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Discussion Starter · #1 ·


These plugs were actually new a couple hundred miles ago. I know I didn't stick in a new set of plugs and do a wide open run, but I did a full throttle blast and then idled for about 1/2 mile after that back to my house. The plugs have like no color or anything on the ground strap. Are these plugs really lean or about right? BTW, they are Champion RV17YC6 spark plugs with a cut back ground strap.

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1982 F100 - 357c w/ stuffed 4v's and Funnelweb. C-6 trans, Gear Vendors o.d. and 4.86 geared Detroit Locker 9" rear. http://www.supermotors.org/registry/vehicles/detail.php?id=6723

<font size=-1>[ This Message was edited by: f100cleveland on 5/16/06 12:02pm ]</font>

<font size=-1>[ This Message was edited by: f100cleveland on 5/17/06 5:06am ]</font>
 

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The correct way to read plugs is to do a full throttle run and immediatly shut it down and THEN check the plugs.
When you allow it to idle, you won't get an accurate plug reading.
Do it that way and post another picture.....one that is a little more clear.
 

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Discussion Starter · #3 ·
I know what you're saying about the full throttle run. But, if the idling messes it up, it would just add residue or deposits on the plug. I'm just asking for a rough guess at the moment to what the plugs look like. I might be wrong, but to me they seem lean, but I could be WAY off.
 

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To lean and looks like the black spots are piston problems in the making. If you don't get them to a light tan color soon, you might start melting pistons.
 

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Can't tell from that crappy picture. Heat range seems kind of high, too, that will cause a lean looking plug even when it is running ok or a little rich.

How does it run?

Greg
 

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Looks rich with some detonation, maybe too high a heat range. Picture is too fuzzy to tell much. Idle WILL mess up what little reading you can do with plugs. With most of the unleaded fuels and a decent ignition, plugs will not color anymore. You want color, run a tank of leaded race fuel through it.
 

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The speckled spots on the porcelain look like detonation is happening.
Is your timing too high?
Looks like that picture was taken with a camera phone.
 

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Discussion Starter · #8 ·
I couldn't get the picture any clearer. Just got this Canon Powershot A620 and haven't perfected the way to take extremely close pics yet. As for timing, I'm running 35 degrees total. I checked the plugs heat range today and found out that it is 1 heat range too hot. I put my AR-25s back in and I'll see how they look after awhile. I put a different picture up so maybe that one will help a little in figuring out what it looks like.
 

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They don't look like cleveland plugs. Still, the ring looks quite fuely, even though the porcelin looks while. May be a tad rich, but a better pic may help.
 

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I think the timing needs to be retarded two degrees on the full advance and set a little higher for initial timing. This will clean up the black on the plug at the base and move the burn line up on the electrode a bit.
 

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Discussion Starter · #11 ·
Xdclevo, the plugs are Cleveland plugs. They are Champion plugs that have a very projected tip. Even more projected than the Autolite AR's. I did pull these plugs out and put the Autolites in cuz these are a hotter heat range.

Cahorne, I have my timing locked out at 35 degrees so I'm not able to adjust the initial at all.

Thanks for the advice so far guys
 

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I cured flecks on my C with a step colder plug. I run 24s, normal is a 25.

O/T - the best way to get a "close up" with a digital that doesn't really have macro focus will be to set the camera on it's highest quality/pixel setting, take a focused picture as close as possible (to stay in focus), then crop or zoom down with a good paint program.
 

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I agree with Chris...alittle rich and alittle hot. Go one step colder and if it doesn't clean up the specs on the porcelyn, take alittle timing out.
To check the fuel, cut the steel threaded section off the plug with a hacksaw...so it leaves the porcelyn intact. There you will find the "fuel ring" (unless its burnt off), small ring of grey right at the base of the porcelyn...alittle lean, well defined ring ....good, wide ring extending up the porcelyn towards the tip....rich.
 

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As for the pic, just make sure there is plenty of light on the picture subject, then your shutter speed will be faster and cut down on the blur from movement. Put the plug in a holder of some kind.
 
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