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Thread: The "What's in the AF1 shop" Thread

  1. #4906
    apriliaforum expert Axecent's Avatar
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    Quote Originally Posted by Rebelyell View Post
    Damn honda,what a bunch of sell outs to the greenies and sierra club.I will never buy a new Honda bike or car or truck of any kind honda puts out.
    It dates back to WAY before the green movement....Soichiro pretty much always hated 2 strokes....a necessary evil, in his book.
    What the Fuck, Over.

  2. #4907
    apriliaforum expert Axecent's Avatar
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    We need to fund up a research and development effort here.
    What the Fuck, Over.

  3. #4908
    apriliaforum Junkie scottydog's Avatar
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    I sometimes wondered if you could not just use a secondary injector in a throttle body for high rpm use as at that point the engine is scavenging properly while on the pipe. This ups the performance with cooling the intake charge and ensuring good fuel atomisation. If it could be timed to overlap and take over from the direct injection in the cylinder head might be possible to make direct injection work for high performance applications. I'm sure it gets complicated to map it all, but pretty sure the idea might have some merit.
    Currently

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  4. #4909
    Honest always, feared often Micah / AF1 Racing's Avatar
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    I know for sure Yamaha has experimented with a Port/DFI divided injection strategy, and gotten good results in prototype engines in watercraft.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  5. #4910
    apriliaforum expert banzairx7's Avatar
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    Quote Originally Posted by scottydog View Post
    I sometimes wondered if you could not just use a secondary injector in a throttle body for high rpm use as at that point the engine is scavenging properly while on the pipe. This ups the performance with cooling the intake charge and ensuring good fuel atomisation. If it could be timed to overlap and take over from the direct injection in the cylinder head might be possible to make direct injection work for high performance applications. I'm sure it gets complicated to map it all, but pretty sure the idea might have some merit.
    That would probably work for getting by EPA testing. They at least on cars don't test the emissions across the entire RPM range.

  6. #4911
    Back Massager Expert William the Third's Avatar
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    Quote Originally Posted by Axecent View Post
    It dates back to WAY before the green movement....Soichiro pretty much always hated 2 strokes....a necessary evil, in his book.
    The NR500 is a great bit of evidence for just how much Soichiro hated two strokes.
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  7. #4912
    apriliaforum Member Dale Zalaoras's Avatar
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    Quote Originally Posted by Micah / AF1 Racing View Post
    I did not go into detail about the SR50 Ditech for a reason. It was the first application of DFI Orbital injection in a production 2t engine and to this day lags in sophistication and reliability of the DFI system. I have considered converting one to propane to see if higher rpms are possible with the existing system however.
    I think I understand about the lack of sophistication (no O2 sensor, limited computer control, etc.). Can you give a little detail on the reliability issue?

    ------------------------
    Dale The Mad Greek Zalaoras


  8. #4913
    apriliaforum expert buck000's Avatar
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    Pardon the derail of the current discussion, but I thought Micah would dig this photograph, from here:



    Carry on.
    paul
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  9. #4914
    apriliaforum expert jrflanne's Avatar
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    That is way, major cool.

    The photographer has other images also.
    http://www.avertedimagination.com/best_1.htm
    Bikes:
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  10. #4915
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    I sure hope this isn't a repost, but it seems germaine to the topic of DFI on 2t motors. Turns out it's almost a year old article in SAE, but interesting.

    Bombardier's new DFI Rotax for the Ski-Doo. Same people that brought us the DFI 2t outboard motors.

    http://www.sae.org/mags/AEI/POWER/8157
    2008 RSV 1000 R, platinum/charcoal/red
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  11. #4916
    apriliaforum expert
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    Here's more from the Ski-Doo site.

    Click E-TEC 800R when here-

    http://en-us.ski-doo.com/technologie...hnologies.aspx
    2008 RSV 1000 R, platinum/charcoal/red
    Akrapovic full system, BST carbon fiber wheels, NERA top triple clamp, Aprilia accessory rear sets, AF1 Ti bolt kit, etc. etc...


    2008 Moto Guzzi 1200 Sport, black... and stock for now

    2007 Ducati GT 1000, red
    Showa forks, Sachs shocks, Termignoni kit, lots more

  12. #4917
    apriliaforum Member
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    I remember Nissan making DFI two stroke outboards about 5 years ago.

    http://www.nissanmarine.com/tech_talk/tldi_faqs.html#Q8

    Ray

    Anyone here own one? Any good?

  13. #4918
    Honest always, feared often Micah / AF1 Racing's Avatar
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    The problems with the Piaggio/Aprilia/Orbital/Synerject DFI on the SR50 ditech are actually fairly simple to address. Currently there are no high resolution tuning options like a PCIIIusb or anything, you can add or subtract fuel pressure for a global change of fueling. Reliability issues are really just parts issues like fuel pumps not designed to be ethanol safe, extreme sensitivity to spark plugs and index, lack of a Baro sensor and lack of sophistication in determining injection events. Basically they are very difficult to trouble-shoot, they have a few total crap parts like the fuel pump and require spark plug changes all the friggin time which is not the promise of DFI when it works right!


    Now for something different...little bitty turbochargers! The slightly larger one is a Hitachi IHI RH03B, very small but a little bigger on the compressor turbine and exhaust turbine than the KKK KP-31 pictured along side it. The red bull can is for perspective. One of these two is going to end up on a sub 300cc engine, probably in a scooter unless Aprilia brings forth the RS4!
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    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  14. #4919
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Here are some random shop pics from the last week, quite the variety of bikes in for service and dyno tuning right now...but next week see's the arrival of my newest big bore on the dyno, a 1060cc engine with squish on the tight side and a good percentage less chamber volume...should be interesting!
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    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  15. #4920
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Onto the meat of the big-bore high compression engine. Heads were bottom decked .4mm, cylinders top decked .1mm with steel liners inserted and machined by LA Sleeve. CP 1060cc standard 100mm pistons are sliding up and down in the bores, the crank is spinning the stock cams on the intake side and a set of 2003 stock intake cams on the exhaust side. Between the .1-.2mm in squish reduction and the .4mm less head thickness valve timing had to be a little different on this one with the intake lobe centers at 107.5 and the exhaust lobe centers at 109.5 degrees. Piston s and valves do indeed get close to each other but still they have a minimum distance of a little over 1.0mm at the closest. The heads are ported of course and the spent exhaust gases are exiting through a new Akro EVO6 pipe. This is a track-only build but the owner does not want everything to happen up top, more of a upper midrange missile with killer top end...let's hope this set up delivers on this goal!


    I am hoping to only get 131-133bhp on my dyno, which would make it about 3 bhp better than the next closest 1060cc engine I have built. The previous record holder was 129.7bhp at 1060cc....so friggin close!

    Pictured are the thermal sections, the engine getting ready for install and then pics from heat cycling the motor on break-in. I suspect that next week will deliver some spectacular dyno action shots from these very thin-wall racing exhaust pipes!
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    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

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