29-11-2020, 04:06 PM
I have no experience of Speedy engines but I do run a pressure-fed 3-bearing engine with deep sump.
The oil pump is A7 but with slightly increased eccentricity.
I generally expect to see 50 psi on cold start dropping perhaps to 35 or so at idle when hot.
If feeding big ends from the front of the shaft 20psi sounds a bit low to me.
For what it's worth, I measured oil temperature a while ago with a deep sump - in winter - and even after an hour's run it didn't rise above 60 or 65 degrees, which isn't really hot enough. If using a deep sump I suggest putting less oil in it (i.e. filling only to standard oil capacity).
The oil pump is A7 but with slightly increased eccentricity.
I generally expect to see 50 psi on cold start dropping perhaps to 35 or so at idle when hot.
If feeding big ends from the front of the shaft 20psi sounds a bit low to me.
For what it's worth, I measured oil temperature a while ago with a deep sump - in winter - and even after an hour's run it didn't rise above 60 or 65 degrees, which isn't really hot enough. If using a deep sump I suggest putting less oil in it (i.e. filling only to standard oil capacity).