CP
All compression ratios are based on zero deck height
1.2mm head gasket (7.13cc)
RB25 @ 62.5cc
RB26 @ 64.5cc
They assure me they have done alot of work to make sure the facts are correct.
p/n= CP-RB30/26-.20
Flat top with no valve pockets
8.2:1 COMPRESSION RATIO with RB25 head and bit less with RB26 head
21mm pin
1.280" compression height
Only stocked in 0.20 thou oversize but can be custom ordered in any size.
p/n= CP-RB30/26-.20-9.0
6.0cc dome top,
9.0:1 COMPRESSION RATIO with RB25 head and bit less with RB26 head
21mm pin
1.280" compression height
Only stocked in 0.20 thou oversize but can be custom ordered in any size.
*Care must be taken when using on RB26 with more than 11.5mm valve lift*
ARIAS
Suit RB30/26
p/n= AP332103
flat top
21mm pin
1.280" compression height
Only stocked in 0.20 thou oversize (86.5mm).
COMPRESSION RATIO 8.4-8.6
Suit RB30/26
p/n= AP332104
10.6cc dome top
21mm pin
1.280" compression height
Only stocked in 0.20 thou oversize (86.5mm).
COMPRESSION RATIO 9.2-9.4
Suit RB30/25
p/n= AP332105
13cc dome top
21mm pin
1.280" compression height
Only stocked in 0.20 thou oversize (86.5mm).
COMPRESSION RATIO 9.5-9.8
WISECO
Skyline RB30 w/ DOHC RB25det cylinder head
1.260" compresion height, 66.5cc head chamber, Dish top -11.3cc, 7.0:1 compression ratio, 21mm pin, 1mm gasket thickness, 1mm deck clearance.
K577M865 86.5mm
K577M87 87.00mm