blakep82
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| posted on 14/11/07 at 11:41 PM |
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which bike carbs or TBs?
ok, been asking a lot of people on a lot of different forums, and decided to go with the vauxhall ecotec 2.0 (x20xev) which i'll probably get
shot down for 
been looking for carbs/throttle bodies to run on it (although i'll start by running it standard for a bit)
question is, what bike carbs or throttle bodies should i use? what should i look for? how do you decide what bike engine to take them from?
bike carbs are a lot cheaper than say webber carbs, and seem to offer the same power. what bikes use injection throttle bodies?
haven't got my engine yet, just looking into the options, though i am hoping to go see some breakers this weekend to look for one
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takumi
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 posted on 15/11/07 at 08:50 AM |
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I would go with big bike carbs, for simplicity and value.
On a 2L Ecotec, I would go for 38mm+ , look for 750cc+ Super Sports bike like the ZZR, Fireblade, GSXR
No need for any high pressure pump+filter or swirl pots, nice and simple.
The only hindrance is the need for a stub manifold, either DIY-cheap or Bogg Bros-expensive.
I'm going with bike carbs on my zetec conversion (eventually!) 38mm Keihins, with Megajolt Ignition control.
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coozer
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| posted on 15/11/07 at 09:02 AM |
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I picked ZX9R carbs for the 40mm choke and TPS... dead cheap off ebay.
If you don't want the TPS then ZZR1100 carbs are also 40mm.
I used teh ZX9r fule pump and a filter. Thats it, dead esy, it runs and ticks and I haven't done any re-jetting yet...
1972 V8 Jago
1980 Z750
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02GF74
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| posted on 15/11/07 at 10:21 AM |
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quote:
Originally posted by blakep82
bike carbs are a lot cheaper than say webber carbs, and seem to offer the same power. what bikes use injection throttle bodies?
yes cheaper to buy, assuming you have the required internals, if not, changing th insides: choke, venturi, jets, emulsion tubes etc: alone will be in
excess of 200 
TBs have the advantage that you don't need to pay anyone to tune them - unless someone correctlyly me, MEgasquirt can self tune itself using an
oxygen lambda sensor and you can tweak stuff if you know what you are doing yourself.
you can't do that with bike carbs so a bit more hit and miss ubless you pay for rolling road. then over time parts wear so you would need to
repeat the porcess so although EFI seems more expensive at the beginning, I reckon in the long run it works out cheaper.
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takumi
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| posted on 15/11/07 at 09:01 PM |
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Humbug.
Bike carbs are cheap and cheerful, easy to setup, better fuel economy than DCOEs, lighter! less parts, very simple to rebuild.
All you need to do to get a half decent setup is change the main jet (bikes generally run leaner than old car engines) to somthing like 1.7mm and
you'll be flying. I bought a 1.7mm drill from a model shop and dit it myself.
go bike carbs!
[Edited on 15-11-07 by takumi]
RobinHood 2B 2.0i pinto, Keihin 38mm Carbs, lightened flywheel, O'Mori remote filter kit, 10 row oil cooler. Modified head, 10.2cr, special
valves FR22 cam, 4- 1 header.
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blakep82
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| posted on 15/11/07 at 09:33 PM |
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Bike carbs it is
just wasn't sure what size bike engine i'd be looking at. saw a few sets of bike carbs on ebay pretty cheap. setting up may be a mission,
but worth it i think.
means i can strip loads of the intake crap off the engine
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blakep82
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| posted on 15/11/07 at 09:40 PM |
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thoughts on these?
Click, coz ebay links don't seem to work here
and are these (from a 1100 engine) too big for a 2.0 car engine?
and here
[Edited on 15/11/07 by blakep82]
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Jenko
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| posted on 16/11/07 at 09:22 AM |
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One thing to consider is the actual choke sizes of weber carbs.....for a 2ltr engine a 34mm choke is normally enough (unless you then start tuning
it).....Many bike carbs have a self adjusting choke, but I would go for the smallest body size....GSXR600 are 38mm, and can be spaced......
Also, would advise going down the megajolt route for ignition......
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blakep82
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| posted on 16/11/07 at 06:42 PM |
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I was planning on going megajolt too
how do you mean the choke is self adjusting? would a carb from a 600cc bike be enough? or should i be going for 750+cc?
i do plan on tuning, although it will be standard to start with
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jacko
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| posted on 16/11/07 at 07:47 PM |
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I have zx9r carbs on a 2.1l pinto there 40mm chokes and tps for your megajolt
Jacko
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blakep82
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| posted on 16/11/07 at 08:19 PM |
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zx9r it is then
going looking for an engine tomorrow
how about this
this one
[Edited on 16/11/07 by blakep82]
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blakep82
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| posted on 18/11/07 at 04:46 PM |
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just got a set of zzr1100 carbs off ebay. £21
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r1_pete
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| posted on 18/11/07 at 06:50 PM |
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Full power or restricted zzr1100? if the tops have a raised bit in the middle they're restricted - slides won't go all the way up. Flat
tops = full power.
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blakep82
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| posted on 18/11/07 at 07:38 PM |
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er, don't know actually. didn't know there was a difference...
these ones!
if they're not full power ones, is it as simple as swapping the tops for flat ones?
think at havong a go of
these too
for keeping which ever aren't as good for spares
[Edited on 18/11/07 by blakep82]
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r1_pete
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| posted on 18/11/07 at 07:48 PM |
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can't tell from the pics which yours are, the second set are deffo restricted.
Yes just swap the tops, ZXR750 tops do the job, but you'll pay as much for tops as carbs.
these are what the flat tops look like
 
Rescued attachment ZXR750carbs.jpg
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blakep82
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| posted on 18/11/07 at 07:52 PM |
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Yeah, can't tell by the picture... restriced will do for now though. if its just a case of swapping the tops, then i can always do this later.
if i get the other set, i've got a spare set of tops to 'modify' or hack them up, bin them, then replace with the other set
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