gary gsx
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| posted on 7/1/07 at 10:09 PM |
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Bike Carbs
Good evening all 
I have a set of gsxr600 carbs sort of got for nowt they are 36 id with correct jetting would they be ok for a mild tuned 2ltr pinto
Cheers Gary
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PeterW
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| posted on 7/1/07 at 10:12 PM |
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quote:
Originally posted by gary gsx
Good evening all
I have a set of gsxr600 carbs sort of got for nowt they are 36 id with correct jetting would they be ok for a mild tuned 2ltr pinto
Cheers Gary
Hope so cos I've got as set of ZZR600 ones going on mine..!
Pete
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BenB
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| posted on 7/1/07 at 10:38 PM |
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If the power output of a gsxr600 is the same as a tuned Pinto you should be fine. After all, the same amount of air and fuel should be flowing
(approximately) for a given power output.... Having carbs that can supply more Bhp is okay up too a point until the butterfly is so mahusive that you
only need to use 20% travel and / or the venturi effect is weak due to a narrow choke...
I'd go for carbs that supply a bike that has 10-20% more power than the aim for the tuned engine.... That way there's some room to
manoever (just in case the engine proves more powerful than planned) but not enough to cause problems of its own....
Just my £0.01.....
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gary gsx
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| posted on 7/1/07 at 10:41 PM |
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Cheers Ben didnt look at it like that
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thunderace
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| posted on 7/1/07 at 11:19 PM |
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think the gsxr is around 100bhp
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stevebubs
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| posted on 7/1/07 at 11:49 PM |
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Gixxer 600 bodies were used successfully on Ben Smith's 160-something-bhp 4age...
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Surrey Dave
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| posted on 8/1/07 at 12:15 AM |
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Chokes
If fitting webers to a Pinto are the chokes larger than 36mm , I doubt it.
Dave Andrews website has some Weber specs.
I think they will be fine
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smart51
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| posted on 8/1/07 at 08:33 AM |
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The way to compare it is not power but airflow. Bike engines are more powerful partly because they have higher compression ratios.
Take the CC of your bike carb's engine and multiply it by the revs it can do. That's how much air it flows. Divide it by the CC of your
pinto and you have the RPM at which you have the same airflow. You want it to be above your red line. 600cc bike carbs would have to be off a bike
that revs to 20,000 in order to suit a 2000cc engine that revs to 6000.
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NS Dev
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| posted on 8/1/07 at 09:08 AM |
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errrr maybe but you still need the same amount of air to make a certain amount of power, unless all my physics and chemisty lessons were a waste of
time!!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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smart51
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| posted on 8/1/07 at 09:42 AM |
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quote:
Originally posted by NS Dev
errrr maybe but you still need the same amount of air to make a certain amount of power, unless all my physics and chemisty lessons were a waste of
time!!!
You need the same amount of air to burn the same amount of fuel. How much power you get out of that is called efficiency. Does spark timing, for
instance, affect the amount of air or fuel used? Does it affect the power output? What about compression ratio? Does that affect air conumption?
and power?
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tks
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| posted on 8/1/07 at 09:47 AM |
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mhhh
its difficult
because wich engine has more internal losses??
i guess that a 600cc carburator is build to mix for 600/4 = 150cc / piston..
saying that in the end its the amount of air/fuel wich passes wich makes the BHP
taken from that the losses gives the crank bhp.
the bike is higher because of the higher eff. (if you ask me).
anyway i think it will suit.
Tks
The above comments are always meant to be from the above persons perspective.
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NS Dev
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| posted on 8/1/07 at 09:47 AM |
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oh yes, that all does indeed, but if somebody is making 160hp using these carbs then they MUST flow enough air for 160hp!!! i.e. should be fine on a
tuned pinto unless its a race tuned one!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 8/1/07 at 09:53 AM |
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aaahhh, little back-pedal here, just seen that they were gsxr 600 throttle bodies not carbs that were used on the 160hp engine............. so
actually not so clear cut an argument
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Surrey Dave
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| posted on 8/1/07 at 10:06 AM |
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Viz
If you look at David Vizards 'Tuning The A Series Engine' page102 .
He has a graph for selecting the main venturi size
500cc @6000rpm = circa 37mm
Bearing in mind that engines with a downdraught weber can be quite quick , I dont think the 1mm difference is going to change your life on a road
engine.
Also throttle response and mid range will be good.
I'll say no more
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smart51
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| posted on 8/1/07 at 10:47 AM |
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quote:
Originally posted by Surrey Dave
If you look at David Vizards 'Tuning The A Series Engine' page102 .
He has a graph for selecting the main venturi size
500cc @6000rpm = circa 37mm
Is that a single carb of 37mm for the A series or 4 carbs like you get on a bike?
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Surrey Dave
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| posted on 8/1/07 at 12:06 PM |
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No
No that is assuming one venturi per cylinder
I know people are using giant size carbs and throttle bodies R1 41mm etc , but my car has 38mm bike carbs on an 1800cc , they are plenty big enough ,
most of your driving is done on the pilot jet and needles , you really have to cane it to get firmly up onto the main jets.
Also I believe 'robocog' has 36mm carbs on his 2 ltr Pinto , with no complaints , you could U2U him.
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keith2lp
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| posted on 8/1/07 at 12:43 PM |
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Carbs
I know of 1 car running gsxr 600 carbs (cryoman1965) on a 2L pinto that is working well & I beleive that robocog is running fazer 600 carbs that
are around 33/34mm.
I run twin 40 webers at the moment (changing to bike) and these are runnuing 36 mm chokes and this works fine. I beleive that if you want top end
power you should go for 38mm and for mid range, torque etc you should go for 36mm.
Gsxr 600 carbs are fine for most road applications.
Keith
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nige
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| posted on 8/1/07 at 01:06 PM |
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bike carbs
surrey dave ???
did you have to rejet or adjust the cabs
i have a 2ltr xe and am considering
blade or zx9 carbs
as you are running carbs your opinion is
welcome 
when you start this journey
you think it will be done in " no " time but then " no " turns into a " bloody " long time
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gary gsx
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| posted on 8/1/07 at 01:24 PM |
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Thanks chaps ill make a manifold (or ill have a go anyway)
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Surrey Dave
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| posted on 8/1/07 at 02:08 PM |
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Stuff
Yep, had to increase the main jets , and I also lifted the needles.
They are obviously a lot cheaper than Webers etc, and because of the constant velocity design they are very flexible throughout the rev range with
good top end.
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bricheun
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| posted on 12/1/07 at 10:58 AM |
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CBR600 on a 1600 jets
I am going to put the CBR600 carbs on my 1600, though Bogg Bros said they will mod the main jets for me, does anyone know whether the pilot and slow
jets require mods?
My carbs did not come with airfilter assemblies or velocity stacks.. anyone recommend something?
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coozer
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| posted on 12/1/07 at 05:08 PM |
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Just put them on and see what happens. If you've already got them, nothing to lose.
In the event they are too small, unlikely at 36mm, you can always swap a set off a bigger model.
After all, getting onto the engine is the hardest bit surely...
1972 V8 Jago
1980 Z750
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Deckman001
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| posted on 12/1/07 at 05:11 PM |
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I've got R6 carbs on my 1600x/flow (Bogg Bros) with no filter or sock type thingys, It needs 'choke' to start, no push of the pedal,
and when warm works a treat, initial throttle response is slightly vauge, but once reved slightly it takes off
Jason
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bricheun
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| posted on 17/1/07 at 09:27 AM |
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picture of the carbs and manifold
Jets are 165 mains.
Air jet to Main is blocked off (??)
As recommended by Steve Bogg.
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