Post Number: 27
|Posted on Thursday, 10 October, 2013 - 11:16 am: |
Following the successful return of 14762 to terra firma now with functional steering, braking and suspension capability my attention has turned to the propulsion side of the equation.
Having had the opportunity to give the beast a test run all is not 100% up front unsurprisingly. Currently she's idling rather high, sounds to have a slight misfire and smells to be running rather rich. There is also a marked stumble on light throttle pulling out of junctions etc and not delivering power the way it should when on the move. Thankfully there is only a small whiff of smoke on startup after standing suggesting a little oil is sneaking past seals but this disappears quickly so is not giving me great concern.
So, having been thoroughly terrified by reading old horror stories including a thread from 2009 on here on the complexity and potential for costly disaster on these early carb fueled Turbos I head into the tuning process with trepidation...
I want to get the basics on the car set up properly as a first step, as such fresh plugs have been procured and gapped to 0.8, a fresh air filter will follow, and my attention will go initially to ensuring the timing is in order.
Now, the workshop manual procedure calls for a specialist diagnostic tester to be plugged in to the rudimentary ECU in order to display timing and RPM information, I am guessing that these devices are not something to be found on the shelf at my local Repco or Supercheap. So, my question would be - is there a modern easily available equivalent device that will fulfil this function or something else I can use to the same effect? If not and it's back to a stroboscope approach where would I find the appropriate timing marks?
Once I've got the basics set correctly I'll likely get the car in for a proper tune and setup if it still isn't right as I don't happen to have an exhaust gas analyser lying around and finer carbie adjustment is definitely not something I'd be comfortable tackling.
Apologies for asking questions that I'm sure must be very basic and self evident to a lot of the more mechanically proficient amongst you, but I am thoroughly enjoying attempting to do as much as possible on this car as I can myself and learning a huge amount along the way, so keen to avoid just sending it off to a specialist unless I absolutely have to.
Advice and information greatly appreciated as always.
Post Number: 24
|Posted on Thursday, 10 October, 2013 - 08:46 pm: |
Hi Alister,you do not say what year your car is?as regard to timing you will first have to look at the twin distributor drive has the drive belt been changed?I would recommend you get a copy of the WORKSHOP MANUAL applicable to year of your car.these are available on this website or go to the Rolls/Bentley topics site.Once you have the manual you will be able to find the timing marks and setup info,You can use a Strobe to verify Static timing and if you have an advanced Strobe you can also do checks on Advance/Retard and also RPM With regard to the poor Idle this could be down to the Carb,Ignition or poor fuel. Note the specs differ dependant on Country and Origin of the car.hope this helps
richard george yeaman
Post Number: 124
|Posted on Thursday, 10 October, 2013 - 09:29 pm: |
The condition of the distributer cap and the Rotor arm or even a faulty ignition wire might have something to do with your misfire.
Post Number: 28
|Posted on Thursday, 10 October, 2013 - 10:49 pm: |
Thanks, sorry I should have said, 14762 is an 86MY Turbo R built in Dec 1985 for the UK market hence carburettor housed in an air chamber and single distributor as with the Mulsanne Turbo.
Quite a rare configuration I gather and UK/Europe only going from what I've read.
Post Number: 26
|Posted on Monday, 14 October, 2013 - 08:44 pm: |
Hi Alistair, as your car was made for the UK market,it would have been fitted with Solex carb as standard these were notorius for having the mounting flangeto distort however this genarally leads to a weak mixture as you say yours seams to be rich.with regard to the single distributor this is non standard so may be the problem however if it ran OK I suggest you check out the Ignition system paying attention to any connectors these do corrode giving poor performance,any loss of ignition will give rise to Black smoke and hesitation as you state ,also check the cap as Richard suggests .hope this helps.Ernest