Author Topic: things plug  (Read 371 times)

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Offline aclarke

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Re: things plug
« Reply #10 on: July 25, 2015, 07:06:34 pm »
562 was last used to drop a dead Eucalyptus  28" bar  stihl motomix fuel.  About 95f. 

Offline 1manband

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Re: things plug
« Reply #11 on: July 26, 2015, 08:39:32 am »
looks like a much better method to cut the plugs!  going to re-cut mine.  thanks for posting.

interesting that the 562 runs a 2 heat ranges hotter plug (#6 heat range) in comparison to the non-strato 590 echo's colder #8 heat range.

if i remember correctly, it is 70C (158F) temperature difference between ranges on NGK plugs.  316F difference in comb chamber temp.

yours still looks cold to me.  stock ignition timing?  maybe a difference in timing is playing between the motors?

jennings says a clean ring tip on the insulator is desirable. another source says the metal center  + electrode should be half clean/half colored.

...fuel ring does seem to fit well with the information in article below......

here's a link to a 45 year old jenning's writing that is one of my references:  http://www.strappe.com/plugs.html

there are some other references to plugs, will post them up, when i find them again.



 
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Offline 1manband

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Re: things plug
« Reply #12 on: July 26, 2015, 08:49:51 am »
another link, has some alky stuff as well:  http://www.wallaceracing.com/plug-reading-lm.html
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Offline aclarke

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Re: things plug
« Reply #13 on: July 26, 2015, 11:50:43 am »
The 562 looks like the mix is on the rich side for sure.  This saw has a tab more exhaust and intake timing vs. stock.
By the way the saw runs I'd say it's lean, but the plug seems to tell another story...

Offline 1manband

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Re: things plug
« Reply #14 on: July 26, 2015, 02:52:17 pm »
had a plug in a bike that looked very similar to yours.  thought it was the mix. so, fooled and fooled with the carb to correct it.  nope.  then timing.  nope.

turned out to be weak spark.  magnets in the magneto.

don't believe it is your issue, just illustrating how head scratching this stuff can be.

this link shows the effects of timing, a/f ratio, etc. has on required voltage and temperatures in the combustion chamber:  http://www.stealth316.com/2-sparkplugtech.htm

ngk heat range info here:  http://www.ngksparkplugs.com/techinfo/spark_plugs/overviewp2.asp?nav=31000&country=US

your 562 looks like it can feed the fuel.  could it be that the coil is not strong enough to light off the overly rich mix fed in by the port changes?  it looks very cold for a 300F+ hotter heat range plug.

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Offline aclarke

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Re: things plug
« Reply #15 on: July 26, 2015, 10:50:35 pm »
I'd like to see what a stock 562 with no tweaks looks like...I'll see if I can get a plug from a stock 562

Offline 1manband

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Re: things plug
« Reply #16 on: July 27, 2015, 07:17:17 pm »
re-cut the plug.

clearer/easier to measure the fuel ring
 
thinnest = 0.088 inch
widest = 0.140 inch
average = 0.114 inch

there are color differences that my camera cannot pick up.  very bright light is a must.
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Offline 1manband

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Re: things plug
« Reply #17 on: July 27, 2015, 07:19:30 pm »
I'd like to see what a stock 562 with no tweaks looks like...I'll see if I can get a plug from a stock 562

me too
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Offline 1manband

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Re: things plug
« Reply #18 on: August 29, 2015, 07:56:53 am »
been busy lately. want to continue along with the science experiment.

can any dealers here get hold of Autolite brand spark plugs?  PM me, have green paper.

the stock plug is an NGK BPM8Y.  seems NGK does not make a colder plug than this.

so am trying to go to a brand that does.

need 3 stock heat range Autolite 2976 or XST2976 (extended tip)

and 3 colder Autolite 2974 or XST2974 (extended tip).

-joe

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Offline 1manband

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Re: things plug
« Reply #19 on: September 27, 2015, 06:31:37 am »
chevy suburban 5.3 liter v8 fuel injected

average fuel ring width = 0.072"

approximately 20000 miles on this set of plugs.

....notice ash deposits on ground straps.

richest vs. leanest plug.

.....truck thermostat is partially stuck open.  very long warm-up.
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