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    Thread: motorcycle carbs on 8v

    1. Member hyperformancevw's Avatar
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      08-27-2007 12:09 AM #1
      anyone have good luck with these yet? i have a set on my 8v and it rips. they are 39mm flat slides off a cbr 900. i havent dynoed it yet but i trapped 97mph in the 1/4 on a horribly hot and humid day. it pulls hard to 7500rpm. i just got it done so there is some tunning left but im very satisfied. the car is set up for road racing but if i run my slicks it definitely has a 13 in it. went a 14.35@97 with a horrible 60' of 2.4.

      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
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    2. Member hans j's Avatar
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      08-27-2007 12:42 AM #2
      I will be getting some 40mm flatslides for my 9A x-flow caddy engine. What is your setup? Those seem like some good numbers.
      Utah Imports - 858 South State SLC UT - 801-533-9600

    3. Member secondgen's Avatar
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      08-27-2007 01:08 AM #3
      That's an impressive time.

      Looks good.


    4. Member hyperformancevw's Avatar
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      08-27-2007 07:52 AM #4
      definitely love the flatslides. everyone was saying 39mm would be too small but compared to conventional carbs, there is nothing in the way of the airflow when the throttle is open. this makes it so you can run a smaller flatslide than say a webber. my set up is 9a block bored .020", JE 9.0:1 16v pistons comes out to about 12.5:1 balanced with arp hardware and stock rods, german aba head with 1mm over tt valves hand ported by me(there is no choke point from the carb to the valve), hd valve springs, titanium retainers, tt 288 cam, tt 4-1 race header, MSD 6AL and of course the flatslides. drivetrain is stock 16v even the clutch. im going to put slicks on it and wait for a cooler day an i'll see if i can get in the all motor ET list. the body is just an 87 golf gt with ac removed and lightweight seats. still has radio and everything. the engine is real tame for cruising and this car is my daily driver right now. i still manage over 25MPG!
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    5. Member hans j's Avatar
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      08-27-2007 10:36 PM #5
      How do you like the 12.5:1 compression? I have been toying with the idea of going that high but it still needs to run on 91 pump gas at 4500 ft above sea level. But I am going to run a 16v knockbox with it too.

      I also have the German ABA head but going to run stock size valves for now with any cam I can find laying around in the shop. Pretty much the carbs are the most expensive thing I am buying for the caddy, everything else is being scavenged. Even going to be mated up to the 4speed until I get the donor cabby front end torn apart.

      Utah Imports - 858 South State SLC UT - 801-533-9600

    6. Member D-Gti vr6's Avatar
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      08-28-2007 02:36 AM #6
      I have the same cabs and i would like to set up my 2.0 16v motor do you have more pick or how i could do it?

      I have a msd for spark, let all the info that you have thank you!! cool motor


    7. Member hyperformancevw's Avatar
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      08-28-2007 09:41 AM #7
      i love the compression. a lot of people have their opinions but hey it works for me and makes good power. i have run nothing but pump gas and i dont notice any detonation and the plugs look good. i have done a lot of combustion chamber smoothing. the JE pistons make me feel safer though. i havent played with the timing yet but i have it set for 36 total right now. im using the mechanical vacuum advance dizzy right now with the 6AL box so i pretty much have no rev limiter or knock control. i'm going to throw slicks on it any take out some weight for the drags next weekend so i'll keep you posted. should be deep in the 13's.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    8. Member hyperformancevw's Avatar
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      08-28-2007 09:46 AM #8
      mounting the carbs on a 16v would be easier because the ports are evenly spaced, unlike the 8v. the carbs would be very responsive on the 16v but if the motor is wild they might not be big enough. just use the stock 16v ignition because the carbs on the 16v will probably be out of steam after that anyway. thanks for the comments!
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    9. Member D-Gti vr6's Avatar
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      08-28-2007 10:31 AM #9
      thank you ,

      How do you make the vacum lines work and my engine is 2.0l 16v with some biger cams, do i need to p&p the head or would that be good?


    10. Member hyperformancevw's Avatar
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      08-28-2007 12:08 PM #10
      i just drilled out and installed a vacuum nipple in each runner and then tied them all into one line which feeds the brake booster and vacuum advance on the dizzy. you wont need a ported head for these carbs. it will be fast with cams.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    11. 08-28-2007 04:48 PM #11
      I have some Fireblade carbs sitting next to me, I really want to do the conversion, since my current DCOE 40s are crap, so I need lots of info!

      So did you change the spacing on the carbs or just build a manifold that suits their spacing?

      And any other mods to get them to work?

      I know you have to change the main jets for some from a set of Webers, and your aformentioned vacumn lines mod, but is anything else needed?

