Quote:well I am a little surprised that I have that much .
I have a small amount...maybe .010 ..but the pin
isnt tight in there
Quote:It is way better to have movement on wrist pins cold than it is to not have any movement coldQuote:well I am a little surprised that I have that much .
I have a small amount...maybe .010 ..but the pin
isnt tight in there
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 
Quote: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 .Quote:It is way better to have movement on wrist pins cold than it is to not have any movement coldQuote:well I am a little surprised that I have that much .
I have a small amount...maybe .010 ..but the pin
isnt tight in there
.jpg "8230526-PART_1407212731944_20140804_231556(1).jpg")
Quote: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
Gotta have some clearence IMO, Your .015/.020 is about right. Shouldnt Ever be .00000 The pin will expand with heat.
Quote: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
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.
Quote:460gr the tech at Mahle said that was approximately the size that they ran in Nascar . these piston are manufactured in Morristown , Tn.
WOW, that is a really short piston. What is the weight on each one?
Quote: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 .
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.
Quote:Quote: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 .
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.
Quote: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 .Quote:Quote: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 .
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.
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.