VP C-12
#3062499
07/25/22 04:38 PM
07/25/22 04:38 PM
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Joined: Jan 2003
Posts: 1,607 westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,607
westerly, ri. usa
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is to much octane to much? 400, stk 452 heads t/quad stock intake, headers, 4:56 gears 4100 lbs
all parts are sold as is, all parts are considered used no warranties or returns paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred site is not monitored 24/7 there might be a delay in response
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Re: VP C-12
[Re: 440lebaron]
#3062512
07/25/22 05:30 PM
07/25/22 05:30 PM
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Joined: Mar 2010
Posts: 1,061 Atlanta, GA
mgoblue9798
super stock
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super stock
Joined: Mar 2010
Posts: 1,061
Atlanta, GA
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You need to optimize dynamic compression, valve timing events, and ignition timing for a certain octane level -plus a little margin for safety. Any fuel with octane rating exceeding what the build is designed for is just wasted money.
Last edited by mgoblue9798; 07/25/22 05:32 PM.
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Re: VP C-12
[Re: slantzilla]
#3062547
07/25/22 06:57 PM
07/25/22 06:57 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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In nhra stock, you have to run a fuel that’s on the approved list, and it will get checked after you make a pass most of the time.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: VP C-12
[Re: fast68plymouth]
#3062577
07/25/22 09:19 PM
07/25/22 09:19 PM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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In nhra stock, you have to run a fuel that’s on the approved list, and it will get checked after you make a pass most of the time. how long ago did that start?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: VP C-12
[Re: FastmOp]
#3062609
07/26/22 07:18 AM
07/26/22 07:18 AM
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Joined: Jan 2003
Posts: 1,607 westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,607
westerly, ri. usa
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no fuel check yet, 8-1 compression
all parts are sold as is, all parts are considered used no warranties or returns paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred site is not monitored 24/7 there might be a delay in response
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Re: VP C-12
[Re: 440lebaron]
#3062628
07/26/22 09:26 AM
07/26/22 09:26 AM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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That'll run good on 87 prob, back in the day running my 440-6@9.8:1 with single 850DP I ran what we called 4 star leaded fuel, approx 97 octane, decided to add unleaded to it, and boy it sounded so much stronger, didn't go much faster but.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: VP C-12
[Re: rb446]
#3062633
07/26/22 10:01 AM
07/26/22 10:01 AM
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Joined: Jan 2003
Posts: 1,607 westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,607
westerly, ri. usa
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YEP, no pump gas in stock, running in super street SST to break in car, illegal 383 still waiting for piston for 400
all parts are sold as is, all parts are considered used no warranties or returns paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred site is not monitored 24/7 there might be a delay in response
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Re: VP C-12
[Re: 440lebaron]
#3062639
07/26/22 10:10 AM
07/26/22 10:10 AM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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“If it were me”, and I were running an 8:1 motor in Stock, I’d initially be using whatever was the least expensive legal fuel on the list.
After the car was sorted out and quite repeatable......... then you could experiment with some different fuels to see if there is a performance gain over the cheaper stuff.
Of course, I wouldn’t be messing around in S/St either. Just put the 383 in the car, with the correct cam, heads, intake, carb and start making runs. Swap the short block when the new 400 is ready.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: VP C-12
[Re: 83hurstguy]
#3062643
07/26/22 10:17 AM
07/26/22 10:17 AM
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Joined: May 2019
Posts: 713 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 713
Lake Villa Il
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Octane and the burn curve aren't necessarily related. High compression engines need higher octane and also typically operate at higher RPM ranges, which requires a faster burn...
You'll find that fuels have varying Reid vapor pressures that will help with intake charge cooling more than others, which may help increase power via better atomization/distribution. A lot of stock eliminator guys will typically run C11 or C12, and those engines have less than 10:1 compression and huge cams that produce low cranking compression. Some fuels like hot vs cool engines (or hot intake charges from boost).
That being said, many people use race fuel for consistency in tuning run to run (or class rules) even if the engine doesn't require it. I have a big block iron headed engine here with 10.5:1 compression that doesn't care whether it's on pump or C12 (it actually picked up a tick on pump on the dyno). My stock 440-6 has some preferences that show up on the dyno in terms of fuel, but it's maybe 5 hp difference.
Pump gas is inconsistent but also oxygenated, which can help make power. You may also find that race fuel has lower specific gravity than the pump gas you're running, which means you need to jet up to get the same power input.
Overall - fuel testing and tuning takes a lot of time and effort. It's definitely not as simple as the guy at the cruise night spouting off "yeah she really runs good with the race gas!" Good post, agreed.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: VP C-12
[Re: Cab_Burge]
#3062652
07/26/22 10:39 AM
07/26/22 10:39 AM
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Joined: Feb 2016
Posts: 201 PA
Scully
enthusiast
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enthusiast
Joined: Feb 2016
Posts: 201
PA
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In nhra stock, you have to run a fuel that’s on the approved list, and it will get checked after you make a pass most of the time. how long ago did that start? More than 30 years ago.
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