Oil Restrictors

[Dale FZ1]

Looking at the oil feeds, who here follows the method of driving the original restrictors further into the block, and who has taken them out before installing new ones?

If removing the old ones is it a screw and slide hammer job?

[Swiper the Fox]

knock em in

[Coolwhip1]

yea i always knocked mine into the block as well.

To remove them it's a slide hammer deal, no threads.

[Dale FZ1]

Thanks My only thoughts were for avoiding pushing it too far down and becoming a floating obstruction. If removed I guess it gives me some access to clean galleries before installing the new ones.

[TiTAN]

You can always take the block to get acid bathed if you want it fairly spotless.

[Dale FZ1]

It will be getting a good clean out, no worries about that

After spending max 30 mins from start to finish on removing the original restrictors, I'm now of the view that there is no reason to leave them in.

Very simple - drilled the hole oversize, tapped in a 5 x 0.8mm thread, sat a socket or tube over the top and then wind in a metal thread. VERY EASY. I was expecting something difficult, given the various threads that promote the idea of knocking them down further.

[Cubes]

Dale. What did you settle on?

Left both unblocked and simply restricted them down a tad?

[Dale FZ1]

1.6mm (front) / 1.2mm (rear)

Overall, the comments by SK and his table steered me towards a conservative approach given it is predominantly a road car and with fairly stock RB30 internals won't be seeing revs over 7000 or for an extended time. Something more competition oriented would probably be better suited to the single 1.5mm restrictor, but I gathered it's all about the combination and its use to determine what way to go.

Sump upgraded by ~ 1 litre capacity, increased drain back capacity, and a return to sump catch can should easily keep any issues under control for this application.

I feel that lifter bleed-out will be controlled by using oil spec at 10W60 and retaining a second feed will also be a help at start up and cold idle.

Should have some idea in a couple of weeks.