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Old 03-19-2004, 08:01 AM
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nitrous with high or low compression?

I would like to know your opinions on nitrous with compression ratio. I have the options of 9:1 to 11:1 compression. Without debating on gas or octane needed, which motor would respond better to the nitrous. Assuming the motor was all forged and bulletproof. Which one would make a better nitrous motor or doesnt it matter?

9:1 motor @ 450hp w/300 shot of nitrous total 750hp
11:1 motor @ 500hp w/250 shot of nitrous total 750hp

Would one experience more wear or heat. Would one motor tend to have more problems. Would one make a better street motor. I can find any articles on nitrous vs compression. Since both motors make the same end hp which is a better choice for use with nitrous

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Old 03-19-2004, 08:56 AM
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Nitrous is basically a liquid supercharger. If you run the low compression option it will be easier on parts, but will be a "pig" when not on the bottle. If you run the higher compression it will be better off the bottle but will be harder on parts when on the bottle. I know you didn't want to put octane into this, but it will play a HUGE role. In either case with over 200HP shot you will need to run race fuel in at least your enrichment circuit (separate fuel system/cell and pump for the nitrous).

If this is a race only car and will always be on the bottle I would probably run the lower compression. If it is a street car I might consider the higher compression so I would have more power while normally aspirated.

Make sure you pick a nitrous friendly cam. Wide LSA just like a blower (which you are familiar with)

Royce
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Old 03-19-2004, 12:02 PM
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The 11 to 1 engine. But just remember you won't gain 250 HP on a 250 Shot. If you get 75% you would be lucky. They rate those for perfect conditions.

Chris
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Old 03-19-2004, 05:08 PM
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Nitrous loves high compression. Look at guys like Switzer and Glidden. 16 to 1 C/R's. Myself I run 12.4 to 1. As long as you keep all the safeguards in place, the right fuel, the correct timing and plugs, you should be in good shape. With the MSD 7 set up I have, when the N2O flows, it automatically pulls the timing out. I run an NGK "V' power number 10 plug, and have a Hobbs switch in place to moniter F/P which is set at 5 pounds. Never have had a problem. For the fuel I run C16. So far I have only run a 150 shot. 10.68 @ 122 off the bottle, 9.74 @ 137 with a 150 shot. The thing about N2O is not so much the HP rating, but what it does to torque. It will triple it, and will launch the car hard. 1.360 sixty foot on a 10.5 inch tire. Love it.

Ron
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Old 03-19-2004, 05:13 PM
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I don't know much about N20, but from what I've heard, I didn't think you used it upon launch. Just wondering....
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Old 03-19-2004, 05:23 PM
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Why not use it on launch? Stage the car, apply the Transbrake, foot to the floor, 5200 RPM on the limiter. When the transbrake button is pushed, it also pulls 12V from the solenoids, so as long as that button is down, even when you close the WOT switch no N2O will flow. When I release the Transbrake, it counts down through the RTD, and hopefully at the right moment, disengages the Transbrake and simultaneously puts 12V on the fuel and N2O solenoids. The car is already at 5800 RPM and WOT.

Ron

After re-reading my post..it sounded like I was lecturing...sorry..I get carried away.

Last edited by red347; 03-19-2004 at 06:34 PM.
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