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

quote:

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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

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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.....

Cheers Ben didnt look at it like that

think the gsxr is around 100bhp

Gixxer 600 bodies were used successfully on Ben Smith's 160-something-bhp 4age...

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

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.

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!!!

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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!!!

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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

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!

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

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

quote:

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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

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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.

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

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

Thanks chaps ill make a manifold (or ill have a go anyway)

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.

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?

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...

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

Jets are 165 mains.
Air jet to Main is blocked off (??)
As recommended by Steve Bogg.