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Thread: Robl Engineering Prototype Intake Completed

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    Pro-X troybilt's Avatar
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    Robl Engineering Prototype Intake Completed

    Here is some pics of my prototype intake designed SPECIFICALLY for the TRX250R, with 38 and larger carbs, also uses the MUCH larger 06plus TRX450R filters. Dyno work and flow bench testing to come soon.

    Progress!

    10500426_818917114873090_4992443236739990065_n.jpg11227899_818907934874008_6914205924734011033_n.jpg11745904_818917101539758_2650154105254320099_n.jpgIntake2_render03.JPGIntake2_render02.JPG
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    Elsinore 496cc Saber

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    Pro-X JesseA420's Avatar
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    sweet! im excited to see results.
    Quote Originally Posted by Hawaiiysr View Post
    Yup i sucked the head. taste like dirt.

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    Supporting Member Pumashine's Avatar
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    Quote Originally Posted by troybilt View Post
    Dyno work and flow bench testing to come soon.
    Are you making these soon or are you just testing the one you have? Thanks, Troy, I am looking for one for the minitooth to attach to the smart carb
    Puma 408, Puma 431, Pilot 412, Puma 431, Mini-tooth 486 Trx450r
    89mm Mini tooth Shearer in frame pipe chromed! Mounted with Cascade QUIET Silencer
    All motors built by Pete at hybrid 360-281-2274 SIMPLY THE BEST PORT TIMINGS AVAILABLE
    Looking for Bling? http://www.tlr-online.com/trx250r/dress_up

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    Pro-X rk88r's Avatar
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    Cool
    '99 Laeger narrow, cr link, +3+1 protrax, Peps, with a LED 363
    '88 265 pv peps
    One other '88

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    Pro-X troybilt's Avatar
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    Yes fairly soon as in fall time frame. The CF will be sooner then HDPE to follow
    Elsinore 496cc Saber

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    Administrator havinnoj's Avatar
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    Nicely done Troy! Looking forward to seeing results and pricing.

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    Rider
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    What ever happened to the KX 500 powered quad? Sorry to hijack just curious

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    Pro-X troybilt's Avatar
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    It's still sitting on my work bench. That's my Bro-in-law's bike and he needs to get back in high gear on it!
    Elsinore 496cc Saber

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    Pro-X Hawaiiysr's Avatar
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    You sir are doing some cool stuff

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    Racer StrokedAZ's Avatar
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    Looks sweet! Is this gonna work with a stock airbox?

    Sent from my Galaxy S5
    86 TRX 250R

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    Pro-X troybilt's Avatar
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    This will work with my Aluminum airbox. I'll have to do a different intake to work with the stock box. Doable forsure.
    Elsinore 496cc Saber

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    Pro-X troybilt's Avatar
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    The airbox will mimic this design I have for the TRX450R. Nice thing about this box is you can run it as an "airbox eliminator" or as a complete airbox, I think an airbox that can be configured for different riding conditions is key. To start they will be vented as shown. I'm working with another company in the snowmobile world that makes hydrophobic mesh, so the vents will be covered with this mesh. Looks like outerwears material except it doesn't let water, mud or snow in.


    Modular_box.JPG
    Elsinore 496cc Saber

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    Super Moderator Tbone07's Avatar
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    I would love to test one of these out asap. Wonder how well it would fit my no-link
    LED Performance 350 Sphynx - XC Machine
    Laeger's-Roll-GThunder-HLS-PEP-HiPer-GBC

    RIP Lazarus Sommers

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    Racer StrokedAZ's Avatar
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    That airbox looks awesome as well! Might need to get the package deal when your done

    Sent from my Galaxy S5
    86 TRX 250R

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    Administrator havinnoj's Avatar
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    Side note - all posts relating to the detour on Photobucket images not displaying can now be found in their own thread located here:
    Images Not Showing Up In Thread - Settings Option to "Show Images".

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    Sphynx rablack21's Avatar
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    Good work Troy. Looking forward to getting one.

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    Racer
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    Now this is awesome progress Troy! Great to hear.
    Quote Originally Posted by troybilt View Post
    The airbox will mimic this design I have for the TRX450R. Nice thing about this box is you can run it as an "airbox eliminator" or as a complete airbox, I think an airbox that can be configured for different riding conditions is key. To start they will be vented as shown. I'm working with another company in the snowmobile world that makes hydrophobic mesh, so the vents will be covered with this mesh. Looks like outerwears material except it doesn't let water, mud or snow in.


    Modular_box.JPG

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    Supporting Member Pumashine's Avatar
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    Big pain in the azz is the smart carb. The intake tube must be 3/4" shorter to use the stock airbox or that configuration. It has to do the the mounting tabs on the stock frame. Not easy to move 3/4"

    A specail thanks to Troy for doing all this R&D. I am sure he has a thousand hours into THIS
    Puma 408, Puma 431, Pilot 412, Puma 431, Mini-tooth 486 Trx450r
    89mm Mini tooth Shearer in frame pipe chromed! Mounted with Cascade QUIET Silencer
    All motors built by Pete at hybrid 360-281-2274 SIMPLY THE BEST PORT TIMINGS AVAILABLE
    Looking for Bling? http://www.tlr-online.com/trx250r/dress_up

  19. #19
    Racer
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    Awesome work. Looking forward to seeing the results on this. Some of you guys are doing great things to keep our beloved bikes alive. Is this made from the same materials as the oem boots or a different material?

  20. #20
    Pro-X troybilt's Avatar
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    UPP out there in Tony's neck of the woods does the polyurethane rubber stuff for me. When I had my 496cc Saber motor, the intake signal would nearly collapse the rubber intake tubes. I can do PU material (similar to stock), the issue I found is its not as cost effective as high density plastic or even Carbon fiber. With the plastic the filter can clamp directly to the tube, versus having some billet aluminum flange made. However, to work with stock airbox the PU would be the way to go off course. Thing to remember is this isn't just a stock replacement intake tube, this actually will give a big bump in performance. The one I've done for the yfzr was nearly 2-2.5hp improvement, and still finding more. I have my own dynojet dynamometer so I will know exactly what improvements can be made.

    Also intake pulses are timed just like on the expansion chamber side. Key is getting the earliest intake pulse to return to the intake side of he cylinder around the same time as when the piston just drops past the intake ports, (volumetric efficiency). Again, just like the expansion chamber side, Length, taper and volume of the intake tube factor into this, and can change whether an intake is low, mid or top end range, etc... With that said, even with all the various methods or equations for calculating this it gets fairly complicated cause the intake tubes are rarely just a simple tapered pipe, they have kinks and bends and large transitions etc... Even with the engine simulation software I use, it assumes the intake is a simple tapered pipe. I've read some interesting papers on this topic where an oscilloscope and a microphone was used measure the pulse timing. I've thought about getting some of that equipment and trying it myself. For now I do "best" guess then hit the flowbench and dyno, but I'd like to have a more scientific approach to it. I do have a kickass Somat data aquisition computer, that I'm working on installing ultra high speed pressure transducers in the intake tube coupled with an analog rotary gauge. I'd like to be able to plot intake pressure vs. crank angle. This is very doable and I just need a little more time to get this all figured out.
    Elsinore 496cc Saber

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