| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
02-06-2008, 07:59 AM
|
||||
|
||||
Piston weight reduction?
So now that i know i need to have some of the pistons lightened,can i tell my shop to cut the bottom of the skirt?As you can see in the picture i have 3 that have a shorter skirt,5 longer skirt.I know they cut at the bottom of the pin boss to lighten but can i cut the skirt instead?Its only 3-5 grams difference.
__________________
1977 Trans Am,400 4 speed,numbers matching car  1979 Bonneville ,1 owner car...  1997 Trans Am convertible,LT1/auto. |
|
#2
02-06-2008, 10:26 AM
|
||||
|
||||
|
i would leave the skirt alone. the reason the skirt is longer is the skirt wall is thinner.
__________________
 1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
|
#3
02-06-2008, 02:40 PM
|
|||
|
|||
|
The skirt also provides the "widest" point for the piston to ride in the bore. DO NOT cut the skirt!
Remove the material from the pin bosses. The flat area below the pin is known as the "balance pad". More material can be safely removed from above the pin in the boss, as long as you stay away from the pin bore. Jim |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
