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Old 08-26-2009
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Spark Plug Indexing

Saw this on Horsepower tv. Yeah yeah its the same show that says that E3 plugs and Fitch fuel catalyst work but this actually makes sense. You face the plug the right way so the spark is able to ignite the fuel/air at a more efficient point. You do this by sticking small washers like this:

on the plug so that the electrode doesn't block ignition. They are thin enough to where they wont space the plug out too far from inside the cylinder. Seems simple enough to do too. Anyone think it might be beneficial? Anyone ever do this before?
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Old 08-26-2009
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Sounds like BS to me. You have a small area FULL of an air/fuel mixture. No matter where the spark is, that mixture is gonna blow. Its not like all the A/F mix is on one side of the cylinder and if the spark is pointed away its not going to light as well.
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Old 08-26-2009
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Yeah it will all ignite but indexing the plugs places the ground strap out of the way so the direction of the flame. A little searching and I found this:

Spark Plug Indexing - Holdenpaedia
FORDMUSCLE.com web-magazine - How To Index Spark Plugs
http://www.bullittarchive.com/5005.htm

Apparently people have been doing this for quite some time. I might try this on my next plug change.
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Old 08-26-2009
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its a valid mod for guys trying to get every bit of HP they can from the engine. It has been done for years.
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Old 08-26-2009
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sounds cool but i still confused how those washers are doing it. how do you know they are the same? trial and error? seems like you would have to add a few to some and none to others?
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Old 08-26-2009
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Just trail and error. You are not supposed to stack washers so if you put the thinnest one and it still isn't indexed right then you can just torque them down a few times to crush them.
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Old 08-26-2009
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Quote:
Originally Posted by whippersnapper02 View Post
Apparently people have been doing this for quite some time. I might try this on my next plug change.
on what, the gay toyota your gonna buy?
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Old 08-26-2009
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on what, the gay toyota your gonna buy?
Nah. On the gay Ford I own now cuz it needs all the help it can get to run properly and probably on the better Toyota I will own later.
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Old 08-26-2009
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Indexing spark plugs is a true and proven hp trick. I was able to run more timing on a turbo car just by indexing the spark plugs. 2 degrees more.
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Old 08-26-2009
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yeah, my dad is an old hot rodder, and he told me about this. I guess it works, i didn't bother trying it on mine. But I understand the theory behind it.
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Old 08-26-2009
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sounds cool but i still confused how those washers are doing it. how do you know they are the same? trial and error? seems like you would have to add a few to some and none to others?

me too, but that episode made sense of it. You have to put a mark on the plug and unstall it. How many dgrees off is what determines which spacer you use. If you're just shy of the mark, back it off a retorque.

Its cheap, but will def take a little time.
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Old 08-26-2009
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In a stock engine you will NOT feel, see, or gain any performance improvements. Even on ultra high performance apps. the gain is very minimal. The dyno will show a gain of only 1 or 2 HP.
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Old 08-26-2009
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But if I get a smoother idle then its worth it to me. I'm going to try since its cheap.
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Old 08-26-2009
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1-2 isnt bad when youll only see about 6 with an intake lol
and washers are cheap.. intakes are a few hundred bucks
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Old 08-26-2009
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I agree with everyone. 1-2 HP tops, and its worth it for the price. You run out of cheap HP mods real quick.
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Old 08-26-2009
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it may only net you 1-2, but think of it this way:

1-2 here, 1-2 there...those small gains soon add up.

but you mustn't forget the "holy trinity" of horsepower:

"If it's good and cheap, it won't be fast.
If it's fast and cheap, it won't be good.
If it's good and fast, it won't be cheap."
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Old 08-26-2009
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Quote:
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me too, but that episode made sense of it. You have to put a mark on the plug and unstall it. How many dgrees off is what determines which spacer you use. If you're just shy of the mark, back it off a retorque.

Its cheap, but will def take a little time.
so i am curious how you mark this on say a DOHC engine where you can barely see the plug after its installed.

4.6L, 5.4s, etc...

I may be wrong here but...

the machining on the engine should start at the same point on every hole, the threads should start at the same spot on every spark plug, if you were to torque them down to the same foot pounds wouldnt it be close enough?
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Old 08-26-2009
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you rubberize them beard! haha
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Old 08-26-2009
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have NICK do it.
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Old 08-26-2009
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Quote:
Originally Posted by zabeard View Post
so i am curious how you mark this on say a DOHC engine where you can barely see the plug after its installed.

4.6L, 5.4s, etc...

I may be wrong here but...

the machining on the engine should start at the same point on every hole, the threads should start at the same spot on every spark plug, if you were to torque them down to the same foot pounds wouldnt it be close enough?
well, it SHOULD...but it doesn't always happen like that haha
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Old 08-26-2009
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I'll do it. Where do i get those copper washers? Are they just brake washers? How do I know the proper way to put the ground strap opening? On a 4.0L SOHC
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Old 08-26-2009
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Quote:
Originally Posted by zabeard View Post
I may be wrong here but...

the machining on the engine should start at the same point on every hole, the threads should start at the same spot on every spark plug, if you were to torque them down to the same foot pounds wouldnt it be close enough?

its possible. I've never done it. the goal is to have the electrode to the opposite side of the valve. If the electrode is between the valves and the spark, the air/fuel has to move around the electrode to get to the spark.

That probably leaves a good 30 degrees or so that would be in that range.

What i do know in general terms- if you install the plug and its 60 degrees shy, you remove the washer and install the next bigger one. That gets you in range of just shy so that a loosen/retighten will get you dead on.

Repeat on next cylinder.
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Old 08-26-2009
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Old 08-26-2009
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they have been doing this for years on many race engines. specifically high boost turbo dragsters or engines running a lot of nitros
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Old 08-26-2009
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Quote:
Originally Posted by zabeard View Post
so i am curious how you mark this on say a DOHC engine where you can barely see the plug after its installed.

4.6L, 5.4s, etc...


Why not just mark the socket/ extension? easy enough.
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