Enn
Well-known member
Ok, so after long (few years) hesitation I finally did the job today, took me 3 hours in the morning and some angry glimpses from neighbourhood...
However, it was not at all as straightforward as I expected it to be from the writeups.
According to 3dogs above, you should balance the cylinders during slow rev-up of engine. Well, the issue with my engine was that the balance between the cylinders changed while revs increase: for example, the 3rd was lower than 2nd at 3000 rpm but became higher when reached 4000 rpm. A bit the same between 3/4 and 1/2. So after hours long screwing I more or less got them all pretty similar, just 1 unit (Carbtune) difference, but the balance kept changing together with rpm. And for me a steady high rpm gave better adjustment opportunities than the reving-up.
And then also the idle syncing affected on the balance on high revs. I started with idle bypass screws closed, synced the high revs as good as I could, then did the idle sync, after which the balance on high revs had already changed, so needed to be adjusted again, after which the idle balance was changed, so did that again, and so on and so on at least 5-6 times until I finally got them all more or less in good balance. But as said, the pattern of different cylinders being higher on different rpms did persist. Especially between 3000 and 4000 rpm, the the showings on around 2000 were completely nuts, but I disregarded it as never use such rpm while driving.
It is also often recommended (Fred W) to do the syncing while bypass screws closed and on idle speed. In my case they were pretty out of balance on idle, but not in the same pattern while on 3 or 4 krpm. So for a while I was thinking which is more important, the balance on idle or on high revs, finally decided to do it for high revs as that is where I mainly drive. Don't know if that was a wise decision. Am going for a month long trip in 2 days, I am sure I will find it out then.
However, it was not at all as straightforward as I expected it to be from the writeups.
According to 3dogs above, you should balance the cylinders during slow rev-up of engine. Well, the issue with my engine was that the balance between the cylinders changed while revs increase: for example, the 3rd was lower than 2nd at 3000 rpm but became higher when reached 4000 rpm. A bit the same between 3/4 and 1/2. So after hours long screwing I more or less got them all pretty similar, just 1 unit (Carbtune) difference, but the balance kept changing together with rpm. And for me a steady high rpm gave better adjustment opportunities than the reving-up.
And then also the idle syncing affected on the balance on high revs. I started with idle bypass screws closed, synced the high revs as good as I could, then did the idle sync, after which the balance on high revs had already changed, so needed to be adjusted again, after which the idle balance was changed, so did that again, and so on and so on at least 5-6 times until I finally got them all more or less in good balance. But as said, the pattern of different cylinders being higher on different rpms did persist. Especially between 3000 and 4000 rpm, the the showings on around 2000 were completely nuts, but I disregarded it as never use such rpm while driving.
It is also often recommended (Fred W) to do the syncing while bypass screws closed and on idle speed. In my case they were pretty out of balance on idle, but not in the same pattern while on 3 or 4 krpm. So for a while I was thinking which is more important, the balance on idle or on high revs, finally decided to do it for high revs as that is where I mainly drive. Don't know if that was a wise decision. Am going for a month long trip in 2 days, I am sure I will find it out then.
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