Automotive vs Aviation Spark Plugs

[Yen]

What do you need to run auto plugs with magnetoes?
Will they run with any mag or only one brand?

[F1R]

Originally Posted by j-red

I?ve used the G3i method on two slick mags and run cheap auto lite 18mm plugs off of them. No adapters, excellent spark, and cheap to replace. Caveat: I?ve also run the CPI on the top both times which really does most of the heavy lifting.

CPI ? what does the acronym expand to in words ?

[F1R]

Originally Posted by F1Boss

You can change to MSD 8.5 wires and use auto plugs with BENDIX mags. I know this because I have done it. Finally, I can get the engine to idle at 500RPM with this setup - about 650 was the low limit previously. Mag drop at 1600RPM is 10rpm. Yes - that is TEN RPM. TCM IO-550-N.

Seriously - I thought my switches were broken when I 1st ran the engine.

EGTs and CHTs have not changed - that I can tell.

Get in touch with Tom at G3 Ignition - he has instructions to change to the MSD wires, and I think he has a method to modify Slick mags too. Generally, Bendix mags have a hotter spark...and are rebuild-able.

Get the high quality auto plug adapters from Ross.

After getting this all set up and running, I had a discussion with a well-known exhaust system builder - he's been doing that mod for 10 years (if I can recall what he said). He asked why had I not done this before? Uhhhh....

At any rate, if you want to go this route, I have 'a few' extra parts left over from my setup - doubtful I'll need them, so I can help you with your parts order if you choose this option.

Boss,

What plugs do you run at what gap? What CR (Comp. ratio) is your 550?

[F1Boss]

Originally Posted by F1R

Boss,

What plugs do you run at what gap? What CR (Comp. ratio) is your 550?

I run 'em at the stock gap from the factory. I measure it at over .022 with a wire gauge. I am running fresh Bendix mags, and those are a bit stronger than the Slicks. Probably ought to close 'em to ~.020 if you are running Slicks.

Compression: apparently TCM fibs a bit - I have heard that the 550 has 9:1 (from one of the original designers), or maybe a bit more...8.5:1 in the published paperwork tho.

[RV6_flyer]

Originally Posted by j-red

I?ve used the G3i method on two slick mags and run cheap auto lite 18mm plugs off of them. No adapters, excellent spark, and cheap to replace. Caveat: I?ve also run the CPI on the top both times which really does most of the heavy lifting.

Would be interested in learning what part number automotive plug you use without adapters.

[FasGlas]

I run two ElectroAir ignitions. Lower has aviation plugs and upper has auto plugs.

[j-red]

Originally Posted by F1R

CPI ? what does the acronym expand to in words ?

Coil Pack Ignition. It's made by Simple Digital Systems. I believe they're a sponsor on the site. Great programmable electronic ignition system. I believe the hotter spark from this system and the greater advance means that most of the time when the slick mag fires, the ignition process has already begun. I like the slick as a backup in case of battery failure though, and the engine will run fine on one.

Originally Posted by RV6_flyer

Would be interested in learning what part number automotive plug you use without adapters.

Get in touch with G3i for the instructions and parts to convert your slick harness to auto plugs. As for the particular plugs I use, they're Autolite 386's. i only use them with the mag. For the electronic, I use the adapters and NGK plug type Ross sent with the system.

[rleffler]

Originally Posted by j-red

Coil Pack Ignition. It's made by Simple Digital Systems. I believe they're a sponsor on the site. Great programmable electronic ignition system. I believe the hotter spark from this system and the greater advance means that most of the time when the slick mag fires, the ignition process has already begun. I like the slick as a backup in case of battery failure though, and the engine will run fine on one.



Get in touch with G3i for the instructions and parts to convert your slick harness to auto plugs. As for the particular plugs I use, they're Autolite 386's. i only use them with the mag. For the electronic, I use the adapters and NGK plug type Ross sent with the system.

I'm confused. Your previous post implied that you are running with both G3i and CPI. Or did you have G3i, then replaced with the SDS solution? My assumption is that these are competitive products and not complimentary.

[mike newall]

We have an RV7 with a Titan IO-360 running dual P-Mags and an MT 3 blade prop.

I have conversed with, discussed with, cussed, abused, agreed and hugged Brad Dement since the mid 2000's - he is a good man and produces exquisite ignitions.

We were the second dual P-Mag install in the UK and have had no issues whatsoever since install.

They went back for a firmware update once.

We re time them every annual because it takes moments.

The plugs cost $8 a piece from O'Reilly's - good people to deal with, especially on OBT in Orlando ;-)

Oh, and there is some old gadge in the Carolinas that does other stuff for P-Mags - diddles with the timing, tells you all sorts of stuff that is super cool and useful. Likes Dragons apparently

Move up to the 21st Century and enjoy easy and simple ignition.

M

ps Bill - You can buy me a beer at Sun n Fun

[Toobuilder]

Originally Posted by rleffler

I'm confused. Your previous post implied that you are running with both G3i and CPI. Or did you have G3i, then replaced with the SDS solution? My assumption is that these are competitive products and not complimentary.

He states that he runs the G3i "solution" on his Slick mag... And a CPI on the other. In other words, one mag, one CPI- all with auto plugs, just like the OP is considering.