Yet Another 'Building an L28' Thread

[Riceburner]

What size does that oil feed hole on top of the block need to be drilled out to? I never did that 

 

I've read about people cross drilling the mains on the crank for better oil supply, is this common?

[dat2kman]

3mm is all it needs to be, but mate it with the higher vol pump, and pack behind the press relief spring, 3-4mm of washers.

Thhey dont need cross drilling to crank, unless extreme race use, and dry sumped with much bigger volume and flow rates.

Windage trays, trapdoor baffles and wings on the sump help certainly in large fast sweeping bends

[DOOM]

Do what Dave1600 did.

You are way overthinking your comp ratios.

Yes flat tops, longer 133 mm rods, a low cost piston look at Isuzu G200 units, and machine top off to suit final deck height.

Use regular type head gasket, no need for MLS or big bore /oversize type gasket,

 

Yes the PMC /Les sourced upper head stuff is better than the rest out there, and fairly easy to get.

 

I'm looking at getting some ITM pistons (Isuzu's sound good), I hear meant to be good for the money.

 

What is the 'upper head stuff' is it valve train components springs/rockers, do they have names? a link? please? or do I need to talk to Les Collins/PMC?

I've read about the oil gallery plug tapping in the how to modify book. I'm making a reliable street motor that, so I wont be rebuilding it every race season (so does it really apply?).

I'm taking on all your advice as much as I can. I'm currently in Melbourne selling off an L28 EFI manifold (and other reasons, 2 birds 1 stone) so I've had no internet.