12-18-2017, 02:44 PM | #106 |
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More aggressive like you did. I have some abrasive buffing wheels coming in tomorrow so I can polish it out. https://www.amazon.com/gp/product/B075PVWJXX
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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12-18-2017, 03:04 PM | #107 | |
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Quote:
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12-18-2017, 03:20 PM | #108 |
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For the price I couldn't pass them up.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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12-21-2017, 08:47 AM | #109 |
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Picture updates????
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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12-21-2017, 10:12 AM | #110 |
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I get home tomorrow. I will try lol
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12-23-2017, 02:25 AM | #111 |
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Here Jerry. I tried to show it, but Cameras don't do a good job of showing the finish. It's a lot more shiny than it appears lol. This is my finished product after a bit more work. I trenched out the sides of the valve guides and blended them in more with the bowl. No more ridges!
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12-23-2017, 03:49 AM | #112 |
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Surely you will feel a little crisp-ness in the throttle now. That looks like a nice air molecule slide to me
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***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
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12-23-2017, 04:46 AM | #113 | |
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Quote:
I tried to get the angles exactly the same, but not quite perfect. Close enough to make a point though. I still have a little more I want to do on the intake side, but for the most part I am done.
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12-23-2017, 05:01 AM | #114 |
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the shape looks good..
keep at the finish... you will get there..it takes time..
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12-23-2017, 05:17 AM | #115 |
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I am not too worried about the finish. It's smooth to the touch, but the camera shows a lot of the imperfections you can't see with your own eyes, mostly small scratches. It's the shape of the port that matters the most. Obviously, I will still work at it a little bit, but it's 99% there at this point.
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12-23-2017, 10:56 AM | #116 |
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Looking good .
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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12-23-2017, 11:56 AM | #117 |
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The ports really opened up nicely. A regrind cam would help but with a single lobe, how much would it really help. Would it be possible to play around with offsetting the cam sprocket? I'm not sure if it uses a key, a pin, or some other means of keeping them together and in time.
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12-23-2017, 01:30 PM | #118 | |
Join Date: Apr 2017
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Quote:
For me, it's more a matter of useable power. I want to try and keep a flatter power curve. That is why my intake porting is a little less aggressive than the exhaust side. Even if that means I sacrifice a little peak hp, I am okay with that. These engines already have a larger than necessary intake port, so simply focusing on smoothing transitions and reducing the pinch point at the valve guide is more than enough. The exhaust side is the greatest restriction in these heads, bar none. Being able to evacuate the exhaust from the cylinder as quickly and efficiently as possible will make more room for fresh air and fuel, which will increase the efficiency of the intake side. The roof area on an exhaust port is the best place to perform porting for making more power, and also where these heads need the most work. You will notice that the majority of my porting work focused on opening up that exact area.
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12-24-2017, 12:45 AM | #119 |
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Meg...can you get an app that will measure g force or some kind of hp simulation so you can take road measurements? Saying this since it seems you indicated previously that the dino fell thru. I think this would be a good way to at least quantify what you have done. No, it would not be accurate/ perfect and all that but just like a inaccurate bathroom scale, as long as you use the same one you know what you have gained or lost.
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***************************************** 2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE 2017 Suzuki V Strom 650 XT "We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~
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12-24-2017, 01:47 AM | #120 | |
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Quote:
I think the only thing I will leave out is a dyno with the VM30 carb. The VM26 will be far easier to adjust the jetting for and get back on the road. Plus, I think it would be more realistic in representing what most Hawk/Bashan/TT owners would want to do. The VM30 will require a lot of tuning from scratch.
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