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Franzh, sorry for my english. Bu we DIDN'T grooved the BEARINGS at all. We left them stock. We grooved the main CAPS and the block. To have a constant feeding of oil to the bearings... Fabio

Well we didn't alked specifically about this kind of modification on the crankshaft. we didn't discussed what could be the benefits and the cons. It would be very interesting.

3.4 liters engine 6 cilynders inline. We bought a stroked crank that had a stright shoot oiling system. Previously we were using a 3 liters not stroked with cross drilled oiling system. The 3 liters engine was revving at 10500rpms with no problems. After 7k miles we removed it to swap it with...

ok I have some news: It really seems like the pump is not flowing enough oil for this eninge. More exactly. For all the mods we made to this engine. Ok here are our thoughts: we made some experiemnts. 1) we brought the pumps rpms higher. We used a ratio of 1:1. We wanted to see and log with...

Smokey, Mike and all the others, this forum is an amazing place! :) Now I am pretty sure that the problem resides in the full grooved mains. I have been searching about this topic on google but I have found almost nothing... No real comparison/benefits/pro/cons between full, 3/4 and half...

yes sure 100% why? We use a lot of boost...

Hemi, actually I have a gauge in the exhaust side of the turbine. At 39psi of boost we read 26psi in the exhaust. I think it's pretty good. But I was wondering if it could be worth to use a smaller exhaust A/R to raise a little bit the backpressures and make the turbo spool quicker. Without...

What would be an optimal pressure ratio? Actually we have archived 1:0,67 (1 in the intake - 0,67 in the exhaust)

We have checked for oil leaks and air leaks.... all is perfect... I wonder if the problem is that this engine really wants more oil then usual.... the crank have been modified by us: it was a striaght shoot crank. We have added an hole on the rods journals going from one side to the other of...

GregLocock, what do you mean? can you explain? :) Thanks

I have an update: we have tested the engine at 8krpms. We have even more flow ( 20gpm ) but even less oil pressure (about 60psi of oil pressure...) So the flow increases but the oil pressure go down and down... At this point is it a problem of a too small oil pump?

Milanoguy, I am using the MOTUL 300V competition oil.Not sure about the level of detergent inside it. I have an hole in the head where originally were palced the hose for the oil vapours. I will use that place to do the test. But I don't think that even if the oil is foaming it will be so bad...

Smokey if that is the case how to fix it?

qwester, we have been thinking about that indeed. About the fact that we could not have a real problem. But, why at 4k engine rpms we have absolutely no oil pressure drop while we have at 6krpms? Maybe as at 4k engine rpms the oil pressure is way over the relief valve point? We have set the...

We have been thinking about the relief valve but it is working properly: the valve is inisde the pump. We have removed it and inspected but it looks ok. we even tried to use teh pump with the valve completely forced to remain closed (we removed teh spring and replace wit with a bar) but still...

We have built a race engine. It's a 2jz-gte supra 3 liters engine and we have applied a dry sump kit. We are actually using a peterson gerotor 3 stages pump rated at 18/20gpm (at how many rpms?) We have a 5 gal tank in the trunk and a -16an line going to the pump and -12an line pumping oil...