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What Octane Fuel for my 10.1 446 #223180 02/13/09 11:51 AM 02/13/09 11:51 AM
Joined: Jan 2003 Posts: 4,281 Danville, NH M Mopar_Mike OP master
Mopar_Mike OP master M Joined: Jan 2003 Posts: 4,281 Danville, NH	I have a 66 446 block with stock edelbrock heads and TRW 2255 six pack pistons. I am running 10.1 compression. For the street I will run 93 octane, but when I go to the strip will I benefit from the higher octane racing fuel? I think it is around 105-108 octane. Thanks. RS23L7 4-Speed

Re: What Octane Fuel for my 10.1 446 [Re: Mopar_Mike] #223181 02/13/09 11:58 AM 02/13/09 11:58 AM
Joined: Jul 2003 Posts: 977 Colorado 5 506RR super stock
506RR super stock 5 Joined: Jul 2003 Posts: 977 Colorado	Higher octane fuel burns slower, so if it is not needed then it will not benefit you. With 10:1 compression and aluminum heads I would think you would be fine with pump gas both at the strip and on the street. But, you could always do a test using both fuels and see if it makes a difference or not. That is the only way to know for sure.

Re: What Octane Fuel for my 10.1 446 [Re: Mopar_Mike] #223182 02/13/09 12:01 PM 02/13/09 12:01 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: I have a 66 446 block with stock edelbrock heads and TRW 2255 six pack pistons. I am running 10.1 compression. For the street I will run 93 octane, but when I go to the strip will I benefit from the higher octane racing fuel? I think it is around 105-108 octane. Thanks. Theres really no reason to up the octane unless you just plan on being safe. Also if you up the octane without adding some timing.... you would go slower. The cam makes a big difference in the cyl pressure... when it closes

Re: What Octane Fuel for my 10.1 446 [Re: Mopar_Mike] #223183 02/13/09 12:13 PM 02/13/09 12:13 PM
Joined: Jan 2003 Posts: 302 Casa Grande,Arizona D DennisJ super street
DennisJ super street D Joined: Jan 2003 Posts: 302 Casa Grande,Arizona	You should use the lowest octane that does not cause detonation. With Edelbrock heads you could use the middel grade at the pump.The aluminum head helps the detonation problem. Dennis Jokela I started out with nothing,and I still have most of it.

Re: What Octane Fuel for my 10.1 446 [Re: DennisJ] #223184 02/13/09 12:21 PM 02/13/09 12:21 PM
Joined: Jul 2004 Posts: 3,804 Arlington, Texas B bobby66 master
bobby66 master B Joined: Jul 2004 Posts: 3,804 Arlington, Texas	I use the same pistons and heads on my 446. Hydraulic cam 242@.050. Need a couple gallons of 110 at the track or it will rattle.

Re: What Octane Fuel for my 10.1 446 [Re: bobby66] #223185 02/13/09 12:45 PM 02/13/09 12:45 PM
Joined: Sep 2005 Posts: 1,328 St. Louis, MO mopardamo pro stock
mopardamo pro stock Joined: Sep 2005 Posts: 1,328 St. Louis, MO	Quote: I use the same pistons and heads on my 446. Hydraulic cam [Email]242@.050.[/Email] Need a couple gallons of 110 at the track or it will rattle. Hello, How old is the motor? Might have some oil contamination issues. I had the same problem when my last motor needed freshening. Damon

Re: What Octane Fuel for my 10.1 446 [Re: mopardamo] #223186 02/13/09 03:04 PM 02/13/09 03:04 PM
Joined: May 2005 Posts: 128 usa mrmopardan member
mrmopardan member Joined: May 2005 Posts: 128 usa	Same combo here too.. My Eng. rattled it's azz off. I found where my expensive Rotal Purple was going! 68 GTX Full street trim, solid lifter cammed. Best 11.34 @ 121 mph. 1.72 60 ft. (yeah I know.. my 60 ft. sucks)

Re: What Octane Fuel for my 10.1 446 [Re: mrmopardan] #223187 02/14/09 02:23 AM 02/14/09 02:23 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I run a 10.0 comp 446 in my 63 with the 906 iron heads. I use KB quench dome pistons and it has nice quench. It will run on 92 with no ping at all even with 38 total timing. And I drive to the track and race on 92 or 93 pump. Do you know if your 446 has good quench ?? Ron

Re: What Octane Fuel for my 10.1 446 [Re: 383man] #223188 02/14/09 02:53 AM 02/14/09 02:53 AM
Joined: Jan 2003 Posts: 3,616 Riverside, Ca G G_bob master
G_bob master G Joined: Jan 2003 Posts: 3,616 Riverside, Ca	The 446 in the challenger has the trw sixpack pistons at zero deck, eddie closed chamber heads, .039 gasket, 484 purpleshaft cam. Its 10.2:1. Runs fine on our 91 octane pump swill.

Re: What Octane Fuel for my 10.1 446 [Re: Mopar_Mike] #223189 02/14/09 11:14 PM 02/14/09 11:14 PM
Joined: Jan 2003 Posts: 16,923 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,923 NC	Mike, If your cam is at least 235 degrees at 0.050", I think you should be fine with 92-93 octane all the time. If the distributor has the vacuum advance, you might need to either get it tuned, or plug the vacuum connection.

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