On 1 side, they are all clean
![Image](http://users.tpg.com.au/ntome44/SG/SPARKPLUGS/SP-clean.jpg)
On the other side, 1 and 3 are slightly fouled.
![Image](http://users.tpg.com.au/ntome44/SG/SPARKPLUGS/SP-Dirty.jpg)
The fouling is only on the top 1/2 of the ceramic insulator.
I'm not getting any noticeable misses, I'm not using oil, not blowing any smoke.
Ideas???
Cheers.
Torana68 wrote:when the plugs are tight what does the dirty side face? inlet valve by chance?
NATorana68 wrote:what spec is the engine? turbo? N/A?
Stage 3 Camtech cam, the largest they can regrind a standard cam, so it's fairly mild.Torana68 wrote:Std cam?
Took the rocker cover off today to check if the valves had any sideways play but all was good. The seals were also fine, no visible tears. I'll remove the carbs and look.Torana68 wrote:ok then the best bet is to pop the manifold and look at the backs and stems of the two inlet valves, if they are somewhet dirtier than the other 2 your problem is valve , guide or stem seal.... doent look too bad yet though.
Torana68 wrote:carbs?![]()
Neither. The seals are a premium grade viton rubber.Torana68 wrote:you dont have to do much to damage stem seals, are they Mits or cheapies???
I use Scat Swivel foot tappets which help minimize those issues, but, the "Stage 3" Camtech cam has a 1.9mm lower lift than a standard cam.Torana68 wrote:higher lift cam can also cause issues with side loading of the valve/changes to valve geometry etc etc.....