Spark Plug Problem

[jason packham]

Re: Spark Plug Problem

The d-16 plugs have the small tops that unscerw.Making new top connectors that are larger .The wires are slicks with clip ends.The aircraft is in the experimental cat 51% rule rebuild.

[Ragwing nut]

Re: Spark Plug Problem

The REM37BY plugs are approved for the small Continental engines.

News to me, I guess I will have to look at Champion's sheet again. Seems like too cold of a plug unless you are running 100LL only.

Mike

[Ragwing nut]

Re: Spark Plug Problem

Mike,
I'm running a short mount. How much do you want for the can?

Send me a PM with your address again and I will see if I can find a whole unit to send you. I have a bunch of bottoms, but tops can be hard to come by. How about dinner if you are ever in the area?

Mike

[crispy critter]

Re: Spark Plug Problem

I did some checking and it does not specifiy fuel type but is approved on the 0200 and pretty much any other 4 cylinder conts.

[Ragwing nut]

Re: Spark Plug Problem

I did some checking and it does not specifiy fuel type but is approved on the 0200 and pretty much any other 4 cylinder conts.

Good to know

Mike

[NY86]

Re: Spark Plug Problem

The REM37BY is not a cold plug, regardless of what the number may suggest. Viusually, if you note how far the electrode extends out of the base, you would surmise that it is, in fact, a hot plug. One of the design parameters was that it be resistant to lead fouling, which is more of an issue with cold plugs.

When it's all said and done, the plug is approved for all A and C series Continentals including the O200, except the A-100, is less prone to lead fouling, and happens to be 3/8" shorter on the connector end to boot.

[Ragwing nut]

Re: Spark Plug Problem

The REM37BY is not a cold plug, regardless of what the number may suggest. Viusually, if you note how far the electrode extends out of the base, you would surmise that it is, in fact, a hot plug. One of the design parameters was that it be resistant to lead fouling, which is more of an issue with cold plugs.

When it's all said and done, the plug is approved for all A and C series Continentals including the O200, except the A-100, is less prone to lead fouling, and happens to be 3/8" shorter on the connector end to boot.

It is less prone to lead fouling because they moved the electrode out from inside the barrel. It is still a lower temp plug that a 38 or 40.

Mike

[NY86]

Re: Spark Plug Problem

It is still a lower temp plug that a 38 or 40.

I don't know if we're talking about the same thing or not. What I'm saying is the REM37BY has the physical characteristics of a hot plug, i.e. center electrode extending deep into the combution chamber and a long heat dissipation path. In addition, it performs like a hot plug in that it is less prone to fouling. If it walks like a duck...

A cold plug has less center electrode in the combustion chamber and a short path from the center electrode to the threaded barrel. Less heat is absorbed by the electrode and that which is is more easily disipated to the head, thus the center electrode runs colder.

TMSAISTI!

[Ragwing nut]

Re: Spark Plug Problem

I don't know if we're talking about the same thing or not. What I'm saying is the REM37BY has the physical characteristics of a hot plug, i.e. center electrode extending deep into the combution chamber and a long heat dissipation path. In addition, it performs like a hot plug in that it is less prone to fouling. If it walks like a duck...

A cold plug has less center electrode in the combustion chamber and a short path from the center electrode to the threaded barrel. Less heat is absorbed by the electrode and that which is is more easily disipated to the head, thus the center electrode runs colder.

TMSAISTI!

We are just approaching the same answer from two different directions

Mike

[crispy critter]

Re: Spark Plug Problem

Tribe,
Whatever the answer might be,I installed the 37BY in the top of the #4 cylinder and it is almost a half inch shorter. I could have used these plugs without the bumps. They do clear the piston and it seems to run(ground run) just as it did before. No more clearence problems,now we will have to see if the plug will hold up like the others.
Thank you all for your help and info.

[SteveR]

Re: Spark Plug Problem

I've been doing a little reading about spark plugs, saw this thread, and thought I'd throw this information out there.

At OshKosh this weekend, I went to the AutoLite spark plug booth and asked their representatives about fine wire plugs. I was considering using them for their extended life, and the reduced likelyhood of fouling. He said I should use the much cheaper "projected gap" massive electrode (type BY). It is still a "massive electrode" type plug, but with a different electrode design.

He explained that the type BY massive electrode projected gap plugs were designed to prevent fouling in the O-235 equipped Cessna 152s, as these are VERY prone to fouling. That makes sense, the one O-235 equipped 152 I've flown fouled the plugs during taxiing the first time I flew it (obviously it should have been leaned). He also said that the projected gap plugs work very well in small Continentals (he was recommending these for my A-75).

[SteveR]

Re: Spark Plug Problem

The page below has links to pictures for comparison. It appears that they would protrude into the cylinder the same distance (count the threads). The primary length difference appears to be outside the cylinder.

http://www.chiefaircraft.com/airsec/Aircraft/IgnitionSystem/SparkPlugs.html#autolite