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Pinto on Bike carbs
Marlon - 3/6/06 at 09:53 AM

At the moment I plan to use dellorto twin 40's on my 2.0 pinto as I already have them but they do need refurbing and more than likely new jets ect. has anyone changed from this setup to bike carbs and whet benefits are there (if any) to doing this?
Also which carbs are thought of as the best and what should I expect it to cost?
1 other thing is what are these carbs like for getting through sva with emmisions??
Cheers. john

Viper - 3/6/06 at 10:25 AM

quote:
Originally posted by CaLviNx
Hi

Not meaning to be funny but...... this topic has been covered in DEPTH a few times now, if you look up from reading this in the second colum third option you will find a magical place that allows you to SEARCH for these things instead of being a lazy git......


thought you said you were not meaning to be funny!!!!!

Marlon - 3/6/06 at 10:37 AM

thanks for the help

mookaloid - 3/6/06 at 11:12 AM

Following your search you should find:

Do it - it's better

R1 carbs

Bogg bros

emissions no problem

Cheers

Mark

DIY Si - 3/6/06 at 11:27 AM

There's a set going on e-bay at the moment for £100 inc P&P. Seller is r1john http://cgi.ebay.co.uk/yamaha-yzf-r1-carbs-kit-car_W0QQitemZ8071820616QQcategoryZ10490QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

andyharding - 3/6/06 at 11:29 AM

Bike Carbs 1
Bike Carbs 1

Marlon - 3/6/06 at 12:45 PM

Thanks all for help, Bike carbs it is then
just one more quick one is THIS a good buy, From searching I havn't worked that bit out yet Cheers all. John.

Viper - 3/6/06 at 01:03 PM

something to think about with bike carbs....

when you take your car to a rolling road to have the carbs/inition sorted, will they have the necessary part to set the carbs up?

andyharding - 3/6/06 at 01:28 PM

R1 carbs are over-priced now. Lots of other bikes have the same Mikuni carbs so look at other options.

Tuning them is very easy as there are only 2 jets and they are mostly self compensating.

Viper - 3/6/06 at 01:30 PM

quote:
Originally posted by andyharding

Tuning them is very easy as there are only 2 jets and they are mostly self compensating.


self compensating??
how does that work?

flak monkey - 3/6/06 at 01:50 PM

Im still not convinced that bike carbs will match a pair of properly set up webers/dellortos. What you have to remember is that a lot of people experience flat spots with carbs because they arent set up properly, not due to an inherant weakness in the carb.

I would like to see some rolling road comparisons on the same engine of bike crabs vs DCOEs. That would be interesting...

David

andyharding - 3/6/06 at 02:29 PM

quote:
Originally posted by Viper
quote:
Originally posted by andyharding

Tuning them is very easy as there are only 2 jets and they are mostly self compensating.


self compensating??
how does that work?


The bike carbs are CV (constant velocity) with a vacuum operated slide. This opens and closes to keep the airflow through the carb at the optimum point. The more the engine sucks the bigger the carb opens. The needle is also attached to the slide so the more the carb opens the more fuel it lets out. This system will make up for a slightly wrong main jet size.

Also, because they are so simple they are much easier to jet correctly than DCOEs.

andyharding - 3/6/06 at 02:30 PM

For example, by Bogg Bros bike carbs are for a modded 2L Pinto but run fine (all be it a bit rich) on my 1.6L Pinto.

Viper - 3/6/06 at 02:53 PM

so with that in mind, all these bikers that have there bikes put on a rolling road after they have changed pipes and airfilters, spending hours and pound notes setting up there bikes are wasting there time and money because the carbs do it all for you?

so what has been done to your carbs to "set them up" for a 2ltr pinto?

andyharding - 3/6/06 at 03:12 PM

Just increased the main jet size and adjusted the idle mix screws.

rusty nuts - 3/6/06 at 03:17 PM

Going to fit a set of bike carbs on my crossflow when I've made the manifold . Hope to get away with drilling the jets out a bit at a time . I've seen micro drill bits that go up in small increments but will they be small enough ?or is it still possible to get a set of jet drills?

froggy - 3/6/06 at 03:41 PM

the way boggs explained it to me was if the bike carbs can feed a 1000cc bike at 12000 rpm then they will feed a 2000cc car at 6000 rpm with little adjustment, the r1 carbs for my v8 have the main jet drilled from 150- 220 to suit the 4.0 rv8

picture courtesy of rwd kurt

[Edited on 3/6/06 by froggy] Rescued attachment CIMG0010.JPG
Rescued attachment CIMG0010.JPG

robbydee - 3/6/06 at 03:45 PM

i have recenltly changed from twin 40 webbers on a tuned pinto, to r1 carbs (ought form ebay and refurbished by bogg) and all i can say is WOW>>>

the pick up is instant... in any gear

my webbers were correctly set up and adjusted for the engine... so not their fault..
ps i am runnig a megajolt to but currently dont have the tps connected...
now i am waiting to get a power run on a RR.. will post the results...

GO FOR IT!!

Marlon - 3/6/06 at 04:54 PM

Thanks all for this, These were just the kind of answers that I wanted but could not find when I have searched in the past.
CHEERS. john.

TangoMan - 3/6/06 at 08:53 PM

I have R1 carbs fitted.

I haven't done a comparison but what I can say is that with a 285 cam my 2.0 still ticks over smoothly at 850rmp and picks up cleanly without any flat spots.


Economy is not too bad either if I drive sensibly. But them I don't have as much fun!!