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Re: piston pin question
[Re: robnbird]
#1655168
08/05/14 01:14 AM
08/05/14 01:14 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have a small amount...maybe .010 ..but the pin isnt tight in there EDIT mine are a different brand but my CP and Diamond both have a little movement 
Last edited by MR_P_BODY; 08/05/14 01:22 AM.
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Re: piston pin question
[Re: MR_P_BODY]
#1655169
08/05/14 01:21 AM
08/05/14 01:21 AM
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Joined: Nov 2010
Posts: 914
tn
robnbird
OP
super stock
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OP
super stock
Joined: Nov 2010
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tn
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Quote:
I have a small amount...maybe .010 ..but the pin
isnt tight in there
well I am a little surprised that I have that much .
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Re: piston pin question
[Re: Cab_Burge]
#1655171
08/05/14 02:17 AM
08/05/14 02:17 AM
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Joined: Nov 2010
Posts: 914
tn
robnbird
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OP
super stock
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Quote:
Quote:
Quote:
I have a small amount...maybe .010 ..but the pin
isnt tight in there
well I am a little surprised that I have that much .
It is way better to have movement on wrist pins cold than it is to not have any movement cold    I've seen duoble Tru Arcs kicked out of the retaining grooves due to to little end clearances on them  It ruined the cylinder it happen to   The engine asembler, a freind of mine, didn't know to check for end play on every pin back then  As far as wire reatiners on Mahle brand piston I have no personel experiences with them, sorry  The old Hemi and (I think) early Mopar V8 motors all used round 3/4 circumference wire retainers back when They had lots of end play on some of them also  Contact Mahle tech. and ask them the minimums and maximum end play before telling them how much yours have 
thanks cab I will call them tomorrow .. and maybe at running temp some of the clearance will be taken up . here is a pic of the piston .
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Re: piston pin question
[Re: robnbird]
#1655172
08/05/14 02:20 AM
08/05/14 02:20 AM
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Joined: Nov 2010
Posts: 914
tn
robnbird
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OP
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Joined: Nov 2010
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tn
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Re: piston pin question
[Re: robnbird]
#1655173
08/05/14 02:36 AM
08/05/14 02:36 AM
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Joined: Nov 2010
Posts: 914
tn
robnbird
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OP
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tn
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Re: piston pin question
[Re: Sport440]
#1655175
08/05/14 12:22 PM
08/05/14 12:22 PM
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Joined: Nov 2010
Posts: 914
tn
robnbird
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OP
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Quote:
Gotta have some clearence IMO, Your .015/.020 is about right. Shouldnt Ever be .00000 The pin will expand with heat.
well it not .00000 but the point is the Hemi has very little compared to this much but I am calling mahle today to see what they say and from opinion on here I will use them and be Ok with it . thanks
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Re: piston pin question
[Re: Sport440]
#1655176
08/05/14 12:27 PM
08/05/14 12:27 PM
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Joined: Jan 2012
Posts: 2,649
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,649
Stuttgart, Arkansas
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Stock 426 Hemi spec is .006"-.012". I assume your engine would want similar. If you are using wire keepers make sure you have the proper pins for that. That are different from all others. Instead of being flat on the ends the are chamfered. When the pin slides to one side the chamfer touches the wire and pushes it down against the groove instead of a flat end trying to push it out.
2011 Drag Pak Challenger
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Re: piston pin question
[Re: rickseeman]
#1655177
08/05/14 12:52 PM
08/05/14 12:52 PM
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Joined: Nov 2010
Posts: 914
tn
robnbird
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Quote:
Stock 426 Hemi spec is .006"-.012". I assume your engine would want similar. If you are using wire keepers make sure you have the proper pins for that. That are different from all others. Instead of being flat on the ends the are chamfered. When the pin slides to one side the chamfer touches the wire and pushes it down against the groove instead of a flat end trying to push it out.
just hung up the phone and Mahle said .020 to .025 and did not have the pin expansion answer . But said all of their piston pin had wire locks and the clearance was .020 to .025 on all their applications . So I good with this piston and Mahle was very helpful in giving me information
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Re: piston pin question
[Re: robnbird]
#1655178
08/05/14 01:16 PM
08/05/14 01:16 PM
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Joined: Apr 2005
Posts: 1,505
TN
SCATPACK 1
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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WOW, that is a really short piston. What is the weight on each one?
Old Geezer Racing
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Re: piston pin question
[Re: dogdays]
#1655181
08/05/14 10:23 PM
08/05/14 10:23 PM
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Joined: Nov 2010
Posts: 914
tn
robnbird
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Quote:
NASCAR pistons that are coming up used on the 'bay all have the wire locks. The Spirolocks are going away. Double Tru-Arcs went away before them.
r.
well I ok with the wire lock after wrestling with these wire to get them in place . I think the wire should be just a tad larger and the grove a tad deeper .
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Re: piston pin question
[Re: robnbird]
#1655182
08/05/14 11:16 PM
08/05/14 11:16 PM
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Joined: Aug 2003
Posts: 1,313
Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,313
Charlotte, NC
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Quote:
Quote:
NASCAR pistons that are coming up used on the 'bay all have the wire locks. The Spirolocks are going away. Double Tru-Arcs went away before them.
r.
well I ok with the wire lock after wrestling with these wire to get them in place . I think the wire should be just a tad larger and the grove a tad deeper .
Difficult to install also means difficult to get out too, a good thing. I'll use oversize locks in some high piston speed cases, put the gaps at 6 o'clock.
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Re: piston pin question
[Re: LSP]
#1655183
08/06/14 08:54 PM
08/06/14 08:54 PM
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Joined: Nov 2010
Posts: 914
tn
robnbird
OP
super stock
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OP
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tn
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Quote:
Quote:
Quote:
NASCAR pistons that are coming up used on the 'bay all have the wire locks. The Spirolocks are going away. Double Tru-Arcs went away before them.
r.
well I ok with the wire lock after wrestling with these wire to get them in place . I think the wire should be just a tad larger and the grove a tad deeper .
Difficult to install also means difficult to get out too, a good thing. I'll use oversize locks in some high piston speed cases, put the gaps at 6 o'clock.
I have already installed the wire keepers and I put them just past the notch that is used to remove the wire if necessary .. thanks for the info .
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