Octane

Fastback91 · November 13th, 2007, 02:32 AM

ya just curious but all of u guys that have 351's or higher do u guys use a higher octane cause my dads 69 Camaro 307(1st owner *ORignal*) like the 289 (small block) has to take 91 octane cause of the way it was set up in the 60's

69fastback · November 13th, 2007, 02:43 AM

A stock 289 doesn't need high octane. If it hasn't had hardened seats put in, it will need lead additive though. I run 87 in my 351W all the time. Unless you're 10.5:1, you don't need anything higher than 87, unless you're planning on running a lot of timing.

Horseshoeing · November 13th, 2007, 08:31 AM

I have a 289 and I have to run 92 or better. I am running about 11 to 1. Its not about how big you motor is, but how much compression you are running.

Fastback91 · November 14th, 2007, 12:48 AM

ya thats what i thought just like all the bigger blocks back then had such a high compression ratio

Horseshoeing · November 14th, 2007, 08:29 AM

Compression=more horses

460brevill · November 14th, 2007, 09:19 AM

10.5 comp. in my i6.it want run worth doodles on anything lower than 93 oct.

Vinyl66 · November 14th, 2007, 09:49 AM

anyone know what compression i am running in my 302 w/ 289 heads? ive heard both 9.5:1 and 10.5:1

69fastback · November 14th, 2007, 06:37 PM

Originally Posted by Vinyl66

anyone know what compression i am running in my 302 w/ 289 heads? ive heard both 9.5:1 and 10.5:1

There are way too many factors involved or someone to give an accurate number. If anybody has decked the block or heads, it'll change it dramatically. If it's been rebuilt, it could be changed because of the pistons, and there are other factors as well.

jspagna1 · November 14th, 2007, 08:03 PM

I run 1/2 93 octane and 1/2 Cam2.

TurboLX · November 14th, 2007, 08:17 PM

107 octane here

69fastback · November 14th, 2007, 10:13 PM

I ran 110 in my camaro. It was 13.5:1

cgstarry · November 19th, 2007, 11:46 PM

I read recently that back in the 60's regular unleaded gas was 92 octane. So they way I am looking at it my i6 was designed for high octane fuel, so high octane fuel it shall have!

John

Horseshoeing · November 20th, 2007, 08:22 PM

All you have to do is retime it to run 87.

OldSchool · November 21st, 2007, 09:11 AM

Originally Posted by cgstarry

I read recently that back in the 60's regular unleaded gas was 92 octane. So they way I am looking at it my i6 was designed for high octane fuel, so high octane fuel it shall have!

John

They didn't have regular unleaded until 1973. The end of the "classic" cars.
I seriously doubt you require high octane in a I6, unless you have money to burn.

zers · November 21st, 2007, 01:03 PM

What about ethanol? Any of you guys use that?

It's supposadly an easy conversion, and it's 100+ octane.

Anybody done the conversion?

TurboLX · November 21st, 2007, 01:07 PM

E85, most drag racers use it now

built351w · November 22nd, 2007, 01:58 PM

Oh yeah well I run pure nitroglycerin!!!!! lol figured since all you guys were bragging about your octane numbers I'd just settle it one and for all....

I don't think anybody has mentioned ignition yet. Having a stock ignition vs full MSD set up changes the compression rating you can get away with. I have 10.5:1 on my 351w with cast heads and full MSD ignition, my machine shop guy told me that's the highest you can get away with and run pump gas, the good stuff Sunoco ultra 93....

460brevill · November 23rd, 2007, 11:01 AM

the early I6 was around 8 1/2 to 9 to 1 comp.they didnt require high oct.my I6 is 10 1/2 to 1 and i run the sonoco 93 too.one reason is they dont run all there gas through the same hose.

69fastback · November 25th, 2007, 08:48 PM

It's all about compression and timing....nothing else. It doesn't matter when the car was made. If it's high compression, you can back the timing off, and run lower octane.

If you want a little more more power, you can run a higher octane, and put a little more timing in it.

November 13th, 2007, 02:32 AM	#1
Fastback91 Hardcore Enthusiast 2008 Black Bullitt Sylv Rivial :P Join Date: Aug 2007 Location: California Posts: 1,392 iTrader: 0 reviews	Octane ya just curious but all of u guys that have 351's or higher do u guys use a higher octane cause my dads 69 Camaro 307(1st owner ORignal) like the 289 (small block) has to take 91 octane cause of the way it was set up in the 60's

November 13th, 2007, 02:43 AM	#2
69fastback Premium Member 1969 Mustang Mach 1 7.324@94.61 N/A Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 4,540 iTrader: 0 reviews	A stock 289 doesn't need high octane. If it hasn't had hardened seats put in, it will need lead additive though. I run 87 in my 351W all the time. Unless you're 10.5:1, you don't need anything higher than 87, unless you're planning on running a lot of timing. __________________ ProSystems Aeromotive TFS MSD Bullet Induction Solutions PA Moser

November 13th, 2007, 08:31 AM	#3
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,177 iTrader: 0 reviews	I have a 289 and I have to run 92 or better. I am running about 11 to 1. Its not about how big you motor is, but how much compression you are running. __________________ Classic Mustangs are the best! Get one.

