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1 of my current projects: Water Cooled Cylinders :)
http://www.pilotodyssey.com/PO/viewtopic.php?f=1&t=17653		 Page 2 of 2
Author:  canadian oddy [ Sat Nov 11, 2017 4:19 am ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
methodical wrote:
I must say, it is much louder...much. I will need to wear ear plugs under my helmet from now on. It's not DG (lack of silencer loud) but it's close.


Hey meth you may have to make a custom muffler.
I had a formula car with a peripheral port rotary Engine. A rotary is actually a two stroke. It screamed and the exhaust was so hot you could see it glow on a sunny day as I went down the straight. Mufflers only lasted two races and I had to make my own. I did contact Jim Downing in Atlanta. He ran IMSA rotary cars. He told me if I could build a muffler to 105db that lasts and didn't create back pressure he would make me a millionaire. I did a lot of research and even bought a noise meter. Had to because the faggots would make us run 105db or we would get black flagged if over. I got a book on gun silencers and it was very helpful as well. Basically high frequency don't go around corners well. I built corners into my mufflers but this also creates back pressure which is deadly to power on a rotary. It was a give and take. You could not use packing because it would just burn out in a few laps. There were guys running very long straight through mufflers with packing that were successful but my issue was that I had a formula car and the Engine is at the back like an oddy. Not much room for a long muffler. Since our two strokes don't really run that hot that far back I bet you could use some packing to prevent "pinging" and two corners to kill the high frequencies. The most effective mufflers I ran were the non packing spiral core. I bet this would work well on the oddy.
Just a few thoughts.

This is what I basically made for my race car: http://www.jegs.com/p/Moroso/Moroso-Spi ... 9/10002/-1
One of these with a narrowed end to fit the pipe and a choked off exit. This would prevent high frequencies from escaping.
Author:  go oddy [ Sat Nov 11, 2017 8:00 am ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
Would mini resonator have an impact as well? Cancel out the higher annoying frequencies.
CO, I guess it's unlikely but I'll ask anyway, did anyone try that on the race circuit?
Then next question would be, does a two stroke resonator exist? Maybe touring sleds, more comfort than performance in that crowd.
Author:  canadian oddy [ Sat Nov 11, 2017 4:09 pm ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
go oddy wrote:
Would mini resonator have an impact as well? Cancel out the higher annoying frequencies.
CO, I guess it's unlikely but I'll ask anyway, did anyone try that on the race circuit?
Then next question would be, does a two stroke resonator exist? Maybe touring sleds, more comfort than performance in that crowd.


Not sure about that mini resonator use on the race track. I never noticed it on any car but then again I had no time to look around and spy. I was just to busy trying to keep my car running.
Author:  methodical [ Sat Nov 11, 2017 5:58 pm ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
CO, all very interesting...Believe it or not...I used to make very effective fire arm silencers for customers...But that's a whole other story>>>>>>

I have some simple fixes I'm gonna try, and if they don't work, I like your thinking about this. Wearing ear plugs will kinda stink..
Author:  adnoh [ Sun Mar 11, 2018 8:11 pm ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
Bump for reading later
Thanks for sharing.
Thought I seen a paper port map some where with numbers.
Was going to enter into a spreadsheet.
Author:  MGurgone40 [ Mon Mar 12, 2018 12:43 am ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
Just read this thread, your work is insane! I can believe how nice and neat it looks in such a cramped space! What do you do for a living, this can’t just be a hobby for you? Is that your shop at home? So that’s a Rands Head you modified, and did you completely fab the water cooled cylinder?
Author:  methodical [ Mon Mar 12, 2018 6:33 am ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
MGurgone40 wrote:
Just read this thread, your work is insane! I can believe how nice and neat it looks in such a cramped space! What do you do for a living, this can’t just be a hobby for you? Is that your shop at home? So that’s a Rands Head you modified, and did you completely fab the water cooled cylinder?


Thank you for your kind words. Yes this is a side hobby for me. I'm a scientist by trade (Biochemical Engineering). That is my home shop, I try to outfit it with the tools I need to do jobs exactly the way I envision them, no one will do it the way you will do it. That is a modified Rands head, and yes all the work on the cylinder and piston was performed by me in my shop.
Author:  John l [ Mon Mar 12, 2018 8:08 am ]
Post subject:  Re: 1 of my current projects: Water Cooled Cylinders :)
Meth - You are the coolest cave man. All the rest of us are grunting in the corner of the cave and there you are with the bic lighter you just invented... all the ladies warming by your fire. Geez what a slice of work man, very nice.

Im in PA too guys. You see how we roll here? haha
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