Piston pic.
Platinum Member
12-07-2015, 10:00 PM
#39
Update from High Flow Heads.
1. Some of my valve stems are worn, most likely from contaminated oil (blowby) , some of them you can feel the edge with finger nail.
2. Good thing for aftermarket Iron heads, Aluminum would have been damaged from the amount of heat I had .
3. 1 Super alloy Ferrea valve is cracked and tuliped (cylinder with busted plug)
4. Need 11 exhaust valves and 8 intake.
5. (4) exhaust valves had to be tapped out.
6. Springs pressures same as new. (spring oilers helped?)
7. Valve train otherwise very stable with no other damage.
8. Top of valve contact path great @ .050 ( Thanx Joe)
All in all pretty lucky not to have more damage from a stuck valve.
1. Some of my valve stems are worn, most likely from contaminated oil (blowby) , some of them you can feel the edge with finger nail.
2. Good thing for aftermarket Iron heads, Aluminum would have been damaged from the amount of heat I had .
3. 1 Super alloy Ferrea valve is cracked and tuliped (cylinder with busted plug)
4. Need 11 exhaust valves and 8 intake.
5. (4) exhaust valves had to be tapped out.
6. Springs pressures same as new. (spring oilers helped?)
7. Valve train otherwise very stable with no other damage.
8. Top of valve contact path great @ .050 ( Thanx Joe)
All in all pretty lucky not to have more damage from a stuck valve.
Last edited by ICDEDPPL; 12-07-2015 at 10:05 PM.
12-07-2015, 10:11 PM
#40
Mike @ high Flow likes Flat top pistons .. his explanation was something to the effect of
I can`t swing new pistons so I`ll stick with what I have as along as they are still ok.
I think it's more of a question of resistance to detonation anything. The flat-top gives you much more flat area quickly approaching the flat area of the head, causing much more of a "squish" effect that causes major turbulence in the combustion chamber, making a faster burn that's less likely to detonate. The dog-dished piston is first and foremost a smog device, designed for more complete combustion, and everything else be damned.
Additionally - the head is the best equipped to remove heat from the chamber. When you flatten out the chamber (reduce chamber size) and dish the piston - you remove heat transfer area from the head, and you increase heat transfer area to the piston.
Additionally - the head is the best equipped to remove heat from the chamber. When you flatten out the chamber (reduce chamber size) and dish the piston - you remove heat transfer area from the head, and you increase heat transfer area to the piston.
Last edited by ICDEDPPL; 12-07-2015 at 10:16 PM.
