I need help with piston ring gap
12-04-2015, 05:34 AM
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I need help with piston ring gap
Guys,
Here is the instructions that came in with my Supertech 9.5:1 84mm pistons. This is my first time building my own engine.
I am shooting for 400whp and wanted to know with which factor I should go with.
Moderate turbo/Nitrous
Turbo / Nitrous race only
3.307 X .0050 = 16536
3.307 X .0065 = 21495
Here is the instructions that came in with my Supertech 9.5:1 84mm pistons. This is my first time building my own engine.
I am shooting for 400whp and wanted to know with which factor I should go with.
Moderate turbo/Nitrous
Turbo / Nitrous race only
3.307 X .0050 = 16536
3.307 X .0065 = 21495
12-04-2015, 06:59 AM
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How are you going to file the rings? Pay special attention to the gap orientations
Dont touch the oil rings
Keep everything really clean.
Once on the pistons add oil to the bore and rings then install them
Use a wiesco ring compressor
Make sure the valve reliefs are the correct way
The tang on the bearings and rods always face the exhaust side
Dont touch the oil rings
Keep everything really clean.
Once on the pistons add oil to the bore and rings then install them
Use a wiesco ring compressor
Make sure the valve reliefs are the correct way
The tang on the bearings and rods always face the exhaust side
12-04-2015, 07:18 AM
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At the bottom of the list of multipliers thats a really loose gap.
Thats for motors getting pushed to the edge. Tons of heat and they need more ring gap to account for the expansion of the piston.
Youre just going to turbo so use the 2nd multiplier
If you want to be safe go a little looser
17 and 22
You just dont want the rings to touch. The more power you make the more heat goes into the piston. The more that piston will expand
Thats for motors getting pushed to the edge. Tons of heat and they need more ring gap to account for the expansion of the piston.
Youre just going to turbo so use the 2nd multiplier
If you want to be safe go a little looser
17 and 22
You just dont want the rings to touch. The more power you make the more heat goes into the piston. The more that piston will expand
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12-04-2015, 07:48 AM
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Re: I need help with piston ring gap
now if go with the turbo spec .0065
3.307 x .0065 = 2149 top ring
Second Ring
multiply the first gap 21 x 1.25 = 26.25
So basically the pistons gaps will be:
top ring -21
second ring - 26
is this correct? if I was to follow the specs on the sheet provided by Supertech. I just want to make sure my math is correct before I file the rings down.
3.307 x .0065 = 2149 top ring
Second Ring
multiply the first gap 21 x 1.25 = 26.25
So basically the pistons gaps will be:
top ring -21
second ring - 26
is this correct? if I was to follow the specs on the sheet provided by Supertech. I just want to make sure my math is correct before I file the rings down.
12-04-2015, 08:01 AM
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The math seems right
Also read all the print
On that sheet it says that those gaps and multiplications are very generic and can vary by motor
I always use the evans guide for gaps. Ive never ran supertechs tho so it might be different.
Also read all the print
On that sheet it says that those gaps and multiplications are very generic and can vary by motor
I always use the evans guide for gaps. Ive never ran supertechs tho so it might be different.
gauge to measure the "gap" in the ring. The top compression ring for the CP pistons needs to be sized between 0.017-0.021". The formula for sizing the top and bottom compression rings is bore size (in inches) x 0.006", and then add 0.004 for the secondary compression ring gap. Using the formula, my top ring gap was 0.019." My feeler gauge set was not made in sizes such as 0.019", so a combination of 0.015" and 0.004" feeler gauges are used together in
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