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Originally Posted by Sneaky Pete
Looking at the 50% throttle oil flow graphs and picking the data point where the oil flow rate does indeed appear to have doubled from 21 GPM to 42 GPM with the increase in bearing clearance.
With the OEM bearings the 21 GPM covers the oil flow to the Vanos, main bearings, rod bearings, camshafts, piston cooling, chain tensioners etc.
So lets say of that 21 GPM, 7 GPM flows through the rod bearings.
With the increased clearance bearings the total flow increases from 21 GPM to 42 GPM, which can only be accounted for by increased flow through the Rod bearings (as nothing else has changed).
So by increasing the RB clearance we see the oil flow though the rod bearings increase from an estimated 7 GPM to a total of 28 GPM (7 + 21).
A quadrupling of oil flow though the rod bearing may initially seem appealing but its due to the increased clearance allowing the oil to haemorrhage out of the bearing at a greatly increased rate.
Increasing the ease of escape of the oil from the bearing will naturally also negatively affect the pressure of the oil wedge and the loaded oil film.
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This particular oil flow sensor was chosen after consultation with Dinan, Van Dyne, and Nascar guy. All three companies use the same Flow Technologies 0-15 GPM sensor on their engine dynos. The fact you think you see 42 GPM from a 15 GPM sensor, and didn't question it, tells me you're not at all familiar with the oil flow of car engines.
The 0-15 GPM oil flow sensor specifications are listed in the opening of post-1. The fact you missed this, and think you saw 42 GPM readings, tells me that you didn't read this article very closely, or didn't understand what you read.
There's two different scales on the summary graph: one in blue, the other in red. They're color coded for a reason to match the lines in the graph. The oil flow graph is in red, and corresponds to the scale on the right of the graph (also in red). That oil flow scale runs 0-15. It's impossible to read 42 GPM from that scale when it maxes out at 15 GPM. The fact that you didn't catch this tells me you're not familiar with reading technical data, charts, etc.
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There is zero data to support this.
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You have a long history of making comments without any supporting data. If you had any data to back up your claims, you could have presented them already. I'll trust the white papers by Clevite and King over a random internet guy with a long history, personal vendetta, and no SME credentials.
Pete, it's time to give this a rest. This article and the data is the worst case scenario for you and your agenda. You hoped oil pressure would be dangerously low. It wasn't, and barely changed. It's still well within BMW specifications. You didn't believe oil flow could be measured attributable to bearing clearance. You now seem to concede that point as well. Face it Pete, no oil pressure drop and double the oil flow, and using specs equal to BMW S54 rod bearings is about the worst case scenario for you and your agenda. Time to pack it up and find a new target for your energy.