So the standard is BP5ES For the 4g32 but detonation when hot making me want to change them so what do you run? What size gap etc?
Thanks!
What plugs do you run?
What plugs do you run?
76' GD A57 rebuild Full Album - http://www.facebook.com/album.php?aid=1 ... 29ef74e1d8
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astronturbo77
- Sigma-Galant Police (Global Mod)
- Posts: 1356
- Joined: Thu Mar 26, 2009 8:09 pm
- Location: Hobart Tasmania
Re: What plugs do you run?
one heat range colder than stock. If your having detonation issues the spark plugs are the least of your worries.
BUILT NOT BROUGHT BY ALGIE.
Re: What plugs do you run?
I would be rechecking timing when the engine is hot. Sounds to me like the advance isn't working.astronturbo77 wrote: If your having detonation issues the spark plugs are the least of your worries.
Re: What plugs do you run?
Swapped out the 2 primary main 96.5 jets with 110's today and helped a million.
I just want to know what plugs people are running? is there any better quality ones we can use like iridium or anything?
I just want to know what plugs people are running? is there any better quality ones we can use like iridium or anything?
76' GD A57 rebuild Full Album - http://www.facebook.com/album.php?aid=1 ... 29ef74e1d8
Re: What plugs do you run?
In the hot motor with 48's I ran 2 deg colder.
Stock-ish motor now I am running stock
Stock-ish motor now I am running stock
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Superscan811
- Posts: 1689
- Joined: Sun Mar 22, 2009 4:12 pm
- Location: Sydney
Re: What plugs do you run?
FYI:
The reason to run hotter or colder plugs has a bit to do with detonation, but more to do with cleaning the ceramic section of the plug, near the electrode.
If the plug is too cool, the ceramic section of the plug will carbon up and "short out", causing misfiring.
If the plug is too hot, it can cause detonation due to the earth tip heating up too much, causing the air/fuel to ignite too early.
This is only true if your Air/fuel mixtures are correct (or at least close).
If you remove your sparkplug, after idling for 5 minutes, there should be no carbon buildup on the ceramic section near the electrode. If there is, either you are running your Idle too rich or your sparkplugs are too cold.
After running your engine under high load and high rpm, at least 10mm of the ceramic should be free of carbon, if it isn't, either the plug is too cold or you are running rich.
There is a whole lot more involved in this than just changing your sparkplugs.
If your ignition is too advanced, you will get detonation.
If your compression is too high and/or you are using a lower grade of fuel, it may cause detonation.
If you have been running too rich for a while then the piston and combustion chamber will most likely have excessive carbon buildup, which can cause hot spots and detonation.
Food for thought.
Cheers.
The reason to run hotter or colder plugs has a bit to do with detonation, but more to do with cleaning the ceramic section of the plug, near the electrode.
If the plug is too cool, the ceramic section of the plug will carbon up and "short out", causing misfiring.
If the plug is too hot, it can cause detonation due to the earth tip heating up too much, causing the air/fuel to ignite too early.
This is only true if your Air/fuel mixtures are correct (or at least close).
If you remove your sparkplug, after idling for 5 minutes, there should be no carbon buildup on the ceramic section near the electrode. If there is, either you are running your Idle too rich or your sparkplugs are too cold.
After running your engine under high load and high rpm, at least 10mm of the ceramic should be free of carbon, if it isn't, either the plug is too cold or you are running rich.
There is a whole lot more involved in this than just changing your sparkplugs.
If your ignition is too advanced, you will get detonation.
If your compression is too high and/or you are using a lower grade of fuel, it may cause detonation.
If you have been running too rich for a while then the piston and combustion chamber will most likely have excessive carbon buildup, which can cause hot spots and detonation.
Food for thought.
Cheers.