Streetable Compression Ratio

80Cobra306 · October 29th, 2009, 01:31 PM

what is the highest comp ratio i could go on the streets withouthaving detonation problems. i know if i went high i could keep to a mild timing and run colder plugs. anyone runnin high comp? when i figured up the comp on my new motor it ends up being close to 11-1, dont really want to run race gas but willing to mix i guess. anyone use octane boost? almost seems like a hoax to me. please advise.
thanks

M L Struck · October 29th, 2009, 02:50 PM

I run 11:1 on my street motor and I run 93 oct. and 2 gals of cam2 purple or what ever I have a drum of.

ryans88gt · October 29th, 2009, 02:54 PM

on 93 octane, 12:1 should be manageable, but it is going to really depend on the motor. Aluminum heads help a bit as they dont get the same hot spots iron heads do...

ReverendDexter · October 29th, 2009, 02:59 PM

My understanding is that aluminum heads allow for "1 more" in terms of your CR, i.e. if with iron heads you can do 9.5:1, aluminum would allow for 10.5:1.

I don't hear much in the way of anything past 10.5:1 that uses pump gas, but in california all we can get is 91 without going to a racetrack and paying $6/gallon.

80Cobra306 · November 5th, 2009, 02:15 PM

thanks guys, i'll see what happens, wish i had the money for a set of aluminums right now but i'll make due. the purple cam 2 is the lowest grade right? how many gallons does your tank or cell hold

80Cobra306 · November 5th, 2009, 02:20 PM

also i would imagine you guys are running ignition boxes. im lookin at the 6 digital. the price isnt too bad. and it seems to have great features and all the features that i want. seems like a better deal than buyin a 6 al and then a retard box

jessemachone · November 5th, 2009, 08:51 PM

Sweet info, I was just wondering about this myself.

October 29th, 2009, 01:31 PM	#1
80Cobra306 Regular Join Date: Aug 2009 Posts: 63 iTrader: 0 reviews	Streetable Compression Ratio what is the highest comp ratio i could go on the streets withouthaving detonation problems. i know if i went high i could keep to a mild timing and run colder plugs. anyone runnin high comp? when i figured up the comp on my new motor it ends up being close to 11-1, dont really want to run race gas but willing to mix i guess. anyone use octane boost? almost seems like a hoax to me. please advise. thanks __________________ 1980 Mustang Cobra 306,H,C,I, full exhaust,

October 29th, 2009, 02:50 PM	#2
M L Struck Hardcore Enthusiast 85 GT/86 SVO/2010 GT500 Join Date: Oct 2008 Location: Rossville IN Posts: 1,183 iTrader: 0 reviews	I run 11:1 on my street motor and I run 93 oct. and 2 gals of cam2 purple or what ever I have a drum of. __________________ "Having a 9 second neon is like coming out of the closet, everyone is shocked at first, but in the end you're still gay." 5.4 Shelby Crew member #1

October 29th, 2009, 02:54 PM	#3
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,627 iTrader: 0 reviews	on 93 octane, 12:1 should be manageable, but it is going to really depend on the motor. Aluminum heads help a bit as they dont get the same hot spots iron heads do... __________________ 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

October 29th, 2009, 02:59 PM	#4
ReverendDexter Priest of the Car Gods Clapped-out '90 GT 'vert ~5.5 seconds off TTOD :( Join Date: Jan 2007 Location: Rohnert Park, CA Posts: 13,233 iTrader: 0 reviews	My understanding is that aluminum heads allow for "1 more" in terms of your CR, i.e. if with iron heads you can do 9.5:1, aluminum would allow for 10.5:1. I don't hear much in the way of anything past 10.5:1 that uses pump gas, but in california all we can get is 91 without going to a racetrack and paying $6/gallon. __________________ O o /¯/______________________ \|BLAAAAAAAAAAAAAAAAAAAAAAAAARGH!!! \_\ Buy my Bronco, special deal for MM folks

November 5th, 2009, 02:15 PM	#5
80Cobra306 Regular Join Date: Aug 2009 Posts: 63 iTrader: 0 reviews	thanks guys, i'll see what happens, wish i had the money for a set of aluminums right now but i'll make due. the purple cam 2 is the lowest grade right? how many gallons does your tank or cell hold __________________ 1980 Mustang Cobra 306,H,C,I, full exhaust,

November 5th, 2009, 02:20 PM	#6
80Cobra306 Regular Join Date: Aug 2009 Posts: 63 iTrader: 0 reviews	also i would imagine you guys are running ignition boxes. im lookin at the 6 digital. the price isnt too bad. and it seems to have great features and all the features that i want. seems like a better deal than buyin a 6 al and then a retard box __________________ 1980 Mustang Cobra 306,H,C,I, full exhaust,

November 5th, 2009, 08:51 PM	#7
jessemachone The Big Spoon 88 5.0 5 Speed Notch <>< never fast enough Join Date: Mar 2008 Location: PHL -> PHX Posts: 2,999 iTrader: 0 reviews	Sweet info, I was just wondering about this myself.

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