E8 - HOW TO: Portmaps, Port Durations, And Port Angles. 2STROKE STUFFING
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- Опубликовано: 17 июл 2024
- Tutorial: How to make portmaps, find port duration, port corner radius, port flow width, and port height,
Here's a great tool for converting piston travel in mm to degrees of crankshaft rotation:
www.dansmc.com/mc_software2.htm
Thanks for watching! 
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Great video. I just ported my first cylinder. I am going to follow your advise using the solder method to check the upward and horizontal angles of the main and auxiliary transfers.
You are awesome. I enjoy all your videos, especially the one where you melted the plug running on nitro. The way you thought about drilling out the pilot jet risking ruining the carb. I was like my kind of guy.
+Wesley Young Thanks! Glad you like em!
I also like solder for finding port angles, as well as some .062 annealed aluminum tig welding wire . good content !
Thanks! Glad you liked it!
I have bought 1990 Kawasaki 650sx standup jetski just a be week before new year, and caught covid just after the first day of water tests:) so all my previous 2 weeks Iv spend watching your videos and sometimes one video for 2-3 times:)) great thanks for your work! Originally I’m from Moscow Russia and before Iv started living in Barcelona Iv had 4 (from my age of 21 till 27) of the Subaru legacy’s RS first generation and all my life was in garage with turbo opposite engines:) Iv never had a clue about 2t and now I’m exploring this wonderful new world for me:)
I think very soon I’ll make some videos based on your knowledge base😎
Cheers!
That's a really clever method of measuring port timing. Thanks for sharing.
I am enjoying your videos so far, great work.
+NicGyver Great, thanks!
Calculator for converting MM to Degrees also here :) concubidated.com/moped/ignition.php
Thank you for the lesson on two stroke nomenclature.
in FInland we have asennuskaljat, which means installation/assembly beers, you have design whisky instead :D
Awesome and informative videos! I went tuning my stock am6 50cc cylinder but went a bit overboard with the exhaust duration... its 197,5 degrees now.. transfers are 132. would that still be good for a tuned streetbike given it has a good exhaust pipe you think? Keep the great videos coming!
First of all congratulations on your awesme job... i´m addicted to your channel.
How much tranfer duration you have?
and abou the last dyno curve top peak power is about how much rpm.
Thanks! The Spx has 130A, 132B,C transfer duration and best so far is 17.6hp at the rear wheel.
Hi! Very nice video! Pleasure to follow you! Do you used a flat piston head to do measurements from the BDC to port opening?
Great videos and content. Thanks👍
I too like whisky and the sound of the cork lol
Thanks man! That sound...
the sound of the unsound (not judging, only a puns loving buff. A whisky loving buff too...)
Awesome stuff . Thanks for sharing. 👍👍
At times it was difficult to see what you were drawing on the paper. I suggest using a 3D CAD program (say, SketchUp. It is free and easy to use) to illustrate the key angles of the ports. It is very easy to move around in the CAD model of a SketchUp drawing. These views could be overlaid onto the video on one side to make it clearer to the viewer what you are talking about. After watch this video, it got me thinking of building a 3D coordinate measuring machine from a #D printer. The machine could use a bent wire as the pointer and an electrical circuit could be used to detect when the pointer makes contact with the metal cylinder. Programs could be written to move the pointer along various paths with it touching the wall and recording the coordinates.
It was good for determining your port sizes and angles but then what do you do?
You pat yourself on the back and walk away with the pride and dignity of knowing you have completed the infamous port mapping
Modify them !
Great Video As Always. So Did You Get Around To Building A Motorized Bike Yet. I Know Your A Busy Guy. Keep Up The Awesome Video,s.
+shane kersey Thanks! Not yet, Focus is on the Spx and the methanol/nitromethane testing.
What do you do after this step tho. Grewt vid I did understand most of it but what do i do what that imfo next tho.
My piston stays 2mm over the exhaust port when bdc i cannsee de Hole piston ring thrue the exhaust port.. would i benefit of spacing the cylinder and decking it
Thank you
Thanks buddy this is great stuff… I need to try to get some scratches filled up with the nikasil lining at home so I need to learn how to do that process… not sure what those electrodialysis steps are??? Please tell me those four or five materials of that process please! 😂😂😂
What Die grinder do you use to change ports if needed, top view btw
What are you using for a model in your example please. I’m looking to upgrade my cylinder with a better model... any info and thanks.
Your "nice diagram" is so nice and colorful - are you a Waldorf / Steiner school teacher? Reminds me of the many colorful diagrams I made in Waldorf school over the years.
