powermandan
Well-known member
Bit of story, I rebuilt a AFN engine and sprayed the block etc.
The First thing that happened was the BV43 Turbo self destructed and snapped the shaft on the way to the tuners...
At the time I put it down to poor tuning (was surging badly) and maybe the oil feed, it had a dark side style universal oil feed. But when you consider the cross sectional area of the aftermarket feed Vs stock feed. The new part was actually smaller. So I replaced the turbo and increased the oil feed to 3/4 inch which is much bigger than stock and changed the oil etc.
Then on its next run out lasting around 1 hour, driving up and down hill doing some tuning runs.
It spun a big end bearing on number 1 which was completely destroyed and deposited in the sump.
So I'm rebuilding it again. Im unsure what caused the orginal failure.
Unfortunately I didn't have a dedicated oil gauge, so the next build will have one.
It was fairly obvious that there was swarf going round the system from the condition of the other bearings. The mains had a few scratches in them and one of the other big ends was down to copper. So maybe the turbo failing introduced swarf that ultimately finished of the engine. Or maybe it was oil starvation that destroyed the turbo and big ends.
So I'm doing my best to cover all the bases on this rebuild.
One of the things I'm conserned about is that, because the block was in bits for so long, flash rust had appeared on the flange where the oil pump bolts too. I didn't think too much about it on the first build. But as there is no gasket between the oil pump and flange, it now conserns me that maybe this is causing oil leakage and dropping the pressure significantly.
I'm considering using some RTV on the flange although no one seems to quote pressure ratings.
Opinions thoughts/ advice?
The First thing that happened was the BV43 Turbo self destructed and snapped the shaft on the way to the tuners...
At the time I put it down to poor tuning (was surging badly) and maybe the oil feed, it had a dark side style universal oil feed. But when you consider the cross sectional area of the aftermarket feed Vs stock feed. The new part was actually smaller. So I replaced the turbo and increased the oil feed to 3/4 inch which is much bigger than stock and changed the oil etc.
Then on its next run out lasting around 1 hour, driving up and down hill doing some tuning runs.
It spun a big end bearing on number 1 which was completely destroyed and deposited in the sump.
So I'm rebuilding it again. Im unsure what caused the orginal failure.
Unfortunately I didn't have a dedicated oil gauge, so the next build will have one.
It was fairly obvious that there was swarf going round the system from the condition of the other bearings. The mains had a few scratches in them and one of the other big ends was down to copper. So maybe the turbo failing introduced swarf that ultimately finished of the engine. Or maybe it was oil starvation that destroyed the turbo and big ends.
So I'm doing my best to cover all the bases on this rebuild.
One of the things I'm conserned about is that, because the block was in bits for so long, flash rust had appeared on the flange where the oil pump bolts too. I didn't think too much about it on the first build. But as there is no gasket between the oil pump and flange, it now conserns me that maybe this is causing oil leakage and dropping the pressure significantly.
I'm considering using some RTV on the flange although no one seems to quote pressure ratings.
Opinions thoughts/ advice?