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| Mexicano |
 Posted: Wed Jan 27, 2010 8:24 am |
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Joined: 12 Jul 2007
Posts: 2108
Location: Mexico
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dio burnout wrote: Man my head is swimming in math equations, building a 2 stroke engine takes alot of planning. This is not a plug n play type of build. Check and recheck.
That's the way It should be with every 2T engine....those really "well tuned" engines takes a lot of time and knowledge. |
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‘There is only one secret in scooter tuning – to know what you are doing and do it thoroughly’ |
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| 6'6"ninja |
| Posted: Wed Jan 27, 2010 2:42 pm |
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Joined: 09 Dec 2008
Posts: 255
Location: Aliso Viejo, california
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| i would rather port a 2stroke any day over 4 stroke. Atleast with a 2T I can get a good port job with simple math. 4T is all pretty art work that can go wrong quick. Can you put a thiner base gasket on to get that trans timing down? Whats your squish right now? If you get that trans down you could stagger the main/aux boost........ If not dont stress 130.5 is pretty good. |
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| Mexicano |
| Posted: Wed Jan 27, 2010 8:57 pm |
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Joined: 12 Jul 2007
Posts: 2108
Location: Mexico
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6'6"ninja wrote: i would rather port a 2stroke any day over 4 stroke. Atleast with a 2T I can get a good port job with simple math. 4T is all pretty art work that can go wrong quick.
You need more than simple math to do a good port job...2T porting can go wrong very easy, also good port job is art work too.  |
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| 6'6"ninja |
| Posted: Wed Jan 27, 2010 9:05 pm |
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Joined: 09 Dec 2008
Posts: 255
Location: Aliso Viejo, california
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well atleast with 2t you have somewhat of a guide line is what I was trying to say.
dio burnout. Have you checked your timings with your degree wheel? For me that is the most accurate way. |
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| dio burnout |
| Posted: Thu Jan 28, 2010 10:09 pm |
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Joined: 18 Apr 2009
Posts: 432
Location: Tokyo Japan
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Well I finished up the cylinder, I am happy with the durations numbers. I sure hope it was worth all the work !!!!!
Trans tunnels, boost port, roof of exhaust port.
Exhaust port, Transfer edge chamfering
Exhaust port raised to 22.56mm from the top of the barrel.
New port map of cylinder porting work compared to stock port map.
The timing duration numbers are as follow with the deck set at .45mm above the deck.
Exhaust 192.1
Main transfers 131.1
Aux transfers 131.1
boost 133
Stock exhaust was 64 percent of bore, now its 71.2 percent of the bore Dia. I am a little nervous about this as Jennings recommends not to exceed 70 percent on one exhaust port. Bridge type ports can go bigger.
Jon M. |
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| dio burnout |
| Posted: Thu Jan 28, 2010 10:14 pm |
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Joined: 18 Apr 2009
Posts: 432
Location: Tokyo Japan
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Also forgot to mention I lost a little on the transfers after chamfering the edges.
Jon M. |
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| Mexicano |
| Posted: Thu Jan 28, 2010 10:23 pm |
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Joined: 12 Jul 2007
Posts: 2108
Location: Mexico
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Your cylinder looks so nice..congrats!!!!...You did a great job with it.
Regards. |
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| dio burnout |
| Posted: Tue Feb 02, 2010 9:08 pm |
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Joined: 18 Apr 2009
Posts: 432
Location: Tokyo Japan
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Mexicano wrote: Your cylinder looks so nice..congrats!!!!...You did a great job with it.
Regards.
Javier
Thanks for the kind words and all the help over the last few months on this engine.Still more work to do.
Well pressured up the engine to check for any air leaks. Everything seems to be ok case has been holding 2PSI
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| Enviromoto |
| Posted: Tue Feb 02, 2010 10:25 pm |
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Joined: 23 Feb 2009
Posts: 187
Location: Camby, IN.
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| Man that motor is so sick! So your going to be putting this into what chassis? |
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| Shaka |
| Posted: Wed Feb 03, 2010 12:19 am |
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Joined: 03 Nov 2009
Posts: 95
Location: Wilmington, NC
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Mmmm. . . shiny!  Beautiful work! |
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| Mexicano |
| Posted: Wed Feb 03, 2010 12:45 am |
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Joined: 12 Jul 2007
Posts: 2108
Location: Mexico
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dio burnout wrote:
Javier
Thanks for the kind words and all the help over the last few months on this engine.Still more work to do.
Well pressured up the engine to check for any air leaks. Everything seems to be ok case has been holding 2PSI
Jon,
It is my pleasure, You know it! 
Raise the pressure to 6 psi and check in 5 minutes.
Regards, |
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| 2strokd |
| Posted: Wed Feb 03, 2010 12:07 pm |
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Joined: 28 Oct 2009
Posts: 273
Location: Lafayette IN
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Very nice engine!
Great build-up, good job  .
Cant wait to hear how well it runs! |
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| dio burnout |
| Posted: Thu Feb 04, 2010 8:08 pm |
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Joined: 18 Apr 2009
Posts: 432
Location: Tokyo Japan
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Enviromoto wrote: Man that motor is so sick! So your going to be putting this into what chassis?
Thanks for the kind words, my plans for this engine is to street it on the weekend in my Live Dio setup.
I will need to fabricate some engine mounts, because this setup is for an AF35 horizontal type engine. The Af18e is a vert type engine block. But my overall plan is to use both engines in this scooter. After I install the Af18e engine I want to build the Af35 into 117cc water cooled street machine. I just really enjoy building the engines as a hobby. I have a 4 stoke Dio for cruising around, and also a car for running the family around town.
Jon M. |
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| dio burnout |
| Posted: Thu Feb 04, 2010 8:29 pm |
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Joined: 18 Apr 2009
Posts: 432
Location: Tokyo Japan
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O.K. ready to move on to the clutch system. I am going to make a parts store run this weekend and wanted to ask if anyone has any thoughts about a baseline setup.
Contra spring ? clutch spring ? torque drive ? also gear ratio ?
My plans are to run taller gears, but not sure how much taller ? I want this to be fast as hell of the line. Any suggestions would be great.
Thanks
Jon M. |
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| sanjuro62 |
| Posted: Fri Feb 05, 2010 2:20 am |
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Joined: 05 Oct 2009
Posts: 221
Location: Texas at the moment
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I'll be running 9:1 gears on my Dio, which should get me to 70 mph while still allowing some low end grunt. Here's a table of gears I've researched:
SR Set 12:42 (3.500) (12 to 1)
ZX Set 13:41 (3.153) (11 to 1)
SE50P 12:34 (2.833) (11 to 1)
Kitaco 15:42 (2.833) 305-1040300 (11 to 1)
Polini 16:32 (2.000) (7 to 1)
These are all primary gear setups meaning the primary shaft that is hooked up to the clutch and the larger toothed gear on the counter-shaft assembly are the pieces that get switched out.
For the 9:1 setup I had to order some parts from vtcycles in Hawaii. The big disc with all of the teeth on the final drive shaft gets switched out, and so does the smaller piece of the counter-shaft assembly. |
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