Are UR6 plugs surface gap?

[JoeLutz]

????

 

[smeagol]

No. I assume you mean projected/non-projected. Here are the list of plugs that physically fit the syty head.

All are NGK, R type plugs. UR plugs are resistor, RXXXX may be race, non-resistored plugs, I forget offhand. The part numbers may or may not be up to date.

Projected plugs:
UR5 2771 5 heat range hotter
UR6 7773 6 heat range
R5764-6 4449 6 heat range
R5764-7 5034 7 heat range
R5764-8 5657 8 heat range
R5764-9 6468 9 heat range colder


non-projected
R5673-6 2405 hotter
R5673-7 2817
R5673-8 3249
R5673-9 3442
R5673-10 4050 colder

I am tempted to try a non projected plug for many reasons. That will be once I own a Syty again, and am pushing the boost level etc.

The iridium plugs are UR5IX and UR6IX, not sure of stock numbers.

 

[InvisiBill]

From http://invisibill.unimatrix01.org/sy/ngkplugs.txt if you need it later...
--------------
http://www.monarchproductsinc.com/ngk.htm
UR5 2771 $1.99
UR6 7773 $1.99
UR5IX 7177 $6.40
UR6IX 7348 $6.40

 

[JoeLutz]

Go here to see what I am talking about. http://www.edelbrock.com/automotive/sparkplugs.html
The first example is a surface gap plug. The surface gap should provide beter heat transfer from the electrode allowing the tip to run cooler to prevent preignition. It has been proven to work on Winston Cup cars where they had a lot of problems with burning holes in pistons. I want to try some of these in my Ty along with some Lead based antiseeze to reduce thermal contact resistanc between the plug body and head. Only catch is the surface gap plugs require a Strong ignition system to maintain a clean electrode.

 

[InvisiBill]

LIke BG said, they are like the "Regular Gap" pics on that page.

A surface gap plug provides exactly what its name describes... a gap at the surface of the combustion chamber. The gap is a .050" annular configuration. The center electrode and insulator tip operate extremely cold (no heat range rating) and are, therefore, nearly impervious to pre-ignition. However, fouling deposits are always present and cannot burn away. These types have limited use in racing. A special ignition system with very high energy and a very fast rise time (CD) is required to fire the gap when fouling deposits are present. The insulator tip does not operate hot enough to allow reading of the spark plug during engine tuning.

That sounds almost too cold. Sounds like it'd cause even more problems with our stupid ignition system...