Joined
·
108 Posts
Hello Alfa friends,
First I would like to say that I’ve tried to search for some keyword but failed hence this post. I know that the subject has been discussed frequently probably in different forums on AlfaBB.
However, I have a friend driving an oldtimer AR Sprint 1600 with bad ignition system and have bought an electronic distributor from manufacture “1-2-3 Ignition” model Tune/USB. The advantage is that he can add whatever ignition curve he want except for the fact that he doesn’t know! So this is a topic regarding ignition curve(s) to start playing with. Original setup for the engine regarding ignition distributor is the Bosch VJU4BR50 (might be a different version for Europe cars) and we have search almost everywhere only hitting tuning setups and not standard setup.
So my question is what baseline ignition curve to add imitating the Bosch ignition from VJU4BR50 or even better improve original curve. Good to know though: the car runs on Shell V-power (not necessary though but now it does) and without any high performance camshaft etc. and situated with the original SOLEX carb.
What is your proposal on degrees (centrifugal degree) to use?
We started to add 0.0 degree at 500 rpm (500 rpm is min value to use). To get the car running smoothly from cooled engine we added 25.0 degr at 1000 rpm. And finally 40.0 degr at 4000 rpm onwards.
The car runs OK but...
The vacuum hose is closed during the tuning/test.
First I would like to say that I’ve tried to search for some keyword but failed hence this post. I know that the subject has been discussed frequently probably in different forums on AlfaBB.
However, I have a friend driving an oldtimer AR Sprint 1600 with bad ignition system and have bought an electronic distributor from manufacture “1-2-3 Ignition” model Tune/USB. The advantage is that he can add whatever ignition curve he want except for the fact that he doesn’t know! So this is a topic regarding ignition curve(s) to start playing with. Original setup for the engine regarding ignition distributor is the Bosch VJU4BR50 (might be a different version for Europe cars) and we have search almost everywhere only hitting tuning setups and not standard setup.
So my question is what baseline ignition curve to add imitating the Bosch ignition from VJU4BR50 or even better improve original curve. Good to know though: the car runs on Shell V-power (not necessary though but now it does) and without any high performance camshaft etc. and situated with the original SOLEX carb.
What is your proposal on degrees (centrifugal degree) to use?
We started to add 0.0 degree at 500 rpm (500 rpm is min value to use). To get the car running smoothly from cooled engine we added 25.0 degr at 1000 rpm. And finally 40.0 degr at 4000 rpm onwards.
The car runs OK but...
The vacuum hose is closed during the tuning/test.
Attachments
-
24.5 KB Views: 2,021