      What main jets are you running?




      Modified by chopWet at 10:49 PM 8-28-2007


    12. Member hyperformancevw's Avatar
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      08-28-2007 05:51 PM #12
      i made my own jets with a drill bit. i have a wideband o2 and a few sets of stock jets just in case i go too big. i just go a little at a time and i have had good luck. the needles and pilot jets are stock honda. the carb set is stock and i just made my manifold to fit. make sure you do all your porting before you decide on your manifold runner size. i just had a local metal shop plasma cut some flanges for me from the original manifold gasket and i ground them into shape and drilled the holes. then i chose a stainless pipe that was the same size as the carbs. my head has been severely opened up. the port is the same size as the carb throat all the way to the valve. other than that there isn't much to it. the whole project kinda just fell together and it works great. fastest all motor 4cyl i have driven and the best part is it kills ALL the local b series civics that are all motor. i will be happy to answer anything else.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    13. Member hyperformancevw's Avatar
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      08-28-2007 05:53 PM #13
      also i adapted a honda civic throttle cable and the length is perfect!
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    14. 08-28-2007 07:12 PM #14
      Quote, originally posted by hyperformancevw »
      anyone have good luck with these yet? i have a set on my 8v and it rips. they are 39mm flat slides off a cbr 900. i havent dynoed it yet but i trapped 97mph in the 1/4 on a horribly hot and humid day. it pulls hard to 7500rpm. i just got it done so there is some tunning left but im very satisfied. the car is set up for road racing but if i run my slicks it definitely has a 13 in it. went a 14.35@97 with a horrible 60' of 2.4.

      i am thinking of doing a similar set up with my 8v xflow head , how did u get the 2 middle runner to line up? if it is an adaptor wherecan i get one?


    15. Member hyperformancevw's Avatar
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      08-28-2007 08:37 PM #15
      i made it from scratch. just angle the runners out of the head untill they line up on the center two ports. the outside lines right up with a straight piece. i wish it were perfectly straight but what can you do. i dont think its affecting it very much.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    16. Member hyperformancevw's Avatar
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      08-28-2007 08:51 PM #16


      .
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    17. 08-28-2007 11:26 PM #17
      thanks for you fast response

    18. Member D-Gti vr6's Avatar
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      08-28-2007 11:59 PM #18
      Quote, originally posted by hyperformancevw »
      i just drilled out and installed a vacuum nipple in each runner and then tied them all into one line which feeds the brake booster and vacuum advance on the dizzy. you wont need a ported head for these carbs. it will be fast with cams.

      Thank you!

      what do you mean?(my own jets with a drill bit. i have a wideband o2 and a few sets of stock jets just in case i go too big. i just go a little at a time and i have had good luck)

      what is jets ?
      thanks


    19. Member hyperformancevw's Avatar
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      08-29-2007 10:28 AM #19
      the jets are little holes in the bowl of the carb that allow fuel into the carb throat. the size of the jet regulates how much fuel the engine receives. you have to match the jet size to the amount of fuel the endine needs. too small it will run lean and too big it will run rich.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    20. Member D-Gti vr6's Avatar
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      08-29-2007 11:56 AM #20
      Quote, originally posted by hyperformancevw »
      the jets are little holes in the bowl of the carb that allow fuel into the carb throat. the size of the jet regulates how much fuel the engine receives. you have to match the jet size to the amount of fuel the endine needs. too small it will run lean and too big it will run rich.
      thanks do you have any picks of the jets?

    21. Member the12for12's Avatar
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      08-29-2007 12:13 PM #21

      Gee double oh dee jay oh bee !!!!

      later,
      Thomas


    22. 08-29-2007 02:15 PM #22
      hey thanks for all the info!!

      I have read that you can also just swap the main jets from the bike carbs to those from Webers......

      Now to get mine setup too!


    23. 08-30-2007 11:12 AM #23
      Flat slide main jets only come into action at top quarter of throttle, midrange is controlled by the size and position of needle(you move a clip on the needle to a different position, upwards leaner, downwards richer, it basically controls when the main jet will kick in) and for first half of throttle it's all in the a/f mixture screw. If engine is running too rich with these carbs, it will bog down at lets say 4000rpm, if it's too lean it will let you know a lot sooner as it will have hard time starting. These type of carbs use very low fuel pressure as most are gravity fed so don't go crazy with pressure 2-3 psi the most. Oh and there is the float bowl which has a fork that controls these floats, you can bend that tab and allow more fuel into the bowl, but that is only for those who really know what they're doing. Also adding a little bit of high quality 2 stroke oil as a premix to your tank will keep flatslides smooth , and keep them from seizing(16:1-10:1 premix ratio). Balance and lighten your engines when using these as they rev up a lot quicker than fuel injected motor. These are practically impossible to synchronize, so the best you can do is have each one set exactly the same. I'll be doing this for my winter project, using a 2l aba motor with most probably yamaha R1 slides.

