27-02-2020, 12:06 PM
John,
There was an issue on early Phoenix cranks that the front web touched the lip - also they were very close to the centre cam web. This might have some bearing on your situation.
I would certainly urge you to check the front lip position is correct, irrespective of the gear mesh (which can be fudged).
In particular I would check clearances between big ends & cam lobes.
I think shimming the front bearing into the right position is a good way to go, but if it's moving forward you might do better to have the thing machined to the right depth and have done with it. I don't think I'd remove material from the gears though.
As for running with an offset, yes there is some precedent e.g. Reliant conversion and I can dig out the numbers for you if of interest. However better to sort it out if you can.
There was an issue on early Phoenix cranks that the front web touched the lip - also they were very close to the centre cam web. This might have some bearing on your situation.
I would certainly urge you to check the front lip position is correct, irrespective of the gear mesh (which can be fudged).
In particular I would check clearances between big ends & cam lobes.
I think shimming the front bearing into the right position is a good way to go, but if it's moving forward you might do better to have the thing machined to the right depth and have done with it. I don't think I'd remove material from the gears though.
As for running with an offset, yes there is some precedent e.g. Reliant conversion and I can dig out the numbers for you if of interest. However better to sort it out if you can.