spark plug gap vs lean mixtures

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Re: spark plug gap vs lean mixtures

Post by Tuner »

ClassAct wrote: Mon Dec 30, 2019 12:59 pm
Belgian1979 wrote: Mon Dec 30, 2019 10:00 am Where are you from Tuner ?
LOL. Word on the street he's from Mars, but I haven't been able to directly verify that yet!!!
Belgian1979 wrote: Mon Dec 30, 2019 3:35 pm LOL, the Dutch was a bit too perfect to be done by the Marsian equivalent of Google Translate.
Marzian to Dutch was not available, but Marsian to Klingon was, then Klingon to Dutch was easy because they are so similar.

As a bonus the Martian, Klingon and Dutch New Year are on different days so we get to party three times.


If you take the official test and fail do you still have to pay? If they don't charge for a failed test, retard the timing, raise the idle speed, lean the A/F as much as it will tolerate without misfire and see what it does. You might have to test a few times to figure it out but you won't be the first person who ever did it this way, I assure you.
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Re: spark plug gap vs lean mixtures

Post by Belgian1979 »

Yes we have to pay for a failed test.
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Re: spark plug gap vs lean mixtures

Post by Protech Racing »

I spent a lot of time getting British POS to pass our emissions testing.
Typical settings, 4 bottles of drygas per 8 gals of fuel. Advanced, fixed timing. Trimmed fuel mixture.
Often lowered floats and loosened the valve lash to 030 . Light oil . make sure that the intake had all of the heat that you can get to it . IE wrap the exhaust to the intake , . Snorkle the intake to the header etc.
Everything to get the idle way up and loose. Set the RPM at the max allowed.
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Re: spark plug gap vs lean mixtures

Post by Tuner »

Protech Racing wrote: Tue Dec 31, 2019 7:44 pm I spent a lot of time getting British POS to pass our emissions testing.
Typical settings, 4 bottles of drygas per 8 gals of fuel. Advanced, fixed timing. Trimmed fuel mixture.
Often lowered floats and loosened the valve lash to 030 . Light oil . make sure that the intake had all of the heat that you can get to it . IE wrap the exhaust to the intake , . Snorkle the intake to the header etc.
Everything to get the idle way up and loose. Set the RPM at the max allowed.
Advanced timing? Are you sure? The test must not have included UHC if you were able to advance timing and still pass.....unless a catalytic converter is involved, in which case a converter will clean up just about anything and the increased UHC from advanced timing may be advantageous because it will cause the converter to run hotter and that can bring the numbers down at the tailpipe exit.
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Re: spark plug gap vs lean mixtures

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Belgian1979 wrote: Tue Dec 31, 2019 6:17 pm Yes we have to pay for a failed test.
Well, that is a bummer. Here on Marz we don't pay for a failed test but we have to pass to renew the license plate, in which case the payout is plenty. You will need to find a friend or a shop with a 4 or 5 gas so you can tune it to the numbers you need. You still don't know what the specifications are? I looked on the web but no joy, it must be a Belgian state secret.
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Re: spark plug gap vs lean mixtures

Post by Belgian1979 »

Found this (as a Martian you will certainly be able to read this :D ) : (assume this is for the newer vehicles so not for my 1979)

i) meting bij stationair toerental van de motor:

het maximaal toelaatbare CO-gehalte van de uitlaatgassen mag niet meer bedragen dan 0,5 vol. %, en voor wat betreft voertuigen die een typegoedkeuring hebben gekregen overeenkomstig de grenswaarden in rij A of rij B van de tabel in rubriek 5.3.1.4 van bijlage I bij Richtlijn 70/220/EEG, zoals gewijzigd bij Richtlijn 98/69/EG(2) of latere wijzigingen, mag het maximale CO-gehalte niet meer bedragen dan 0,3 vol. %. Wanneer overeenstemming met Richtlijn 70/220/EEG, zoals gewijzigd bij Richtlijn 98/69/EG, niet mogelijk is, dan geldt het bovenstaande voor voertuigen die zijn ingeschreven of in gebruik zijn genomen na 1 juli 2002;

ii) meting bij het hoge onbelaste toerental, ontkoppeld (motortoerental minstens 2000 min-1):

