Thread: Spark Plugs-> Indexing
03-24-2007, 01:44 AM #1
Spark Plugs-> Indexing
Does our 4tec engines prefer the plugs indexed towards the intake or exhaust?
Also would our forced-induction engines benifit from side(j) gapping?
03-24-2007, 01:51 AM #2
I use to index my plugs on my 2 stroke Kawi's......not sure what the gain was but some boasted 50rpms?? Not sure if it helps for RXP/RXT
That girl in your sig kinda looks like Briana Banks....she prefers some else than a finger though
03-24-2007, 02:05 AM #3
- Join Date
- Dec 2005
- Austin, TX
I use to index the plugs on my 87 GN. On a mild 400hp setup the indexing netted 8 hp to the wheels. Motors are completely different, but since our powerplants produce 215 stock this may be something to look at.
We use to index the plugs toward the exhaust side.
03-24-2007, 02:13 AM #4
Originally Posted by sourpower RXT
03-24-2007, 05:21 AM #5
Now in the new millenium indexing is becoming less popular. In the 80`s it was 50/50 from engine builders on good/waste. I have indexed plugs at the track and netted nothing, zero.00. I`ll tell ya as well as MOST engine builders (on a pro level) that indexing is a waste of time. I will never waste anothe rsecond of my life doing it.
03-24-2007, 08:35 AM #6
03-24-2007, 08:52 AM #7
- Join Date
- Oct 2005
I`m on the fence on this one , based on the shape of the combustion chamber, unshrouding the flame kernel from the ground electrode may or may not have any gains...
I didn`t feel the need to index plugs on my past turbo cars and big block power plants...
like HOSS, my friend went thru the process of indexing plugs on a chevy small block, netted zero results...
this topic could get pretty technical, but IMHO I think that using the ND iridium plugs will suffice, less voltage required for spark, stronger consistent flame kernel, etc etc...PR...
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