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New Driveline Performance 68mm piston


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you meen because on most domed head chambers the squish band doesnt truely follow the radius of the piston top ? you could machine a radius into the band to match the piston top if you wanted. out of convenience i think most shops just dont bother doing it. theres alot of debate which piston type is better. domed supposedly will be cooled better as the mixture follows the crown and thus less detontation but theres a lot of debate on this subject as many people have tested the bejeezuz out of flat tops and havent encountered any increase in deto. it may boil down to case by case basis as no two situations are likely to be the same. if i were to make a dome piston i probly wouldnt exceed 10* but thats just me. if you look at what happens in the first few nanoseconds as the piston uncovers the port window i think the flatop has a slight advantage but in the big picture i dont think theres a hell of alot of difference in either piston type

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  • 8 months later...

Has anybody else made the switch yet or have first hand knowledge on these Pistons . I had a proven set up tune pretty dead on , switched to these Pistons on a rebuild. Motor now does not have the same low end power it used to and plugs black when were cardboard brown .... Being the pistons are now open at bdc when were closed before I'm guessing I'm gonna have to Jett down my pilot size. Anyone with first hand experience or can shed some knowledge?

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any engien changes will need most likely a jetting change.   in that case they the pistons rediesign is deffinatley doing something.  if the motor is now lean and passed a leak test  the new design pistons are letting more mixture in the motor. 

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