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Originally Posted by 14 apache
(Post 4383065)
That's what a 1075sc does and I think its a great idea less area for the piston to absorb heat.
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Originally Posted by mike tkach
(Post 4383145)
2 ways of looking at that,some say it,s more area to disipate heat.
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Originally Posted by 14 apache
(Post 4383152)
Also going to help lifting the ring land by the intake valve. Almost no valve notch.
Originally Posted by 14 apache
(Post 4383065)
That's what a 1075sc does and I think its a great idea less area for the piston to absorb heat.
Aftermarket flat top pistons have a good sized valve notch usually. |
Send the head to Diamond. They will make a piston with a dish that mirrors the combustion chamber. Tell them you want a 2degree slant towards the exhaust valve.
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1 Attachment(s)
Flat top in a 1075sci in the hole a bunch if anyone wants the CH I will measure it.
[ATTACH=CONFIG]548444[/ATTACH] |
Originally Posted by 14 apache
(Post 4383174)
Flat top in a 1075sci in the hole a bunch if anyone wants the CH I will measure it.
[ATTACH=CONFIG]548444[/ATTACH] |
Originally Posted by MILD THUNDER
(Post 4383181)
Looks like a flat top from here! Thats a small valve relief for sure, compared to most shelf JE, CP, etc
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i guess you don,t need a deep valve relief if the piston is far enough away from the valve.
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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. |
Mike @ high Flow likes Flat top pistons .. his explanation was something to the effect of
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. |
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