29-06-2022, 09:31 AM
(This post was last modified: 29-06-2022, 09:33 AM by Hedd_Jones.)
(28-06-2022, 08:14 PM)Nick Mayne Wrote: Well Pigsty have answered and also they emailed me that they use a fixed timing on all their engines. This does not concur with Hedd Jones post above as the Pigsty timing is fixed. I guess they welded together my weights when they tuned the engine although the main aim was to reduce excessive fuel consumption. This does go against the grain with me with all my previous knowledge (or lack of!) but I guess the dynamometer experiments must be right. Too late as I have fitted a new DK4A and Power spark have told me that their DK4A distributor starts advancing at 300rpm then rises steeply to 8 degrees at 600rpm then has a max advance of 10 degrees at 2000rpm. Seems to start (no kick back on handle) and run well now but some of that is due to the new CW&P which is more or less as per the original in 'The Source Book' ie more turns of the engine.
So this revelation from Pigsty confounds a lot of the online articles and maybe we will hear more! After all they build successful racing cars.
No my post agrees with Alex. Following the period Austin manual advice means the timing would be fixed for driving round - at full advance, which is a lot less than an auto Bosch would give you.
The advice is that it should be started set fully retarded. As Alex notes, so it won't kick you on the handle.
I used to forget occasionally, particularly in traffic when the swine stopped and I had to get out to swing the handle, and I instantly knew I'd forgotten
Anyone know what RPM a 7 idles at?. Sounds to me the powerspark is starting to advance as soon as the engine is running. Even 600rpm isnt a lot.