Hi, purchased a 69 vw for my daughter.
It has some money spent on it by prevoius owner.
i believe its a 1835 and it has 009 with twin kadrons.
We did a service on it and then i located a petronix 2 ignitor and installed it.
we are constantly fouling number 3 spark plug in a range of 100 km.I have replaced needle and seats in the kadrons,i have replaced the float, i have added a second washer under the needle and seat on the offending carb,increased the spark gap up to 1 mm it has made an improvement we can go further but it`s still fouling.My next move is to locate a fuel regulator and install it.
Anyone with any other ideas??
Greatly appreciated.
My next plan is a fuel regulator, get it down to 1.5 psi.
see how it responds to that ? Another idea is, seek out Bosch super 4 electrode spark plugs and see if i can foul those?? or NGK Iridiums?? Does anyone have any of these in there bugs??
takis wrote:My next plan is a fuel regulator, get it down to 1.5 psi.
see how it responds to that ? Another idea is, seek out Bosch super 4 electrode spark plugs and see if i can foul those?? or NGK Iridiums?? Does anyone have any of these in there bugs??
With the carbs set right you shouldn't need to change plugs or the fuel reg (assuming its using the standard pump).
i`ve heard that the stock fuel pump can achieve pressures up to 4 psi, so this could be one of the issues.
Kads work on low fuel pressures generaly 1.5 psi is ideal.
Does anyone know where i an purchase a fuel regulator in Sydney??
Somehow i dont think anyspark plug would be able to self clean and not end up fouled eventually in my situation.
BizarreModeratorThe artist formerly known as blue74l
the very first service was done by me a week after we bought the car.
i did the valve gaps and replaced the distributor and rotors and leads.
It then started playing up and it has since been to too vw mechanics for some time .
They have made some attempts , but it continues to foul.
what if i place a hotter set of plugs??
Fuel regulator might be the answer??
I`ve heard that this clears this sought of phantom problem with Kadrons..
if it flooding was the prob it would be to both 3 and 4 on that side as ur dealing with single throat carbs
u say its carbon on the plug?
it doesnt sound like a fuel prob to me
i had an 1835 a while back that did the same thing to number one
all plugs were nice and clean excpet number 1 would carbon up
turned out to be a dodgy ring on that cylinder
1835 are notorious for it
they really are the worst cylinder kit u can ever put on a vw as they are too thin which causes them to overheat, warp and leak compression badly
-Joel
Craig Torrens6 times Australian, 7 times State Hillclimb Class Champion
forry2000 wrote:it will be a fuel reg issue for sure
Stan Pobjoy? May be in 1980 we all went to Stan, but not these days.
its better for Stan that people like you don't go to him :thumb.............especially if you think its a fuel reg issue.
If the pressure was too high, then both carbs would probably be affected and therefore fouling all plugs. If it was just one carby, then like what others have pointed out it would affect 3 and 4.
My guess is that you need a new coil.
And for the record, Kadrons can handle up to 7psi :thumb
what are the plugs? I run 1835 and had a fouling prob only a coupla weeks ago.Pulled the plugs and went 1 number hotter.Problem solved.Cant remember the exact number but mine were xx6x and i replaced them with xx5x or somethin along them lines.
ngk lowerthe number = hotter the plug
PS All Hail Stan our God! Yeah we went to Stan in the 80s and that motor is still running!Yeah its worn out a set of cylinders but the bottom end is Pobjoy counterweighted crank and is still running the same main bearings as when built in '88.AND is 1835cc
The first lot of plugs was Beru XX14X.
Next i installed a Petronix Ignitor two pointless ignition and with that i installed NGKS xx5x, it made a considerable difference as my plugs werent fouling in the next 50 km road trip.
I have now gapped the spark plugs 1 mm or 40 thou.
Great improvement now as i can go approx 200 km before it fouls the plug and makes the car intolerable to drive.
When i did adjust the valve settings the car was cold.Since then it has been to numerous visits to VW mechanics and they have done valve settings also.
I seriously dont know if its a 1835 , im guessing from the seat of the pants it gives when she does run well.
Im still in search of a fuel regulator as work doesnt allow me to make calls and i do long hours 12 hour shifts.
From my searches regarding these symptoms, it states Kadrons like low fuel delivery..< 2 psi..
Well im going out today and going to purchase another set of plugs, a ittle hotter and put them in.
I will try and call Burwood carb place regarding fuel regulator ..
Wish me luck..:duh
yes compression test was carried out , in the 140 psi vicinity for cylinders 2,3,4.Number one was an error i think as it registered 170 psi.I shall carry out another compression check with a better compression tester when i get mine back from family.
I`ve purchased a hotter NGK plug set.
A new lead is also on number three and im going to take it out on a run to Blacktown and back and see what results from this lot of tinkering.
Craig Torrens6 times Australian, 7 times State Hillclimb Class Champion
the coil was replaced when it went to Vw mechanics with a new coil.Also changed the rotor twice the distributor twice, leads also.Im going to swap the leads over 4 is going to 3 as the mechanic did mention bad batch of leads lately from manufacturer as he has had to recall some back due to ignition lead breaking down.Dont fear i will swap them not redirect them ..
i didnt locate fuel regulator, still searching for that.
Going out now for that drive to Blacktown ,rather sit and watch Bathurst..
Craig Torrens6 times Australian, 7 times State Hillclimb Class Champion
ok , thats an easy way to lower the pressure , thanks i shall look into it.
I was thinking of adding a plug in the fuel line with a smaller orifice cut back the flow but not the pressure.
Thanks for the advice that you can get fuel regulators from auto stores , never thought..
I will get one tomorrow and see how it goes. Never went for the drive as the bug has a rear flat 🤖
What else can go wrong.??
Thanks all for your advice, i shall keep you all posted of the outcome naturally.
If it is a worn cylinder issue , im considering in removing the engine and replacing the cylinders with 90.5 mm pistons and barrels at the same time doing up the heads and getting all back together.
Before we go there i would like to exhaust other venues before blowing a lot of money..
if u do end up doing a bit of a rebuild like u have already suggested swapping the 92mm 1835 jugs for 90.5mm 1776 ones is the best move
its a straight bolt in job as they have the same size spigots in the case and heads and u will have a much stronger motor
i did the same thing when i rebuilt my old 1835
as a 1776 it has more power due to the absence of compression leaks and runs alot cooler and quieter
but yea do a proper compression test, no point wasting money if its not needed
