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What octane really needed ? #962628
03/30/11 08:39 PM 03/30/11 08:39 PM
Joined: Oct 2010
Posts: 126
Nevada
T
theman440 Offline OP
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theman440  Offline OP
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Posts: 126
Nevada
11.1 CR w/aluminum head (track only car)
Re: What octane really needed ? [Re: theman440] #962629
03/30/11 09:51 PM 03/30/11 09:51 PM
Joined: Nov 2004
Posts: 7,274
s.w.fl
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bonefish Offline
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id say 110 is more than good,mabey even 93 pump gas.

Re: What octane really needed ? [Re: theman440] #962630
03/30/11 10:18 PM 03/30/11 10:18 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

11.1 CR w/aluminum head (track only car)



Whats the cam... when the intake closes it starts the
compression cycle
Re: What octane really needed ? [Re: MR_P_BODY] #962631
03/30/11 10:48 PM 03/30/11 10:48 PM

A
Anonymous
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50/50 with 110 and sunoco 93 will be perfect.
Re: What octane really needed ? #962632
03/31/11 01:04 AM 03/31/11 01:04 AM
Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon Offline
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Jeepmon  Offline
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Sunnyvale, CA
In my 73 small block stroker.. 11:1 with Aluminum heads.. its 91 octane for the street.. 98-100-104 at the track...

260=ish duration, 108 LSA, 36 degrees timing, all in at 3000 rpm..

73 Duster 360 stroker
http://www.cardomain.com/ride/2594657
Re: What octane really needed ? [Re: theman440] #962633
03/31/11 02:28 AM 03/31/11 02:28 AM
Joined: Mar 2008
Posts: 883
Affton MO
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qwkmopardan Offline
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Affton MO
mix 4 gallons of 93 with 1 gallon of 110.
Re: What octane really needed ? [Re: qwkmopardan] #962634
03/31/11 03:12 AM 03/31/11 03:12 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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I dont know how you guys can suggest a certain octane
without knowing when the intake closes... hell if the
intake closes with the piston half way up the cylinder
he could pee in the tank and it would be fine....JMO
Re: What octane really needed ? [Re: MR_P_BODY] #962635
03/31/11 03:17 AM 03/31/11 03:17 AM
Joined: Jan 2003
Posts: 27,421
Balt. Md
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383man Offline
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Quote:

I dont know how you guys can suggest a certain octane
without knowing when the intake closes... hell if the
intake closes with the piston half way up the cylinder
he could pee in the tank and it would be fine....JMO




Ron
Re: What octane really needed ? [Re: MR_P_BODY] #962636
03/31/11 04:11 AM 03/31/11 04:11 AM
Joined: Mar 2008
Posts: 883
Affton MO
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qwkmopardan Offline
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Affton MO
Quote:

I dont know how you guys can suggest a certain octane
without knowing when the intake closes... hell if the
intake closes with the piston half way up the cylinder
he could pee in the tank and it would be fine....JMO




A new grade of gas. pee85. He offered little info and what he told us: 11 to 1, aluminum heads and track only. You can bet it has a long dur. cam and intake is'nt closed 20deg A.B.C. It will probably run fine on 93 oct. but being at the track and 110 gas will be avail I suggest adding 20% 110 to be sure. If it detonates and pushes out the head gaskets try higher octane next time.
Re: What octane really needed ? [Re: qwkmopardan] #962637
03/31/11 09:44 AM 03/31/11 09:44 AM
Joined: Jan 2003
Posts: 21,074
Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
therocks  Offline
oh wait.but hey.lets see.oh yeah.
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Niles , Ohio
I run 93 on the street in my 440 with 12.5 domes and aluminum heads.Just cant really lay into it or it gets ping.If I mix 110 at about 50/50 its perfect.At the track I run mostly 110.Rocky

Chrysler Firepower
Re: What octane really needed ? [Re: qwkmopardan] #962638
03/31/11 10:20 AM 03/31/11 10:20 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
The reason I said is I use to run 112 and dropped down
the octane and picked up ET... just by lowering the
octane... nothing else... and my cam is big duration
but a wide LSA
Re: What octane really needed ? [Re: MR_P_BODY] #962639
03/31/11 11:30 AM 03/31/11 11:30 AM
Joined: Jan 2007
Posts: 3,695
nc
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emarine01 Offline
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Quote:

I dont know how you guys can suggest a certain octane
without knowing when the intake closes... hell if the
intake closes with the piston half way up the cylinder
he could pee in the tank and it would be fine....JMO


A Mod with humor Anyhow... ya gota know where your intake closes to answer your question otherwise its like Mike said

Re: What octane really needed ? [Re: MR_P_BODY] #962640
03/31/11 11:35 AM 03/31/11 11:35 AM
Joined: Oct 2003
Posts: 7,506
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Crizila Offline
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Quote:

I dont know how you guys can suggest a certain octane
without knowing when the intake closes... hell if the
intake closes with the piston half way up the cylinder
he could pee in the tank and it would be fine....JMO


and thats not the only consideration, although pretty high on the list.

Fastest 300
Re: What octane really needed ? [Re: emarine01] #962641
03/31/11 11:38 AM 03/31/11 11:38 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Posts: 52,972
Romeo MI
A Mod with humor Anyhow... ya gota know where your intake closes to answer your question otherwise its like Mike said



EX-mod

Re: What octane really needed ? [Re: MR_P_BODY] #962642
03/31/11 12:22 PM 03/31/11 12:22 PM
Joined: Jan 2007
Posts: 3,695
nc
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emarine01 Offline
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Quote:

A Mod with humor Anyhow... ya gota know where your intake closes to answer your question otherwise its like Mike said



EX-mod


Well that would explain the humor Oh... if ya dont know your cam specs, compression test and post the results

Last edited by emarine01; 03/31/11 12:24 PM.
Re: What octane really needed ? [Re: qwkmopardan] #962643
03/31/11 04:46 PM 03/31/11 04:46 PM
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340 Offline
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Quote:

mix 4 gallons of 93 with 1 gallon of 110.

thats what i do.

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