CO-gehalte: maximaal 0,3 vol. % en voor wat betreft voertuigen die de typegoedkeuring hebben gekregen in overeenstemming met de grenswaarden in rij A of rij B van de tabel in rubriek 5.3.1.4 van bijlage I bij Richtlijn 70/220/EEG, zoals gewijzigd bij Richtlijn 98/69/EG of latere wijzigingen, mag het maximale CO-gehalte niet meer bedragen dan 0,2 vol. %. Wanneer overeenstemming met Richtlijn 70/220/EEG, zoals gewijzigd bij Richtlijn 98/69/EG, niet mogelijk is, dan geldt het bovenstaande voor voertuigen die zijn ingeschreven of in gebruik zijn genomen na 1 juli 2002.

Lambda: 1 ± 0,03 of overeenkomstig de specificaties van de fabrikant;

iii) bij motorvoertuigen die overeenkomstig Richtlijn 70/220/EEG (zoals gewijzigd bij Richtlijn 98/69/EG en latere wijzigingen) met een eigendiagnosesysteem (OBD-systeem) zijn uitgerust mag de correcte werking van het emissiesysteem in plaats van met de onder i) beschreven test worden gecontroleerd door de relevante gegevens uit het OBD-systeem uit te lezen en gelijktijdig de correcte werking van het OBD-systeem te controleren.

Then I found this :
http://wordpress.gentscheretrowielen.be ... erkeuring/

Seems like it's 4.5% for vehicles before 1986. No specs or other emissions. Hm that would mean I could have it running at almost 12.8/1 AFR....Seems I don't need to bother too much.
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Re: spark plug gap vs lean mixtures

Post by Tuner »

Dus uiteindelijk was deze hele oefening te wijten aan de misvatting dat je moest knielen voor de bureaucraten in de nationaal-socialistische bureaucratie, zodat ze zich konden verwaardigen om je te laten genieten van het nastreven van geluk met je auto?

Wat een geluk dat je je banden niet hebt veranderd van vooringenomenheid in radiaal, omdat je een lid van de nationaal-socialistische bureaucratie nodig hebt om een ​​vergunning te verlenen om banden te verwisselen.

De Amerikaanse autocultuur moet zich realiseren dat dit de toekomst is waar progressieve socialisten meer macht in de regering krijgen.
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Re: spark plug gap vs lean mixtures

Post by Belgian1979 »

Als het juist is...
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Re: spark plug gap vs lean mixtures

Post by chevyfreak »

So tuner will say "QAPLA" . Since he can speak klingon.

As for the martian.
Im south african. I speak afrikaans which is close to dutch but also close to speaking belgies. In the way olden days it was called kitchen dutch.
Been a long time since i read "martian " as you would call it, maar in alle geval , dankie. Het my brein wee n bietjie losgemaak.


Tot later.
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Re: spark plug gap vs lean mixtures

Post by Tuner »

Belgian1979 wrote: Wed Jan 01, 2020 9:35 am Als het juist is...
Als wat goed is?
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Re: spark plug gap vs lean mixtures

Post by Alaskaracer »

You guys are making my head hurt.......
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Re: spark plug gap vs lean mixtures

Post by chevyfreak »

Tuner wrote: Wed Jan 01, 2020 10:48 am
Belgian1979 wrote: Wed Jan 01, 2020 9:35 am Als het juist is...
Als wat goed is?
A bit rusty but I have it as "all that is just".
Juist =regvaardig. I think.
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Re: spark plug gap vs lean mixtures

Post by Tuner »

Nie seker hoe goed sarkasme vertaal nie.

Ik weet niet zeker hoe goed sarcasme zich vertaalt.
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Re: spark plug gap vs lean mixtures

Post by Belgian1979 »

I said : if the info in that site is correct...
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Re: spark plug gap vs lean mixtures

Post by Belgian1979 »

I tried 0.045' plug gaps yesterday. It marginally improved things, however I also used new plugs so this might have been the biggest reason for the improvement.

Trying a fixed 12% timing (which is what was originally the initial timing for this car) gave a rougher running engine and no real improvement in AFR. IAC corrected the amount of air to keep the engine running right.
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