Bike Carbs On A Pinto

[Guest red7]

Anybody fitted bike carbs onto a 2 litre Pinto? I've heard it's possible to buy an inlet manifold fitted with bike carbs "ready to run" from one of the specialist tuning companies.

[Guest erichetherington]

Try here, hope it helps

http://community.rhocar.org/index.php?showtopic=13768

[Guest salty_monk]

Boggs Brothers.

 

It's been talked about a lot. USe the search button.

[Snapperpaul]

My GSXR 600 carbs have been seperated to fit on a straight tube manifold. Whilst this is a simple solution there are some slight problems with other fittings, oil cooler pipes need a sharp bend or they touch the carbs, crank case breather has to pass between the carbs, throttle cable is awkward and the air filter crushes against the side rails.

This do it yours self approach is dead cheap, just the cost of the carbs, some 5mm ally plate and some 38mm ally tube. If you did not want to seperate the carbs then some silicon tube and a supprt bracket could be made to fit.

I belive the Boggs Brothers manifolds while beautifull are upwards of £300.

[Guest hypermick]

Whatever route you take to fit bike carbs, even with hand made manifolds some carburettor spacing will be required.

Most of the carbs are spaced identically between carbs 1&2 and 3&4 and usually wider between 2&3. Others are spaced identically. The R1 carbs are strange since they are spaced same 1-2 & 2-3 but wider between 3-4 to give access to the throttle pull linkage.

If anyone needs any spacing info before setting out to make a manifold I can supply it for various carbs, etc,. R1, R6 , S Rad.GSXR600, ZXR6/7,

One thing to bear in mind is though, some of the bigger bike engines actually run on smaller choke sizes than you would think so. A typical example is the early GSXR 1100 which runs on 34mm chokes size, whereas late versions run 38 & 40 mm depending on the year.

 

If you make a manifold keep the tubes short as possible.

 

Mick.

[Guest gavinc]

Sorry to be ignorant but could someone explain the advantage of bike carbs...

 

if they are give extra BHP why dont the manufactures use them.

 

i have raced/mechaniced for cars using pinto's for nearly 20 years now

 

even when we had full sponsorship from BURTONS bike carbs were never an issue.

 

i dont understand megajolt either.. we ran n/a pintos with 200+ BHP with lumintion ignition without

 

problems..

 

i hope this post does not offend anyone but getter nearer the time to make the decision on engine build

 

and as i dont have sponsorship. am willing to learn new tricks..

 

cheers

[Longboarder]

If you read all the stuff by tuners like Dave Walker in PPC, guys who used to deal with tuning carbs they explain that since fuel injection, mapping 3D ignition curves, lambda sensors and ECU's have arrived they are realising just what poor compromises carbs and a dizzy were. Even clever carbs like side draught webbers are rubbish by comparison. Bike carbs work on variable venturi principal like an old SU but the japanese sorted the design and they became very efficient, probably more so than twin webbers or at least as good. If you could buy almost new twin webbers on ebay for £50 you would. You can have a choice of bike carbs often for less than that! Mapped ignition is way better than any dizzy, plain and simple.

So bike carbs and megajolt is a very cheap way to tune your engine.

 

Nigel

[Guest salty_monk]

Lumnenition was a very rudimentary form of 2D mappable ignition anyway.... Something like a simple Megajolt as a I understand it.

 

Dan

[Guest hypermick]

I can understand the mixed views here and Gavin's obviously had good results with typical tuning methods, which have been found to be favourable and reliable, though as he says this goes as far back as twenty years ago. That said I have to agree, when I used to use Lumenition it was a damn good and easy way of getting rid of the notorious points and condenser set up, (Pirahna, also did a similar kit, but more expensive) but electronic dizzy's fitted as standard soon made these systems almost redundant.

Not sure about the aspect of mapping in Lumenition though Salty ! If the later ones changed, ok, but from my recollections you always gained an amplifier module and trigger kit and that was it, there was no adjustment of its electronic parameters.

 

As for the bike carbs Nigels right, the Japs got down to sorting the Mikuni's and Keihins out and compared with Webers & Delortos which even today are still damned expensive, the use of them on Pintos and other engines make them great alternatives. What isn't so great is the fact as said earlier in the thread, every manifold has to be made as a one off, at quite a cost, but that will change, its only a matter of time.

 

I just hope there are plenty of smiling faces,. when, it happens. No doubt we'll see.

 

Mick.

[Guest salty_monk]

Lumenition's had a rudimentary form of mapping in the "black box" that all the wires ran to.... or the later ones did anyway.

 

Even the simplest Aldon kit has some kind of "map" in it for setting the dwell angle etc. The newer ones are clever enough to alter it with engine load, speed etc.

 

Dan

[Guest hypermick]

Even the simplest Aldon kit has some kind of "map" in it for setting the dwell angle etc.

Dan

 

actually no Dan, the 1847v doesn't, its a simple trigger kit based on a hall effect switch, with two wires which go directly to the coil.

 

I looked at one some months ago at Aldon, it is a good product, but I just think for what it is its a little too expensive. Where it does score points though, its a reliable and proper way of modifying a points set up dizzy such as the Bosch unit.

 

A picture of it can be seen on Aldons website.

 

 

Mick.

[Guest salty_monk]

That confuses me then... as when I had one of those same kits fitted (you're right, just two wires to the coil) & had a rolling road tune up on the sheet was clearly stated that the dwell angle was set automatically by the electonics.

 

There's definitely some circuitry in the part the wires connect to.

 

Dan

[Guest MrSandman]

Anybody fitted bike carbs onto a 2 litre Pinto? I've heard it's possible to buy an inlet manifold fitted with bike carbs "ready to run" from one of the specialist tuning companies.

 

I have R1 carbs running on my 2.0Pinto with Megajolt. Looks great under the bonnet and gives smoother performance than webers. I drove it down to Le Mans this year and it didn't miss a beat. Fuel econony was not as good as I hoped but that may be due to a heavy right foot

 

I am about to swap engines to a Zetec and am so happy with the carbs that i may not bother going to Fuel injection.

[Guest erichetherington]

An alternative to carbs? Has anyone else realised how cheap throttle bodies are going at present?http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120053162083&ssPageName=ADME:B:WNA:UK:12

[Guest robocog]

Running my 2 Litre Pintosaurus 7 on bike carbs at the moment (34mm chokes -fazer 600's)

Its made a huge improvement over the 32/36 DGAV

 

Install was a doddle and tuning them has proved to be fairly straight forward

 

Manifold was made locally KNN Manifolds and they even re-spaced the carbs fuel rails and choke bar :-)

 

Plenty of tuning guides out there for CV carbs

(start at WOT and work your way down)

Mine just needed tha main jet taking out to 170 (just drilled the main jets with a 1.7mm bit) and it costs nowt to shuffle the needles up and down as they are on clips

the idle jets are also screw adjustable - making tuning/tweeking them really cheap compared to Webortolex types

The best bit is the fact that the carbs no longer throw a second choke open causing unpredictable back end step outs and deliver smooth predictable power and don't need accelerator pumps and diaphragm bits that WILL wear out

Fuel economy is superb (and also beats the DGAV hands down)

I have been able to tweak the mixtures without having to buy loads of sets of jets and correctors and new gaskets

Well happy with mine - the only thing they will get replaced with would be throttle bodies, eventually

 

Go for it - its definately put a load more life into the Pinto