Pistons are done*UPDATE*

[Krandall]

+1... I think I'm ready for 14:1 

[Bert]

+1... I think I'm ready for 14:1 

I saw Quad Magazine had an article recently about racing fuels & additives...

What fuel/octane requirements does the 14:1 need?

[Krandall]

I would say at least 100

[socalrappy700]

+1... I think I'm ready for 14:1 

Maybe next time you'll listen to me.

[VelociRaptor]

+1... I think I'm ready for 14:1 

You and I talked about this when we was going over your engine, "I wanna run pump gas" :'(

[zebradog]

Hey Kenny....do you have a weight on the 11:1 piston?  Also, by increasing the compression to the true ratio, will it have any effect on running pump gas at 11:1?
Thanks

[Kenny]

Hey Kenny....do you have a weight on the 11:1 piston?  Also, by increasing the compression to the true ratio, will it have any effect on running pump gas at 11:1?
Thanks

Actually I don't have a weight. I will get that as soon as possible. I think the piston itself weighs 390 gr....It does have full underside lightening. The piston should behave the same with pump gas. While the CR is higher, the tighter quench makes it less octane sensitive.

[zebradog]

Hey Kenny....do you have a weight on the 11:1 piston?  Also, by increasing the compression to the true ratio, will it have any effect on running pump gas at 11:1?
Thanks

Actually I don't have a weight. I will get that as soon as possible. I think the piston itself weighs 390 gr....It does have full underside lightening. The piston should behave the same with pump gas. While the CR is higher, the tighter quench makes it less octane sensitive.

How does having a tighter quench make it less octane sensitive?  Not questioning your information, just curious how it works....

[Kenny]

A couple of ways. The tighter quench with less dome makes a more compact chamber. What I mean by that is that it is more localized even though it is roughly the same volume. The flame doesn't have to travel the entire distance of the bore and across a dome.......The flame will be pretty much centralized, which makes a more efficient and faster burn. The tighter quench also tends to increase mixture motion, which also tends to increase efficiency and burn rate. The longer the mixture is allowed to absorb heat from the chamber before being completely burned, the greater the chance of detonation. There is also the effect of the amount of surface area the mixture sees..... I'm guessing you wanted me to generalize, so I'll stop now  

[RaptorRandy]

A couple of ways. The tighter quench with less dome makes a more compact chamber. What I mean by that is that it is more localized even though it is roughly the same volume. The flame doesn't have to travel the entire distance of the bore and across a dome.......The flame will be pretty much centralized, which makes a more efficient and faster burn. The tighter quench also tends to increase mixture motion, which also tends to increase efficiency and burn rate. The longer the mixture is allowed to absorb heat from the chamber before being completely burned, the greater the chance of detonation. There is also the effect of the amount of surface area the mixture sees..... I'm guessing you wanted me to generalize, so I'll stop now  

Good stuff     Better flame propagation is what it's all about 

[Kenny]

A couple of ways. The tighter quench with less dome makes a more compact chamber. What I mean by that is that it is more localized even though it is roughly the same volume. The flame doesn't have to travel the entire distance of the bore and across a dome.......The flame will be pretty much centralized, which makes a more efficient and faster burn. The tighter quench also tends to increase mixture motion, which also tends to increase efficiency and burn rate. The longer the mixture is allowed to absorb heat from the chamber before being completely burned, the greater the chance of detonation. There is also the effect of the amount of surface area the mixture sees..... I'm guessing you wanted me to generalize, so I'll stop now  

Good stuff     Better flame propagation is what it's all about 

I was hoping that explanation was digestible. Sometimes hillbilly doesn't translate well....

[J-HILT]

A couple of ways. The tighter quench with less dome makes a more compact chamber. What I mean by that is that it is more localized even though it is roughly the same volume. The flame doesn't have to travel the entire distance of the bore and across a dome.......The flame will be pretty much centralized, which makes a more efficient and faster burn. The tighter quench also tends to increase mixture motion, which also tends to increase efficiency and burn rate. The longer the mixture is allowed to absorb heat from the chamber before being completely burned, the greater the chance of detonation. There is also the effect of the amount of surface area the mixture sees..... I'm guessing you wanted me to generalize, so I'll stop now  

Good stuff     Better flame propagation is what it's all about 

I was hoping that explanation was digestible. Sometimes hillbilly doesn't translate well....

[NaturalRaptor]

A couple of ways. The tighter quench with less dome makes a more compact chamber. What I mean by that is that it is more localized even though it is roughly the same volume. The flame doesn't have to travel the entire distance of the bore and across a dome.......The flame will be pretty much centralized, which makes a more efficient and faster burn. The tighter quench also tends to increase mixture motion, which also tends to increase efficiency and burn rate. The longer the mixture is allowed to absorb heat from the chamber before being completely burned, the greater the chance of detonation. There is also the effect of the amount of surface area the mixture sees..... I'm guessing you wanted me to generalize, so I'll stop now  

Good stuff     Better flame propagation is what it's all about 

I was hoping that explanation was digestible. Sometimes hillbilly doesn't translate well....

Well said! 

I understand hillbilly and redneck. Its Charley Brown's school teachers that get by me! 

[zebradog]

Thanks Kenny, I prefer the long un-necessarily lengthy answers, they make more sense as to what is happening.

[Kenny]

I need to move these quick so I can put money somewhere else.
I have these left:
3) 11:1 102 bore
4) 11:1 105 bore
1) 14:1 102 bore
1) 14:1 105 bore

As far as I know these are the only corrected deck height pistons on the market.
They feature;
fully lightened under dome machining
superior 2618 material instead of 4032
Total Seal gapless rings
extra deep valve pockets to clear all cams including my  soon to be released high lift cam. I will let these go for $200 ea which are gonna normally retail for about $270