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Post by TruseiC on May 28, 2014 13:08:55 GMT -5
Hello, today was about to get my dremel and do some cylinder modifications done, but, got a question, how much can i raise my exhaust port? Had the formula for that, but i kinda lost it
Does anyone have it?
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Post by 190mech on May 28, 2014 14:14:41 GMT -5
Oh My!!Simple question,1000 answers!!!I will ask some questions now,what brand,type,size of engine?What is the bore and stroke?What do you plan to use it for?Do you plan to make other mods also??
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Post by TruseiC on May 28, 2014 14:27:31 GMT -5
Honda af18, air cooled, vertical cylinder engine.
39mm bore
40mm stroke
stunt purpose only.
Will do some cvt tuning.
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Post by 190mech on May 28, 2014 20:07:29 GMT -5
Stunt work will need a torquey build.That would not require much work.Checking your current port timing with a degree wheel will give us all some real numbers to think about; 49ccscoot.proboards.com/thread/353/port-durations-degree-wheel-methodsYou can likely get your desired torque with some mild port and head work,or a 70cc kit would be a better/cheaper solution.. |
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Post by 2strokd on May 29, 2014 10:34:29 GMT -5
I think Polini offers the iron Sport kit for that engine. If so and its in your budget this kit will provide plenty of stunt toque. I have owned a couple of those kits with great results!
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Post by TruseiC on May 29, 2014 11:09:08 GMT -5
Well, for now i have very limited budget, gotta wait till July for some real $$$
so now im trying to squeze out the max, what this engine can give with stock parts
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Post by vlatx on Jun 8, 2014 18:55:35 GMT -5
You can grinde of the exaust port by 2mm up ,and 2mm sideways.and get a comresion ratio at 11:1 for more torque.
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Post by TruseiC on Jun 9, 2014 2:52:25 GMT -5
2mm to both sides, or 2mm to one side, and then 2mm to other?
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Post by vlatx on Jun 9, 2014 6:00:23 GMT -5
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