Optimal spark plug gaps?

[350freak]

I have an 89 carby 4 speed I know it calls for .044 gapping on the plugs but I also know you can open that up a bit for better power and fuel economy. Whats the best gapping and might as well if you know what are the best gaps for the EFI's too. Thanks guys

[koRnhead]

I akway a gapped at .045 and called it a day.

[sketchman]

You'll also eat plugs faster gapping them wider, and it'll be theoretically harder on the coil. Plugs aren't that expensive, but I've had to do new ones every 10k before because of excessive wear. That was also a wasted spark engine, so the Festiva won't be that bad.

I've gone as far as .065 in other cars. Never tried it in a Festiva though. If I were doing .065 in a Festiva I'd try to find a way to run dual coils. Don't know if you can do that or if it's even of any benefit, but I'd try to do it anyway.

[WmWatt]

The closest my wire spark plug guage comes is .040 so I use that.

[drddan]

I have used .048. Not sure it made any difference. It ran good, but it did at .044 too

[Movin]

High altitude I tighten up the gap some. Prevents missfire.

[jayber]

very limited benefits if any playing with gap on a NA engine. A power adder engine needs tighter gaps to prevent the spark being blown out under boost/spray

[Movin]

Can't fix what isn't broke. Some of these salesman fishing videos..it looks so good I have to try the new bling bling lure. Spark plugs with split fire, multi electrodes, fire rings, sharp little edges, tiny points, fancy metals work the same way! NGK is still working for me. .040 or if turbo car or supercharged I like .028 . If it works good use it, if you get misfires change plugs or gap. It all makes good camp fire talk lol

[BLACKESTSHEEP]

hi, your web links to : ' 91 Festiva FSM PDF ' are no longer active..is there any way you can update them..? thanks !

[sketchman]

If you mean mine, it's working for me.

[drddan]

I just wanted to check ...Torrent link does not work for me, but the dropbox link does work

Torrent gives me ... This page can’t be displayed

[sketchman]

That's because it's not a page. You right-click it and copy the link location. Then paste into a torrent client. Or if you're setup to click to DL torrents from magnets it would work, but it's not a page by itself.

[drddan]

Just shows how dumb I can be on some things! lol

but I did just learn something! Thanks!

[Chobobulous]

Nevermind it's gone

[BLACKESTSHEEP]

sorry...thanks..yes, the dropbox link worked for me fine, i got the FSM..however, i have an 89 ford festiva, so i'll look around for that year's fsm as well..this one here looks very similar though, and will help me out thanks again :p:p