philhoward
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| posted on 22/5/08 at 09:55 AM |
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Bike Carbs
I am currently considering the option of converting to bike carbs from twin 45 webers. Does anyone have any experience of these? I believe that there
are many different types to choose from. Which would be best type for a 2lt Pinto with FR32 cam and Megajolt?
I have talked to Bogg Bros and they are quoting £585 for a second lot c/w manifold and set up on the bench. Chester Sportscars are quoting £487 for
second hand or £552 for new ones c/w manifold. There are also some on ebay at
here
These have a starting price of £259.00. Would they be any good.
Your comments would be most appreciated.
many thanks
Phil
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02GF74
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| posted on 22/5/08 at 10:15 AM |
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How MUCH?!?!?!?!
folks have done this for about £ 200 or less.
carbs off ebay, depending on which make/model will cost around £ 30 to £ 100 max.
custom made manifold around £ 100 - £ 150.
gsxr carbs are good as they are individual bodies so can be spaced to give equal inlet ports, somethign that is tantalisingly missing on the kit you
linked too.
a lot of carbs and TBs are twin units so you can still space them.
why do you feel you need to have bike carbs as you already have 45s? are they not running or set up well ?
if you are itching to change something, start with putting on megajolt then look at fuelling.
most common reason people fit bike carbs is cost when modifying engine - do the sums for the how mcuh the side drauoght parts will cost vs set of bike
carbs then you see why (ofcourse this does not include the manifold cost). DIY tuning of bike carbs is cheaper - usually just redrilling the jet
(stand to be corrected here).
also bike carbs are said to be more responsive but I am not convinced there is that much difference between a pair of correctly set up side draughts
.... unless someone has experience of it being otherwise.
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r1_pete
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| posted on 22/5/08 at 10:42 AM |
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As per ^^^^ I bought a set of ZZR1100 carbs for less than £20, and have subsequently bought 2 more sets for spares and the total inc postage is less
than £50 for 3 sets of carbs.
I have shelled out on a boggs manifold, £185 inc a basic re-drilling of the jets, will need rolling roading to fully sort, but they run quite well on
a 'bench' test.
You can buy steel inlet flanges for about £20, someone on here does them, if you fancy having a go at your own manifold in steel, wish I had.....
I really can't see there being that much difference between a pair of side draughts and bike carbs, in essence its the same choke/cylinder
ratio.
[Edited on 22/5/08 by r1_pete]
[Edited on 22/5/08 by r1_pete]
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Stuart_B
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| posted on 22/5/08 at 11:20 AM |
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i made my manifold from an pinto efi inlet manifold, and a a pice of alu tube.
i done paid £30 for the carbs, £10 for the manifold and under £10 for the tube and some alu welding rods for £20, so total was under £70, just need to
re drill teh jets and that is it.
but a steel one would have been cheaper and easyier to do.
stuart
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DarrenW
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| posted on 22/5/08 at 12:37 PM |
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I have pinto, megajolt and FR32 cam. head is diy ported. Flywheel lightened.
i went with ZZR1100 carbs 'cos they were kindly donated by Guinness. At the time little info was available, but since then they are more popular
cos they are cheaper than R1's etc.
i have Boggs manifold. By the time ive bought filter, cables, pump, pipework etc ive probs spent 300 ish. Rolling road (you need this) was £65 at
Boggs and car made 120bhp at flywheel. The car was transformed over the 38DGAS.
In all honesty i dont think i would switch from twin webers. Only advantage is by the time youve sold them you should break even ish.
Try and get carbs with TPS fitted as standard. mine dont and i havent managed a good reliable fit of the aftermarket TPS yet (to be honest not really
put much time into it as car runs so well on 2D mode).
Cams - Fr33 seems to be better choice in the Kent stable. I used FR32 cos i needed to change the knackered std cam and got one cheap off ebay. Both
Boggs and Newark Race engines (Dave Walker posts on here sometimes) slated my choice and recommended Piper A8 as better choice. Maybe slated is
strong, but they did say FR32 was a bit mild.
Take a look at Jacko's archive. Excellent pics of diy manifold and air box. His ZX9's propell his pinto MK very well indeed. Going diy
route brings the spends down by a lot. This gives you an indication of why Boggs charge 190 quid or so. At an estimated £25 per hour this means they
only charge 6 hours plus material - not bad if you see how much work goes into them.
I cant fault Boggs at all. They were very communicative on the manifold order and Dave was brilliant to chat to during rolling road. They will only
set up the carbs so you need to get everything else optimised yourself in advance.
Id suggest anything over £100 for set of carbs is steep. Some have seperate trumpets on a plate (ie mine) so get this as well. If you can get pump
from same bike then all the better - otherwise any bike pump from similar cc bike will do. Mine was £20. Throttle cable £20. Filter (K&N
Challenger) £40 (used).
Its mind boggling when you start, and you convince yourself its harder than it is. Best way is to jeust get on with it - one day the car will fire up
and you will wonder what the fuss was about.
Did i mention rolling road set up Do it. My car was running really well before. At the tune i was amazed how lean they were, especially at higher
loads. Dont risk it for £65. The day out makes up for it, Boggs is like a working petrol heads museum.
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robbydee
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| posted on 22/5/08 at 03:06 PM |
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I have a pinto with fr33 and r1 bike carbs, also running megajolt...
and its ffing awsome compared to the Webbers i had b4, the throttle response is great, just beware of the shorter movement in closed throttle to fully
open, i had to change the throttle pedal, as i ended with only 1" travel fully open to fully closed..
Does anyone have a decent megajolt map for this set up they can share?
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rusty nuts
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| posted on 22/5/08 at 06:14 PM |
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Made my own manifold out of 12mm ally plate and some round bar although I got a mate to weld it up . Total cost of manifold was about £65.00 and a bit
of time
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jacko
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| posted on 22/5/08 at 08:35 PM |
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Best thing since sliced bread
As Darren said look in my archives + do a serch under my name
jacko
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tcr
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| posted on 26/5/08 at 05:19 PM |
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gbs (robinhood sports cars) sell a set of fireblade carbs with jets drilled, manifold with vacum take off's and pipercross filter complete with
back plate all for under £350, we removed the 45's bolted these on and stood back in amazment
MK MIDI ZX10R
http://www.facebook.com/media/set/?set=a.4393256076054.2182513.1427988207&type=1&l=64c91c3c17
why isnt anything simple!!!
torquetune.co.uk
nrpexhausts.co.uk
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