Pistons
10-09-2022, 02:40 AM
#1
Pistons
Hi, I have a gen 6 502 that was taken out to 4.530 using wiseco pro tru pistons. Turns out one is junk and they stopped making them. I have been offered a set of je pistons in 4.525, will that be ok to use them or will I end up too much clearance?
cheers
cheers
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JaniH (10-13-2022)
10-09-2022, 03:10 AM
#2
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..
Last edited by JaniH; 10-09-2022 at 06:18 AM.
10-09-2022, 06:37 AM
#3
VIP Member
VIP Member
I always thought forged pistons NEEDED a .005 clearance?
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Unlimited jd (10-09-2022)
10-09-2022, 07:40 AM
#4
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That will be very loose.
Send the pistons out to line2line to get their ablative skirt coating done. It will tighten the clearance up. Be reasonably priced.
Piston to all clearance will depend on bore size and piston material.
Send the pistons out to line2line to get their ablative skirt coating done. It will tighten the clearance up. Be reasonably priced.
Piston to all clearance will depend on bore size and piston material.
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bajaman (10-09-2022)
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thirdchildhood (10-10-2022)
10-09-2022, 10:18 AM
#7
It all depends on what you actual bore size is. The ProTru piston usually had .004-.005 piston to wall. That'll probably put your undersized piston at .010. if it's a 2618 piston you'd probably be ok. If it's a 41xx material it's wayyyyy to much.
Wiseco will make that piston for you. You can buy just one. And there's odds they'll have some stashed away somewhere. Call them direct. Don't rely on someone in the middle that makes money off the sale.
Wiseco will make that piston for you. You can buy just one. And there's odds they'll have some stashed away somewhere. Call them direct. Don't rely on someone in the middle that makes money off the sale.
Last edited by Smitty275; 10-09-2022 at 10:21 AM.
10-09-2022, 11:53 AM
#8
It all depends on what you actual bore size is. The ProTru piston usually had .004-.005 piston to wall. That'll probably put your undersized piston at .010. if it's a 2618 piston you'd probably be ok. If it's a 41xx material it's wayyyyy to much.
Wiseco will make that piston for you. You can buy just one. And there's odds they'll have some stashed away somewhere. Call them direct. Don't rely on someone in the middle that makes money off the sale.
Wiseco will make that piston for you. You can buy just one. And there's odds they'll have some stashed away somewhere. Call them direct. Don't rely on someone in the middle that makes money off the sale.
10-13-2022, 05:50 AM
#9
Platinum Member
Platinum Member
iTrader: (1)
1. The J/E piston is for a 4.525 bore OR is it for a 4.530 bore and measures 4.525?
2. are either set of pistons 2618 or are they 4032?
3. when you buy say a set of J/E "4.530 pistons", unless you call JE up and custom order a set of ACTUAL 4.530 OD pistons (which would require a 4.535 bore =/_), you are actually getting a piston that fits that 4.530 bore size once accounting for "normal" clearance. Now, lets say the piston is a SRP 4032, it would measure about 4.526, a 4.530 bore would give you .004 piston too wall. Lets say it was a 2618, it would be more like 4.525 OD and give you .005 piston to wall in a actual 4.530 bore. Now, lets say you wanted a target clearance of .007 for some reason, you might hone block to 4.532 , or if piston started life a 4.525 and is worn to 4.524 youll end up at .006 or higher. You may very well NOT have a problem, Smitty
2. are either set of pistons 2618 or are they 4032?
3. when you buy say a set of J/E "4.530 pistons", unless you call JE up and custom order a set of ACTUAL 4.530 OD pistons (which would require a 4.535 bore =/_), you are actually getting a piston that fits that 4.530 bore size once accounting for "normal" clearance. Now, lets say the piston is a SRP 4032, it would measure about 4.526, a 4.530 bore would give you .004 piston too wall. Lets say it was a 2618, it would be more like 4.525 OD and give you .005 piston to wall in a actual 4.530 bore. Now, lets say you wanted a target clearance of .007 for some reason, you might hone block to 4.532 , or if piston started life a 4.525 and is worn to 4.524 youll end up at .006 or higher. You may very well NOT have a problem, Smitty
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JaniH (10-13-2022)
10-13-2022, 06:26 AM
#10
Registered
Picture of the junk piston?
