True 200 spark plug gapping

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cody_spencer
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True 200 spark plug gapping

Post by cody_spencer » Fri Jun 13, 2014 8:40 pm

What is the gapping on true 200's spark plugs

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Re: True 200 spark plug gapping

Post by SkinnerBack » Sat Jun 14, 2014 9:17 am

Hey Cody I know a lot of people say gap the plugs the same as your timing.....

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cowboy
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Re: True 200 spark plug gapping

Post by cowboy » Sat Jun 14, 2014 9:18 am

You will get many differing opinions on this question.

I think the answer is not dependent upon if it is a true 200 or not, but more so what magneto's your engine is equipped with.
1200 series mags are generally understood to be a hotter mag than the 200 series. It therefore understood that 2000 series mags are able to ionize wider electrode gaps much more reliably that a 200 series mag.

I had Mr Libsersky told me once that in his opinion, the 1200 series are almost too hot for their own good, because they are tough to keep insulated from tracking across the distributor blocks. They just plain throw some serious fire compared to the 200 series. Especially hard to resist tracking blocks on the 4 cyl versions.

The limiting factor will be how much spark energy your particular mags will generate at idle, for a general purpose Airboat application (non-racing), or the way you happen to operate your engine most of the time.

Idle rpm is when the mag generates the least spark energy, as the mag's rotor is spinning the slowest.

So if the above is understood, you want to run the widest gap, that your mags are able to fire the chosen heat range of plug installed, while not consistently fouling out plugs.

It can also depend on how much idle speed operation you allow, or perhaps also how high you set your idle screw.

.018 is usually a good starting point in my opinion.

Wider gaps also force the insulating aspects of the mags to take on more stress, so folks who choose wider gaps, may experience more tracking blocks that those who choose to run narrower plug gaps. Crappy plug wires also can amplify the stress on the insulating aspect of the mags.
Once they start tracking to ground, rather than fire the gaps, they will want to keep sending the spark down the path of least resistance.

That my take on it anyways, for whatever it is worth to you.

Keep on Truckin' :thumbup:

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Re: True 200 spark plug gapping

Post by cowboy » Sat Jun 14, 2014 9:24 am

Interesting gap set at timing deal there Skinnerback...
First I ever heard that one.

I would follow that on a race motor I think.
It would probably work awesome for a motor you don't plan to let idle very much, and has an ignition system in top condition, or is running a battery ignition system.

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Re: True 200 spark plug gapping

Post by SkinnerBack » Sat Jun 14, 2014 12:36 pm

That's what iv always been told..... Iv heard other people say it on here. My boat runs great when the mags are right been having trouble with them, think I'm going to go electronic ignition

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Re: True 200 spark plug gapping

Post by cowboy » Sat Jun 14, 2014 1:05 pm

Yup,
Battery ignition has it's advantages, as it eliminates the low speed operational holdbacks of running a magneto system. Fire Wide Gaps at any rpm.

I believe some electronic systems offer adjustable timing, per rpm range. Performance wise that could offer allot of advantage as well.
It also offer increased complexity.

Magento's are very reliable though when taken care of properly, and will almost always get you back to the hill.

It's always a trade off of one thing for another.

I learned one thing the hard way chasing magneto troubles.
Do not hesitate to suspect bad plug wires.

They do not last forever.

I solved my magneto troubles on several occasions, by sticking new plug wires in the front of them.
Just thought I would mention it, as you said you have been having a little mag aggravation.

Keep onTruckin'

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glades cat
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Re: True 200 spark plug gapping

Post by glades cat » Sat Jun 14, 2014 2:55 pm

Also, the wider the plug gap, the higher the resistance=the higher the voltage the coil has to generate to jump the gap= higher coil load and temp.
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Re: True 200 spark plug gapping

Post by SkinnerBack » Sat Jun 14, 2014 6:05 pm

cowboy wrote:Yup,
Battery ignition has it's advantages, as it eliminates the low speed operational holdbacks of running a magneto system. Fire Wide Gaps at any rpm.

I believe some electronic systems offer adjustable timing, per rpm range. Performance wise that could offer allot of advantage as well.
It also offer increased complexity.

Magento's are very reliable though when taken care of properly, and will almost always get you back to the hill.

It's always a trade off of one thing for another.

I learned one thing the hard way chasing magneto troubles.
Do not hesitate to suspect bad plug wires.
Thank you for your advice, I'll give it look I just bought the boat not to long ago so still working some bugs out

They do not last forever.

I solved my magneto troubles on several occasions, by sticking new plug wires in the front of them.
Just thought I would mention it, as you said you have been having a little mag aggravation.

Keep onTruckin'

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Re: True 200 spark plug gapping

Post by GMAC 76 » Sat Jun 14, 2014 6:20 pm

.022-.024...automotive plugs with magneto ignition

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Re: True 200 spark plug gapping

Post by pgs2845 » Sat Jun 14, 2014 7:57 pm

This has been a differing of opinions for some time, it's kinda like a$$ holes, everybody has one. For 35 years I have gapped plugs for 200 series mags @ .035 and 2000 series @ .040. I always use Champion # 515 or D15-Y spark plugs . ( same plug just different part # 's @ different stores ) These are a racing plug and have an extended tip to put the spark into a better place for flame travel and ignition. These also work great in cylinders that need a long reach plug. They are also a very cold plug that I have proved time and time again will solve a lot of detonation problems, especially with high compression engines. They will also solve some oil fouling problems. If your mags won't jump a spark .035 you need 2 have them worked on. As for the 2000 series' they are so hot that you have to gap them wider or you will constantly be burning blocks. Just my 2 cents worth.

