4g64 with 4g63 head piston confusion!

[white7g]

Im building a 4g64 bottom end will have a 1g 4g63 cylinder head. Im really confused on piston choice, wiseco has part number k548m865ap which it says is 9.0:1 to 9.3:1 compression with a -17cc dome . That compression ratio varies on like 3 different sites for that part number. JE has part number JE-256468K which is advertised as 8.5:1 compression with a -24.0 to -24.09 cc dome, and manley part number is MAN-613000C-4 which is listed as 8.5:1 compression ratio with a -23.5 cc dome. Im just confused as to which one would be best for my build will have around 400-450 hp and is a daily driver would like to stay between 8.5:1-9.0:1 no higher on 93 pump gas. Will have eagle h beam rods as well. thank you!

 

[white7g]

Just got off the phone with wiseco lowest the do is 9.45:1 and that's a little higher then id want. So I would like to know only from personal expierence of people with manley and je pistons which ones are the better piston. thank you

 

[Archer Fabrications]

Mahle has a 9:1 thats what i use, the honda guys seem to use JE a lot, the extreme psi dragster (currently fastest 4g63) uses manley pistons and rods.

 

[bmxfelon420]

I have the 9.3:1 Wiseco and it runs great. You just have to watch your openloop thresholds so the car wont build boost in closed loop, and it's fine otherwise. On 93 just make sure you're not running too much timing or boost and it will be fine.

 

[darknezz7]

were using the k548m865ap

Its been good so far on pump gas, but haven't played with tuning and boost yet either.

You must be logged in to view this image or video.

It should be 9:1 with our setup

I have some good info in my profile, particularly under the "pre planning" link, if your already at what brand pistons to get though sounds like you got it all sorted out. good luck, its a fun build


- Stroke: 3.937" (100mm)
- Rod Length: 5.906" (150mm)
- Compression Height: 1.378" (35mm)
- Head cc's: 47
- Dome Dish: -17cc
- Gasket Thickness: .042" (1.1mm)
- Deck Clearance: .0" (0mm)
- Block Height: 9.251: (235mm)
- Compression Ratio: 9.0:1 - 9.3:1
- Pin Diameter: .866" (22mm)

 

[bigdnno98]

what turbo and how much boost will play a big role in CR choice also.

 

[white7g]

gunna be a small 16 right now 20ish psi and move up to either a 68hta or a red the following year above 20 psi.

 

[bigdnno98]

Those numbers will be fine on a 9:1 motor.