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Thread: ESE's works engine tuner

  1. #39736
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    13th April 2022 - 19:08
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    Quote Originally Posted by adegnes View Post
    Barikit PE-65, 0.8mm ring, ring gap centered over C port, 12mm wrist pin.
    24.5mm compression height, 100mm dome radius.
    Emot Racing has them sometimes, VRM in Sweden too. VRM just got more in stock.
    hello alex, just for your info, I bought a malossi 34.8544 piston with 25mm compression height and 134 dome radius (circa- measured with the comprator on the cnc machine). It weights 74g, but using the barikit pin which has the conical shape of the hole, I dropped it to 71,4g. This is a 5,6 grams gain over the barikit kit. Not bad for a 50cc

  2. #39737
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    23rd September 2014 - 19:35
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    Quote Originally Posted by Gradella23 View Post
    hello alex, just for your info, I bought a malossi 34.8544 piston with 25mm compression height and 134 dome radius (circa- measured with the comprator on the cnc machine). It weights 74g, but using the barikit pin which has the conical shape of the hole, I dropped it to 71,4g. This is a 5,6 grams gain over the barikit kit. Not bad for a 50cc
    Nice! What thickness is the ring on that piston, and what sizes does it come in?
    Check out my YouTube channel! - 2STROKE STUFFING -
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  3. #39738
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    23rd September 2014 - 19:35
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    I just discovered small RC hydraulic gear pumps is a thing.
    https://goldlandrc.com/product/10mpa...lian-oil-pump/
    Click image for larger version. 

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    Could maybe be used for electromechanical continuous fuel injection.
    May not even need a barrel valve as the pump is independent from engine rpm.

    I've ordered one, will give it a try. Already got some water injection nozzles that should work.
    Will be tested independently on a known good engine this time
    Check out my YouTube channel! - 2STROKE STUFFING -
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    Two strokes & rum!

  4. #39739
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    15th May 2017 - 14:26
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    Quote Originally Posted by wobbly View Post
    My first reaction to the huge Density Altitude variations is that a Lectron is affected by this less than 1/2 a normal carb.
    And several guys running Pikes Peak have used a simple hand operated lever to adjust a screw in PJ and watched the EGT during the run to keep it on the money.
    But a way cleverer way is that used by Tillotson for their pumper carbs - they use a servo setup from the RC car world with either +/- on board buttons or even remote control for
    the screw adjusters.
    Even one step cleverer again would be to use the 0-5V RAD output from a digital weather station , programmed thru an Arduino or Raspberry device to auto correct the real time EGT input by controlling
    the PJ servo on top of the carb.
    Wobbly

    Which model carb would you choose to use?


    Sent from my iPhone using Tapatalk

  5. #39740
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    8th February 2007 - 20:42
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    Fly , depends upon the engine config and the end use.
    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.

  6. #39741
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    18th March 2004 - 17:38
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    Fly, I must say the more I find out about the lectrons. The more impressed I am with them. Especially with the modern ones.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

  7. #39742
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    25th March 2004 - 17:22
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    Ooh, let's play this game in reverse.

    How about one of those tubes types where you wind a fuel damp wick into the airstream?
    Don't you look at my accountant.
    He's the only one I've got.

  8. #39743
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    Quote Originally Posted by adegnes View Post
    Nice! What thickness is the ring on that piston, and what sizes does it come in?
    1mm ring, starts from 39.93 sel. 0 to 39.97 on sel. C, but at the moment it looks like the only two available are A and B (from 39.94 to .96)

  9. #39744
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    23rd September 2014 - 19:35
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    Continuous high pressure injection could be the ticket for higher nitromethane percentages. Better atomization, less fuel just passing through the engine unburnt.

    Variated landspeed bike is a special use case. I need to be able to climb from somewhere early in the powerband to peak power rpm once, then steady state WOT at peak power rpm for 5km or so.
    Check out my YouTube channel! - 2STROKE STUFFING -
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    Two strokes & rum!

