John M
Enthusiast
- Messages
- 87
- Location
- Yorkshire
I have just removed my spark plugs for the first time from my 1108cc GTL. They were tight all the way out. So tight in fact that I feared striping the threads in the cylinder head. On inspection it looked like they were too long in the thread and the end of the plugs had carboned up making them larger at the end. The ones I took out were not the reccommended Champion L92 YC but Bosch FR7DC +8.
Comparing the two I can see the Bosch plug thread length is 19mm compared with the Champion 12.7mm. I don't know how much clearance there is in the combustion chamber but feel lucky to get away with it.
The only advantage though is that I needed a 16mm hexagon socket instead of a 21mm for the Champion which gave a bit more room.
Now without thinking I ordered a new set of plugs and I ordered the Bosch instead of the champion so what to do? I reckon I will make some copper spacers to go between the spark plug washer and the spark plug body unless anyone out there can think of a reason not to?
Yes I know I can buy some more plugs of the correct size but it does seem a bit of a waste.
Ho hum. These thing are sent to try us.
As a P.S. does anyone use copper slip when instaling spark plugs?
Comparing the two I can see the Bosch plug thread length is 19mm compared with the Champion 12.7mm. I don't know how much clearance there is in the combustion chamber but feel lucky to get away with it.
The only advantage though is that I needed a 16mm hexagon socket instead of a 21mm for the Champion which gave a bit more room.
Now without thinking I ordered a new set of plugs and I ordered the Bosch instead of the champion so what to do? I reckon I will make some copper spacers to go between the spark plug washer and the spark plug body unless anyone out there can think of a reason not to?
Yes I know I can buy some more plugs of the correct size but it does seem a bit of a waste.
Ho hum. These thing are sent to try us.
As a P.S. does anyone use copper slip when instaling spark plugs?