Nitrous Motor Piston Choice and Ring Gap?
01-14-2010, 09:38 PM
#1
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Nitrous Motor Piston Choice and Ring Gap?
Im looking to start building a new motor and looking for some tips on what piston ring gap to run. If I am correct, when running a large shot, you want a file fit tight gap?
Im going to be build a bored 4.3 with forged pistons, 75-150 shot.....maybe more later down the line..
Also, why is there such a large difference in price between forged pistons? Is there actually a quality difference or just name?
Im looking at these pistons but I dont know if there are certain pistons that are better than others.these
Im going to be build a bored 4.3 with forged pistons, 75-150 shot.....maybe more later down the line..
Also, why is there such a large difference in price between forged pistons? Is there actually a quality difference or just name?
Im looking at these pistons but I dont know if there are certain pistons that are better than others.these
01-15-2010, 05:08 PM
#2
Here's a little table that will be helpful in gapping them. *COURTESY OF WISECO PISTONS*
"Failure to ensure proper ring end gap may cause the ring tips to butt, and engine damage could occur.
1. A torque plate should be attached to the engine block or cylinder (if applicable), and torqued to specifications.
2. Check the end gap by placing the ring into the cylinder. Cylinder bore should be free of taper. Use the piston to square up the ring in the bore, and check the end gap by using a feeler gauge.
3. See table below for proper ring end gap for your application.
4. The oil rails may be installed without modifying the end gap. The gap should be a minimum of .010”.
Ring Gap Table Instructions
1. This table is in inches. If you are measuring your bore in millimeters, you will need to convert to inches by dividing your bore size by 25.4.
2. Multiply your inch bore size by the “Bore x” column for your application to determine the end gap.
Example: For the top ring of an ATV with a 4.0” bore, multiply 4.0 X .004 = .016
Notes:
1. The chart above is a general guideline. Each ring should be fitted to the particular cylinder in which they are to be installed.
2. The gap on the second ring should always be larger than the top ring end gap, this will help to reduce top ring flutter or lifting."
"Failure to ensure proper ring end gap may cause the ring tips to butt, and engine damage could occur.
1. A torque plate should be attached to the engine block or cylinder (if applicable), and torqued to specifications.
2. Check the end gap by placing the ring into the cylinder. Cylinder bore should be free of taper. Use the piston to square up the ring in the bore, and check the end gap by using a feeler gauge.
3. See table below for proper ring end gap for your application.
4. The oil rails may be installed without modifying the end gap. The gap should be a minimum of .010”.
Ring Gap Table Instructions
1. This table is in inches. If you are measuring your bore in millimeters, you will need to convert to inches by dividing your bore size by 25.4.
2. Multiply your inch bore size by the “Bore x” column for your application to determine the end gap.
Example: For the top ring of an ATV with a 4.0” bore, multiply 4.0 X .004 = .016
Code:
Application Top Ring Bore x 2nd Ring Bore x Dirt / ATV / Snow / PWC .0040” .0050” High-Performance Street / Strip .0045” .0055” Street-Moderate Turbo / Nitrous .0050” .0055” Late Model Stock .0050” .0055” Circle Track/Drag Race .0055” .0060” Blown Race Only .0065” .0070” Nitrous Race Only .0070” .0075”
1. The chart above is a general guideline. Each ring should be fitted to the particular cylinder in which they are to be installed.
2. The gap on the second ring should always be larger than the top ring end gap, this will help to reduce top ring flutter or lifting."
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