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Thread: 851/888 racebike basketcase

  1. #141
    Join Date
    Jun 2011
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    S.F. Bay Area
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    67

    Default 851/888 Racebike Basketcase

    A beautiful project by the way, very inspiring, but a question. Where did you source the C/F early rear seat from? It appears very well made.

  2. #142
    Join Date
    Aug 2009
    Location
    Spain
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    Matching the wiring loom is not a problem. On the 851 you have two +12 V wires, one for the pump and one for the fuel sensor. The ST4s is different as there is one +12 V, the fuel sender being connected to earth in this case. As you won't be using the low fuel warning light, there's no problem. If you want to use it sometime, you can connect it to the only +12 V wire that feeds the pump. The only issue is that in low fuel condition when you switch the contact on the low fuel comes on as the pump primes the fuel system then off, then on agin when the engine starts turning. No problem!

    By the way, gooooorgeous bike, excellent work, mate!

    By the way, a cheap source to get the fuel pump. I bought it from this seller and it fits perfectly!

    http://www.ebay.co.uk/itm/New-Alfa-R...item35e03aeec0
    Last edited by BARONROJO; 03-09-2016 at 03:22 PM.

  3. #143
    Join Date
    Jan 2015
    Location
    Chicago
    Posts
    322

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    Quote Originally Posted by nix510 View Post
    A beautiful project by the way, very inspiring, but a question. Where did you source the C/F early rear seat from? It appears very well made.
    It is a little bit heavier than some thin cf, but extremely sturdy (and still light). I got it from webike.net in Japan. It took 2 months, but they told me it would. I got the race version with the close off rear. Not cheap, but not brutal with the weak yen to dollar.
    '01 996R, '94 888 SPO Ltd, '88 851 Adamo racebike, '91 ZX-7R K1 homologation, '89 NSR250 MC18r5k, '01 Derbi GPR50/75, '71 CB450/500 café.

  4. #144
    Join Date
    Jan 2015
    Location
    Chicago
    Posts
    322

    Default

    Quote Originally Posted by BARONROJO View Post
    Matching the wiring loom is not a problem. On the 851 you have two +12 V wires, one for the pump and one for the fuel sensor. The ST4s is different as there is one +12 V, the fuel sender being connected to earth in this case. As you won't be using the low fuel warning light, there's no problem. If you want to use it sometime, you can connect it to the only +12 V wire that feeds the pump. The only issue is that in low fuel condition when you switch the contact on the low fuel comes on as the pump primes the fuel system then off, then on agin when the engine starts turning. No problem!

    I was referring to alternative throttle body options, not the pump. But nice to know about this one. I had heard Mazda MX5. Do you know what pressure this runs? Doesn't say in the auction. I was thinking of running 3.5 or 4 bar even with the higher flowing injectors.
    '01 996R, '94 888 SPO Ltd, '88 851 Adamo racebike, '91 ZX-7R K1 homologation, '89 NSR250 MC18r5k, '01 Derbi GPR50/75, '71 CB450/500 café.

  5. #145
    Join Date
    Aug 2009
    Location
    Spain
    Posts
    342

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    Unfortunately not. I'm using an OEM S4R pressure regulator as it's a road bike. Un runs perfectly but I haven't tried another layout..

  6. #146
    Join Date
    Aug 2007
    Location
    Cornwall S.W. England
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    5,077

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    I've the later steel tank on my '92 851/916cc motor that has as standard a smaller (pattern*) pump than those fitted to the alloy tanks/Corse motors.
    I've been running at 4.5 bar for several years now with single "Green" injectors per cyclinder without any problems, my 916cc motor's only making 128 rwbhp @ 9,200 rpm 76'8 ft lbs of torque and at no time does it run out of available injector time on a full custom map.
    It also uses less fuel now than it did as a standard '92 851.
    All the Corse motors/chips were designed to run on 5 bar pressure. I'm sure that either the early Big or later small pumps are more than up to the job even when running as high as 5 bar.
    The later smaller pumps were OEM fitment on Mazda's, Toyota's and Ford Mustangs, if they can supply enough fuel for these cars, they shouldn't have a problem supplying a twin cylinder bike motor in a fairly soft state of tune.

    *The pump came with a 2 year warrenty, so I figured that if it died inside of that I'd get a new one for free...
    However it's still happily running along as good as the day I fitted it.
    I have got a spare new one tucked away just in case now though as you do.

    Steve R
    Last edited by Mr.R; 03-10-2016 at 09:24 AM.

  7. #147
    Join Date
    Apr 2007
    Location
    bakersville, NC
    Posts
    2,750

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    My '92 851 now has 64K miles on it with a 999 Testastretta engine, pink 12 hole pico injectors and the original fuel pump is still working fine and provides enough fuel. At around 30K miles when I built the original 851 engine into a 907CC engine I bumped the fuel pressure regulator up. (If I remember correctly it was 5 or 5.5 bar) (not a corse pump).

  8. #148
    Join Date
    Jun 2007
    Location
    Bris Vegas
    Posts
    3,398

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    Quote Originally Posted by nine16 View Post
    I was referring to alternative throttle body options, not the pump. But nice to know about this one. I had heard Mazda MX5. Do you know what pressure this runs? Doesn't say in the auction. I was thinking of running 3.5 or 4 bar even with the higher flowing injectors.
    All the car pumps run at 5 bar, its pretty standard sort of thing.
    Griff
    To infinity and.......

  9. #149
    Join Date
    Aug 2009
    Location
    DePere, WI
    Posts
    466

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    Quote Originally Posted by nine16 View Post
    Carbon fiber arrived. I'll have to do a little modification to the bottom mounts because of the 888 style rearsets.

    I'm figuring out tank internals to run a little higher fuel pressure. The ST4S single injectors are getting sent out for machining for higher flow. But then at least it should all be plug-and-play with the Microtec ECU.








    Keep the exposed carbon visible and have Jason paint Ducati red around the edges! WOW!

  10. #150
    Join Date
    Jan 2015
    Location
    Chicago
    Posts
    322

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    In the interest of keeping this build from becoming a complete bitsa, I had RC Engineering clean, refurbish, and bore the original ST4S injectors to increase flow from 330 to 450 cc/min at 3 bar. That should give me enough juice for 140+hp.



    Picked up all new tank internals to feed those injectors.



    Seems like the ST4S throttle bodies dont line up for the 3 piece box, so I'm going to try my hand at fabricating my own custom airbox and I've picked us the carbon fiber for that project. Well see how it turns out.
    '01 996R, '94 888 SPO Ltd, '88 851 Adamo racebike, '91 ZX-7R K1 homologation, '89 NSR250 MC18r5k, '01 Derbi GPR50/75, '71 CB450/500 café.

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