Originally Posted By: bbhero
One thing is that the valves are not exposed to direct combustion process. Indirect yes. But not direct. Valves can get gunky from poor gasoline. That's why the whole top tier stuff started. The amounts of gunk on valves was greatly reduced by additives. Direct correlation there in all likelihood. Yes I'm well aware gas is a solvent in and of itself. Again, good bad or indifferent Chris's videos are not going to show the most benefit of using Techron or Gumout.
I'm not trying to give you a hard time here at all. Not trying to be a horse's rear end either. Just not buying Chris's videos as the end all and be all evaluation of these products.
True for intake valves, but exhaust valves are almost always clean because they're opening up to let out the exhaust. By design, the backside of the intake valves are slightly exposed to combustion products (which is why there's carbon) but not where it's hot enough to burn it off.
One thing is that the valves are not exposed to direct combustion process. Indirect yes. But not direct. Valves can get gunky from poor gasoline. That's why the whole top tier stuff started. The amounts of gunk on valves was greatly reduced by additives. Direct correlation there in all likelihood. Yes I'm well aware gas is a solvent in and of itself. Again, good bad or indifferent Chris's videos are not going to show the most benefit of using Techron or Gumout.
I'm not trying to give you a hard time here at all. Not trying to be a horse's rear end either. Just not buying Chris's videos as the end all and be all evaluation of these products.
True for intake valves, but exhaust valves are almost always clean because they're opening up to let out the exhaust. By design, the backside of the intake valves are slightly exposed to combustion products (which is why there's carbon) but not where it's hot enough to burn it off.