car on full chat doing a lap of Brands Hatch despite the fact they are actually driving around in a 1.2 Fez borrowed
from their nan until their next doll cheque comes in and they can buy their own car.
Im not here to judge them, I used to put the biggest air filter I could find at Japfest
on the smallest engine car I owned at the time. I think my record may be a Skyline K&N
on a 1.4 corsa, but like I said we all do silly things... and still do!
just by working on them every weekend with my friends and the Definitive crew.
Ive learn't that if you can't undo a bolt it doesn't mean that its stuck
or seized, it just means you need a bigger bar or to eat much more meat!
Ive learn't that when you think you have lowered you car enough or fitted the widest wheels
possible you haven't, in fact you've been a fag and should of gone for the 9's!
All of this as helped me progress not just as a "mechanic" but as a person.
Its amazing to think that my passion for cars and working on them has made me a better person.
Ive become more patient, more open minded and more capable of stepping back
looking at a situation, thinking it through and finding the right outcome.
Anyway thats my CV over with ;) now time for the real reason about this post.
I recently took on quite a big project! Another MK1 Golf except this one was and still is in a bit
of a state to say the least. It has no carpet anymore, no door cards, handles or window winders.
No exhaust, no speakers, no radio not even any seat belts currently but one thing it does have
is a 1.8 16V from a MK2 GTI that now, thanks to my new skills, patience and understanding
is on R1 Bike Carbs, so I thought id share this with you.
Ive had quite a lot of experience with VW engine and engineering and one system of theirs
ive always tried to avoid is the dreaded KJet. Anyone who know's VW's knows why
and for those who don't let me sum it up for you.
Its a very dated way of fuel injection, no computers here so you might think ahh well its
easy then, il just get my spanners and hammer out and hit it untill it sprays
enough fuel in to mix with air and a spark and go bang, well it isn's as easy as that.
KJet uses vacuum to control the fuel pressure, this is all done in a metering head
made by bosch, the same people who probably made your washing machine.
This detects how much air is being sucked in using a large flap in the inlet, by this flap
moving up and down it moves a small valve in the fuel side which lets more or less fuel in.
This sounds great, but any small vacuum leak or discrepancy between the two and the
car runs like its being fuelled with nails and other sharp objects.
Then there is the cold start process which for reasons like there is only
24 hours in a day, I won't go into.
So I decided after battling with it for over a week to strip it all out.
Get rid of everything fuel related and start again from scratch.
That night on the wonderful site that is eGay I came across something
that I knew I had to buy, something I had wanted to do for a long time.
I bought these...
I had looked into putting bike carbs on previous cars before but was always a bit
scared of by the idea. The fuel economy didn't worry me (anyone who drives a car
to save money really shouldn't be allowed to drive anyway and should walk or buy a horse)
What worried me was the complexity of fitting, tuning and running them.
But with my new found confidence detailed above (see what I did there)
I thought id give it ago, after all how hard can it be!
Fitting bike carbs to a car is nothing new. People have been doing it
for quite a few years now and people in the kit car scene see it as the
only way to go, unless you have money for throttle bodies which a lot of people don't.
They are no different to the carbs on your lawnmower and that 50cc moped you
had at 16, they mix air with fuel and thats it!
I picked up the carbs one night after work, it was only a 4 hour drive.
Got home and the next day set about stripping them down and checking
they were all ok. Making sure the jets were of a suitable girth to cope with
the bigger amount of fuel needed in my engine compared to a bike was crucial.
They looked great, so I put them back on the manifold and waited to have enough time to fit them.
Luckily KJet being as primitive as it is means its has a stand alone spark, something many people
pay good money for with things like MSD and Megajolt, this meant I could leave all that
side of the engine alone and just worry about the fuel things. I also got an R1 fuel pump
which meant the carbs could sip their fuel at 3psi not the 5 bar needed to run KJet.
After a day of fiddling to strip all the inlet manifold etc off I had it down to the bare minimum.
Now it was time to bolt the carbs on and hope for the best.
This is what happened!
They need a little fiddling and I need to get the exhaust on this weekend but other
than that it runs, sounds the dogs danglies and I can't wait to tear around in her.
Anyone who is thinking of putting bike carbs on their engine id say do it.
It is pretty easy, you get great induction sound (much better than any £5 cone filter)
and you get increased performance once set up right.
Hopefully you have enjoyed reading my little experience, its been
a while since I last posted up anything on here and thought it was about time I got
back into it, I do rather enjoy it.
Words by Nate