funkyhunk
Part of things
Old Ford's R Us
Posts: 265
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Sept 10, 2011 0:06:50 GMT
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Hi, I'm currently contemplating firing up a 2.1 Pinto with large valves and fast road cam on bike carbs.
I came across some barbs from a Bandit 1200 rated at 135bhp for little to no money the other day, and thought it would be fun.
But, I was wondering about a few things.
How is the vacuum for the brakes, ignition retard and stuff like that connected when you have 4 individual throttle bodies with no other connection between them than the inlet flange?
Do they connect through 1 inlet, 2, or a line from all four running to a common connection?
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Copey
Posted a lot
Posts: 2,845
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Sept 10, 2011 0:19:12 GMT
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you can do it 2 ways, connect up all 4 outlets with T's or make a lil pot that has all 4 carb vacs along the bottom, outlet for dizzy one end and outlet for brake servo other side
i did it the first way with no problems, but the 2nd way is the ideal way!
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Last Edit: Sept 10, 2011 0:19:51 GMT by Copey
1990 Ford Sierra Sapphire GLSi with 2.0 Zetec
1985 Ford Capri 3.0 (was a 2.0 Laser originally)
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rtlkyuubi
Posted a lot
Low and Slow
Posts: 2,922
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Sept 10, 2011 4:20:51 GMT
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funkyhunk
Part of things
Old Ford's R Us
Posts: 265
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Sept 10, 2011 12:32:09 GMT
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Thanks for the explanage dudes!  |
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Sept 29, 2011 22:03:21 GMT
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so whats the power gain from using bike carbs? rather than using the origional carb and up jetting? main question really is it worth doing? i'm considering this for my micra k10 1.0l, my plan is to build a 1.2 engine and sqeeze as much power out of it as posible, hope you can help.
moz
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If it's broke... fix it! If it's not broke... fiddle with it!  |
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Sept 30, 2011 0:39:33 GMT
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Well mainly because you have one choke per cylinder.
Go from a standard carb of, say, 32mm choke diameter (1.25", reasonable assumption for a Micra) to 4 bike carbs of 32mm diameter each obviously means 4x the intake area = 4x the air flow = LOTS more power ;D
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1989 Peugeot 205. You know, the one that was parked in a ditch on the campsite at RRG'17... the glass is always full. but the ratio of air to water may vary. |
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Sept 30, 2011 11:51:09 GMT
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You get four direct inlet paths of nearly or exactly equal length, instead of one carb having to feed four tracts.
And a lot of tunability in each carb; pilot, needle, mains, air bleeds, springs, etc.
Well tuned they should have a snappy throttle response.
You do get more potential total airflow but the main thing is the inlet/distribution and fine tuning. The 'more air in total thing' isn't itself adding to power, the motor draws the amount of air it wants/is able to, but you do have the potential to hop the engine up and the carbs be able to feed it.
Re the 'hp rated' thing, main thing is carb size/venturi size. e.g. I've put 750 carbs (85-90hp bike) on 1100s and on a 1260 bike making close to 150hp, based on the size being about right for the bike.
As always go too big and the air signal is weaker, so your low-down running could be affected as fuel drops out of the mix.
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'66 Amazon <-> '94 LS400 <-> '86 Suzuki 1135 EFE
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Hi Ive fitted r1 carbs to my B110 datsun project , these were from bogg brothers and had to fabricate a inlet manifold for me . Ive got better overall acceleration and great throttle response , seems more torque at lower revs.
Apart from that they sound great and look A1
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clint
Part of things
Posts: 168
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got bike carbs on my mk2 escort vacuum off dizzy onto single vacuum on carbs snappy acceleration sounds good to posted quick video on forum wink wink
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