 Difference in piston size? |
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 Aug 20, 2010 - 6:49 PM
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 Enthusiast  Joined May 29, '09 From Lake Ariel, PA Currently Offline Reputation: 4 (100%)  |
I was looking into some weisco pistons and I was wondering whats the difference between 79.5mm 82mm and 82.5 mm. Would there need to be any boreing out of the engine to make the bigger pistons fit? and are there really big power gains because of increasing the piston size. Any help in understanding this is much appreciated.
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Aug 22, 2010 - 12:31 PM
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 Enthusiast Joined Mar 22, '07 From Houston, TX Currently Offline Reputation: 4 (100%) |
other than the size, theres no difference. and es you will need to get the block bored for the exact size pistons you put in.. otherwise they wont fit(pistons bigger than hole)...or they wont seal and the motor wont run(hole bigger than piston)
very small HP gains from bigger pistons -------------------- QUOTE "And, as always, your friendship, help, and dedication to the advancement of Texas Celica dominance is GREATLY appreciated. Thanks bro." -DEATH 1994 GT: V6 swap, 5speed E53 W/ LSD, All Power, now RED 1995 ST: SOLD @273k miles, Auto, all power, CarPC, White 1994 ST: Totaled, 5spd, all power, Red RIP 07/09/09 @ 241,810 1994 Lexus LS400: This is my new DD |
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Aug 23, 2010 - 12:37 AM
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Enthusiast Joined May 29, '09 From Lake Ariel, PA Currently Offline Reputation: 4 (100%) |
so whats the reason behind making bigger pistons for the same engine? im guessing maybe when you rebuild the engine they bore it out a little and you need bigger pistons or am i wrong?
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Aug 23, 2010 - 9:38 PM
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Enthusiast Joined Mar 22, '07 From Houston, TX Currently Offline Reputation: 4 (100%) |
if the cyl walls get too scratched/damaged they need to bore it out untill its a smooth finish
-------------------- QUOTE "And, as always, your friendship, help, and dedication to the advancement of Texas Celica dominance is GREATLY appreciated. Thanks bro." -DEATH 1994 GT: V6 swap, 5speed E53 W/ LSD, All Power, now RED 1995 ST: SOLD @273k miles, Auto, all power, CarPC, White 1994 ST: Totaled, 5spd, all power, Red RIP 07/09/09 @ 241,810 1994 Lexus LS400: This is my new DD |
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Aug 24, 2010 - 7:49 PM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
you will get a slight gain with the higher displacement, but the big gains are when you boost it.
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Aug 25, 2010 - 10:37 AM
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Enthusiast Joined May 29, '09 From Lake Ariel, PA Currently Offline Reputation: 4 (100%) |
I see alright thanks guys
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