Max Compression

Goblin · April 2nd, 2008, 03:59 PM

Hey guys, quick question. What would theoretically be the highest safe compression limit for 105 octane? (E85) Im getting mixed reviews and feedback. I know C12 can handle 12:1+, and it has a motor octane rating of 108, but thats leaded race gas. Any ideas?

ryans88gt · April 2nd, 2008, 04:10 PM

my guess is 11:1 to 12:1. Maybe more if you can keep up with the fuel demands.

Goblin · April 2nd, 2008, 04:17 PM

Thats what i was thinking. As long as i can keep up with fuel delivery i should be able to get away with something close to 12:1.

ryans88gt · April 2nd, 2008, 04:32 PM

Originally Posted by Goblin

Thats what i was thinking. As long as i can keep up with fuel delivery i should be able to get away with something close to 12:1.

I'm running 11:1 on 93 octane in my clevor...so I would guess you would be fine with 12:1. Still planning??

Goblin · April 2nd, 2008, 05:30 PM

Yeah, im actually almost done planning. Ive already started ordering parts.

Im just trying to figure out what type of piston im going to use with my heads. If i can run 12:1 with E85, thats the direction im going. Theres about 4-5 E85 stations in Tucson, AZ alone... and im headed there tomorrow. Im having some fun right now with the 5 liter (yeah, i got another car and didnt tell anyone), but look for a 400+ inch N/A build up in the next few months.

Goblin · April 3rd, 2008, 01:21 PM

Still curious. Anyone else have any info to donate?

ryans88gt · April 3rd, 2008, 01:31 PM

Maybe try asking on turbomustangs.com

I think there are a few guys there running E85 on their turbo cars.

acmillr · April 3rd, 2008, 01:36 PM

Originally Posted by Goblin

Yeah, im actually almost done planning. Ive already started ordering parts.

Im just trying to figure out what type of piston im going to use with my heads. If i can run 12:1 with E85, thats the direction im going. Theres about 4-5 E85 stations in Tucson, AZ alone... and im headed there tomorrow. Im having some fun right now with the 5 liter (yeah, i got another car and didnt tell anyone), but look for a 400+ inch N/A build up in the next few months.

Are you moving or just visiting? I have been buying 110 leaded from Eastbay in Riverview lately.

Goblin · April 3rd, 2008, 01:52 PM

Hard to explain. I'll be there for quite some time, but not indefinately. I'll be back to FL eventually.

Ryan >

Thanks for the tip, i completely forgot about TM.com.

April 2nd, 2008, 03:59 PM	#1
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Max Compression Hey guys, quick question. What would theoretically be the highest safe compression limit for 105 octane? (E85) Im getting mixed reviews and feedback. I know C12 can handle 12:1+, and it has a motor octane rating of 108, but thats leaded race gas. Any ideas? __________________

April 2nd, 2008, 04:10 PM	#2
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	my guess is 11:1 to 12:1. Maybe more if you can keep up with the fuel demands. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

April 2nd, 2008, 04:17 PM	#3
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Thats what i was thinking. As long as i can keep up with fuel delivery i should be able to get away with something close to 12:1. __________________

April 2nd, 2008, 05:30 PM	#5
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Yeah, im actually almost done planning. Ive already started ordering parts. Im just trying to figure out what type of piston im going to use with my heads. If i can run 12:1 with E85, thats the direction im going. Theres about 4-5 E85 stations in Tucson, AZ alone... and im headed there tomorrow. Im having some fun right now with the 5 liter (yeah, i got another car and didnt tell anyone), but look for a 400+ inch N/A build up in the next few months. __________________

April 3rd, 2008, 01:21 PM	#6
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Still curious. Anyone else have any info to donate? __________________

April 3rd, 2008, 01:31 PM	#7
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	Maybe try asking on turbomustangs.com I think there are a few guys there running E85 on their turbo cars. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

April 3rd, 2008, 01:52 PM	#9
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Hard to explain. I'll be there for quite some time, but not indefinately. I'll be back to FL eventually. Ryan > Thanks for the tip, i completely forgot about TM.com. __________________

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