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Old 04-02-2013, 11:02 AM   #1
skelator
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How much compression on Pump gas ????

I'm about to order pistons and head gasket ect. So do I stick the thick cometic on or run a thin one ???
Pistons http://www.wiseco.com/ProductDetail....04&AppID=25677

13.35 compression should run on super 93... right ?
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Old 04-02-2013, 11:22 AM   #2
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Old 04-02-2013, 07:43 PM   #3
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it's all in the tune.
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Old 04-02-2013, 07:49 PM   #4
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Let me research this for
You, I'm actually intrested to know at what compression level you have to up the octaine


All I know as of now is te higher compression the higher octaine needed
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Old 04-02-2013, 07:53 PM   #5
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These heads on the newer bikes are really efficent, I don't think it really matters. I've run MR12 (87 octane) & pump 87,89,93 and never has any detenation or pre igntion issues, my head is decked .015 tho on top of a thin head gasket. As stated before just tune for what ever fuel you use.
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Old 04-02-2013, 07:57 PM   #6
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Quote:
Originally Posted by Slovy View Post
Let me research this for
You, I'm actually intrested to know at what compression level you have to up the octaine


All I know as of now is te higher compression the higher octaine needed
too many things are factored in here. SCR, DCR, cam profile and most importantly timing and fuel mapping. running 13.3 SCR on a street motor would require a custom ECM remap. and not just a fuel management system.
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Old 04-02-2013, 08:02 PM   #7
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btw 8.3-8.4 is generally regarded as max DCR for a pump gas motor. if you search around you can find the cheat sheet to calculate DCR.

edit: you CAN run more DCR and get away with it but it's not "recommended"

Last edited by brian1570; 04-02-2013 at 08:04 PM.
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Old 04-02-2013, 08:03 PM   #8
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Very true
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Old 04-02-2013, 08:04 PM   #9
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I found a chart.. And it doesn't seem Feasable to run that with a street bike without a lot of work (like Brian was saying
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Old 04-02-2013, 08:31 PM   #10
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It's fine
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Old 04-02-2013, 08:34 PM   #11
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I'm around 12.5:1 and I'm decked a bit. I spray on 93. It's all in the cam timing to dictate how much cylinder pressure you actually make anyway. Good luck starting it on 12v
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Old 04-02-2013, 08:50 PM   #12
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Quote:
Originally Posted by bluewave18 View Post
I'm around 12.5:1 and I'm decked a bit. I spray on 93. It's all in the cam timing to dictate how much cylinder pressure you actually make anyway. Good luck starting it on 12v
dynamic comp ratio
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Old 04-02-2013, 08:52 PM   #13
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For instance my cam timing still isn't where I want it. I'm making 205 In The cylinder. I'm wanting 230-240 psi.
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