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Thread: ESE's works engine tuner

  1. #39226
    Join Date
    2nd November 2023 - 23:26
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    yamaha rd350A 1974
    Location
    east yorkshire uk
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    56
    Quote Originally Posted by skako View Post
    Hi,
    I tried to adapt the wobbly pipe, #39123, designed for aljaxon to LT= 825mm for my model.
    I adjusted the pipe to have the same inlet for a better comparison.
    I tried to keep the angles and dimension ratios as much as possible.
    I was interested in how close I am to the characteristics of the wobbly pipe, which can be seen on the graph.
    I assume that aljaxon could expect a similar characteristic on his moped at lower RPM.

    Attachment 354396
    out of the 5 pipes ive made since october for this bike the lower "fat" one is the best pipe. stupidly fat 4.7 x belly to ex port area. using the wobbly duct geometry to start things off. ive left the dims off the lower pipes first part but they are the same as the above pipe. the too sharp rear cone doesnt mess things up because i am told the energy has all been used up by the diffusers sharp angles. its annoying because when i stick to the "rules" i get a lesser pipe.



  2. #39227
    Join Date
    13th April 2022 - 19:08
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    None
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    Florence, Italy
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    holes for squish band cooling

    wob, i have a question regarding the tm head insert with squish band cooling that you posted some time ago.
    You said that this gave a slight improvement, bringing the water near the squish but keeping the chamber hot.

    but isn't the water substantially stagnant inside the holes? also in a rapid cfd simulation this is what looks more likely.
    Wasn't it better with a continous 3-4mm groove around the same zone? maybe that might have caused some structural issues?

    thanks!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #39228
    Join Date
    15th December 2022 - 06:58
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    Tomos BT50
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    Croatia, Virovitica
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    Quote Originally Posted by philou View Post
    skako, you can test this one ?
    .................................................. ...............................
    I need more info in my inbox.

  4. #39229
    Join Date
    8th February 2007 - 20:42
    Bike
    TZ400
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    tAURANGA
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    3,862

    Squish Band Cooling.

    The water is forced to flow around the annular ring above the drilled cooling holes.
    Heated water in the holes naturally migrates toward the cooler water above and is being continuously recycled.
    The annular ring is a compromise between beam strength and water flow capability.
    This setup gave substantially less background deto level on the dyno , and on track allowed probably 2 jets or 30*C extra egt without deto.
    Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.

  5. #39230
    Join Date
    18th May 2007 - 20:23
    Bike
    RG50 and 76 Suzuki GP125 Buckets
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    Auckland
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    10,466
    Quote Originally Posted by wobbly View Post
    Just for info I discovered Avejas is advertising his deto knock sensor box again on Ebay - havnt seen it for ages.
    Ive used dozens of the things for over 10 years , they work perfectly.
    You can order the 0-5V output for data logging - as well as add an ouput that shorts to ground when deto is happening.
    This is great with an Ignitech input that retards a setable amount when its grounded.
    The Bosch sensor with an 8mm hole can be got for nothing from wreakers or new on Ebay as well.


    https://www.ebay.com/itm/18573910441...3Avlp_homepage
    Quote Originally Posted by aljaxon View Post
    would this work with say an rd350A with powerdynamo (vape) ignition? or even a single cylinder moped? im not that bothered if it doesnt do the retard under grounding with every ignition stystem. as long as i get a good early knock detection in order to have enough time to shut off. where does the sensor get mounted? cyl cyl head or crankcase?
    Click image for larger version. 

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  6. #39231
    Join Date
    25th March 2004 - 17:22
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    RZ496/Street 765RS/GasGas/ etc etc
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    Wellington. . ok the hutt
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    As you were. I'd thought there was problems with Air-cooled. I'd modded to water cooled for everything by then.
    Still have to make special head bolts and be careful with torque evenly.

    Sorry if I put you crook.
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  7. #39232
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    13th April 2022 - 19:08
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    Quote Originally Posted by wobbly View Post
    The water is forced to flow around the annular ring above the drilled cooling holes.
    Heated water in the holes naturally migrates toward the cooler water above and is being continuously recycled.
    The annular ring is a compromise between beam strength and water flow capability.
    This setup gave substantially less background deto level on the dyno , and on track allowed probably 2 jets or 30*C extra egt without deto.
    thanks, on cfd it's not easy to weight the natural convection from the holes to the upper cool flow, but you absolutely have a point here.

