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Triumph Torque    Cars    Herald/Vitesse  ›  spark plug gap
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zhcj
May 23, 2017, 4:58pm Report to Moderator

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is there any advantage to widening the spark plug gap on a vit 6 from the recommended 25

i was told widening it to 35 ish for mainly short town driving is better with todays unleaded fuel ?
mine tends to splutter a bit especially round town in traffic seems to run rich at low speeds at low revs its okay once its beyond 2000 revs approx
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glang
May 23, 2017, 5:04pm Report to Moderator

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Have you got electronic ignition and maybe sports coil fitted?
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zhcj
May 23, 2017, 5:11pm Report to Moderator

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no electronic ignition but yes a lucas sports coli non ballast type i think it is
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Pete Lewis
May 23, 2017, 5:38pm Report to Moderator

Tssc Herts and Beds A.O.
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are you on solex down drafts  or strombergs  ???

Pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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zhcj
May 23, 2017, 6:34pm Report to Moderator

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its on Strombergs Pete
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mazfg
May 24, 2017, 7:29am Report to Moderator


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I fitted Accuspark electronic ignition on mine...best thing I did. £35 kit off ebay


Current: Triumph Vitesse 6 convertible with O/D 1964

21 Years ago...and my first car! : Triumph Herald 1200 Saloon/ Tristan conversion 1966
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zhcj
May 24, 2017, 8:10am Report to Moderator

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yes ive found it bit more expensive for positive earth ill take your advice and get one
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RobPearce
May 24, 2017, 9:12am Report to Moderator

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Most electronic ignition kits are incompatible with positive earth. You would need to swap your polarity (which isn't terribly hard).

But I see you found a positive earth one while I was typing. OK.


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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zhcj
May 24, 2017, 12:47pm Report to Moderator

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yes Acruspark do one for positive earth its £10 more but id rather keep the car original if possible.

as you say though changing the polarity isnt a big task
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glang
May 24, 2017, 1:09pm Report to Moderator

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I think that fitted with possibly the sports coil (some electronic igntion makers dont like the effect of the higher current draw on their product) will allow a wider plug gap to be used but you'll have to suck n see if it improves the combustion....
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Pete Lewis
May 24, 2017, 4:53pm Report to Moderator

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Plug gaps wont have a great effect on any splutter and wheeze
thats other things more likely mixture or carb has wrong parts the 1600 does not have damper springs , just heavier diaphragm weights, if someone has fitted damper springs it will be too rich
make sure things like the rotor arm conract spring blade is actually touching the brush in the cap
Use only engine oil in the dashpots
Not a lover of bigger gaps  it takes longer for the spark to jump the extra so theres a payoff

Make sure the coil is wired correct polarity ,  
and pet hate of mine  never use plugs with an R in the suffix

pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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zhcj
May 25, 2017, 5:58pm Report to Moderator

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thanks all i will try this electronic ignition see of that helps but yes Pete the damper springs are in the carbs

they have been since i owned it could this be why it runs rich round town plugs are black in town driving so im guessing they are fowling up
they colour up nicely though once its on the open road.
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daver clasper
May 25, 2017, 6:48pm Report to Moderator
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Hi.

Had this with mine. After a lot of fettling with new carb parts, now have brown/sooty around city, grey on a run which is better.

Don't really understand the dashpot thing to produce more mixture for sudden acceleration , as its slowing down the main piston (which will let less air, but also presumably at the same time,   let less fuel through the jet hole?).

Cheers, Dave  
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zhcj
May 25, 2017, 7:36pm Report to Moderator

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have your carbs got the dash pot springs in or out Dave
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daver clasper
May 25, 2017, 9:26pm Report to Moderator
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Hi

Sorry. Mine is 2 Litre, that has the springs for main piston fitted (don't think springs are fitted to dashpots) and the lighter diaphragm weight/flange.

Dave
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glang
May 26, 2017, 5:50am Report to Moderator

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Quoted from daver clasper
Hi.

Had this with mine. After a lot of fettling with new carb parts, now have brown/sooty around city, grey on a run which is better.

Don't really understand the dashpot thing to produce more mixture for sudden acceleration , as its slowing down the main piston (which will let less air, but also presumably at the same time,   let less fuel through the jet hole?).

Cheers, Dave  


Hi Dave, with the airflow a lower pressure is produced in the intake side of the carb piston giving a higher velocity which literally sucks extra fuel out of the jet even though the needles upward movement is delayed by the dashpot oil.
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