertronix module. The principle is the same with resistors, where if you connect resistors in series, you can increase the resistance in the circuit, and by connecting the resistors in parallel you can increase the amperage in a circuit. In this case by wiring the diodes in series, you go from 400V 3A to being able to hold back 800V 3A. It's also a cheap way to get the specification of a component that you don't readily have in your drawer.