- Local time
- 1:55 AM
- Oct 14, 2016
- Ft Erie Ont
The plug not being seated with the crush ring WILL lose compression, and hotter plugs make the engines over all temps higher this is a fact and yes if the plug tip isn't in the chamber fully the flame front wont propagate into the chamber correctly thus leaving an incomplete burn to where you will never be able to read the plug and it runs like s**t!It’s about 1mm from being fully seated but the plug fits so tight at the moment it will not go any further. I would be inclined to think there’s not a big enough loss of compression to cause the problem I’m having because it’s so tight fitting, There are tapered plugs that seal by a similar tight fit vs the crush ring. It’s definitely worth addressing whether it’s the cause of the problem or not. I thought possible the spark plug is not in the optimal position to ignite the air/fuel mixture.
Looks like I’m on hold til the thread chaser comes from Amazon as far as that goes unfortunately my tap set only goes to 12mm.
May run a compression test on it just to see what it says.
As far as the plug heat range, oddly there’s still been some colder days/ more so nights here in Kern County Ca but it’s only going to get warmer. Though, to my knowledge, temperature of the weather has little affect on what heat range plug to use, but more air fuel/ratios, oil/fuel ratios, hi vs lo compression, naturally aspirated/ boosted in 4 strokes, self cleaning ability, among other things … otherwise we’d all be changing plugs two times a year right???
What heat range plug needed can vary from engine to engine depending on the factors I listed above and more so it’s hard to say if you need a colder or hotter plug until you run it long enough to read the plug. But in general a lower compression, relatively low performance/ stock engine generally run warmer plugs.