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» Northern California Ford Owners     » Automotive   » Tech Talk   » Octane minimum with 9.77:1 compression ratio?

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Author Topic: Octane minimum with 9.77:1 compression ratio?
BUCK_FIFTY
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I bought a set of AFR 1.90/1.60 , 60cc heads for my 94 GT. My car is also my daily driver and I use 87 octane during my daily 60 mile round trip from work everyday. I was told that the new compression ratio when I install the heads will be 9.77:1. Will I still be able to use 87 octane with 10 degree timing for my daily commute, or will I need to move up in octane and change the timing to prevent pinging and detonation? [Confused]

Also, does anyone know what my compression will be if I went with low comp pistons on a 306 block I plan on getting? [Confused]

[ January 02, 2004, 12:36 AM: Message edited by: Yung Than ]

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"Funny how cheap ass people have money to do it right the second time, haha!"
Posts: 789 | From: 510 | Registered: Jan 2002  |  :
93mustangt
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you should be able to run on 87 the worst would be 89. My friend is running 10.7 to 1 and he runs 91. [patriot]
Posts: 543 | From: Orange county, Ca | Registered: Dec 2001  |  :
4RS FED
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i used 91 with my 12:1 383 aluminum headed small block. [burnout]

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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002  |  :
BlackNGold
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My 94GT was prone to detonation....I would only run 91 octane in it....

If you get aftermarket heads, I would suggest getting a custom chip/dyno tune and use 87 octane on the dyno so you know you will be safe running anything higher...

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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001  |  :
DropTopFox
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Talk to FasterDamnit. He found a way to tweak the fuel pressure and run full timing and he runs 87 octane and that beast of his that runs low 12's threatening the 11.99 barrier [worship]

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Posts: 4003 | From: San Bruno | Registered: Aug 2002  |  :


 
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