Spark plug size poll

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

stevehuckss396

Model Engineer
Project of the Month Winner
HMEM Supporting Member
Joined
Nov 19, 2008
Messages
4,930
Reaction score
1,679
Location
Sterling Heights, MI
Yeah i'm at it again. Trying to get an idea of what the popular size plugs are out there. So a couple quick questions if you have a minute to help.

What size plug/thread in 1/4 scale

What size plug/thread in 1/3 scale


I'm asking because in the case of an older 7/8 threaded plug a true 1/4 scale falls between a 1/4 and #10 and a true 1/3 scale falls between 1/4 and 5/16

1/4 scale 5.5mm
1/3 scale 7.4mm

Also interested to hear about other scales and configurations.
 
Back
Top