Piston/Cylinder clearance
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
Originally Posted by chriswtx
Did you get a chance to call Diamond and ask about the 3 different pistons all with the same part numbers... 
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Originally Posted by 67Firebird455
No sir, and I'm getting kinda pissed off. I'm gonna have to call them tomorrow hopefully!
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Yeah it looks like you have an newer updated piston from what you started with. Same part number but different design now. The other pistons might have been a much older set? I haven't seen many like that in a long time.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Originally Posted by chriswtx
Thats a real pain for them to make changes and keep the same part number. We have 3 different pistons with the same part number...
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Teching In
Joined: Jan 2005
Posts: 19
Likes: 0
Hey there guys, I just got off the phone with Eric @ Victory, its seems you have received two updated redsigned style 11503s. This is where you are seeing a differents in looks. We continue to update and make our product better for our customers, however if we made a new part# for these everytime we made a update we would have a million part numbers.
Now on to your problem, I spoke with eric, and I would really like to get both the new pistons we just sent you and a old piston that you our currently using. Something doesnt sound right, your block should be finish honed to 3.905 for the use of these pistons. The actually piston size should mic @ 3.9015 giving you a .0035 piston to wall clearance. Once I rec your pistons back I will measure them myself and see where the error is. If you have any questions please feel from to give me a call @ the shop, 586-792-6620.
Thank You For Your Time.
Now on to your problem, I spoke with eric, and I would really like to get both the new pistons we just sent you and a old piston that you our currently using. Something doesnt sound right, your block should be finish honed to 3.905 for the use of these pistons. The actually piston size should mic @ 3.9015 giving you a .0035 piston to wall clearance. Once I rec your pistons back I will measure them myself and see where the error is. If you have any questions please feel from to give me a call @ the shop, 586-792-6620.
Thank You For Your Time.
Originally Posted by DiamondMike
Something doesnt sound right, your block should be finish honed to 3.905 for the use of these pistons. The actually piston size should mic @ 3.9015 giving you a .0035 piston to wall clearance.
.
.
Cool, mine all measured 3.9015 when I measured them in the correct place...
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
Originally Posted by 67Firebird455
If I'm not mistaken... Shouldn't the clearance on a 15+psi boosted motor be over .005"?
Teching In
Joined: Jan 2005
Posts: 19
Likes: 0
Originally Posted by 67Firebird455
If I'm not mistaken... Shouldn't the clearance on a 15+psi boosted motor be over .005"?
Originally Posted by DiamondMike
With our skirt profiles, you do not need to run them that lose. If this is a street driven engine, .0035-.004 piston to wall will be perfect. If you give it too much piston to wall clearance you will have excessive piston noise on fireup.
I was going to shoot for .004 clearence. I figure at 14psi I will be at 760rwhp. With the added cooling of the Meth to keep combustion temps down I think it should be fine.
What do you think...??Or should I stick with .0035???
Teching In
Joined: Jan 2005
Posts: 19
Likes: 0
Originally Posted by chriswtx
I was going to shoot for .004 clearence. I figure at 14psi I will be at 760rwhp. With the added cooling of the Meth to keep combustion temps down I think it should be fine.
What do you think...??Or should I stick with .0035???
What do you think...??Or should I stick with .0035???
