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carmadmike
November 5, 2016, 2:22pm Report to Moderator

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Just out of interest I put my vitesse on a Co meter today.
The reading came up at 5.5 Co.
Car is running quite well and I didn't adjust anything.
Would this be a good reading for these cars.
What should the reading be about.
Mike.
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Nick Jones
November 5, 2016, 3:34pm Report to Moderator

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That is on the rich side I would say.  Think they should be about 2 - 2.5%.

Will it hold 5.5% or does it tend to creep up if left idling?  That can suggest leaking needle valves.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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carmadmike
November 5, 2016, 4:08pm Report to Moderator

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Hi Nick
It was Fluctuating between 5.4 and 5.6 so i took an average of 5.5 as the reading
It was done on a gunsons co meter at home so dont know how acuate they are.
Mike.

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Nick Jones
November 5, 2016, 6:20pm Report to Moderator

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To pass an MoT for 1975-on cars you'd need to be under 4.5% (and <1200 ppm HCs).  Earlier than that is just "no visible smoke".  If it's running ok and giving reasonable mpg, probably best left alone.  You could probably lean it a bit though.

I was given a old Gunsons gas tester to try a few years back.  It had had virtually no use, but dated from the 80's.  It appeared to work ok and showed 0.5% CO at idle on my FI Vitesse (almost good enough to pass a CAT emissions test) and about 0.2 % on our '96 GTI which did have a CAT.  You'll not get that with Strombergs though - or at least you might, but it won't drive very nicely!

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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carmadmike
November 5, 2016, 9:36pm Report to Moderator

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It's a 2.5 engine with dolomite sprint su.
I might see if I can lean it off a bit sometime but going to breakfast club at Haynes museum tomorrow. The run from Poole will give me a good chance to see what sort of mpg the car is doing.
Mike.
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ferny
November 6, 2016, 8:52am Report to Moderator

Mr Hoppy!
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How efficient is its combustion cycle looking?

As in, how do the spark plugs look?


Acclaim - fully working and on the road
13/60 Herald - mx5 powered and other such fun things, legal enough...
Mk1 2000 - it's still alive, just sleeping
Expert 815d - the slug

If in doubt, do up until you hear the crack and then go another 1/4 turn to ensure tightness.
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carmadmike
November 6, 2016, 11:19am Report to Moderator

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After a 50 Mile run this morning they look a light tan colour.
Couldn't do mpg at the moment as miles on the speedo is broken.
Just wondering if I will get away with another turn of a flat leaner to get the best fuel consumption.
Mike.
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ferny
November 6, 2016, 11:24am Report to Moderator

Mr Hoppy!
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Go for another 1/2 and see how they look coming home. You're not far off the right colour. Trouble with modern fuel and (from experience) differences in qualities depending on where you are, the "ideal" colour changes slightly. As long as they're pale, have no deposits, the car performs as expected when cold (correct use of choke needed) and warm then the set-up is good.


Acclaim - fully working and on the road
13/60 Herald - mx5 powered and other such fun things, legal enough...
Mk1 2000 - it's still alive, just sleeping
Expert 815d - the slug

If in doubt, do up until you hear the crack and then go another 1/4 turn to ensure tightness.
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Nick Jones
November 6, 2016, 11:25am Report to Moderator

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Posts: 9,930
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You could try another flat leaner.  If it's still running well after that, perhaps one more.

The question also arises as to whether the SU needle profiles fitted are correct for whatever the spec of 2.5 you have, though again, if it runs well and fuel economy is decent (upper 20s, early 30s on a decent, open road run) you could reasonably assume they are near enough!

Didn't make it to Haynes this morning but give me a shout if you plan to go again - I'm only 15 mins away.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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carmadmike
November 6, 2016, 4:19pm Report to Moderator

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ferney
didnt read your reply till I got home but will try leaning it off 1 or 2 flats to see what hapens.
I can always put it back again. thanks for the advise.
Nick
I did some rough calculations using aa route planner for millage. as to where I went today and a guess as to how many litres I used.
It came out at about 30mpg and I was traveling about 50 to 60 mph most of the time So not to bad I surpose.
Yes will let you know if I go up that way again thanks for the offer.
like wise if you are coming my way to Poole. Would be good to put a face to a name.
Mike
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