Too rich?

btc-er Commited Dubber

72 posts · joined Jul 2009 · 3 Dec 2011, 6:01 pm

#875488

I'm thinking too rich? All 4 plugs look the same. Any other opinions? The motor is a 1600TP with an EMPI (Weber) 32/36 carb.

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 3 Dec 2011, 7:10 pm

#875499

http://www.procharge.com.au/images/stories/images/faults/spark_plug_test.jpg

follow the link, usually a good place too start.

It looks rich, but also could be weak ignition

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 3 Dec 2011, 10:52 pm

#875521

Yea get a single new plug and connect to a lead and crank her over holding the plug to an earth point. If the spark is good thick blue you are good. If weak and yellow then either coil feed issue or coil is on it's last legs.

Also, the 32/36 webber isn't a very good carb on a VW as fuel easily falls out of suspension. These need an experienced rolling roader with good carb knowledge to jet correctly as he will have to mess around with the emulsion tube to get optimum fuelling.

madness is in the eye of the beholder 👍

sander288 "Bolt-on Master"

1,404 posts · joined Aug 2008 · 4 Dec 2011, 11:37 am

#875580

good call on the carb, those single webers whether a progressive or IDF usually are tuned REAL rich to make them run; you'll need to see if your getting manifold heat as psimitar said the fuel does fall out of suspension if there isn't enough manifold heat.

BMW R65 LS
1967 1300 Deluxe
Swing-axles FTW ❗

btc-er Commited Dubber

72 posts · joined Jul 2009 · 5 Dec 2011, 11:03 am

#875682

Thanks guys. I had the carb jetted and dyno tuned at Leon Motors a year ago and it was phenomenal. It ran beautifully and made really good power. I feel like I've been chasing that perfect tune ever since. Sure I could just take it back to Leons for another go on the dyno, but where's the fun in that! 😂

Good point regarding possible weak ignition. I'll check that as soon as I can.

I leaned out the mix slightly on the weekend and adjusted the spark gap whilst I was there. She seems to be running a bit better today, but perhaps that's just a placebo effect.

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 · 5 Dec 2011, 5:44 pm

#875732

btc-er wrote:I had the carb jetted and dyno tuned at Leon Motors a year ago and it was phenomenal. It ran beautifully and made really good power. I feel like I've been chasing that perfect tune ever since.

Then it isnt jetting

It is either mixture screws or as said, maybe the coil

Futue te ipsum!!!

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 5 Dec 2011, 11:53 pm

#875797

yea if it was properly dyno'd then apart from cleaning out the jets it'll be ignition related 😉

madness is in the eye of the beholder 👍

btc-er Commited Dubber

72 posts · joined Jul 2009 · 9 Dec 2011, 6:13 pm

#876273

I tested the coil as per the instructions in the idiot book and videoed for posterity:

http://www.youtube.com/watch?v=I0hqPhq9ar4&feature=youtu.be

What do you think? Is the coil dodgy? The spark doesn't seem terribly impressive to me.

psimitar Son of Jim - Creator of Good

2,506 posts · joined Jan 2009 · 9 Dec 2011, 11:33 pm

#876316

So I saw 2 sparks then. Yellow in colour and looked thickish but hard to tell from pixilation in the video.

Should be nice thick and blue. Try powering the coil direct from the battery thro a 10amp switch to rule out voltage drop thro old wiring and ign switch. If still weak looking and yellow then try to borrow a new or good coil as the quality of the coils these days ain't great as even Bosch get there stuff made in China.

madness is in the eye of the beholder 👍

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 · 10 Dec 2011, 9:01 am

#876341

Do your spark test but cranking the engine over with the key. You will not only get more sparks to see, but also under actual starting voltages/conditions. Looked weak but enough in the vid, should get close to 10mm on a GOOD coil, more for a mega set-up.

Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 · 10 Dec 2011, 4:02 pm

#876386

btc-er wrote:Thanks guys. I had the carb jetted and dyno tuned at Leon Motors a year ago and it was phenomenal. It ran beautifully and made really good power. I feel like I've been chasing that perfect tune ever since. Sure I could just take it back to Leons for another go on the dyno, but where's the fun in that! 😂

Good point regarding possible weak ignition. I'll check that as soon as I can.

I leaned out the mix slightly on the weekend and adjusted the spark gap whilst I was there. She seems to be running a bit better today, but perhaps that's just a placebo effect.

Hi
If you are running points and a condensor... it may be the condensor... as they were replaced along with the dissy cap and rotor button every year or so originally...

Have You checked out the spark plug leads?
especially the coil high tension lead..
if its the silicone type... then they can break down internally..
resulting in a weak spark...

Is Your ignition power supplied thru the ignition switch...??

You should be using a relay mounted near the battery, so You get 12+ volts at the coil... [hot start kit]

as the voltage thru the ignition switch can vary greatly due to the contacts in the ignition switch being burnt etc..

cheers

LEE

it pays to have lots of spares when You live a long way from VW shops etc.... Lee

- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---