AP2 nominal bore size
09-05-2015, 10:21 AM
#11
Originally Posted by afzan' timestamp='1441473170' post='23738079
[quote name='Slowcrash_101' timestamp='1441469396' post='23738047']
As long as the ring gap, groove clearance, etc are all to specs I don't see why you can't use AP2 rings in AP1 pistons
To add to Jordan's post, no letter or A pistons have a diameter of 87.993mm to 88.006mm and have a service limit of 86.980mm.
B pistons have a diameter of 86.983 to 86.996 and a service limit of 86.970mm.
Pistons are measured at the skirt, near the bottom of the pin because the top of the piston expands more.
A or 'no mark' pistons are matched to bores that are between 87.01 and 87.02mm
B pistons are matched to bores that are between 87.000 and 87.010mm
With service limit @ 87.07mm for the cylinder bores.
for ships and giggles, oversize bores is 87.25mm to 87.26mm, which would make the displacement 2012.7cc assuming 84.4mm stroke for AP1.
Piston to cylinder clearance is from .0002" to .002" or .004 to .04mm.
Ring to groove gap is .045-.09mm with service limit of .135mm for top ring, .040 - .07mm for bottom ring with service limit of .13mm clearance
Ring gap is .30mm +- .05mm for top ring with .60mm service limit
2nd ring is .60-.75mm with .9mm service limit
.20-.70mm with .90mm service limit for the oil control rings.
As long as the ring gap, groove clearance, etc are all to specs I don't see why you can't use AP2 rings in AP1 pistons
To add to Jordan's post, no letter or A pistons have a diameter of 87.993mm to 88.006mm and have a service limit of 86.980mm.
B pistons have a diameter of 86.983 to 86.996 and a service limit of 86.970mm.
Pistons are measured at the skirt, near the bottom of the pin because the top of the piston expands more.
A or 'no mark' pistons are matched to bores that are between 87.01 and 87.02mm
B pistons are matched to bores that are between 87.000 and 87.010mm
With service limit @ 87.07mm for the cylinder bores.
for ships and giggles, oversize bores is 87.25mm to 87.26mm, which would make the displacement 2012.7cc assuming 84.4mm stroke for AP1.
Piston to cylinder clearance is from .0002" to .002" or .004 to .04mm.
Ring to groove gap is .045-.09mm with service limit of .135mm for top ring, .040 - .07mm for bottom ring with service limit of .13mm clearance
Ring gap is .30mm +- .05mm for top ring with .60mm service limit
2nd ring is .60-.75mm with .9mm service limit
.20-.70mm with .90mm service limit for the oil control rings.
OP ignore the post above and go by this (from my 2000-2007 service manual):
After reading your manual I actually spotted a typo, the service limit for piston to cylinder clearance is incorrectly stated as .004mm, where that number should be .04, .004 is the smallest the clearance can be.
[/quote]
your piston specs are wrong as well as the clearances
09-05-2015, 10:49 AM
#12
Originally Posted by Slowcrash_101' timestamp='1441476248' post='23738121
[quote name='afzan' timestamp='1441473170' post='23738079']
[quote name='Slowcrash_101' timestamp='1441469396' post='23738047']
As long as the ring gap, groove clearance, etc are all to specs I don't see why you can't use AP2 rings in AP1 pistons
To add to Jordan's post, no letter or A pistons have a diameter of 87.993mm to 88.006mm and have a service limit of 86.980mm.
B pistons have a diameter of 86.983 to 86.996 and a service limit of 86.970mm.
Pistons are measured at the skirt, near the bottom of the pin because the top of the piston expands more.
A or 'no mark' pistons are matched to bores that are between 87.01 and 87.02mm
B pistons are matched to bores that are between 87.000 and 87.010mm
With service limit @ 87.07mm for the cylinder bores.
for ships and giggles, oversize bores is 87.25mm to 87.26mm, which would make the displacement 2012.7cc assuming 84.4mm stroke for AP1.
Piston to cylinder clearance is from .0002" to .002" or .004 to .04mm.
Ring to groove gap is .045-.09mm with service limit of .135mm for top ring, .040 - .07mm for bottom ring with service limit of .13mm clearance
Ring gap is .30mm +- .05mm for top ring with .60mm service limit
2nd ring is .60-.75mm with .9mm service limit
.20-.70mm with .90mm service limit for the oil control rings.
[quote name='Slowcrash_101' timestamp='1441469396' post='23738047']
As long as the ring gap, groove clearance, etc are all to specs I don't see why you can't use AP2 rings in AP1 pistons
To add to Jordan's post, no letter or A pistons have a diameter of 87.993mm to 88.006mm and have a service limit of 86.980mm.
B pistons have a diameter of 86.983 to 86.996 and a service limit of 86.970mm.
Pistons are measured at the skirt, near the bottom of the pin because the top of the piston expands more.
A or 'no mark' pistons are matched to bores that are between 87.01 and 87.02mm
B pistons are matched to bores that are between 87.000 and 87.010mm
With service limit @ 87.07mm for the cylinder bores.
for ships and giggles, oversize bores is 87.25mm to 87.26mm, which would make the displacement 2012.7cc assuming 84.4mm stroke for AP1.
Piston to cylinder clearance is from .0002" to .002" or .004 to .04mm.
Ring to groove gap is .045-.09mm with service limit of .135mm for top ring, .040 - .07mm for bottom ring with service limit of .13mm clearance
Ring gap is .30mm +- .05mm for top ring with .60mm service limit
2nd ring is .60-.75mm with .9mm service limit
.20-.70mm with .90mm service limit for the oil control rings.
OP ignore the post above and go by this (from my 2000-2007 service manual):
After reading your manual I actually spotted a typo, the service limit for piston to cylinder clearance is incorrectly stated as .004mm, where that number should be .04, .004 is the smallest the clearance can be.
[/quote]
your piston specs are wrong as well as the clearances
[/quote]
Yeah sorry one mm off on piston no name/A, typo. Everything else is exactly the same, sorry for that. Your service manual is wrong on the clearance.
08-03-2017, 04:29 AM
#13
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Hey sorry to restart an old thread, but I am currently in the process of rebuilding my engine and was curious of the same thing and nobody has given me a definitve answer. Can i use the ap2 piston rings on ap1 pistons?
also i'm using a f22 block with ap1 pistons and crankshaft
also i'm using a f22 block with ap1 pistons and crankshaft
08-03-2017, 08:31 AM
#14
Hey sorry to restart an old thread, but I am currently in the process of rebuilding my engine and was curious of the same thing and nobody has given me a definitve answer. Can i use the ap2 piston rings on ap1 pistons?
also i'm using a f22 block with ap1 pistons and crankshaft
also i'm using a f22 block with ap1 pistons and crankshaft
08-04-2017, 04:13 AM
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