16-01-2020, 07:26 PM
Two things come to mind.
This first is that, whilst you say you have a spark at each plug at the right time, the spark may be degrading after a few revolutions. However, I imagine this is not the case since you have a new fangled electronic system. All the same it might be worth fitting your ignition to a friend's Seven to prove it is good.
The second is sticking valves. You mentioned you've fitted new springs but that the engine has sat for some time. When I had low compressions, similar to what you have on all four cylinders, on a couple of mine the cause turned out to be sticky valves. My engine had double valve springs but had not run properly since I got the car.
Good luck!
This first is that, whilst you say you have a spark at each plug at the right time, the spark may be degrading after a few revolutions. However, I imagine this is not the case since you have a new fangled electronic system. All the same it might be worth fitting your ignition to a friend's Seven to prove it is good.
The second is sticking valves. You mentioned you've fitted new springs but that the engine has sat for some time. When I had low compressions, similar to what you have on all four cylinders, on a couple of mine the cause turned out to be sticky valves. My engine had double valve springs but had not run properly since I got the car.
Good luck!