[Peaty]

Has anyone tried indexing the plugs in a Subaru? Is it worth it? Just wondering if it's been done or not.

 

[RS25.com]

What's that? I've never heard of it. Please explain....

 

[Peaty]

It's an old tuners trick (OK so I'm old)



http://www.fordmuscle.com/archives/2000/07/indexplugs/index.shtml

I'm not sure that with the new higher efficiency motors we would see any gains. Still every little bit helps

 

[subrew]

I have not tried it on my G-Stock Subie, but have experience doing it on my hot rod Yugo, and dozens of hot rod Ford/Saab V4 engines.

The Yugo has dual carbs, and I lived at 5,000+ ft elevations, but raced at sea level conditions. Indexing the plugs helped when the car was a bit too rich (too much fuel), so I didn't have to change jets too often.

It wasn't anything you can feel, just helps to ensure a more even burn.

Chris H.
www.subrew.com

 

[2Point5RS]

You probably won't even be able to see your sharpie marks on the plugs.. they're so deep you can barely see the plug itself.

 

[Peaty]

No but you could put a mark on the extension you use to tighten the plug

 

[Guest]

Is this also why people side-gap plugs?

I haven't really ever seen a write-up on it, but from what I have heard people with big old american trucks do/did this... cut the end of the ground electrode then gap the thing so the spark fires from the center to the side, rather than straight up. That would also give you more of a direct shot to the center of the combustion chamber.

Oddly enough they say it cuts the spark plug life drasticly.

 

[Guest]

Oh. I also wanted to ask a question...

If you put washers (like that article was speaking of) on the spark plug aren't you running the risk of screwing things up? I mean if the electrode isn't far enough down into the chamber it's not going to work very well.

 

[Opie]

I've done on other cars I've owned...never tried it on the Scooby....wasn't sure which orientation would be the most beneficial...I'm due for another plug change soon though!

 

[lacdaddy]

bump from dead. any body ever index their suby plugs or find out which way is the best orientation for the ground strap to aim?

 

[Grafton]

i indexed my plugs on my hcf build, I put the ground strap towards the head but i did this while the heads were off so it was pretty easy, i didn't use any washers

I figured every little bit helps

 

[01rs25]

Bansheeboy did this with his new 205 swap..

 

[Scrapy Doo]

So.... what way did these plugs end up facing?