Dear Diary: Fabrizi 50mm bore portmap/Port timings
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Dear Diary: Fabrizi 50mm bore portmap/Port timings
This has become an ongoing project that I've been documenting for myself and you (if you're interested in my bs) on my preparation for the installation of the 50mm bore kit on dio motor. I have added a pic of the widened and raised exhaust portmap. I left the transfers where they come stock. Raised the exhaust 5-6 degrees or roughly 1mm. This increased my blowdown as shown on the spreadsheet following. A link to the bigbnrg blog is included in the following that will explain port timing better than I can. Ill be running a malossi crank, yasuni c16, and 26mm polini pwk replica. Im hoping for solid power at 12k, a street suitable racing setup. This build will heavily depend on the c16. Enjoy!
Exhaust: ~180 degrees
Transfers and boost: ~125 degrees Ported exhaust: 186 degrees
Exhaust: ~180 degrees
Transfers and boost: ~125 degrees Ported exhaust: 186 degrees
- Attachments
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- Raised roughly 1mm oval out toward primary transfers. Ive cleaned up and leveled the transfers, but timing is the same. No need to update.
- 20150114_210423.jpg (108.39 KiB) Viewed 11698 times
Last edited by DirtyE on Thu Jan 15, 2015 5:17 am, edited 7 times in total.
98 Elite
4 strokes are for cars
4 strokes are for cars
Re: Fabrizi 50mm bore portmap
hi dirty. Thanks for posting the map. If you make any changes will you post it ? Thanks
Life's a trip enjoy the ride.
94 elite SR, 86 spreedio, polini corsa, keli variator, 8.4, jet. speed 65 mph
spreedio video. https://www.youtube.com/watch?v=BZr46_-douQ
94 elite SR, 86 spreedio, polini corsa, keli variator, 8.4, jet. speed 65 mph
spreedio video. https://www.youtube.com/watch?v=BZr46_-douQ
Re: Fabrizi 50mm bore portmap
Gathered info for timing calculations;
41.4 stroke
6mm squish
80mm conrod
Distance from the top of the ports to the cylinder top.
41.4 stroke
6mm squish
80mm conrod
Distance from the top of the ports to the cylinder top.
Last edited by DirtyE on Thu Jan 15, 2015 5:20 am, edited 1 time in total.
98 Elite
4 strokes are for cars
4 strokes are for cars
Re: Fabrizi 50mm bore portmap
Ill try to get a mhr replica portmap today while im there as well.
Anyone here that has a corsa they could post? We could start a new thread with common dio port maps
Anyone here that has a corsa they could post? We could start a new thread with common dio port maps
98 Elite
4 strokes are for cars
4 strokes are for cars
- swimmingfree
- CBR1000RR
- Posts: 3357
- Joined: Tue Jun 14, 2011 12:28 pm
- Location: mich.
Re: Fabrizi 50mm bore portmap
looks like this is going to be a nice build...
swimmingfree
swimmingfree
handicap (dyslexia)
looking for
se50 crank...
SpreJunk 87elite in a spree body
ruckus variator , 3.5 tire , 1500 drive face spring , a 64 bbk ,
8 gram rollers, stock carb , after market air filter and 105 jet
looking for
se50 crank...
SpreJunk 87elite in a spree body
ruckus variator , 3.5 tire , 1500 drive face spring , a 64 bbk ,
8 gram rollers, stock carb , after market air filter and 105 jet
Re: Fabrizi 50mm bore portmap
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Last edited by LMH on Sun Dec 28, 2014 12:26 pm, edited 1 time in total.
Re: Fabrizi 50mm bore portmap
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Last edited by LMH on Sun Dec 28, 2014 12:26 pm, edited 1 time in total.
Re: Fabrizi 50mm bore portmap
There is much debate online about what port duration is good for 12k, and the corresponding blowdown. I havent found a solid pipe for making power at this rpm yet anyway, although one may be in the works. Tuning this cylinder would be silly if there isnt a pipe that would work with it.
98 Elite
4 strokes are for cars
4 strokes are for cars
Re: Fabrizi 50mm bore portmap
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Last edited by LMH on Sun Dec 28, 2014 12:27 pm, edited 1 time in total.
