So my buddy is "indexing" his plugs for his racecar. (if you have to ask, its a built 383 70' Chevelle)

How important is this for us boosted guys? Seems to make sence to me.... ??? Will we see any advantages?


Wondering.

 

Sure it may help, But I always wondered about the loss of Compression because the plugs are spaced out more then normal....

I wonder if the good out weighs the bad!

Eric

 

you will see a gain but it is so minimal most poeple wont go thru the trouble

 

Spacer 1. .010
Spacer 2. .021
Spacer 3. .032

I really don't know, as my car is far from being able to take advantage (if there is one ) of this type of thing.

Im sure that some of the ALL OUT HONDA RACECAR's are doing something like this?? (please, correct me if I'm wrong!!)

BTW, he runs 12:1 CR, on a 50/50 mix of 110 octain gas. (the other 50 is that nice 92 octain Oregon gets )

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrbsponge &raquo;</TD></TR><TR><TD CLASS="quote">you will see a gain but it is so minimal most poeple wont go thru the trouble</TD></TR></TABLE>

Trouble??? This took all but 5 minutes man!

 

anyone care to explain what that is?

 

From what I understand, it places all of the spark plug electrodes in the same direction (intake runner)

 

Up up and away.

Looking for more input from high WHP guys.

 

Just use these:

 

I believe that would be "defeating the purpose" lol.

Bump for the night crew.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rmcdaniels &raquo;</TD></TR><TR><TD CLASS="quote">Just use these:

</TD></TR></TABLE>

It seems to me that the multiple ground electrodes would shield the arc even more.

I usually buy a set of 8 plugs. Within 20 minutes I can generally index four of them perfectly without washers at all. Then I still have backups.

 

Thanks Jim.

My buddy (who owns the car) and I agree that this might be advantageous. Even for a boosted 4cyl.

Looking for some more info if anybody can offer.

 

rb question, but how in the hell do you aim the electrodes of the plugs at the intake mani? i could not do that for anything unless there is some secret trick idk....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CivicVX94 &raquo;</TD></TR><TR><TD CLASS="quote">rb question, but how in the hell do you aim the electrodes of the plugs at the intake mani? i could not do that for anything unless there is some secret trick idk....</TD></TR></TABLE>

lol you mark the plug with it out of the head man...

why would this guy mix 110 leaded with 92 unleaded??

 

I have watched my dad do this on his built up 327 Chevy. I don't know if it would matter as much in our boosted cars (by our boosted cars, I really mean your boosted cars, as I don't yet have a turbo).

 

I need an explanation on how to do it with pictures I dont get how.

 

The reason they index the plugs on a big block chevy (396 not 383 unless its a mopar) is to keep the ground strap away from the piston dome.There is no advantage to doing it on a Honda.
Glenn

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote">The reason they index the plugs on a big block chevy (396 not 383 unless its a mopar) is to keep the ground strap away from the piston dome.There is no advantage to doing it on a Honda.
Glenn</TD></TR></TABLE>

On pentroof combustion chambers you mean?

 

First off, the multiple strap plugs are nothing short of garbage. Plain and simple.

As for indexing your plugs, probably don't need to on something like a 383 but if you have the free time no big deal. Indexing usually only shows gains with a lot of boost or a lot of nitrous (or both). Ive seen guys pick up 15HP indexing plugs but this was on a 800HP na engine with 400 more worth of spray.

If you are worried about losing compression, you better not run colder heat range spark plugs, they also will drop your compression about the same ammount. That ammount being .000001

 

yeah really, sure indexing plugs is nice, and im sure it helps a little, but, like everyone has said, the gains will be so minimal that its not worth the time to do it.

that said, i think im gonna go do mine, just to contradict myself

 

Not that I have room to talk, I index the plugs on my 266whp SOHC dodge lol.

 

Thanks Phase...

Thats the input I was looking for!