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Re: NITROMETHANE Question
[Re: slantzilla]
#737195
07/01/10 09:29 AM
07/01/10 09:29 AM
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Joined: Aug 2006
Posts: 540
murfreesboro, TN
Qbird
mopar
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mopar
Joined: Aug 2006
Posts: 540
murfreesboro, TN
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Quote:
Price Fuels used to sell a nitro additive to put in gas cars. Buddy of mine used it in a SLant Aspen. It crushed the top ring lands on all 6 pistons. 
Just cause you can do something don't mean you should! Small amounts of nitro in gasoline will drop the octane level like a rock. There's no happy ending to something like that.
On the other hand, a Fuel-Slant is something I've thought about for years. I can't think of any other production engine with a geometry more perfect for burning high percentages of nitromethane than the 225. I think with good parts, 600 horsepower unblown would be a no brainer. I'm surprised nobody's ever built one.
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Re: NITROMETHANE Question
[Re: Cab_Burge]
#737196
07/01/10 09:45 AM
07/01/10 09:45 AM
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Joined: Aug 2004
Posts: 1,413
Newark,Ohio
kissmyaspen
pro stock
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pro stock
Joined: Aug 2004
Posts: 1,413
Newark,Ohio
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Quote:
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the oklahoma city bombing was 2 55 gallon drums of nitro.
 I don't think so, I have read the saga about about how much fertilzer (Amonia Nitrate) Timothy bought and how many different stores he bought it from and how much deisel fuel he soak into the fertilzer to make that truck bomb. Maybe some scribe related the energy from that truck bomb to two 55 gallons drums of nitro,  and which nitro where they talking about, Nitroglycerin or nitromethane?
Nitromethane, why do you think its a federal offence to be carring more than 55 gallons at a time. unless u have the right permit. VP transport the nitro for all the race teams track to track for this reason.
79 Dodge Aspen
12.265 at 109.75 MPH
67 Satellite NSS/E
11.83 @ 110
1968 Plymouth Road Runner 472 Hemi
3 time MOPAR NATIONALS CHAMP '03 FWD and '06 & '09 Street.
'07, '10, '12 Mopar Nats runner-up Street.
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Re: NITROMETHANE Question
[Re: Qbird]
#737197
07/01/10 11:23 AM
07/01/10 11:23 AM
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Joined: Oct 2007
Posts: 4,206
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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I can't think of any other production engine with a geometry more perfect
What geometry is that?
The 1.62 rod ratio is pretty common.
Boffin Emeritus
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Re: NITROMETHANE Question
[Re: polyspheric]
#737198
07/01/10 12:04 PM
07/01/10 12:04 PM
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Joined: Aug 2006
Posts: 540
murfreesboro, TN
Qbird
mopar
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mopar
Joined: Aug 2006
Posts: 540
murfreesboro, TN
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Quote:
I can't think of any other production engine with a geometry more perfect
What geometry is that?
The 1.62 rod ratio is pretty common.
I used the word geometry in a pretty broad sense there. The 1.62 rod ratio is absolutely perfect for a HAPPY nitro combination (piston speed..or more accurately piston acceleration and decelleration rates... vs flame travel @ (give or take) 6000 RPM. But, the small bore is key here too. The amount of ignition lead a fuel engine requires is dictated by a few factors, but most importantly bore diameter. A 3.4 inch bore will produce the same yield with just 30 degrees of lead as a 4.25 inch bore at around 65. This leaves that much more of the charge available to do work ATDC, with less likelihood of detonation.
The restrictive nature of the slant cylinder head can also work in favor of a happy fueler. Getting air into the chamber is not nearly as important in a nitro engine as it is with any other fuel. Nitro carries its own oxygen supply. Air needs to be coaxed in and out, where as raw, liquid fuel piled up behind the valve is going in no matter what. Same for the exhaust side. The valve opens, the pressure is going to be relieved, but a good amount of the unburned fuel will remain unavenged, and thus be ready to burn on the next cycle.
All of this is only valid when talking about a high percentage (90% and up) combination that is going to want things cold, wet and sloppy. Lower percentages (higher alcohol content) are going to see the same limitations as this particular engine has on gasoline or alcohol alone. The lower the percentage, the more the engine is reliant on atmosphere for efficient combustion.
BTW...noticed your name there...I'm a Poly freak myself.
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Re: NITROMETHANE Question
[Re: slantzilla]
#737200
07/01/10 06:20 PM
07/01/10 06:20 PM
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Joined: Aug 2006
Posts: 540
murfreesboro, TN
Qbird
mopar
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mopar
Joined: Aug 2006
Posts: 540
murfreesboro, TN
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Quote:
Quote:
On the other hand, a Fuel-Slant is something I've thought about for years. I'm surprised nobody's ever built one.
It has been done. The green 5 speed Lancer that Mark Goodman drove was run on 30% a couple times. It was an injected methanol car to start with, 30% picked it up around 4 tenths. Car went 10:30's around 125mph. 
Not to be a nitro-snob, but 30% is not a Fuel-Slant. 30% is a hopped up alky combination. I'm talking 90% and up. Completely different deal.
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Re: NITROMETHANE Question
[Re: slantzilla]
#737202
07/01/10 09:51 PM
07/01/10 09:51 PM
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Joined: Aug 2006
Posts: 540
murfreesboro, TN
Qbird
mopar
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mopar
Joined: Aug 2006
Posts: 540
murfreesboro, TN
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Quote:
Quote:
Not to be a nitro-snob, but 30% is not a Fuel-Slant. 30% is a hopped up alky combination. I'm talking 90% and up. Completely different deal.
Unfortunately on 90% you'd be driving over a whole lot of Slant parts. IIRC, on 30% they found some cracking in the crankshaft.
At lower percentages, you're forced to run very lean to make any power, and so detonation is an issue. Once you start getting up there, over 80 percent, you can run it extremely fat, which not only makes the power, but does so with nice rounded power pulses. Tuned right, it's actually easier on parts.
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