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I've got this engine (a 1300) : which used to run on bike carbs and I'd like to do the same again. I've been over ebay and looked at what's available and there seems to be a whole variety of stuff off bikes from say 600cc to 1300. Here's the big question - if carbs from a 1300 bike work well on a 2 litre car engine, should i get them from something relatively small? I'm happy with Webers and Dells and have a fair amount of experience with them but this is new ground for me
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I'm thinking of this too ,.. As it may well be cheaper than going Twin webers...
FCR or MSR seem to be favourite with the J-Sunny guys. But I don't know much more than that..
I'm guessing its just a case of spacing them correctly on a custom manifold and plugging in the fuel line? (then jetting them *eek*)
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I thought you did it by BHP, if one set of carbs flows enough to make 170bhp on a 1.3 bike engine they'll flow enough to make 170 on a car engine of a larger capacity. I thought you needed to find a bike making roughly the bhp you wanted from your engine and go for that, for a 1.3 car motor I'd think a 600 or 750 would be enough?
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Tried giving Bogg Brothers a ring?
I've seen about £150 quoted for them to jet bike carbs and sort out a fannymould - you provide the carbs.
*n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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dp
Posted a lot
DP Race Tech
Posts: 1,044
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hotwire in da house: I'm thinking of this too ,.. As it may well be cheaper than going Twin webers
I'll second that but if you feel the need for bike carbs I would try to find a rail from a newer 750 -1000cc bike but before you buy check with a local bike shop if they can source jets for the type of carbs you are buying, if so it's quite easy to set them up with jets (that are cheap) and a good set of synchronizing clocks (also cheap stuff), it's a breeze. There are ven some real good jet & needle kits from Dyno Jet that can be used so there are a bunch of good options to get a perfect setup....
DP says: Bike carbs are for bikes but looks cool on a car......
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Last Edit: Jun 2, 2006 9:42:19 GMT by dp
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I want a VW VR6 on two sets of Triumph Triple carbs... *n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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yeah you need to consider the fact the bikes spin to much higher rpms than car engines, so as siad previously its best to look at the required power carbs off a 750 should be fine, mabe even a 1000 like an R1?
The speed triple uses injectiion does it not? As i was thinking of using a thottle body set up on a charade engine!
J
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Practical Classics did a thing on bike carbs a couple of months back, I think?
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yeah you need to consider the fact the bikes spin to much higher rpms than car engines, so as siad previously its best to look at the required power carbs off a 750 should be fine, mabe even a 1000 like an R1? The speed triple uses injectiion does it not? As i was thinking of using a thottle body set up on a charade engine! J I like the way you think, Jamesan. Am I right in thinking that bike carbs are more accepting of a blow-through application? *n
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Top grammar tips! Bought = purchased. Brought = relocated Lose = misplace/opposite of win. Loose = your mum
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There was a good article in PPC mag a couple of months ago (disappears to check back issues). March 2006 (Issue 23).
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Last Edit: Jun 2, 2006 14:49:52 GMT by moggyman
1953 Minor (Long term project) PT Cruiser
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ImpManiac
Part of things
Imps... Imps... Imps...
Posts: 868
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It's about matching air flow, which is roughly equivalent to BHP. If the engine can produce 170 BHP, say, then it is capable of flowing enough air and fuel to burn to produce 170 BHP at the crankshaft (plus thermal losses, plus friction losses...) In the case of a 1300 cc Nissan lump, I'd think that 1000 cc bike carbs or TBs would be more than ample. You might get better throttle response, low-end and mid-range torque with smaller carbs - say from a 900 cc FireBlade or even from a 750 Kwacker or Suzi, or similar. I think they are generally better in blow through applications than, for example, Webers. Some Dell'Ortos can be modified (using Esprit kits) to operate in this regime too. Personally, I am going the whole hog with my 928 cc Imp and fitting Keihin TBs from a CBR600RR later this year, along with Ford EDIS ignition and MegaSquirt. Got the bits. Just need my car back! I've got some Keihins from a FireBlade 954 cc but they'd really hurt low and mid range response, I reckon, ruining the pleasure of driving the thing! I'm
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1966 Singer Chamois sprint/hillclimb car in white over blue two tone 1975 Triumph Stag long term project (over 20 years so far) in colour TBA 2003 Vauxhall Vectra GSi 3.2 in black sapphire
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Yep easiest way is just giving Bogg Bros a call and see what they recommend for your size engine. I've got a set of R1 carbs which I'll be putting on the 1.7 16v flat four lump that I'll be dropping in my Alfasud. I can't remember off the top of my head but they mentioned certain carbs that were not only suitable but also easily changeable-as in jets etc. I found them really helpful and not at all pushy in any way as they're happy for you to buy the carbs yourself (in fact he recommended it as it would be cheaper!!) so they didn't seem biased in any way. Hopefully I'll be sending my Sud up there in Jul/Aug time for them to sort out the manifold and set the carbs up.
Jaty.
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Most of the bike carbs are constant velocity carbs, so they will work with turbocharging. The floats would have to be reinforced and all the seals made boost proof, most of that kind of stuff is available from MrTurbo and the such and like.
I too am going to distributorless ignition and injection, i need that control over the engine. Being able to know exactly what is going on is the main aim, i also fancy getting a cylinder pressure sensor so i can map combustion pressures!
J
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