Re: 100 octane gas?
[Re: bobs69]
#2719479
11/26/19 02:33 PM
11/26/19 02:33 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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Posts: 19,317
State of confusion
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I've been running VP-100 and 101 at 12.1.1 comp. in the 9's for many years............The new 101 is called HP-101 and is no longer street legal but VP sez it's good to 14 to 1 iirc w/alum. heads and 12 to 1 w/iron......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 100 octane gas?
[Re: bobs69]
#2719485
11/26/19 02:58 PM
11/26/19 02:58 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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How much compression can you run with 100 octane gas? 1. It depends 2. Check w/ the fuel blender of your choice to see what their suggested guidelines and/or applications are for whatever they have you're considering using There's simply no cut-n-dry answer to your question.
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Re: 100 octane gas?
[Re: oldiron]
#2719548
11/26/19 08:01 PM
11/26/19 08:01 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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Same here and it went up to $84 a pail so I'm going to 110 leaded and 91 at a 50/50 mix and will see how it runs, how the plugs look and the afr's.....
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 100 octane gas?
[Re: bobs69]
#2719638
11/27/19 04:14 AM
11/27/19 04:14 AM
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Joined: Aug 2005
Posts: 5,999 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 5,999
Salem
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Agree with Thumperdart at 12:1 I'm at 10.5:1 all day, any weather, any RPM at 92 on an open chamber J head. Aluminum head and quench, I'd go over 13:1 with 100 octane without even questioning it.
Mo' Farts
Moderated by "tbagger".
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Re: 100 octane gas?
[Re: mopar dave]
#2719787
11/27/19 03:52 PM
11/27/19 03:52 PM
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Joined: Oct 2003
Posts: 11,684 W. Kentucky
justinp61
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I Live Here
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I think most over octane their motors. I don't plan on running much more then 98-101 octane with 12.5:1. I will be mixing like Dom to keep it somewhat economical. My 434" SB was built for pump 93 and is 11.2-1. When we dynode it I took 5 gallons of pump 93 and 5 gallons of crate 98 race gas. With no changes to the engine it made 30 hp more on the 93 than the 98. The afr and timing were optimized for the 98 before we tried the 93. I've tried unleaded 110 and it doesn't like it either. I called VP last year and asked for a fuel recommendation for my combo, to my surprise they recommended MS109 oxygenated unleaded. I bought 5 gallons but ended up burning it in my SXS as my Dart didn't like it.
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Re: 100 octane gas?
[Re: mopar dave]
#2719821
11/27/19 05:46 PM
11/27/19 05:46 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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There is more to fuel than octane rating. The burn rate is equally important. If you are buying a fuel that has a slower burn rate than pump gas, and you need the quicker burn rate of pump gas it will slow down for sure.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 100 octane gas?
[Re: MR_P_BODY]
#2719824
11/27/19 05:54 PM
11/27/19 05:54 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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How much compression can you run with 100 octane gas? Its more about where your cam is installed(advanced or retarted) So where your cam is installed is more important than combustion chamber design, bore size, quench area %, quench distance, ignition timing... ?
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Re: 100 octane gas?
[Re: madscientist]
#2719837
11/27/19 06:35 PM
11/27/19 06:35 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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Any why I add timing when running leaded race gas to help speed the burn............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 100 octane gas?
[Re: mopar dave]
#2719851
11/27/19 08:02 PM
11/27/19 08:02 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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I Live Here
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I have a customer that runs a Pettis 572 BB Chevy in a 3430lb stock suspension Chevelle that runs on 94 from the pump and has gone a best of a 1.22 60 ft and 8.84 at 150+ so far w/a 1250 2-circuit I built him. He tried av gas and it went slower but no full on race gas yet so maybe next year and I'll report the results......
Last edited by Thumperdart; 11/28/19 01:43 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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