2.0L Twincam engine & Dellorto DHLA - need ignition advance

[KirillZip]

Hi everyone! Have Fiat 2.0L Twincam engine (132 block) & 2 of Dellorto DHLA (40) and ECU based ignition system - were i can set up any ignition advance angle for every RPM ( and also with detonation sensor - but with distributor).

This system can also works with intake manifold vacuum sensor ( can have 10 lines for different values).

But as I have short runners after each card - pressure value is ustable.

Another problem is that it is very long and difficult to start engine. Especially when it's hot.

So, I think to set one curve without vacuum correction. And ask u to plz help me to do it! I use 95 petrol and engine is EC spec.

Now i have

600 - 16
720 - 18
840 - 19.5
990 - 21.5
1170 - 24.50
1380 - 27.5
1650 - 31.5
1950 - 34.5
2310 - 35.5
2730 - 36.5
3210 - 36.5
3840 - 36.5
4530 - 37.5
5370 - 38.5
6370 - 38.5

[Nut124]

You have full advance (36) too early. My sources suggest 36 at and after 4000. Going over 36 does not gain anything but could hurt.

I'd go linear from 16 at 1000 to 36 at 4000. Then 36.

I have dual 44IDFs. I take vacuum from one intake runner and use a combination of volume and small orifice to dampen the vacuum pulsation. There is still a little pulsation at the distributor vacuum module but it works OK.

If you use the vacuum, then 16 at idle, without vac, is too much.

[Nut124]

Another problem is that it is very long and difficult to start engine. Especially when it's hot.

As to hard starting when hot. This happens to me as well. I attribute this to momentary flooding of the plugs. When the engine stalls, one may pump the gas pedal a few times. This squirts too much gas in to a hot chamber and the engine will not start.

When this happens, I slowly floor the gas peda, hold it down and then crank until it tries to fire. My assumption is that this allows the excess gas to leave and the plugs to dry. Works for me.