HellonFire
03-05-2007, 12:24 AM
Ok.. I have my girlfriends block here, 86.5mm CP Pistons. Does anyone know the recommended ring gap?
She's planning on a GT28RS or bigger I think, so take that into consideration as well.
Because this makes no sense.
Determining Ring Gap
To determine the ring end gap look for your application in the proceeding
table. ALL BORES MUST BE CONVERTED TO INCHES.
Example: Bore size is 81mm – to find top ring end gap for a
street application:
.016” is the minimum allowable clearance.
CP Piston Ring Recommendations
Ring End Gap Chart
Ring Orientation Diagram
81mm/25.4= 3.189 inches
(3.189 x .005)= .016”
Application Top Ring Second Ring Oil Ring
Street/Hi Bore x .0045/.005” Bore x .005/.006” Min. .015”
Performance
Drag Racing Bore x .006” Bore x .0065/.007” Min .015”
Circle Track
Nitrous/Turbo Bore x .0065/.007” Bore x .007/.008” Min .015”
Supercharged
Motorcycle/ATV Bore x .005” Bore x .006” Min .015”
Should I do Street/High Bore or Turbo? I figure turbo.. So..
Top Ring should be.. .022-.023
The gap on the Ring that CAME with the pistons is .025 :confused:
Second ring should be.. .023-.028
Ring CAME .017
Oil Rings.. They don't even fit in the damn block.
So am I doing this right? Or should I be using Factory recommendations which I think is like .015??
If so.. Anyone have a ring file?
Also, it also says this.
Important: Ring sets are manufactured to fit specific bores.
For every .001” over the intended bore size, ring gap will
increase by .00314”
Does that mean since I'm .5 over stock my gaps should be increased by .00314x5 or, if I was running 86.5mm pistons in a 87mm block that would be the case?
Thanks for any help..
Tyler
She's planning on a GT28RS or bigger I think, so take that into consideration as well.
Because this makes no sense.
Determining Ring Gap
To determine the ring end gap look for your application in the proceeding
table. ALL BORES MUST BE CONVERTED TO INCHES.
Example: Bore size is 81mm – to find top ring end gap for a
street application:
.016” is the minimum allowable clearance.
CP Piston Ring Recommendations
Ring End Gap Chart
Ring Orientation Diagram
81mm/25.4= 3.189 inches
(3.189 x .005)= .016”
Application Top Ring Second Ring Oil Ring
Street/Hi Bore x .0045/.005” Bore x .005/.006” Min. .015”
Performance
Drag Racing Bore x .006” Bore x .0065/.007” Min .015”
Circle Track
Nitrous/Turbo Bore x .0065/.007” Bore x .007/.008” Min .015”
Supercharged
Motorcycle/ATV Bore x .005” Bore x .006” Min .015”
Should I do Street/High Bore or Turbo? I figure turbo.. So..
Top Ring should be.. .022-.023
The gap on the Ring that CAME with the pistons is .025 :confused:
Second ring should be.. .023-.028
Ring CAME .017
Oil Rings.. They don't even fit in the damn block.
So am I doing this right? Or should I be using Factory recommendations which I think is like .015??
If so.. Anyone have a ring file?
Also, it also says this.
Important: Ring sets are manufactured to fit specific bores.
For every .001” over the intended bore size, ring gap will
increase by .00314”
Does that mean since I'm .5 over stock my gaps should be increased by .00314x5 or, if I was running 86.5mm pistons in a 87mm block that would be the case?
Thanks for any help..
Tyler