All the piston info you could want

[tstkl]

Hopefully we can get this to become a sticky, but I figured I'd post the information I collected while researching 7 bolt dsm piston options. There is more research to be done and I'll edit this post in the future (aka computer class), but I've already found a lot. It is worth mentioning I have collected no stroker piston data. The information on extremepsi's website is about 90% wrong fyi. the order of stuff listed corrisponds to the order of the numbers. Please keep posts in this thread limited so its purely numbers and no opinions on quality or anything. I just wanted people to notice some companies choose to run stock sized 34.7mm compression heights while others simpy run 35mm, among other data such as weight. All data for this database is from the manufacturers website, personal experience can be posted but won't be added to this post.

Mahle Pistons

MAHLE Motorsport
888-255-1942
Fax: 828-650-0819

Bore Stroke Rod Comp Height Pin Diam. Crown Vol Wght G. Compression Ratio Alloy Clearance Guide Assembly
*Meas. Min Max Part Number
85.00mm 88.0mm 150mm 34.7mm 22mm -10cc 309g 9.0 4032 0.31 0.0016 0.0024 EVO367346I10
85.50mm 88.0mm 150mm 34.7mm 22mm -10cc 314g 9.0 4032 0.31 0.0016 0.0024 EVO367366I10
86.00mm 88.0mm 150mm 34.7mm 22mm -10cc 318g 9.0 4032 0.31 0.0016 0.0024 EVO367385I10

"Meas." = The location to measure piston-to-wall clearance, referenced from the bottom of the piston skirt.
"Min" and "Max" is the suggested range of clearance over the coating for each application.

1.2, 1.2, 2.8mm Performance Ring Set Included

power pack plus

85.50mm 88.0mm 150mm 34.7mm 22mm -10cc 314 9.0 2618 0.31 0.0025 0.0033 EVO367366P10
86.00mm 88.0mm 150mm 34.7mm 22mm -10cc 318 9.0 0.31 EVO367385P10

http://www.us.mahle.com/C1256F7900537A47/vwContentByKey/W26HSFB8505STULEN/$FILE/2010%20AP%20complete.pdf
page 13, 16, 19



Weisco Pistons

Kit Part # Bore MM / Inch Over Sizes Stroke Rod Lgth. Comp. Ht. Head cc's Dome Dish Gasket Thkness Deck Clearnce Block Ht. Comp. Ratio Pin Dia. Ring # Gram Foot Notes
K597M855 85.50 / 3.366 .020 88 150 35 47 -10 1.1 0 229 22mm 8550XX 345 1

1. Most Wiseco pistons have offset pins. Pins must be offset same as o.e. for quietest operation (pin offset will be opposite of direction of engine rotation).

Pistons listed with a compression ratio range: low number is with un-cut deck, high number is block decked to .030 piston to cylinder head clearance.
• Always check piston to valve clearance - If using VTEC or like mechanisms-check w/ longer duration higher lift lobe.
• Always run at least .030 piston to head clearance including gasket thickness.
• If piston appears to be different than expected, please do not hesitate to call Wiseco at 800-321-1364 to verify compatibility.



Ross Pistons

engine code bore stroke rod length head cc c.h. comp ratio dome volume RING GROOVES gram wt. part no.
4G63 Gen1 3.376 (85.75 mm) 3.465 5.906 47.0 1.375 8.3 -12.5 1.0, 1.2, 2.8 mm 352 99810
4G63 Gen1 3.366 (85.5 mm) 3.465 5.906 47.0 1.375 8.3 -12.1 1.0, 1.2, 2.8 mm 350 99811*
4G63 Gen2 3.366 (85.5 mm) 3.465 5.906 47.0 1.375 8.3 -12.1 1.0, 1.2, 2.8 mm 343 99815*
4G63 Gen2 3.376 (85.75 mm) 3.465 5.906 47.0 1.375 8.3 -12.5 1.0, 1.2, 2.8 mm 345 99816*
EVO STD 3.346 (85 mm) 3.465 5.906 47.0 1.375 8.8 -10.5 1.0, 1.2, 2.8 mm 329 99873

* Includes Oil Ring Support Rails.



CP pistons

MAKE PART # ENGINE CODE BORE SIZE CH CR NOTES
Mitsubishi SC7201 4G63 2nd Gen 3.366 (85.5mm) +0.5mm 1.370 9.0 1,2

1 - Turbo or Supercharger
2 - Nitrous

MITSUBISHI® PISTONS
CP Mitsubishi® pistons are available standard or oversized. CP pistons are compatible with oversize valves
and higher lift cams and high performance rings. CP pistons represent the highest quality and are engineered
for maximum power. Pistons can be ordered with skirt coating if desired. Head gaskets also available.
STANDARD FEATURES INCLUDE:
-Deep valve relief depth accommodates high lift camshaft
-Made for +1mm valve sizes
-Custom skirt cam and barrel design
-Accumulator grooves
-High strength aluminum forgings
-High performance rings
-Fully CNC machined and balanced to +/- 1 gram
-Wrist pins and fitting included at no additional cost
-Double pin oilers, force fed oil ring
-Pick lock grooves for easy lock removal



JE pistons

Part # Bore Oversize Stroke Rod C/D(mm) Head CC's C/R With .040 Dome CC's Gram Footnote Skirt Included Ring Set#
208477 85.5 0.50 88 150 1.37 47.0 8.5:1 -13.2 316 T R JG2704-3366
289312 85.5 0.50 88 150 1.367 47.0 10.0:1 -2.1 335 T R JG1004-3366

T Accepts Turbo and Nitrous






deck height 229mm 9.01574803
bore 85.5mm 3.36614173
stroke 88mm 3.46456693
rod length 150mm 5.90551181
chamber volume 47cc or 43cc for 1.6 liter heads
gasket thickness 0.042"-0.055"
pin height 34.7mm 1.36614173

good website for calculating compression ratio:
Eagle Specialty Products, Inc. - Home
fill out the numbers on the right and click calculate.