no class Posted December 31, 2016 Share Posted December 31, 2016 the old site had a thread on plenums and designs.....perhaps a new thread could be beneficial for upcoming projects ! there are so many designs being used out there but how many are actually efficient ? pros / cons / do's and don'ts . Quote Link to comment
no class Posted December 31, 2016 Author Share Posted December 31, 2016 here are a couple of interesting designs..... 3 Quote Link to comment
no class Posted December 31, 2016 Author Share Posted December 31, 2016 1 minute ago, zed said: nice workmanship just an example pulled from the net ..... and yes...the guy who made it did a fantastic job . Quote Link to comment
zed Posted December 31, 2016 Share Posted December 31, 2016 here's one i made years ago on my katana that I shouldn't of sold so I'm building another lol the other one I didn't make but will probably modify it & set it in a bit closer to the engine as the turbo is just poked inside at the moment Quote Link to comment
Arttu Posted January 1, 2017 Share Posted January 1, 2017 Here is something that I made few years back. Inside: And finished part. I don't know how efficient it really is but based on EGT readings flow balance between the cylinders is pretty good. And engine produces quite healthy power figures compared to boost and tune of the base engine so the plenum can't restrict flow too badly either. In my opinion the most important target for plenum design is to ensure even air distribution between the cylinders. This can be tricky if air is entering from side. Velocity of incoming air tends to pack air in opposite end of the chamber and then cylinders on that side will get more air. To prevent this some kind diverter arrangement is needed. Typically this is done with dual chamber construction like on my plenum and those in second post. Idea is to kill air velocity in the first chamber and then bleed air to the main chamber through narrow slot, row of holes or something similar. 3 Quote Link to comment
Leblowski Posted January 1, 2017 Share Posted January 1, 2017 Borrowed Arttu's design a few years a go for my slabby used the same plenum with a bit of alterations on my bakker. Works for me never measured egt on cilinders so cant say if all cilinders get even airflow I scratched my head about plenum design when i made this plenum cause i wanted to make the best plenum available but i must say my first simple plenum made of 60 mm tubing worked perfect also ... 4 Quote Link to comment
Maggo Posted January 2, 2017 Share Posted January 2, 2017 Great thread and work! Quote Link to comment
Havoc Posted January 10, 2017 Share Posted January 10, 2017 Original Mr Turbo, on long term loan Quote Link to comment
Screwriverracing Posted April 27, 2017 Share Posted April 27, 2017 And here's mine Cheers SRR 2 Quote Link to comment
Bigkenxx Posted April 28, 2017 Share Posted April 28, 2017 simple but it does the job 3 Quote Link to comment
no class Posted May 22, 2017 Author Share Posted May 22, 2017 Ok..... as I need to get my plenum sorted and am in the process of getting a design configuration.... I noticed several types using some sort of flow control . As this style is my first attempt and I am not sure of the hole sizes ..... I just don't want to create too much back pressure . Here is what I am starting with ( test piece #1). Oblong hole with radius .... 19 mm x 6 mm ..... quantity of holes not yet determined . I wonder if radiused round holes would be better ? Quote Link to comment
Arttu Posted May 23, 2017 Share Posted May 23, 2017 14 hours ago, no class said: Ok..... as I need to get my plenum sorted and am in the process of getting a design configuration.... I noticed several types using some sort of flow control . As this style is my first attempt and I am not sure of the hole sizes ..... I just don't want to create too much back pressure . Here is what I am starting with ( test piece #1). Oblong hole with radius .... 19 mm x 6 mm ..... quantity of holes not yet determined . I wonder if radiused round holes would be better ? Rule of a thumb is to make combined cross section of the holes the same as plenum feed pipe. Radius won't hurt I guess but on the other hand probably won't make big difference either. In the end the idea is to create restriction to direct air flow. So better the holes flow less effect they have. To some degree. Of course it would be better if you can change air flow direction smoothly without creating too much back pressure but usually this requires more room. It's balancing as usual. Quote Link to comment
mick-ne Posted November 26, 2018 Share Posted November 26, 2018 On 4/28/2017 at 6:05 AM, Bigkenxx said: simple but it does the job I am about to build my first Plenum. What are the thoughts about a simple design like BigKen but have a plate above the inlet forming a lower chamber and a row of slots in the plate. Would that cause too much backpressure ? Quote Link to comment
Bigkenxx Posted November 28, 2018 Share Posted November 28, 2018 I know mine is simple to others but I can only report how mine is I’ve had no problems runs great , boosts well but I’m not going all out but I can only admire the engineering in others quest for boost Quote Link to comment
mick-ne Posted November 28, 2018 Share Posted November 28, 2018 (edited) To be honest I was just going to copy what you have BigKen. But after looking at the way other people have made them with different methods of getting balanced air delivery to each inlet I thought it would be easy to make the plenum a little deeper and add a plate to form two chambers. I havent a clue if it would make anything better but I am worried about making things worse lol Edited November 29, 2018 by mick-ne Spelling without glasses ! Quote Link to comment
clivegto Posted November 29, 2018 Share Posted November 29, 2018 Simple one works fine on my set up. But may be a better designed one would be even better. 2 Quote Link to comment
Bigkenxx Posted November 30, 2018 Share Posted November 30, 2018 Clamps were changed Quote Link to comment
no class Posted November 30, 2018 Author Share Posted November 30, 2018 my take on so many designs...…... 12 Quote Link to comment
Askamaskinservice Posted December 1, 2018 Share Posted December 1, 2018 12 hours ago, no class said: my take on so many designs...…... That is so damn nice. Quote Link to comment
mick-ne Posted December 1, 2018 Share Posted December 1, 2018 (edited) I really cant wait to see your bike finished No Class I can only dream of having your skills Edited December 1, 2018 by mick-ne txt Quote Link to comment
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