kipper
|
| posted on 23/3/07 at 06:47 PM |
|
|
Help' failed immisions test on hydrocarbons
I took the car for MOT today and it failed on hydrocarbons.
Engine is a Vulcan crossflow with 40 DCOE Webbers.
I have no experience of theses carbs so quqestion is ,which screw will bring the reading down.
Thanks in advance. Kipper.
|
|
|
|
|
BenB
|
| posted on 23/3/07 at 06:50 PM |
|
|
Try to find out which cylinder is giving problems....
My motor was crap to begin with on HC but I'm pretty sure one of the cylinders wasn't firing. Hence unburnt petrol going straight through
the engine... Certainly taking off the spark lead made no difference to the sound... Changing the spark plugs seemed to sort things out and after that
(and a colortune tune-up) my HCs had come down nicely...
|
|
|
blakep82
|
| posted on 23/3/07 at 06:51 PM |
|
|
sorry, i don't know, but i was wondering about the vulcan crossflow...
I've got a vulcan V6, I'd never heard of Ford vulcan engines before. where is it from?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
SeaBass
|
| posted on 23/3/07 at 06:53 PM |
|
|
http://www.vulcanengines.com/
|
|
|
blakep82
|
| posted on 23/3/07 at 06:55 PM |
|
|
ah, that type of vulcan. vulcan engineering... no, mine ain't one of them
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
kipper
|
| posted on 23/3/07 at 07:00 PM |
|
|
Have fitted new plugs and it seems all cylinders are firing but plugs come out black as soot , the car goes like hell when I floor it but they tested
it at 1500 rpm.
|
|
|
blakep82
|
| posted on 23/3/07 at 07:18 PM |
|
|
ok, i beleive the mixture screw is the screw with the spring round it, sits just above the butterflies bolted to the manifold. as far as i can tell
from a black and white drawing in my weber carb book, they are brass screws with knurled edges.
my experiance in setting up carbs is almost nil so far, but i guess the mixture could be set too rich?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
kipper
|
| posted on 23/3/07 at 07:24 PM |
|
|
Thanks for that blakep82, does it say which way to turn it to weaken the mixture?
Regards Kipper.
|
|
|
blakep82
|
| posted on 23/3/07 at 07:31 PM |
|
|
i couldn't actually find anything about adjusting the mixture, but seeing as its a screw, if you screw it in it reduces the size of the fuel
channel, and makes it wider if you unscrew it. i guess screwing it in weakens the fuel in the mix.
photo of the page coming in a sec...
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
blakep82
|
| posted on 23/3/07 at 07:40 PM |
|
|
 
Description
 
Description
[Edited on 23/3/07 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
|
|
|
ed_crouch
|
| posted on 23/3/07 at 07:54 PM |
|
|
Too lean on idle. Richen it up, and the CO will rise, and the HC will drop.
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
|
|
|
JeffHs
|
| posted on 23/3/07 at 07:55 PM |
|
|
It's not as simple as turning a screw - that will only adjust your idle mixture at about 800 rpm. You probably need to change jets. See attached
site for really good basics. All bits are available from Burton
http://members.aol.com/dvandrews/webers.htm
Sorry - I've never worked out how topaste a proper link
Jeff
|
|
|
stevebubs
|
| posted on 23/3/07 at 08:00 PM |
|
|
Do you have a leak in your exhaust?
|
|
|
froggy
|
| posted on 23/3/07 at 08:14 PM |
|
|
what age plate are you on? all non cat tests are done at idle so why are they testing yours at 1500rpm?
|
|
|
rusty nuts
|
| posted on 23/3/07 at 08:33 PM |
|
|
What age is the engine ? may only need visible smoke test?
|
|
|
jacko
|
| posted on 23/3/07 at 10:04 PM |
|
|
Hi Dennis which garage did you go to for the mot ? i have to get my indy mot soon
Graham
|
|
|
kipper
|
| posted on 23/3/07 at 10:49 PM |
|
|
Hi all ,,, engine is a crossflow ford, all the paperwork is at my place of work so I cant tell the age until tomorrow.
I was under the impession that it should only have a visible smoke test. I will have to ask about that when I take it back for retest.
Jacko, the garage is near Selby where I work.
Thanks to all who replied to my question, I have taken on board you comments and will try to sort it tomorrow.
Regards Kipper.,,,,,,,,,,,,AKA Denis. 
|
|
|
C10CoryM
|
| posted on 24/3/07 at 02:31 AM |
|
|
Simplest way of thinking is: HC means missfire. Anytime there is HC it means that you are getting improper burn for some reason.
High CO means too rich, low CO too lean.
So, if your CO is low as well, you are probably getting a lean missfire.
If you give us numbers we can probably help you more. Your numbers, the limits, and average readings if you can.
"Our watchword evermore shall be: The Maple Leaf Forever!"
|
|
|
russbost
|
| posted on 24/3/07 at 09:04 AM |
|
|
If it's on a Q plate defo only vis smoke test. If on an age related plate then depend on the age of the engine & when registered - given
that it's a Kent I'd have thought most likely you shold have vis smoke test only. That said would expect engine to passon HC's at
2000 rpm unless it's not running right or not set up correctly
I no longer run Furore Products or Furore Cars Ltd, but would still highly recommend them for Acewell dashes, projector headlights, dominator
headlights, indicators, mirrors etc, best prices in the UK! Take a look at http://www.furoreproducts.co.uk/ or find more parts on Ebay, user names
furoreltd & furoreproducts, discounts available for LCB users.
Don't forget Stainless Steel Braided brake hoses, made to your exact requirements in any of around 16 colours.
http://shop.ebay.co.uk/furoreproducts/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
|
NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
|
.jpg)
