Backfire on start up.

[pugwash]

As the heading says, turns over ,backfires once then runs ok, could the timing ne out ? 2L a/c

[sarran1955]

Hello,

I'm sorry , but my crystal ball is in for repolishing at the moment....

Perhaps you could give some engine details, or other clues....

How many grilles on the front...

Do you fill it with diesel or petrol....

Stuff like that...
Its a VW thing


Cordialement,

[dugcati]

yes most likely timing - if too far advanced

[sarran1955]

Hello again,

No seriously,

For example, does it turn over well b4 starting....

Have you changed anything recently......

Have you been tinkering with a 10mm spanner....

Stuff like that...




Cordialement,

[pugwash]

Hello again,

No seriously,

For example, does it turn over well b4 starting....

Have you changed anything recently......

Have you been tinkering with a 10mm spanner....

Stuff like that...




Cordialement,

Lol correct, its A 2L Aircooled 82, recently had trouble with Dizzy, and had to put a 009 and elect ign in for the time being I think its timing, any guidance on what I should set it at woiuld help, it only bangs once on the turnover, then runs ok, its set at 5 BTDC at the momentr

[CovKid]

Those 2 litres don't run well on 009s fella (no stock v-dub does accurately). The problem you've got is that without the vacuum advance/retard, the dizzy won't meet the needs of the engine at all throttle openings and you can't therefore set a timing point that works perfectly. From memory of the 009 you aim to get 29 degrees at max throttle opening and live with whatever you get at idle. Its a rotten compromise and thats all it is, a compromise. The right dizzy is miles better in terms of performance/economy/safe running.

I should add that many dizzy units on these now have wear/play but a good lathe man could rebuild an old one for you. This is rather early in the day for me to muse your problem so excuse me if I'm not as sharp as I might otherwise be but the carbs themselves are somewhat complex and lots can go wrong there too. are both carbs working in unison? Shut off valve working correctly on L/H one?

[pugwash]

Those 2 litres don't run well on 009s fella (no stock v-dub does accurately). The problem you've got is that without the vacuum advance/retard, the dizzy won't meet the needs of the engine at all throttle openings and you can't therefore set a timing point that works perfectly. From memory of the 009 you aim to get 29 degrees at max throttle opening and live with whatever you get at idle. Its a rotten compromise and thats all it is, a compromise. The right dizzy is miles better in terms of performance/economy/safe running.

I should add that many dizzy units on these now have wear/play but a good lathe man could rebuild an old one for you. This is rather early in the day for me to muse your problem so excuse me if I'm not as sharp as I might otherwise be but the carbs themselves are somewhat complex and lots can go wrong there too. are both carbs working in unison? Shut off valve working correctly on L/H one?

Carbs are working fine,been checked and all working ok.

[jason k]

is that you chris?

my mate has a known good cu dizzy in bridgend.

if you want his details drop me a PM

[dugcati]

Those 2 litres don't run well on 009s fella (no stock v-dub does accurately). The problem you've got is that without the vacuum advance/retard, the dizzy won't meet the needs of the engine at all throttle openings and you can't therefore set a timing point that works perfectly. From memory of the 009 you aim to get 29 degrees at max throttle opening and live with whatever you get at idle. Its a rotten compromise and thats all it is, a compromise. The right dizzy is miles better in terms of performance/economy/safe running.

I should add that many dizzy units on these now have wear/play but a good lathe man could rebuild an old one for you.

well put that man take 10 points!

[pugwash]

is that you chris?

my mate has a known good cu dizzy in bridgend.

if you want his details drop me a PM

Yes Jason, its me PM you later

[sarran1955]

Hello,

Right its very simple:

009 dizzie ------to-------bin ------in a ====== straight line.

Cheapo solution, get van dizzie off e bay, or even buy new chinese knock off SVDA for about 70 €, fit a coil with 1.5 ohm resistance, ( ie anything NOT electronic ignition)

The chinese knock off SVDA ( CKOSVDA for short) even comes with points and condenser fitted.

Set your timing to 8 degrees BTDC, you will need a strobe light and a tippex.

Set your dwell angle to 45 degrees, or about 16 thou gap.

Set your ( I hope) standard solex pict carbs, for the idle mixture to be at 4 % co.

You will now have a reasonably smooth motor, with no drive through flat spot.

Mangled carbs and airleaks excepted of course..

Cordialement,



Run on 4 star.