 What's our stock compression... |
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 Apr 10, 2008 - 4:07 PM
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Enthusiast  Joined Jan 20, '08 From East Coast Currently Offline Reputation: 1 (100%)  |
How much compression can our 5sfe cyl-head handle as far as pistons and decking are concerned? I can't decide on 9:1, 10:1 or higher?
This post has been edited by 6G96GT: Apr 10, 2008 - 4:07 PM |
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Apr 10, 2008 - 4:07 PM
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 Enthusiast Joined May 12, '06 From Wilmington, NC Currently Offline Reputation: 45 (100%) |
I think stock compression ratio is 9.5:1
--------------------  94 GT - Sold -------- 69 Pontiac Lemans - Sold 88 Alltrac - Sold ---- 04 WRX - Sold 00 GT-S - Sold ------ 91 Miata - project/drift car 95 GT - Sold -------- 96 GT - New Daily Drive |
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Apr 10, 2008 - 4:10 PM
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 Enthusiast Joined Dec 19, '07 From tx Currently Offline Reputation: 22 (100%) |
QUOTE(6strngs @ Apr 10, 2008 - 4:07 PM) [snapback]663316[/snapback] I think stock compression ratio is 9.5:1 True 10:1 will be fine if you use 93 octane - I'm not sure but I know I wouldn't run it on 87 This post has been edited by DEATH: Apr 10, 2008 - 4:10 PM --------------------  ENGINE: '93 RC 3S-GTE/WRC CT-20b [18-20PSI] PERF: TRD/HKS/ARP/NGK/MSD/ACT/Blitz/STRI/APEX'i/TwosRus/GReddy/Magnaflo/KOYO SUSP: Tein/Bilstein/SusTech/ INT: SS-III SEATS/Toyota Hyper Sports EXT: WRC/TRD/404 QUOTE (lagos @ Aug 25, 2010 - 10:13 AM)  Its a safety feature so that people like you don't end up killing themselves or everyone around them. Slow down Paul Walker. 6GC Chat - Go there: [url="http://www.griffgirl.com/forum/chat/index.php[/url] |
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Apr 10, 2008 - 4:11 PM
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 Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
QUOTE(6G96GT @ Apr 10, 2008 - 5:07 PM) [snapback]663315[/snapback] How much compression can our 5sfe cyl-head handle as far as pistons and decking are concerned? I can't decide on 9:1, 10:1 or higher? stock is 9.5:1 you can get it a bit higher by milling the head for a few more na HP, but if your wanting to turbo down the road, i would go 9:1 or the stock 9.5:1 at the most. -------------------- Former Team 5SFTE pro member ;)
 13.6@108MPH, 5SFTE Powered |
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Apr 10, 2008 - 4:30 PM
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Enthusiast Joined Jan 20, '08 From East Coast Currently Offline Reputation: 1 (100%) |
QUOTE(presure2 @ Apr 10, 2008 - 4:11 PM) [snapback]663320[/snapback] QUOTE(6G96GT @ Apr 10, 2008 - 5:07 PM) [snapback]663315[/snapback] How much compression can our 5sfe cyl-head handle as far as pistons and decking are concerned? I can't decide on 9:1, 10:1 or higher? stock is 9.5:1 you can get it a bit higher by milling the head for a few more na HP, but if your wanting to turbo down the road, i would go 9:1 or the stock 9.5:1 at the most. No turbo at for me...so what would you choose for an option then for comp. ratio? I would like to deck the head like you mentioned (not too much though)... thanks guys! |
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Apr 10, 2008 - 5:55 PM
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Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
i would go 10.5:1 max, using 93 octane, minimum.
-------------------- Former Team 5SFTE pro member ;)
13.6@108MPH, 5SFTE Powered |
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Apr 10, 2008 - 7:07 PM
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Enthusiast Joined Jan 20, '08 From East Coast Currently Offline Reputation: 1 (100%) |
QUOTE(presure2 @ Apr 10, 2008 - 5:55 PM) [snapback]663368[/snapback] i would go 10.5:1 max, using 93 octane, minimum. 10.5:1 - is that your max "safe" point? I want the max, but in the "safe" zone. What's after 93 octane? Racing Fuel? Thanks! |
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Apr 11, 2008 - 9:50 AM
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Enthusiast Joined Dec 19, '07 From tx Currently Offline Reputation: 22 (100%) |
QUOTE(6G96GT @ Apr 10, 2008 - 7:07 PM) [snapback]663396[/snapback] QUOTE(presure2 @ Apr 10, 2008 - 5:55 PM) [snapback]663368[/snapback] i would go 10.5:1 max, using 93 octane, minimum. 10.5:1 - is that your max "safe" point? I want the max, but in the "safe" zone. What's after 93 octane? Racing Fuel? Thanks! Yeah but you should be fine if your tuned right and only ever use 93. That combination will make a big improvement in power too, especially if you do the cam upgrade and all the other little things you've been talking about. Do it - build an N/A monster man 
-------------------- ENGINE: '93 RC 3S-GTE/WRC CT-20b [18-20PSI] PERF: TRD/HKS/ARP/NGK/MSD/ACT/Blitz/STRI/APEX'i/TwosRus/GReddy/Magnaflo/KOYO SUSP: Tein/Bilstein/SusTech/ INT: SS-III SEATS/Toyota Hyper Sports EXT: WRC/TRD/404 QUOTE (lagos @ Aug 25, 2010 - 10:13 AM) Its a safety feature so that people like you don't end up killing themselves or everyone around them. Slow down Paul Walker. 6GC Chat - Go there: [url="http://www.griffgirl.com/forum/chat/index.php[/url] |
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Apr 11, 2008 - 6:50 PM
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Enthusiast Joined Jan 20, '08 From East Coast Currently Offline Reputation: 1 (100%) |
Thanks Guys! Will do my best, "safely".
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Apr 12, 2008 - 7:34 AM
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Moderator Joined Oct 1, '02 From fall river, ma Currently Offline Reputation: 13 (100%) |
QUOTE(DEATH @ Apr 11, 2008 - 10:50 AM) [snapback]663572[/snapback] QUOTE(6G96GT @ Apr 10, 2008 - 7:07 PM) [snapback]663396[/snapback] QUOTE(presure2 @ Apr 10, 2008 - 5:55 PM) [snapback]663368[/snapback] i would go 10.5:1 max, using 93 octane, minimum. 10.5:1 - is that your max "safe" point? I want the max, but in the "safe" zone. What's after 93 octane? Racing Fuel? Thanks! Yeah but you should be fine if your tuned right and only ever use 93. That combination will make a big improvement in power too, especially if you do the cam upgrade and all the other little things you've been talking about. Do it - build an N/A monster man its been done. research the name "jim snoodgrass" he made ~147whp, with engine management and all, shaved head, valve job, and one cam (exhaust IIRC) i would expect ~5-10whp more with the newer electronics, and newer motor. (his was a mr2 "5th gen celica equivlent" motor) -------------------- Former Team 5SFTE pro member ;)
13.6@108MPH, 5SFTE Powered |
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Apr 12, 2008 - 11:32 AM
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Enthusiast Joined Jan 20, '08 From East Coast Currently Offline Reputation: 1 (100%) |
one cam, so one was left stock? Do I look him up on google? Thanks for the info!
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