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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
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Octane requirements for nitrous and high SCR?
New build is a 434 with ported 670 iron heads at 9.8:1 compression. Lunati 231/239/110 on 104.5 ICL. With an intake valve closing of 65.5* ABDC, the DCR should be about 7.8:1.
What octane fuel should be used with a 150 shot of nitrous? Single stage plate under a Q-jet on RPM intake.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
#2
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Hmm, I sense some hesitation to answer this one. So let me ask another way: Can I run a 150 shot on 93 octane pump gas, or do I need straight VP110 LL?
OR, am I limited to a 100 HP shot on pump gas? Assume engine is sealed up well and tuned properly.
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
#3
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If it may help,
I ran a 9.5:1 412 250cfm 6X head with 230/236 110 ls installed at 106 hf cam on 92 octane. 150 shot and pulled 4 deg. Of timing without issue. |
#4
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I have a 461ci 11.3 to 1 pump gas (93 octane) motor with a 150 shot . But i have a separate fuel pump and cell with 108 that mixes with the 93 for the NOS. Works great.. Never tried it with straight 93. Id be skeptical just like you.
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My Half AN Injun..... |
#5
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I ran a 462 with 9.5 comp. and a 275 shot on 92 octane with 8* out and
no problems, I was using a separate pump just for the nitras. I've always run two pumps on my car for nitras. and always pulled 8* and haven't had a problem yet. Hope this helps. GT. |
#6
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I've run more comp. with this combo too.
GT. |
#7
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Blueghost, How big a cam were you running? Do you know the adv duration and LSA? Trying to compare intake closing event to what I have.
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
#8
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Quote:
GT. |
#9
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Quote:
I'll be in my garage tomorrow and get some of this info for ya, Sorry bout dat. GT. |
#10
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Sorry I will get it eventually for you.
GT. |
#11
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FWIW, my old Discomobile was pushing 11.5:1 CR with iron heads and I ran VP C-16 racing gas in it, spraying up to a 250-HP shot. No issues
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Just a blind squirrel looking for a nut. |
#12
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Good info guys, keep it coming.
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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