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What's our stock compression... - 6G Celicas Forums

Topic #57551 11 posts Started by 6G96GT
6G96GT
#1
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
6strngs
#2
I think stock compression ratio is 9.5:1
94 GT - Sold -------- 69 Pontiac Lemans - Sold88 Alltrac - Sold ---- 04 WRX - Sold00 GT-S - Sold ------ 91 Miata - project/drift car95 GT - Sold -------- 96 GT - New Daily Drive
DEATH
#3
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QUOTE(6strngs @ Apr 10, 2008 - 4:07 PM) [snapback]663316[/snapback]
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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/KOYOSUSP: Tein/Bilstein/SusTech/INT: SS-III SEATS/Toyota Hyper SportsEXT: WRC/TRD/404QUOTE (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]
presure2
#4
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QUOTE(6G96GT @ Apr 10, 2008 - 5:07 PM) [snapback]663315[/snapback]
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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
6G96GT
#5
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QUOTE(presure2 @ Apr 10, 2008 - 4:11 PM) [snapback]663320[/snapback]
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QUOTE(6G96GT @ Apr 10, 2008 - 5:07 PM) [snapback]663315[/snapback]
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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!
presure2
#6
i would go 10.5:1 max, using 93 octane, minimum.
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
6G96GT
#7
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QUOTE(presure2 @ Apr 10, 2008 - 5:55 PM) [snapback]663368[/snapback]
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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!
DEATH
#8
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QUOTE(6G96GT @ Apr 10, 2008 - 7:07 PM) [snapback]663396[/snapback]
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QUOTE(presure2 @ Apr 10, 2008 - 5:55 PM) [snapback]663368[/snapback]
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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 biggrin.gif
ENGINE: '93 RC 3S-GTE/WRC CT-20b [18-20PSI]PERF: TRD/HKS/ARP/NGK/MSD/ACT/Blitz/STRI/APEX'i/TwosRus/GReddy/Magnaflo/KOYOSUSP: Tein/Bilstein/SusTech/INT: SS-III SEATS/Toyota Hyper SportsEXT: WRC/TRD/404QUOTE (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]
6G96GT
#9
Thanks Guys! Will do my best, "safely".
presure2
#10
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QUOTE(DEATH @ Apr 11, 2008 - 10:50 AM) [snapback]663572[/snapback]
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QUOTE(6G96GT @ Apr 10, 2008 - 7:07 PM) [snapback]663396[/snapback]
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QUOTE(presure2 @ Apr 10, 2008 - 5:55 PM) [snapback]663368[/snapback]
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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 biggrin.gif

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
6G96GT
#11
one cam, so one was left stock? Do I look him up on google? Thanks for the info!
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