Piston selection is a crucial balancing act and definitely something to ponder but there’s loads of them out there
Yes spool is a cheaper option and yes they aren’t as quite as others so that’s the trade right there
cosworth is arguably the best piston money can buy for this engine platform and exclusively built for Brad at atomic
you get everything here ( quiet/massive HP capacity ) but cost is the offset
Manley have a decent piston with skirt coatings for a reasonable dollar and a pretty decent all round offering
Mahale have the FGF6 piston that’s a semi forged item, super cheap super quiet but imho rated to 25psi absolutely maximum on E85 probably 22psi on 98 as the ringlands ( on stock ring gap )and technology within the piston isn’t there for a mass production offering
Mahale also offer a range of other pistons to suit the falcon XR6T with very good manners and costs
any piston that’s a semi forged will be cold quieter than forged
full forged has bigger power capacity
cast pistons are the cheapest and quietest
now here’s where it gets funky..... the cast pistons in the FG Xr6t are (IMHO) better at bigger power than the FG F6 semi forged Mahale piston ( weird I know )
the ringlands on cast pistons have more “flex” than semi or full forged ( on stock ring gap )
getting a new set of FG pistons/rings but say a spool Rod will happily crank out 550rwkw with an appropriate ring gap to suit the target boost/fuel with factory PTB clearance
sooooo many ways to skin a cat
on a budget as above , got some coin and want to push it go Cosworth with a 0.50 over and hone and line boar the block to suit with a torque plate on to the stud pressure you’re going to run
basically how fast can your wallet go ?
yes get a new balancer as the Atomic street balancer is miles better than factory and sub $300
dont just get the gears, go a full pump assembly as there’s more than just gears in that puppy again full assembly is sub $1300
swop the yellaterra plate for the Atomic HD plate, one look any you’ll know where every cent went again sub $600
clean the FG head up ( cold tank ) and skim the deck 0.002 of an *
new exhaust valves for turbo are around $30ea from ford
Plazmaman springs are the new spec and really good ( all retainers/locks are generic across turbo/NA so don’t worry about new retainers ) just under $400 a set
I cannot stress enough to change the chain/tensioner/guides/lower sprocketand pivot guide at the same time as the factory stuff isn’t great at maintaining pressure against the tensioner under fast fluctuations obviously Atomic again
all of this stuff and a pump assembly and HD street balancer is $2460 inc gst and postage ( I had this exact package priced up this morning for another member )
I can supply all of the part above and make it much better than RRP if you want
I can even get all the valves/gaskets/seals and odds n sods for you if you need
shout out happy to help