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Old 06-16-17, 12:19AM   #31
Dragncar
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Shrink that gasket to get me 11.75 and we are in business.
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Old 06-16-17, 01:34AM   #32
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23 cc dish and .050 head gasket will get you 11.73
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Old 06-16-17, 11:54AM   #33
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On Long Island E85 is big because there are a lot of stations with it. $1.70 per gallon right now. you could run more compression then.
I would either lower compression not to be on the edge, or raise it and go E85.
Depends on how much street driving you are going to do. just my .02
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Old 06-16-17, 12:16PM   #34
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I assume you'll be spiking the pump gas with race gas at the track with that 11.75 compression?
You've had allot of experience running pump gas, what was the cut off point on compression for you.

What was the most compression you ran on pump gas. ?
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Old 06-16-17, 06:11PM   #35
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I assume you'll be spiking the pump gas with race gas at the track with that 11.75 compression?
Dont plan on it, unless Scot Brown tells me to. Gach ran just over 12-1 with this cam. I run 91, hence the 11.75
I can find out the answer on the dyno. Make a pull with race spiked gas. And when I run 91 the power should be at least the same or a tiny bit more.
I am going to do whatever Marcella and Scott Brown recommend.
John is the reason I chose the 4.5 Scat crank and Callies Ultra rods.
They are the folks behind Mike Leechs program.
More than good enough for me.
They are the folks behind BADDTAs sons crazy little pump gas engine. Another success.
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Old 06-19-17, 12:03AM   #36
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I've been running 93 at 12:1 in my street car for the last several years. Both racing and street driving. Rod bearings look fine.
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Old 06-19-17, 12:21AM   #37
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I've been running 93 at 12:1 in my street car for the last several years. Both racing and street driving. Rod bearings look fine.
Holy Chit that is awesome. Fuel injection or carb?
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Old 06-19-17, 01:11AM   #38
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Brad,what does those engine pump hot?Tom
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Old 06-19-17, 01:51AM   #39
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I've been running 93 at 12:1 in my street car for the last several years. Both racing and street driving. Rod bearings look fine.
I don't think many believe me, on not having any denation problems on my 12.1 compression motor.

Definitely couldn't get away with it with iron heads, aluminum heads require a minimum of 1 point more in compression to equal same compression as a iron head. I'm thinking 2 points more compression isn't a problem. Specially with today's gas that has 10% ethanol/alcohol 93 octane
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Old 06-19-17, 02:02AM   #40
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The other thing I think helps is the chambers... for the life of me I can't remember the ( terminology ) used...is the heads chambers were massaged for running nitrous. I'm guessing removing any sharp edges.
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Old 06-19-17, 12:40PM   #41
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So you think a chamber setup for heavy loads of nitrous is good for power in a na engine?
It's what I had to deal with, wasn't something I did by choice. Comparing nitrous chambers to my old set, I couldn't really see much difference in the chambers. If I was starting fresh would I have it done...nope.
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Old 06-19-17, 09:57PM   #42
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Have you ever tested higher octane fuel, either on the dyno or track to see what the outcome would be?
I have. But I only have 11.4:1. I ran half the day on 93 till my full tank got down to 1/4 . Then filled it with 110. Times went from 10.20 to 10.50's

E heads ran the fastest at 34 degrees of timing...
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Old 06-19-17, 11:25PM   #43
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Quite a drop in ET
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Old 06-20-17, 12:08AM   #44
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That combo the cam was 242 254 580 lift heads flowed 333intake 251 exhaust. So probably around 625 hp.
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Old 06-20-17, 03:25AM   #45
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How much power?

Does anyone think that VE% plays into an engines octane tolerance? For example, the higher the ve% for a given compression ratio makes an engine more or less tolerant to octane requirements? Or is there no correlation between the two?
Interesting thought, don't know the answer. But I'll bet it does
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