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» Northern California Ford Owners     » Automotive   » Tech Talk   » Noob question, inspired by glenn

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Author Topic: Noob question, inspired by glenn
166 Merlo
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Yea well I was reading Glenn's thread and asked myself, why is low compression better then high compression with running a super charger? Does this also apply to any form of boost, like nitrous? I though nitrous liked higher compression? [patriot]

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Posts: 3954 | From: Thebay | Registered: Jul 2002  |  :
91 5.0
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Too much air in the combustion chamber, along with the elevated intake temperatures, due to the blower, can cause pre-ignition.

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Posts: 1316 | From: Fairfield | Registered: Jul 2002  |  :
Primer GR40
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Superchargers get the air hot with lots of boost. Too much heat and compression will lead to pre-ignition. Nitrous cools, it doesnt heat anything up, besides a little more fuel you burn. This is just a guess.

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HEAT

That's why low compression with boost is desirable. You can only run so much total compression (compression ratio * (boost in AU + 1)) before pre-ignition with a given octane occurs (the higher the octane, the higher temp/slower it burns). This is because whenever you compresses a gas, you heat it up. Heat up the air/fuel mixture too much & it will ignite.

N2O works very well with high compression for a couple of reasons. One, is that it is sprayed out at -120F degrees. This cools the intake air charge quite well. Also, with nitrous you're not compressing the air before it reaches the pistons.

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Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000  |  :
166 Merlo
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Shaun, you are a beatiful person [burnout] .

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Posts: 3954 | From: Thebay | Registered: Jul 2002  |  :
mustanggt5091
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Couldnt have said it better myself shaun [patriot]

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Posts: 2353 | From: Fairfield / Santa Rosa , Ca | Registered: Sep 2001  |  :
91 5.0
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So when nitrous is injected, it comes out at 120F? Explain that to me. I'd think it would be a lot cooler since it was going from very high pressure, ~1000psi, to atmospheric pressure. When a something goes from high pressure to low pressure, it gets colder. Same concept as your A/C system.

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Posts: 1316 | From: Fairfield | Registered: Jul 2002  |  :
JohnB
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Ahhh, 91...that's NEGATIVE 120 degrees.. [Smile]

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Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002  |  :
91 5.0
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quote:
Originally posted by JohnB:
Ahhh, 91...that's NEGATIVE 120 degrees.. [Smile]

Now that makes sense. I was wonderin about that. Shaun is a smart guy, so I was wondering what was goin on. I re-read it and saw the (-) sign this time. Thanks for pointing that out John. [patriot] [patriot]

[ September 25, 2003, 10:51 AM: Message edited by: 91 5.0 ]

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Posts: 1316 | From: Fairfield | Registered: Jul 2002  |  :


 
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