Somebody had an informative post on the plug dynamics they published.... am i'm thinking Marty D, or Callahan...... it was a link that read into catylyst on the element etc,and basically glow plug, and what actually goes on in there, that would spin your mind....... somebody find it....
J dub has the factor thing exactly right.... for, its all the factors coming toghther that produce expected/unexpected results...... whats going on in the world, with those of us less motor ingrained, myself included..... is, a novice guy, like me, gets him, the newest bestest marine engine out there.... i'm gonna throw the highest nitro at it i can get in it.... so i get the speed, i need, and burn plugs like theyre candy. so, i'll search a tougher one.... well, OK. i'm eating dozens a year..... maybe eat a motor or two, in the process..... not necessarily the state i'm in,by far, but, i see it...... alot.
Gordon Jenning's book, ' Two stroke engine tuner" will and has enlightened me to some extent, and i'd recommend it to guys wondering about the combination of factors building up to the micro sized explosions we all seek....
Basically applying motorcycle 2 stroke engine THEORY to micro engine THEORY and the parameters are much the same.......
Current state of motor knowledge lacks to the point we rely on serious guys,( if you afford it at times)... Orlic, Wood, Wyss, Geraghty, Davis, Ackerman, and beyond. I've had good luck with Stanton racing engines and his theory...... everyone is running sombodies THEORY on that particular displacement engine, and through the sweat, and parts box carnage they have all incurred, we, sort of get to reap the benefits..... my hats off..... for sure......
Glow plug post, and here it goes..... Motor's eating plugs......( stock, new, tight, and, hopefully a clearance set).... tommy toenails, and me run to the shim box, ( least I do).... I might, throw a 2 thousandth in and see..... changing the compression ratio too..... of which, i dont know where its at, of course..... but, surely if the center's gone and black hole something is wrong, right?...... rarely, for me, but i see it all the time..... Had a guy, just yesterday, brings his 7.5 outboards down to test, ask of help, man goes through any plug instantly..... on 30%...... rebuilt himself...... clearance on both was, 9 and 10, respectively....... ummm like i kinda was around 17,and been down to 14.... my best thought....... motors ran and kept the plug what little time he spent with us........ i got lucky..... that was my theory...... he sure was happier, and while i was nervous, for the caliper he had was junk, it worked, and I used what i had available. ( shims).... Custom buttons, volume and squish, angles and what, are in my knowledge a little, for most they are not..... help us... and please dont look down because we dont catch on quickly enough..... 4000 guys on here want to learn........ i do.
Here's the best advice, i'll ever have, and it's READ that plug..... it will tell the story....... the plug link, if somebody will step up the plate..... will show you....... shiny:rich, frosted and grey, good, maybe even pulled out a little with a good scavenging pipe..... smashed, burnt, gone, lean,.... maybe i erred pushing that boat, once..... again, and i'm searching clearance, maybe a smaller prop, and other factors........ Every boat is different, because men are men... throwing out their theories...... search different heat range plugs, and try them, for your motor/fuel, pipe/prop boat..... it'll happen. there is no standard........ thats what i see.......
Theory:.... turbo plugs rock..... yes they do..... well, years have gained me, that the coldest 8's nova makes do not like my platform...... i dont use but have, ultra high nitro mixes.....and the 8's worked well.... reliable start, idle and no effect, ding, burnt whatever...... good run...... switching to 7's and ultimately 6's proved the difference, hands down...... just my particular combination in a 21 hydro, over time, and i found it..... maybe, 3 plugs a year if i get stupid...... turbo guys, try it...... I still read them as i do any other plug......and sure i spent a little money in plugs learning, but the end result with a consistent running engine was worth it........ knowledge, on the fact it takes extra voltage to heat them up, is a factor involved..... Novarossi if I'm not mistaken came out with a new ultra plug, i'm anxious to test..... they have coated the element with whatever and it's setting the car world on fire....... Sticker shock got me, but i'm gonna try a few........ like get a job......
Show your results..... please. If, the Odonnell's hang tough and they work for a given theory, lets hear it..... I'm on Mccoy's currently, and while on the edge, of taking a plug for performance, any manufacture comes up with a better theory on how to tame a miniature explosion 400 times a second, serious pressures and heat, and still be good, I'll buy one....... till then, keep testing.
J dub.... thanks for posting, maybe stimulate interest.... teach us...... and yes... i did stay at the Holiday Inn last night..... mike