  10. #39745
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    20th January 2010 - 14:41
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    Quote Originally Posted by F5 Dave View Post
    Ooh, let's play this game in reverse.

    How about one of those tubes types where you wind a fuel damp wick into the airstream?
    everyone's wanting to build a better mousetrap...





    Kinky is using a feather. Perverted is using the whole chicken

  11. #39746
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    18th March 2004 - 17:38
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    Quote Originally Posted by husaberg View Post
    everyone's wanting to build a better mousetrap...


    I have have personally come a cross rats that I think would not be phased by a direct hit by the gun one.
    Compare Pornography now to 50 years ago.
    Then extrapolate 50 years into the future.
    . . . That shit's Nasty.

  12. #39747
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    18th May 2007 - 20:23
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    Quote Originally Posted by adegnes View Post
    Continuous high pressure injection could be the ticket for higher nitromethane percentages. Better atomization, less fuel just passing through the engine unburnt. Variated landspeed bike is a special use case. I need to be able to climb from somewhere early in the powerband to peak power rpm once, then steady state WOT at peak power rpm for 5km or so.
    My previous limited experience with a two stroke and Nitro on the dyno. Is that, it was good for additional low down torque and for filling in the hole just before getting up on the pipe. Once the engine started coming anywhere near maximum torque it was best to stop adding nitro. It sure looked like it would give the bike some extra lift coming out of corners. A real power band widener. It would be interesting to adjust the engines compression/ignition properly for Nitro. Maybe I will try it one day.

    Quote Originally Posted by TZ350 View Post
    .
    NITRO METHANE
    .
    Too days dyno experiments were with my Suzuki RG50 powered Bucket Racer and raw Nitro.

    I have always theorized that with a correctly jetted two stroke running properly on race gas or similar one can just squirt raw Nitro Methane into the bell mouth and you will see a power increase with out any air fuel mixture issues. The reason is, that raw Nitro carries just a little more fuel than oxygen so as well as adding oxygen for more power it effectively richens the ingested mixture too.

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    The experiment was a bit crude. Just squirted the Nitro in. Blue line is Av Gas only and correctly jetted for max power. The red line is with Av Gas and Nitro squirt. The red line shuts of early as it goes over rich. For Nitro to be useful you would need ignition and mixture control. So the conclusion is that with a digital ignition and power jet control Nitro could be a very viable option, pity Nitro is illegal in our racing class.

    But anyway if you have ever wondered if Nitro could be a good thing with two strokes then this experiment suggests there are real possibilities there.

  13. #39748
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    12th March 2011 - 02:31
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    So could a switched PJ be used to add the nitro at the desired RPMs?
    I could see adjusting timing to coincide with the nitro but compression would be a bit beyond me.

  14. #39749
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    20th April 2011 - 08:45
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    Quote Originally Posted by TZ350 View Post
    pity Nitro is illegal in our racing class.
    Pity?
    My limited experience with nitro dates from testing a blown dragster on nitro as technical editor / testrider for Moto73 in 1976.
    My most vivid memory after all these years is not the acceleration, but the hellish pain when you get nitro fumes in your eyes.
    I suppose inhaling the stuff can't be very healthy either. And if you don't care about the corrosion in your lungs, think about the corrosion in your engine.
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  15. #39750
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    28th August 2015 - 00:01
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    We run nitro on glow ignition race engines. It really helps the smaller engines (2.5 cc) where 66% nitro is common. I ran 60% nitro on all my engines, but the consensus for engines over 10cc was 50% is plenty. We did some limited testing on 26cc ignition engines. They ran fine on 15% nitro standard fuel, but burned the electrodes off the plug, denting the piston on the way out, on 40% nitro. We did a series of fuel tests on a 26 cc engine setup for gasoline. We only changed the needle settings to best power for the various fuel mixtures. All this convinced me that fuel cheating in our racing wouldn't matter and extensive fuel testing like that used in larger racing classes wouldn't be needed. See the test results below.

    Lohring Miller

    Click image for larger version. 

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