Fitting new carb needles to suit my new free-flowing filters & rampipes....
Previously I'd fitted the socks & pipes only to find that the car wouldn't rev above 3500RPM at all, due to lack of fuel - so, as well as fitting a new fuel pump, I dug up a set of new ABC needles to suit my HS4 carbs.
Onwards!
Ready to rumble....
The standard carbs with the airbox removed
Dashpot removed, shows the spring and the tube running down the middle stores the dashpot fluid.
Main assembly removed. The needle (which is gently sprung) is obvious here! ;D Its shape regulates fuel flow into the engine as the accelerator is depressed - the narrower it is the more fuel is allowed in.
Inside the carb body - you can see the hole the needle fits into.
As you can see here...
The old fuel needle. New ones are considerably narrower at the tip.
Both reassembled and the pipes fitted. Mmm..lax power blue!
With the socks on..
Then, it was off to the exhaust centre - knocked it over a speedbump - ten minutes (and it was free!) later, with a new bracket and some sealant the blow was gone and it was quiet again
Then a thorough wash, some shiny decals to finsh things off and then a gentle cruise.
That's it for today - I have to say the car does pull a little better, certainly in first (spins!) and it has a nice induction 'whoosh' when you blip the throttle, but it was more as an experiment. Pulls cleanly to 5000RPM too now, which is nice, so a definite success.
All I have to do now though, is fit a fuel pressure regulator as the new fuel pump is pushing fuel past the needles at idle. I have a nice big glass filterking to fit, so tomorrow that'll be mounted up nicely.
Great fun though! ;D
Previously I'd fitted the socks & pipes only to find that the car wouldn't rev above 3500RPM at all, due to lack of fuel - so, as well as fitting a new fuel pump, I dug up a set of new ABC needles to suit my HS4 carbs.
Onwards!
Ready to rumble....
The standard carbs with the airbox removed
Dashpot removed, shows the spring and the tube running down the middle stores the dashpot fluid.
Main assembly removed. The needle (which is gently sprung) is obvious here! ;D Its shape regulates fuel flow into the engine as the accelerator is depressed - the narrower it is the more fuel is allowed in.
Inside the carb body - you can see the hole the needle fits into.
As you can see here...
The old fuel needle. New ones are considerably narrower at the tip.
Both reassembled and the pipes fitted. Mmm..lax power blue!
With the socks on..
Then, it was off to the exhaust centre - knocked it over a speedbump - ten minutes (and it was free!) later, with a new bracket and some sealant the blow was gone and it was quiet again
Then a thorough wash, some shiny decals to finsh things off and then a gentle cruise.
That's it for today - I have to say the car does pull a little better, certainly in first (spins!) and it has a nice induction 'whoosh' when you blip the throttle, but it was more as an experiment. Pulls cleanly to 5000RPM too now, which is nice, so a definite success.
All I have to do now though, is fit a fuel pressure regulator as the new fuel pump is pushing fuel past the needles at idle. I have a nice big glass filterking to fit, so tomorrow that'll be mounted up nicely.
Great fun though! ;D