Re: Fabrizi 50mm bore portmap
I understand there are many factors to setting the rpm where you want power to be made. As well, I do not have the financial luxury of sending out kits for professional port work. Im happy to take measurements as accurately as possible and try to learn something from it. I have always had success with my port jobs, as they've made me happy. Not professional, backyard all the way. Ive had great luck in having friends worldwide on forums that will analyze the data with me.
I know tuning high rpm is not easy. Ive been there. It is endless and exhausting. Jet and roller/spring changes lead to striped bolts and nuts from constant removal and replacement.
Ive had many p ipey setups. Ill get there again.
I have not been in dio land long. I dont see a pipe that is reasonably priced that I trust. For my mina and piaggio builds it was easier; go find dynographs and pic your pipe.
Btw, 13 is higher than I want to spin. 11-12k.
I know tuning high rpm is not easy. Ive been there. It is endless and exhausting. Jet and roller/spring changes lead to striped bolts and nuts from constant removal and replacement.
Ive had many p ipey setups. Ill get there again.
I have not been in dio land long. I dont see a pipe that is reasonably priced that I trust. For my mina and piaggio builds it was easier; go find dynographs and pic your pipe.
Btw, 13 is higher than I want to spin. 11-12k.
98 Elite
4 strokes are for cars
4 strokes are for cars
- paulpauly7
- CB900F
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- Location: nz
Re: Fabrizi 50mm bore portmap
My scorpion pulls fine at 11250 all day everyday on my corsa .The ports are stock on the cylinder but i mirror finished the top of the piston and the head and the export.Pics of my bike and scorpion pipe in G9s calander thread .
86 Nifty Fifty (spree)
ZX disk brake
Kitico 120kmh speedo
AF18 ZX ported
Polini corsa
Malossi crank
CTmani
24mmOKO
40pilot118main
Scorpion pipe
8.44 to 1
Michelin s1
71.3mph
92 yz125, 94 crm250
ZX disk brake
Kitico 120kmh speedo
AF18 ZX ported
Polini corsa
Malossi crank
CTmani
24mmOKO
40pilot118main
Scorpion pipe
8.44 to 1
Michelin s1
71.3mph
92 yz125, 94 crm250
Re: Fabrizi 50mm bore portmap
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Last edited by LMH on Sun Dec 28, 2014 12:27 pm, edited 1 time in total.
Re: Fabrizi 50mm bore portmap
I got to look a little closer at my cylinder today. Im impressed with how well the opening of the transfer ports are all fairly even. I've seen kits that are more than a millimeter off. All transfers should open at the same time. I havent gotten my timing figured out yet, but a good chamfer will even these ports out.
- Attachments
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- 20141227_204128.jpg (126.16 KiB) Viewed 11863 times
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- 20141227_204118.jpg (118.73 KiB) Viewed 11863 times
98 Elite
4 strokes are for cars
4 strokes are for cars
Re: Fabrizi 50mm bore portmap
I think I want to cut out the bottom of the lower boost port in the cylinder skirt. I havent seen it closed off like that before, but Ill wait to do a mock up with the new crank installed to see how far down the piston travels.
98 Elite
4 strokes are for cars
4 strokes are for cars
- paulpauly7
- CB900F
- Posts: 1945
- Joined: Tue Feb 21, 2012 6:57 pm
- Location: nz
Re: Fabrizi 50mm bore portmap
looks more like just scuff marks from where he moved the ring into place .
86 Nifty Fifty (spree)
ZX disk brake
Kitico 120kmh speedo
AF18 ZX ported
Polini corsa
Malossi crank
CTmani
24mmOKO
40pilot118main
Scorpion pipe
8.44 to 1
Michelin s1
71.3mph
92 yz125, 94 crm250
ZX disk brake
Kitico 120kmh speedo
AF18 ZX ported
Polini corsa
Malossi crank
CTmani
24mmOKO
40pilot118main
Scorpion pipe
8.44 to 1
Michelin s1
71.3mph
92 yz125, 94 crm250