Bike carbs (measuring size and making inlet manifold)
22-01-2007, 05:30 PM
#1
Bike carbs (measuring size and making inlet manifold)
I am going to be putting bike carbs on my mk2 escort with rs2000 pinto.
I have spoken to bogg brothers who say the ideal size is between 38 -42mm. My local superbike breakers has some carbs off a yamaha fj1200 that measure 42mm,but this is an external measurement,they only measure 36mm internally. Which measurement do you use?
Also i will be making my own inlet manifold as the bogg bros item seems expensive at £188,so any tips would be appreciated.
I have spoken to bogg brothers who say the ideal size is between 38 -42mm. My local superbike breakers has some carbs off a yamaha fj1200 that measure 42mm,but this is an external measurement,they only measure 36mm internally. Which measurement do you use?
Also i will be making my own inlet manifold as the bogg bros item seems expensive at £188,so any tips would be appreciated.
22-01-2007, 05:43 PM
#3
PassionFord Post Whore!!
Originally Posted by Alps Pacino
Internal i think, your more than likely going to need a set from a big sports bike like a gsxr 1000 or r1 try ebay theres loads on there
But otherwise, yes, I'd agree, be better of with a modern set of CV carbs than shonky old FJ ones.
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22-01-2007, 10:34 PM
#12
PassionFord Post Whore!!
1998 R1 Carbs have an internal dia of 40mm and are one of the easiest to make a manifold for, got a set sitting beside me now.
gurne your right though mate r1 is better fun
dont happen to know wheres best to buy bigger jets for the Mikunis ?
gurne your right though mate r1 is better fun
dont happen to know wheres best to buy bigger jets for the Mikunis ?
22-01-2007, 10:35 PM
#13
Originally Posted by BRIGSPORT
Any advise on making an inlet manifold?
PLEASE don't waste your time with carbs, get some early GSXR750 throttle bodies, 46mm dia throttle plate and flow a minimum of 216bhp nat asp. I fitted as set to my 2.3 engine RS2000
Mark
23-01-2007, 02:00 PM
#16
PassionFord Post Troll
Right,
Any carbs 36mm or bigger will do nicely. People will say you need to go bigger as using 45mm sidedraughts as an example but bear in mind that most traditional 45 setups for a 2 ltr pinto have to use a 36mm choke.
CV bike carbs don't need such a restriction to change airspeed. A 36mm bike carb will be 36mm all the way through.
I have used 38 mm gsxr carbs quite a few times with good success but have also tuned cars with zx7r and r1 carbs. Always re space the carbs to the engines bore spacing and then make the manifold.
On a pinto, from experience, you probably want to start with a 180-190 main jet and then set your needle heights.
Any carbs 36mm or bigger will do nicely. People will say you need to go bigger as using 45mm sidedraughts as an example but bear in mind that most traditional 45 setups for a 2 ltr pinto have to use a 36mm choke.
CV bike carbs don't need such a restriction to change airspeed. A 36mm bike carb will be 36mm all the way through.
I have used 38 mm gsxr carbs quite a few times with good success but have also tuned cars with zx7r and r1 carbs. Always re space the carbs to the engines bore spacing and then make the manifold.
On a pinto, from experience, you probably want to start with a 180-190 main jet and then set your needle heights.
23-01-2007, 02:46 PM
#18
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just seen this on ebay might interest you
http://cgi.ebay.co.uk/pinto-inlet-ma...QQcmdZViewItem
been thinking about getting thorttle bodies for my zetec engine. Are bike bodies as good as say jenvey ones or are you sacrificing power/torque for cheapness ?
http://cgi.ebay.co.uk/pinto-inlet-ma...QQcmdZViewItem
been thinking about getting thorttle bodies for my zetec engine. Are bike bodies as good as say jenvey ones or are you sacrificing power/torque for cheapness ?
23-01-2007, 02:55 PM
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Originally Posted by fudgeass
torqu just depends on the length of the inlet trumpets, so in a tranverse mount fwd car your not going to get very long ones in
power is determined by the size of the butterfly, for a 2.0l 42mm is optimum
power is determined by the size of the butterfly, for a 2.0l 42mm is optimum
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