 40 over pistons in 5sfe, using 7afe pistons |
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 Dec 24, 2010 - 10:22 PM
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 Enthusiast  Joined Aug 4, '05 From Ocala Fl Currently Offline Reputation: 0 (0%)  |
alright i have a question that maybe some one could help me with. i am going to rebuild my 5sfe engine and i have a set of 40 pistons for a 7afe laying around. they are brand new with the wrist pins and rings. could i use these on my 5sfe engine if i gave the pistons to the machine shop and told them this is whats going in. any help would be great. thanks
-------------------- 1997 Celica Convertible (going to rebuild again)
1994 TT 6Spd Supra 1969 Camaro 1997 S-10 1997 Astro Van |
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Dec 24, 2010 - 10:33 PM
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 Enthusiast Joined May 10, '10 From MA Currently Offline Reputation: 37 (100%) |
i highly doubt it. the 7a has narrower cylinders than the 5s (someone correct me if I'm wrong)
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Dec 24, 2010 - 11:52 PM
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 Enthusiast Joined Jan 29, '07 From Hoyt Lakes, MN Currently Offline Reputation: 11 (100%) |
.40 over will make the walls a bit narrower, but its something that has been done before. My buddies patiently collecting parts for his ultimate 5sfte built. Wiseco 88.0mm pistons.
-------------------- 98 Celica gt red- totaled deer
94 Celica st black DD (bad weather beater)- totaled deer 95 Celica gt silver- chassis sold 88 Celica All-Trac (Burned to a crisp) 94 Celica gt white (sold) In need of a rust free chassis!!!! |
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Dec 25, 2010 - 12:49 AM
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Enthusiast Joined Aug 4, '05 From Ocala Fl Currently Offline Reputation: 0 (0%) |
I know the walls will be a bit narrower but after this build I don't plan on rebuilding again. If these pistons will work then it will save me some money and get my build a little closer to finish. I'm not going to be turboing or anything crazy. Just looking to make it a reliable car for my wife to drive. I'm picking up a motor that runs with 165k miles and it's knocking in the bottom end for 100 bucks. So I figured I would drop her off at the shop to get the cylinders bored and honed put in some new rods and mains and ur normal timing belt water pump oil pump and valve stem seals. If these pistons will work then I would say it's a go.
This post has been edited by STCelica: Dec 25, 2010 - 12:51 AM -------------------- 1997 Celica Convertible (going to rebuild again)
1994 TT 6Spd Supra 1969 Camaro 1997 S-10 1997 Astro Van |
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Dec 25, 2010 - 5:11 AM
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 Enthusiast Joined Dec 9, '05 From Germany Currently Offline Reputation: 0 (0%) |
7A-FE pistons in a 5S-FE won't work since they are 81mm in diameter and the 5S-FE got a 87mm bore.
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Dec 25, 2010 - 8:25 AM
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Enthusiast Joined Aug 4, '05 From Ocala Fl Currently Offline Reputation: 0 (0%) |
Is that stock pistons size? Like I said the pistons I have are 40 over. If there bigger then the stock 5s pistons then they should be able to bore the cylinder to make them fit, correct?
-------------------- 1997 Celica Convertible (going to rebuild again)
1994 TT 6Spd Supra 1969 Camaro 1997 S-10 1997 Astro Van |
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Dec 25, 2010 - 8:28 AM
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 Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
no.
-------------------- Former Team 5SFTE pro member ;)
 13.6@108MPH, 5SFTE Powered |
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Dec 25, 2010 - 8:42 AM
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Enthusiast Joined May 10, '10 From MA Currently Offline Reputation: 37 (100%) |
they're not bigger than the 5s because the 7a cylinders are narrower. If the 7a is 81mm and the pistons are 40 over, that means they are 81.4mm, not 85mm. The 5s has a 87mm bore. If you look in the stickies it would tell you.
You can't hone the 5s an expect it to become smaller... |
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Dec 25, 2010 - 12:45 PM
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Enthusiast Joined Aug 4, '05 From Ocala Fl Currently Offline Reputation: 0 (0%) |
K I see what ur saying now. Thanks. And merry Christmas.
-------------------- 1997 Celica Convertible (going to rebuild again)
1994 TT 6Spd Supra 1969 Camaro 1997 S-10 1997 Astro Van |
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Dec 25, 2010 - 2:38 PM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
thats only the first problem, there is also wrist pin location and diameter. i highly doubt the 7A pistons will fit on 5S rods.
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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