Oil pump spline drive thoughts (fix for high rpm)

[Sergio]

The KL is not the only engine with weak oil pumps. Nissan RB26 has similar issues: Turns out minimal drive contact and excess clearances hammer the pump at high rpm and it breaks apart. Nissan has one contact point, the KL has two. Source: http://www.skylife4ever.com/2011/01/...-oil-pump.html

The solution: Copy a successful design (Toyota 2JZ)
http://www.skylife4ever.com/2014/08/...urce=BP_recent
http://www.gtr.co.uk/forum/270049-sp...ump-gears.html

You'll recall the big killer of the stock oil pump on the Skyline is precisely hard rev limiter slams on the narrow contact patch - it's easy to see how a spline drive would solve this problem very effectively when considering, that with the splines you pretty much get contact of all splines equally distributing the force and you have the oil film between the splines as a damper as well. In most cases there are no issues with alignment during installation, you fit the pump to the block just like you would with an oem pump.

I'd imagine the cost to custom make one set for the KL would be insane unless you have a 3D scanner and a machine shop at your disposal. I know there's a few external oil pump setups out there that are doing well just thought I would share this.

[dillinr]

You have my attention.

This would be a fantastic thing for the handful of high RPM KL guys, and appears it may be cheaper or equal to an external oil pump setup, and certainly easier to install, once all the blueprinting and machine work is done.

Now I wonder how close those oil pump internals and gears are to the KL, and how much extra work it would be to re-engineer the same idea for the KL. Anybody care to guess?

[DIY_Si]

How much does the flat drive on the KL crank contribute to oil pump failures? And how much towards oil pressure issues? I thought, although I might be wrong, that the pump started to cavitate at high RPM, causing a sudden drop in pressure just when it was needed most. I don't see how a spline drive would prevent that.

[dillinr]

Good point. I jumped to the assumption that if it was a valid fix for one car it would apply to another.

[DIY_Si]

That's just it, from reading those threads it cures smashed pump drives in skylines rather than extend upwards the pumps peak RPM. That's not something the KL suffers with. We've got plenty of other worries of our own!!