    Have you tried the deeper annular ring solution? maybe half the depth of the holes for example.
    Is it really critical from a strenght perspective? worth trying?

  8. #39233
    Join Date
    7th October 2015 - 07:49
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    honda ns 400
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    Lithuania
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    466
    Tested this similar squish cooling type, but without holes. Flow rise up from the cylinder and then arranged down to squish area by cover deflector and then rise to outlet near spark plug.
    Both piece made from 7075, but still not cracking.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #39234
    Join Date
    6th February 2012 - 08:54
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    1988 cagiva freccia
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    france
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    197
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    1
    a test of Mota simulator automatic exhaust optimization feature.

    this could be an additional function to bring to engmod





  10. #39235
    Join Date
    3rd December 2011 - 23:33
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    2005 aprilia rs50
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    UK
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    81
    Quote Originally Posted by philou View Post
    a test of Mota simulator automatic exhaust optimization feature.

    this could be an additional function to bring to engmod




    Hi,

    Just to note: the pipe in the latest video at Mick's isn't the same as the one in the video about the Mota optimiser. I'd like to build that one at some point to see how the inverse baffle will work in reality.

    Cheers

    Dave

  11. #39236
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    8th February 2007 - 20:42
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    TZ400
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    tAURANGA
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    Inverse angle rear cones have never worked , unless its some very very weird application or particular effect being sought.
    A generality I know but I tried several variations in Dynamation before Neels came along.
    This geometry makes a high amplitude return wave very early in the plugging process with the piston closer to BDC where it should be still evacuating.
    Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.

  12. #39237
    Join Date
    15th December 2022 - 06:58
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    Tomos BT50
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    Croatia, Virovitica
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    Quote Originally Posted by philou View Post
    skako, you can test this one ?

    Ιdit : 13 mm leak tube for 50cc o_0 it will break. the oil film in the cylinder will burn on the exhaust side
    Hi,
    Here I tried to adapt Philou suggestion.
    The simulation and the drawing for comparison are on the graph.
    Click image for larger version. 

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    I also tried to adjust the A.I. pipe design for my 50cc model. Simulations for comparison are on the graph.
    Click image for larger version. 

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    I still think that the FOS pipe can be adjusted well for engine.

  13. #39238
    Join Date
    25th March 2004 - 17:22
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    RZ496/Street 765RS/GasGas/ etc etc
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    Quote Originally Posted by rgvbaz View Post
    Hi,

    Just to note: the pipe in the latest video at Mick's isn't the same as the one in the video about the Mota optimiser. I'd like to build that one at some point to see how the inverse baffle will work in reality.

    Cheers

    Dave
    So why still the low revs?

    Old road 125s did 25hp and managed 100mph. To do it with only 20 you'll need a great fairing and tiny rider I'd expect with spot on gearing and some luck.

    Or, just attn to the crank bearing /rod choice and rings that cope with the revs without fluttering, push revs up 2000 rpm and 25hp will be easy. You're not building a high mileage bike are you?
    I've been told. Dreaming`s free.
    Think I'll go, back to sleep.
    Everybody listen, voices in my head
    Everybody listen, do yours say, what mine says?

  14. #39239
    Join Date
    3rd December 2011 - 23:33
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    2005 aprilia rs50
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    UK
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    Quote Originally Posted by F5 Dave View Post
    So why still the low revs?

    Old road 125s did 25hp and managed 100mph. To do it with only 20 you'll need a great fairing and tiny rider I'd expect with spot on gearing and some luck.

    Or, just attn to the crank bearing /rod choice and rings that cope with the revs without fluttering, push revs up 2000 rpm and 25hp will be easy. You're not building a high mileage bike are you?
    Hi Dave,

    Yeah, I'm certainly not there yet. Going by the previous attempt in Practical Sports Bikes I need at least another 3-4 hp. They had real issues pulling top gear so I'm contious of moving peak too high and reducing the power range.

    I'll have a look at the STA available at a higher rpm.

    I'm currently on a dykes ring piston. I'd like to swap to something single ring but the 12mm piston pin and 54.5mm bore are an issue. I do have a early RM rod that will fit the crank and would use a 14mm piston pin piston (CR125 1984?)

    So many different things to try πŸ˜€


    Cheers

    Dave

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