Wondering if my stock l18 bottom end would make more power and or torque than my old stroked l16 with flat tops.
Same l18 crank and l18 rods just smaller bore in l16 and l16 has l24 flat tops in it.

Six of one, half a dozen of the other ??

Stock L18 may make slightly more torque, due to slight capacity increase, stroked L16 may make slightly more power due to compression increase. I don't think there would be much in it either way.

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1970 ex Group A Rally P510
1971 P510
1972 180B SSS
1965 SP310 Fairlady
1966 SP311 Fairlady

Thats what I was thinking. A bit less torque may be kinder on the sss box

L16 with L18 crank, L16 rods and shorter milled or shorter height comp 85mm pistons would be better than stock L18

edit: some have used Z20 pistons of some sort

What will be the crank stroke, and the rod centre to centre length of each variation?
A shortest pin height piston is prefferable.
Depending on meat/thickness in the crown, can always dock a bit off the piston top.

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Yep, i race a Datsun, and I drive a truck, sometimes I get confused, and then the truck goes fast, and the Datsun gets a lot of boxes shoved into it. AWW GEE

Not sure on the measurements jason, it was the old motor out of my 1200 so all I remember are the parts. I didnt screw it together just know l18 crank l16 rods ans 240k/z pistons (flat tops).
Went well on lpg would go better with petrol that im sure of

L16 stroker feels more punchier and revs cleaner then the l18 did. Plus it doesn't ooze oil from the rear main or sump.

Now about building a long rod l18.

Got the l18. Got crank got l16 stanza rods. Is it just machining 3 mm off the l18 pistons for flat tops or are there pistons to suit stock bore?

Just as you said, machine the difference of the rods off the face of the piston too make flat tops. It works out that the dish on a std l18 piston is completely removed so the piston crown should be just as strong

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Chris Thomas

1971 1600, mild L18, 5 speed

All I want is less to do, more time to do it and higher pay for not getting it done.

I seem to vaguely recall that 280ZX pistons were the ones to use, but I could be wrong too.
Also better with 240K rods, bit beefier section and bigger bolts than the L16 rods

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Happiness is watching the race.... in your rearview mirror

My L18 runs 1mm oversize L28 pistons.

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Original 77' 260Z 2+2