      Great work by the way, I'm now truly inspired to finalize my project, post some more info on your setup.

      How do they feel on the exit out of sharp turns??? Do you feel any "choking" in the engine or is it just smooth acceleration?


    24. Member the12for12's Avatar
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      08-30-2007 05:29 PM #24
      ^^^^^^^^^^

      added to FAQs


    25. Member hyperformancevw's Avatar
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      08-30-2007 09:21 PM #25
      i dont have any screw adjustment on my carbs. the only thing that controls the fuel is the pilot jet for low speed and the main jet for high speed in combination with the slide needle. if i want to change low speed fuel i have to change the size of the pilot jet. it doesnt bog at all on acceleration or aroung corners. i have tested it through the corners and it does really well. it actualy performs better than the original cis. for fueling i am using the transfer pump to grt it to the carbs with a $35 mr. gasket dial regulator set at 5psi. i will be attending H20 so anyone who wants a ride feel free to check it out.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    26. 08-31-2007 09:26 PM #26
      Even better, makes it much easier to get it running, but less tunable. I'm using dellorto as reference, they;re a bit more performance oriented and a lot more tunable, just like DCOE webbers... you have four jets, a needle valve, and emulsion tubes and different thickness needles...

      For real crazy performance flatslides check out Keihin FCR series, they have four bearings on each slide, and also have a built in fuel pump, infinitely tunable.


    27. Member hyperformancevw's Avatar
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      08-31-2007 10:42 PM #27
      for what im doing i like my carbs. i paid only $75 for them off ebay so im happy. keep us updated when you start to build your set up this winter!
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    28. Banner Advertiser Forge US's Avatar
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      08-31-2007 10:47 PM #28
      I'm going to be putting some old 32mm Mikuni CV barrel slides on my 1.3 8v.




      Modified by Mike@ForgeMotorsport at 10:50 PM 8-31-2007


    29. Member hyperformancevw's Avatar
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      08-31-2007 11:11 PM #29
      nice. those 32's will be perfect for the 1.3. what other mods are you doing? im so impressed with my carbs i have a smaller set of round slide carbs i'll probably put on my caddy with a stock aba with a cam. post some pics as you go!
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    30. 08-31-2007 11:11 PM #30
      I didn't say you shouldn't be happy dude, I'll probably end up using the same type of carbs just because they're reliable and don't need to be maintained so often. I'll post a pic for you guys in a couple of days.

    31. Member hyperformancevw's Avatar
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      08-31-2007 11:15 PM #31
      no problem at all man. i didnt take offense to anything i was just lettin you know i was good on the carbs.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    32. Member D-Gti vr6's Avatar
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      09-01-2007 12:49 AM #32
      i sold those carbs to they where working great on my friend rabbit

    33. Banner Advertiser Forge US's Avatar
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      09-01-2007 01:38 AM #33
      Quote, originally posted by D-Gti vr6 »
      i sold those carbs to they where working great on my friend rabbit

      Yea, that's your hand in the photo!

      Originally, we were unsure of the age of the carbs, but I think I've dated them back to around a late 70's early 80's Yamaha.

      They and the motor are going to be fully rebuilt, but I'll be keeping the stock 1272cc displacement. I might up the compression slightly, but it will definitely be getting a cam and some head porting too. This may even involve sending the motor back to Germany to be built by Sorg Motorsport, one of the few companies that specializes in the smaller 8v's.

      If I can pull it off, I'd like to swap on an 085 5-speed transmission from a G40 Polo (the only that fits this setup) as opposed to the 084 4-speed it has right now, and then everything else on the motor will be replaced or refurbed and I have a good number of other custom touches planned too.


    34. Member hyperformancevw's Avatar
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      09-01-2007 11:09 AM #34
      sound like fun. nice to see something original.
      -87 Golf GT, built BT 1.8t 12.02@119 1.96 60' HX35@18psi pump gas (sold/parted out)
      -64 ratty bus "the slamper"
      -91 Jetta ALH TDI swap
      -80 diesel caddy
      -76 BMW 2002

    35. 09-02-2007 03:21 AM #35
      don't the bike carbs have an overflow at the bottom? I suppose its not as much of a problem on a crossflow but on a U flow?

      I'm getting my manifold made up this week, can't wait! for all the info


      Modified by chopWet at 9:25 AM 9-2-2007


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