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Author
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Topic: spark plug indexing question?
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JoeT
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Member # 298
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posted
 
 
ok, call me a ricer or whatever. But here I sit, with a couple boxes of autolite plugs, my GT-40 heads, and some questions:
when indexing plugs, do you *have* to use indexing washers? or can you re-insert the spark plug to a different location when you 'start' the plug so that it 'cinches down' in the right location every time?
I have heard index washers suck because they pull the plug "out" of the chamber ever so slightly.
By the way, do I point the 'open' side of the plug at the middle of the intake valve, or what?
Lastly, when you 'trim' the firing arm, do you bring it back to the center of the electrode, or what?
heh.
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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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Hungry Hippo
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Member # 537
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posted
i have always wondered about index washers too, wont they change the heat range of the plug?
Posts: 2959 | From: east bay | Registered: Nov 2001
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JoeT
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Member # 298
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posted
sounds cool Jim, thanks. That's what I've been trying to do myself actually. I've got a few pointed at the intake valve already. Should I swing it to the exhaust you think?
Posts: 6785 | From: San Jose | Registered: Jun 2001
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BUCK_FIFTY
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Member # 728
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posted
What is indexing, and what is the purpose of it? ![[Frown]](frown.gif)
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"Funny how cheap ass people have money to do it right the second time, haha!"
Posts: 789 | From: 510 | Registered: Jan 2002
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JoeT
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Member # 298
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posted
the ground strap of the spark plug (think conventional copper plugs) will hurt power somewhat if it is blocking the path to the combustion chamber. specifically, you want the 'open' face of the spark to have free access to the combustion chamber.
you guys buy underdrive pullies right? gears? exhaust? MSD coils and ignition boxes? bypass the PS pump? same idea. another HP or two, who's gonna know? ![[Big Grin]](biggrin.gif) stealth mod, lol. ![[patriot]](graemlins/patriot.gif)
Posts: 6785 | From: San Jose | Registered: Jun 2001
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yellow67stang
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Member # 903
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posted
Why bother! Its a waste of time.
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I like cars.
Posts: 371 | From: Ca. | Registered: Feb 2002
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FasterDamnit
Bad Attitude
Member # 442
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posted
quote:
Originally posted by shade-tree:
sounds cool Jim, thanks. That's what I've been trying to do myself actually. I've got a few pointed at the intake valve already. Should I swing it to the exhaust you think?
Well, according to some roundy round racers I know back in SC and SCCA guys out here, yes, pointed towards the e. valve to promote even flame front travel. Now- I bet chamber size and shape has a direct impact on the front movement. Some dyno time would be cool to find out...
And the only reason to do this is to find that last 1 or 3 HP. I keep meaning to do it, just haven't taken the time.
JL
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'92 LX T5
Looked stock, went 11's 11.90 at 115mph.
'65 Mustang 347
www.fordmuscle.com
Livin' in the Carolina Pines
Posts: 2971 | From: NorCal | Registered: Sep 2001
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93PONY
Mr. Valve Events
Member # 60
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posted
Point it to the middle of the exhaust valve. I did it years ago on a near stock motor....waste of time. I still have the washers laying around somewhere.....
They say you can get maybe 1-1.5% more power out of the motor.
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000
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JoeT
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Member # 298
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posted
ok, I'm dynoing my car this week.
I'm running short on time so I'll leave the spark plug indexing for last.
on my short list:
"typhoon" intake re-install (1-2 hours usually)
electric H20 pump re-install (who knows?)
custom belt routing for crank to alternator only (who knows?)
crank underdrive pully (15 mins. lol!)
given that the real world is like 2x to 3x my best estimates, It's gonna be close if I have my car set up right or not prior to my $50 A/F dyno session
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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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