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Wrist pin lenght
#2734371
01/19/20 09:00 AM
01/19/20 09:00 AM
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Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
dart_73_br
OP
mopar
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OP
mopar
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
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Hello, I need your opinion on this.
Stock pin is 2.75" long. Want to run some boosted application and found some 2.65" pins that handles 300hp each.
So there Will be a 0.10" difference 0.05" each site. Do your think this room to spiro locks can created some problem or no problem here?
Br
1973 Brasilian Dart
E100, boosted 390"
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Re: Wrist pin lenght
[Re: dart_73_br]
#2734378
01/19/20 09:47 AM
01/19/20 09:47 AM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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I would not be concerned with the difference in length as much as the difference in weight.
"use it 'till it breaks, replace as needed"
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Re: Wrist pin lenght
[Re: TRENDZ]
#2734496
01/19/20 02:31 PM
01/19/20 02:31 PM
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Joined: Dec 2005
Posts: 11,494
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,494
Fulton County, PA
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I have always read and been told that the locks should fit to the pins fairly snug. Any free space can result in the pin beating the locks out of the groove. You can use a short pin, but the piston needs to be machined to match it.
I'm not the sharpest engine guy, but I pay attention. Will see if the sharp guys agree.
Last edited by CMcAllister; 01/19/20 02:32 PM.
If the results don't match the theory, change the theory.
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Re: Wrist pin lenght
[Re: dart_73_br]
#2734531
01/19/20 04:10 PM
01/19/20 04:10 PM
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Joined: Aug 2003
Posts: 43,096
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,096
Bend,OR USA
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How much thicker are the new pins and what material are they made from?
Blower motors need strong stiff wrist pins to keep them from bending and hurting the motor.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Wrist pin lenght
[Re: Cab_Burge]
#2734783
01/20/20 09:33 AM
01/20/20 09:33 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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How much thicker are the new pins and what material are they made from?
Blower motors need strong stiff wrist pins to keep them from bending and hurting the motor. BENDING wrist pins ? Is that a common accordance in Bend, OREeGONE ? Good to see ur not BENDING THE RULES on smilie limits per post ! .. But zErO smilies?.... is ur keyboard mAlFuNcTiOnInG ?  
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Re: Wrist pin lenght
[Re: dOc !]
#2734787
01/20/20 09:43 AM
01/20/20 09:43 AM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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You can absolutely bend wrist pins. Using “standard” pins does result in smile shaped wrist pins. I’ve had to cut out more than one set in two different engines.
"use it 'till it breaks, replace as needed"
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Re: Wrist pin lenght
[Re: dart_73_br]
#2735010
01/20/20 05:50 PM
01/20/20 05:50 PM
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Joined: Apr 2003
Posts: 3,508
Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,508
Tulsa, Oklahoma
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Hello, I need your opinion on this.
Stock pin is 2.75" long. Want to run some boosted application and found some 2.65" pins that handles 300hp each.
So there Will be a 0.10" difference 0.05" each site. Do your think this room to spiro locks can created some problem or no problem here?
Br I would not use them in a piston that was not designed for them or at least modified.
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Re: Wrist pin lenght
[Re: dart_73_br]
#2741196
02/09/20 12:42 PM
02/09/20 12:42 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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Hello, I need your opinion on this.
Stock pin is 2.75" long. Want to run some boosted application and found some 2.65" pins that handles 300hp each.
So there Will be a 0.10" difference 0.05" each site. Do your think this room to spiro locks can created some problem or no problem here?
Br DO NOT use a 2.650" long pin in a piston made for a 2.750" long pins, ever. The question isn't if, but how many pistons you'll throw on the track if you assemble your engine that way.
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