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TurboNova
Joined: 08 Dec 2004
Posts: 1067
Location: Lake Havasu City, AZ
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 Posted: Thu Oct 13, 2011 8:10 pm Post subject: |
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Really fuel does nothing to stop knock. Timing does. If you get a car on the Dyno and make it knock you can add fuel and it will not make knock go away. If you run I rich with too much timing it will not stop it from knocking either. Try it.
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Roberto Arano
Joined: 22 Nov 2005
Posts: 358
Location: colorado
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| Posted: Thu Oct 13, 2011 8:31 pm Post subject: |
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I suspect this is because, although, adding fuel may cool the chamber,richer mixtures also burn slower, which promotes knock.
Note: I am assuming here that richer means richer than rich best torque point.
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Last edited by Roberto Arano on Sat Oct 15, 2011 11:41 am; edited 1 time in total |
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StantonWarrior
Joined: 10 Dec 2010
Posts: 188
Location: UK
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| Posted: Fri Oct 14, 2011 12:04 am Post subject: |
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Personally I think any cooling effect is more likely to be on the charge in the port as opposed to the chamber; even then I don't think it's going to be significant....certainly it's never helped me.
As well as slower flame propagation, you've also got more potential energy available.,..so all things said, "going rich" isn't a great option. |
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gsportcars
Joined: 19 Oct 2009
Posts: 57
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| Posted: Sat Oct 29, 2011 12:50 pm Post subject: |
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| So if going rich does not decrease/stop knock with the same timing then if an engine is not knocking but is running rich, will reducing fuelling not increase the tendancy to knock? |
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chrisccm
Joined: 24 Jun 2010
Posts: 48
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| Posted: Sun Oct 30, 2011 9:02 am Post subject: |
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| gsportcars wrote: | | So if going rich does not decrease/stop knock with the same timing then if an engine is not knocking but is running rich, will reducing fuelling not increase the tendancy to knock? |
I aways had it in my head that running richer afrs would help stop knock too |
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TurboNova
Joined: 08 Dec 2004
Posts: 1067
Location: Lake Havasu City, AZ
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| Posted: Sun Oct 30, 2011 11:14 am Post subject: |
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| gsportcars wrote: | | So if going rich does not decrease/stop knock with the same timing then if an engine is not knocking but is running rich, will reducing fuelling not increase the tendancy to knock? |
NO! Try it on the dyno.
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chrisccm
Joined: 24 Jun 2010
Posts: 48
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| Posted: Sun Oct 30, 2011 1:23 pm Post subject: |
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That's good info  |
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Turboivo
Joined: 09 Mar 2006
Posts: 671
Location: Bulgaria
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Bugermass
Joined: 13 Aug 2007
Posts: 32
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| Posted: Wed Jan 18, 2012 10:10 pm Post subject: |
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| chrisccm wrote: | | gsportcars wrote: | | So if going rich does not decrease/stop knock with the same timing then if an engine is not knocking but is running rich, will reducing fuelling not increase the tendancy to knock? |
I aways had it in my head that running richer afrs would help stop knock too |
I think it can go either way. I've seen richer mixtures cause MORE knock and i've seen richer mixtures cause less knock depending on the engine/setup. I've leaned cars out before to get rid of knock in some situations, I don't think there is a general rule when it comes to mixture and knock as differences in the engine/setup will change how much the mixture effects the burn speed and combustion stability. I think the best solution is to just remove timing in most cases. I have some extended theories on this, but its late. Maybe tommorrow?  |
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dkGoodrich dot com
Joined: 18 May 2010
Posts: 159
Location: Frankfort KY
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| Posted: Thu Jan 19, 2012 2:16 am Post subject: |
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Chris! Glad to see you on this forum.
With a whopping 5 post since 07' lol
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Bugermass
Joined: 13 Aug 2007
Posts: 32
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| Posted: Thu Jan 19, 2012 6:10 pm Post subject: |
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| dkGoodrich dot com wrote: | Chris! Glad to see you on this forum.
With a whopping 5 post since 07' lol |
Haha, yeah I've been sneaking around this forum for a while. Probably be here more often now .. |
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