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Post by 90GTVert on Nov 1, 2009 23:18:02 GMT -5
I thought it might be a good resource to post up any port maps we've made in one thread for reference. Please include the manufacturer/model/part number/seller or any relevant info that you know. If you've made mods to the cylinder, please post details of what you did and what it accomplished. If you've got links to other port maps, please post those as well. If anyone needs a little help making a port map for the first time, look here... 49ccscoot.proboards.com/index.cgi?action=display&board=yamajog&thread=446
Minarelli AC 54mm cylinder from eBay seller Autotech355. Stock. I raised the exhaust port about 1mm later and improved top end power a little bit. 
Minarelli AC 52mm cylinder from eBay seller Autotech355. Milled 3mm from the top. Never made much power and had lots of issues with detonation.  |
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Post by 2strokd on Nov 2, 2009 7:54:46 GMT -5
My first map, more to come ;D Polini Corsa Sport 47mm bore  I need a set of digital calipers  |
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Post by 90GTVert on Nov 4, 2009 13:04:47 GMT -5
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Post by 190mech on Nov 8, 2009 19:31:59 GMT -5
Here is the Autotech355 70cc,48mm cylinder,hope I got enough dimensions..Ex port height=18.6 Transfer height=9 Aux=13.2  |
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Post by 90GTVert on Feb 22, 2010 10:12:13 GMT -5
Finally remembered to do the Airsal kit...  |
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Post by 2strokd on Feb 22, 2010 10:34:33 GMT -5
Heres a rough draft portmap of the Alchemy Moto Aluminum cylinder i got.  |
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Post by drawkward on Mar 26, 2010 18:58:12 GMT -5
Port map of a 71.1cc Kit from Autotech355 (Carlos) on eBay. This kit fits as a replacement for the 1E40FM cylinder. May fit other applications as well. The stroke is ~41mm. The piston diameter is ~48mm. I didn't measure every little thing. I thought it was would make it more confusing that way. Let me know what you think.  |
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Post by reveeen on Jan 1, 2011 15:33:41 GMT -5
No port map, just some baseline numbers:
Engine: Stock 1985 Honda 80cc Aero (NH80)
Exhaust open 80 deg BBDC
Exhaust close 80 deg ABDC
Scavenge open 55 deg BBDC
Scavenge close 55 deg ABDC
Exhaust~160 degrees, Intake~114 degrees
The "plan":
Fabricating a 1.5mm spacer (between cylinder and crankcase) out of aluminum, and manually opening (grinding) the exhaust port upwards 1mm.
Resulting in:
Exhaust~180 degrees, Intake~130 degrees
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Post by Thebatman on Jan 4, 2011 21:17:18 GMT -5
 Trying the pic thing guys... Here is my soon-to-be new cylinder.. I dont know the timings but i did get the measurements.. Its a malossi 70cc cast iron |
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Post by 90GTVert on Feb 1, 2011 10:44:58 GMT -5
Hoca 54mm BBK Minarelli AC  Previous port maps were measured straight line on an unrolled port map. This was measured by chord width. To be able to compare a little easier to the other kits, measurement of the ex ports would be left aux ex : 7.3mm, ex : 30mm, right aux ex : 7.75mm. |
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Post by drawkward on Apr 9, 2011 8:47:11 GMT -5
 50mm Bore Liquid Cooled |
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Post by Reign on Dec 31, 2011 17:55:57 GMT -5
Here's the port map for my Polini Sport 46mm bore. Numbers at the top are the height of the ports.  |
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Post by 2strokd on Apr 11, 2012 7:42:11 GMT -5
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Post by 2strokd on Apr 15, 2012 17:05:28 GMT -5
I gotta get a few more measurements but heres a rough map.. Metrakit SP series L/C 800AO532 EQ/AP 74964 SP  |
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Post by eel on Jun 8, 2012 19:28:21 GMT -5
That metrakit looks very similar to a polini evo. That cylinder with v force reed block and yasuni c30 pipe would hit hard!
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