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Re: True 200 spark plug gapping

Post by GMAC 76 » Sat Jun 14, 2014 9:40 pm

what is a 2000 series mag.....worked on 20, 200 and 1200 but never heard of a 2000 but then again I always thought the D-15 champion plug was a 18mm tractor plug didn't know they were a race plug

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Re: True 200 spark plug gapping

Post by getitdone » Sat Jun 14, 2014 10:18 pm

GMAC 76 wrote:what is a 2000 series mag.....worked on 20, 200 and 1200 but never heard of a 2000 but then again I always thought the D-15 champion plug was a 18mm tractor plug didn't know they were a race plug
The D2000 and D3000 magneto is a single drive dual magneto used on Mooney aircraft and I believe some Cessna. Its been years since I worked on M20J Mooney.
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Re: True 200 spark plug gapping

Post by cowboy » Sun Jun 15, 2014 6:28 am

GMAC 76 wrote:what is a 2000 series mag.....worked on 20, 200 and 1200 but never heard of a 2000 but then again I always thought the D-15 champion plug was a 18mm tractor plug didn't know they were a race plug

I really meant to say 1200 series in my original post 76.
Not the 2000 series Siamese mags.

I went back and fixed it.

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Re: True 200 spark plug gapping

Post by GMAC 76 » Sun Jun 15, 2014 10:01 am

cowboy wrote:
GMAC 76 wrote:what is a 2000 series mag.....worked on 20, 200 and 1200 but never heard of a 2000 but then again I always thought the D-15 champion plug was a 18mm tractor plug didn't know they were a race plug

I really meant to say 1200 series in my original post 76.
Not the 2000 series Siamese mags.

I went back and fixed it.
gotcha cowboy, but that other fella mentioned 2000 also and that's when I thought hell I must be missing out on something here and needed to ask the question...thanks

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Re: True 200 spark plug gapping

Post by John Fenner » Sun Jun 15, 2014 10:40 am

.018/.020
I never finish anyth,,,.

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Re: True 200 spark plug gapping

Post by John Fenner » Sun Jun 15, 2014 10:40 am

.018/.020
I never finish anyth,,,.

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Re: True 200 spark plug gapping

Post by gyrocopter582 » Sun Jun 15, 2014 11:19 am

Thank you John.
New Champion massive electrode plugs are gapped at .018.
My Champion gap tool has .015/.018 on one end, .019/.022 on the other.
My experience has been that after 50 hours, the gap has eroded past .022.
The most common complaint is "hard starting", second is a poor mag check on run-up.
When a massive electrode plug is tested in a plug test machine, under 125psi pressure,
with a gap exceeding .022, the spark is intermittent, at best.
Electronic ignition is a whole different animal.
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Re: True 200 spark plug gapping

Post by SkinnerBack » Sun Jun 15, 2014 11:49 am

gyrocopter582 wrote:Thank you John.
New Champion massive electrode plugs are gapped at .018.
My Champion gap tool has .015/.018 on one end, .019/.022 on the other.
My experience has been that after 50 hours, the gap has eroded past .022.
The most common complaint is "hard starting", second is a poor mag check on run-up.
When a massive electrode plug is tested in a plug test machine, under 125psi pressure,
with a gap exceeding .022, the spark is intermittent, at best.
Electronic ignition is a whole different animal.
When you say electronic ignition is a whole diff animal, what exactly do you mean by that?

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Re: True 200 spark plug gapping

Post by GMAC 76 » Sun Jun 15, 2014 2:18 pm

this is the sparkplug I have been using for the last 6 yrs. in my 200 lyc. it is an autolite unision extended tip performance plug gapped at .019 fired by 1200 series bendix mags with 7mm wires....the extended tip really puts the spark out in the CC where I then get a good fuel burn and no fouling...plug has about 18 hrs on it since last cleaning and gapping
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Re: True 200 spark plug gapping

Post by gyrocopter582 » Sun Jun 15, 2014 2:49 pm

GMAC, I have seen those plugs used on O-235 exclusively, not sure why.
Skinner, what I meant by a "different animal", was that with electronic ignition,
a wider gap can be used due to higher spark output. A wider gap is arguably better for performance.
Most electronic ignition employs variable, adjustable timing, and offers big performance gains.
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glades cat
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Re: True 200 spark plug gapping

Post by glades cat » Sun Jun 15, 2014 5:37 pm

A good spark plug article:

http://vdlfuelsystems.com/?p=273
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Re: True 200 spark plug gapping

Post by Larry » Sun Jun 15, 2014 6:00 pm

I stick to 0.018" on top, 0.015" on bottom plugs with mags. I have tried larger gap's but it seems to create issues at idle speeds, startup and poor low rpm running

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Re: True 200 spark plug gapping

Post by Larry » Sun Jun 15, 2014 6:02 pm

I stick to 0.018" on top, 0.015" on bottom plugs with mags. I have tried larger gap's but it seems to create issues at idle speeds, startup and poor low rpm running

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