How are you, what is the total horizontal angle or how can I calculate it?
good vid
Awesome video, but I don't quite get how you calculated 2.2mm thickness off a 1.5mm wire at 45 degrees as you showed at 11:36. Could you perhaps explain?
Has anyone figured this out yet? I’m lost as well.
Next time pour one for your guests, ,,you can drink it later. If ya make it to Tennessee, I'll pour ya two, Like your videos,
Hei, very interesting - i like your approach to 2 stroke tuning - its not rocket sience :-)
Q: Does the Engmod2t have variables with regard to ignition timing - or is it purely flow / gas view ?. Tks
Niels Vangsøe-Andersen Thanks! There's 3 combustion models to choose from in engmod, Burnrate Prescribed, Adjusted Wiebe, and Turbulent. All of them need RPM, Timing, and AFR input. Prescribed and Weibe also need Delay, Duration, VibeA, and VibeM.
Turbulent is slooow, Prescribed is fast. The trick is to run the Turbulent Model(calculates Delay, Duration etc. for you), create a combustion file from that run, import the file, and run in Precribed mode from there on. If you alter the shape of the combustion chamber, squish, exhaust timing etc. You will have to run Turbulent again.
Ok, tks, i will try to order it from his homepage..looking for tune program in which i can run various ignition curves for my Igni Tech fully programable ignition on my rotary valve 337 ,50 cc Cobra engine, without having to take her to be dynoed every time...i have www.vangsoetrim.dk....talk later, rgds Niels
Hi 2 stroke Stuffing - can i mail you directly ?. I think you and i may Exchange some experiences...have a look at some of my Work at: www.fickr.com/photos/vangsoe/sets - tks Niels
Niels Vangsøe-Andersen Sure! 2strokestuffing@gmail.com Couldn't get your link to work...
Hi
I am big fan of you..
And watch almost every video
I need a help for my 132 cc Yamaha RX cylinder.
Can using a STD sile sleeve on a cylinder work same as it came from the company.
Will it be successful and give same compression as an original cylinder
Thanks!
I'm not sure what you mean by "STD sile sleeve"?
@@2STROKESTUFFING oops sorry I had mis spelled it.. it was STD size sleeve
STD - standard (stock)
Sleeve - is an aftermarket inline wall of the cylinder with matching ports
Hi Sishir,It is very difficult to get the same performance from a sleeved cylinder as the original cylinder, because to match the ports as good as the original cylinder ports is extremely difficult.There is always a loss in performance due to mismatch.Regarding compression,u can check with a compression gauge,and shave/machine the top of cylinder if it is showing less compression than required to get the proper compression. Proper compression is very essential to get top performance.Also compression depends on piston to cylinder clearance and ring end gap.
cheers
Yep, I learned to set my wheel @ BDC, it's easier to set up an then I check it a bunch of times, ggz-👽👍
I mean duration
I have watched all of your porting videos multiple times over the years. I don’t know what changed but it all just clicked. Everything made sense as you explained it, but for some reason I have had a mental block and everything in a whole just didn’t come naturally to me. Previously I could have probably explained most of it one stage at a time picturing it and thinking.
Now I feel I’m ready for more then just experimentation and start my 32cc nitro meth.
Thanks dude. You rock!
Next time you come to the salt flats I will be there. I know you already have the hook up for tools and a crew, but if you want anything else a local person can do please reach out. Truck, trailer, tools, another set of hands to sweep up the salty work area....
I was ready to go in 2018 but I had a very unfortunate thing pop up three weeks prior.
Peace out Girl Scout
So we have different definitions of port map lol but this is also handy
👍👍👌
thats weird on that cylinder the boost port looks a little lower than the transfers its usually a bit higher
Mine too. After i rebore 2mm from stock. The boost port are lower than main and secondary port. Might lost a few top end. I'm not skilled enough to port it back so i let it go. 😂
why not make a mold?
Just installed a cheap 60cc cylinder on my moped and the low end power is non existent...
Why not just measure the opening angels on the crank?
+OSSA Nyberg Sure, that's a good way too!
I like the idea of using solder the get the roof angles. What simulation software do you use?
+Tanner Sibinski I'm using Engmod2t, great software, absolutely worth the money! vannik.co.za/EngMod2T.htm
Please indonesian subtittle
why dont manufacturers just make their sets complete so we dont have to do this???
why you always drinking?
Cause I like it! Seriously I'm not really drinking that much, just in the videos.
ok just dont ovor dose it hihihihih