November 14th, 2007, 08:29 AM	#5
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,177 iTrader: 0 reviews	Compression=more horses __________________ Classic Mustangs are the best! Get one.

November 14th, 2007, 09:19 AM	#6
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	10.5 comp. in my i6.it want run worth doodles on anything lower than 93 oct. __________________ i sixing 200 six with 300 hp.

November 14th, 2007, 12:48 AM	#4
Fastback91 Hardcore Enthusiast 2008 Black Bullitt Sylv Rivial :P Join Date: Aug 2007 Location: California Posts: 1,392 iTrader: 0 reviews	ya thats what i thought just like all the bigger blocks back then had such a high compression ratio

November 14th, 2007, 09:49 AM	#7
Vinyl66 Anatidaephobic 1966 Vinyl Mustang 2012 Hyundai Elantra GLS Join Date: Sep 2007 Posts: 2,353 iTrader: 0 reviews	anyone know what compression i am running in my 302 w/ 289 heads? ive heard both 9.5:1 and 10.5:1 __________________ Pittsburgh Steelers/Penguins/Pirates FTMFW!!!!!

November 14th, 2007, 08:03 PM	#9
jspagna1 Regular Join Date: Nov 2007 Location: Connecticut Posts: 58 iTrader: 0 reviews	I run 1/2 93 octane and 1/2 Cam2.

November 14th, 2007, 08:17 PM	#10
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,792 Blog Entries: 1 iTrader: 0 reviews	107 octane here __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

November 14th, 2007, 10:13 PM	#11
69fastback Premium Member 1969 Mustang Mach 1 7.324@94.61 N/A Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 4,540 iTrader: 0 reviews	I ran 110 in my camaro. It was 13.5:1 __________________ ProSystems Aeromotive TFS MSD Bullet Induction Solutions PA Moser

November 19th, 2007, 11:46 PM	#12
cgstarry Regular 2007 Mustang GT, 66 Coupe Join Date: May 2007 Location: Minneapolis, MN Posts: 125 iTrader: 0 reviews	I read recently that back in the 60's regular unleaded gas was 92 octane. So they way I am looking at it my i6 was designed for high octane fuel, so high octane fuel it shall have! John __________________ Vista Blue 2007 Mustang GT Premium Coupe 5 Speed FRPP GTA Axelbacks, AMSOIL XL 5W-20 Steeda CAI w/ High Flow Elbow, SCT xCalibrator 2

November 20th, 2007, 08:22 PM	#13
Horseshoeing Classic Moderator Join Date: Aug 2005 Location: GA Posts: 4,177 iTrader: 0 reviews	All you have to do is retime it to run 87. __________________ Classic Mustangs are the best! Get one.

November 21st, 2007, 01:03 PM	#15
zers Regular 1965 Coupe Join Date: Oct 2007 Location: Oregon Posts: 356 iTrader: 0 reviews	What about ethanol? Any of you guys use that? It's supposadly an easy conversion, and it's 100+ octane. Anybody done the conversion? __________________

November 21st, 2007, 01:07 PM	#16
TurboLX I Post Entirely Way Too Much 1988 Mustang LX Turbo Join Date: Oct 2006 Location: NY Posts: 8,792 Blog Entries: 1 iTrader: 0 reviews	E85, most drag racers use it now __________________ 1988 LX Coupe 2.5L, GT35R, 44mm WG, 32psi, C16.

November 22nd, 2007, 01:58 PM	#17
built351w Regular 1979 mustang 5.0 hopefully 11's when complete Join Date: Jul 2007 Location: New Hampshire Posts: 201 iTrader: 0 reviews	Oh yeah well I run pure nitroglycerin!!!!! lol figured since all you guys were bragging about your octane numbers I'd just settle it one and for all.... I don't think anybody has mentioned ignition yet. Having a stock ignition vs full MSD set up changes the compression rating you can get away with. I have 10.5:1 on my 351w with cast heads and full MSD ignition, my machine shop guy told me that's the highest you can get away with and run pump gas, the good stuff Sunoco ultra 93....

November 23rd, 2007, 11:01 AM	#18
460brevill Hardcore Enthusiast Join Date: Apr 2007 Location: Farmville VA Posts: 1,327 iTrader: 0 reviews	the early I6 was around 8 1/2 to 9 to 1 comp.they didnt require high oct.my I6 is 10 1/2 to 1 and i run the sonoco 93 too.one reason is they dont run all there gas through the same hose. __________________ i sixing 200 six with 300 hp.

November 25th, 2007, 08:48 PM	#19
69fastback Premium Member 1969 Mustang Mach 1 7.324@94.61 N/A Join Date: Aug 2006 Location: Oklahoma jackass, get to driving Posts: 4,540 iTrader: 0 reviews	It's all about compression and timing....nothing else. It doesn't matter when the car was made. If it's high compression, you can back the timing off, and run lower octane. If you want a little more more power, you can run a higher octane, and put a little more timing in it. __________________ ProSystems Aeromotive TFS MSD Bullet Induction Solutions PA Moser

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