Forged Evo 8 stroker pistons. Made by Wiseco, part #K596M85
- Compression Height: 1.130 (28.7mm)
- piston CC: -21cc
- Pin Diameter: .866" (22mm)(same as f22)
I know lots of you guys are broke asses and would love to boost. The idea originated from ashb82 on H-T and I've decided to go a little further. But so far, this is what he's discovered.
The stroker pistons are a bit cheaper than any f22 piston on the market and are also 85mm bore. BUT, there's an issue because the compression height.
Using the stroker piston on an F22 rod will cause the compression to drop way too much. The solution? A longer rod? But doesn't custom rods cost money? Yep, it sure does. But wait...what about an H22 rod?
Using an H22 rod with the stroker pistons brings the compression back up to around 8:1 .It's still lower than stock, but tolerable and still perfect for boost! Now not only do you have a cheaper option with lower compression, but you also have the ability to rev higher even safer. The h22 rods are longer, which means the angles that the cranks force exerts onto the pistons aren't as severe as with the stock rods. AKA, a better rod/stroke ratio.
H22 eagle rods- $250-$350 depends on where you purchase
stroker pistons- $430 ish
compared to
F22 rods- $340+
F22 pistons- $460+
It's not A LOT of money saved, but something is something. Those extra $100 could go to other parts of the build.
They come 85mm std size, but you can also get them in 86mm if you wish. Which brings me to my next point.
For anyone wanting to build an F23, especially for boost, you can use those pistons as well.
They have a 1.130" compressoin height, compared to an F23 that has 1.181". Using the stroker pistons would yield ~7.8:1 compression, depending on a few other factors. You could easily bump it up slightly by milling the head.
Rods are another issue. You can either run the stock rods(which are floating pin already), or get some custom made. From what I've researched, stock rods can handle plenty of power as long as you use arp hardware with them and keep the revs down.
Anyways, just thought I'd share.
- Compression Height: 1.130 (28.7mm)
- piston CC: -21cc
- Pin Diameter: .866" (22mm)(same as f22)
I know lots of you guys are broke asses and would love to boost. The idea originated from ashb82 on H-T and I've decided to go a little further. But so far, this is what he's discovered.
The stroker pistons are a bit cheaper than any f22 piston on the market and are also 85mm bore. BUT, there's an issue because the compression height.
Using the stroker piston on an F22 rod will cause the compression to drop way too much. The solution? A longer rod? But doesn't custom rods cost money? Yep, it sure does. But wait...what about an H22 rod?
Using an H22 rod with the stroker pistons brings the compression back up to around 8:1 .It's still lower than stock, but tolerable and still perfect for boost! Now not only do you have a cheaper option with lower compression, but you also have the ability to rev higher even safer. The h22 rods are longer, which means the angles that the cranks force exerts onto the pistons aren't as severe as with the stock rods. AKA, a better rod/stroke ratio.
H22 eagle rods- $250-$350 depends on where you purchase
stroker pistons- $430 ish
compared to
F22 rods- $340+
F22 pistons- $460+
It's not A LOT of money saved, but something is something. Those extra $100 could go to other parts of the build.
They come 85mm std size, but you can also get them in 86mm if you wish. Which brings me to my next point.
For anyone wanting to build an F23, especially for boost, you can use those pistons as well.
They have a 1.130" compressoin height, compared to an F23 that has 1.181". Using the stroker pistons would yield ~7.8:1 compression, depending on a few other factors. You could easily bump it up slightly by milling the head.
Rods are another issue. You can either run the stock rods(which are floating pin already), or get some custom made. From what I've researched, stock rods can handle plenty of power as long as you use arp hardware with them and keep the revs down.
Anyways, just thought I'd share.
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