L Series Frankenstein Motors, Strokers, Turbo'ed, High Comp Options

[Ratsun]

Frankenstein motors:
Collect all the parts at pick-n-pull JY and buy it as a rebuildable $50 short block


Medium block 2.4 Liter

Stuff a Z24 crank and pistons into NAPS-Z or L20B block bored to 89mm by cutting down crank counterweights and clearance grinding block as per Ben Pila. This gives you a 2389cc L-series motor that doesnt require using defective (crack prone) Z24 block, fabricating timing cover, lengthening timing chain or modification to close hood. Z24 piston tops will need to be milled down slightly. Fedral-Mogul 33.8mm pin height pistons might not need milling?
Compression ratio with Z24 pistons and open chambered head is 10.25:1 before pistons milled.
parts: : modified Z22 block, modified Z24 crank, modified Z24 pistons, Z22S/ L20B rods
s/2+r+p: 227.7
piston deck height: 0.45 (above deck)


Stroker 2.3 Liter

Stuff a Z24 crank into a modified Z20/Z22/L20B block by cutting down counterweights as above. No piston modification or block boring needed for 2283cc L series.
see http://hobbslaw.nissanpower.com/custom2.html for an example
Russ noted that his deck height measured -1.77mm with the Z22E pistons that he first tried using, he eventually used milled Z22S pistons to achieve a higher compression ratio.
Parts: Z24 crank, Z22E pistons, Z22S/ L20B rods in a Z22 block or +2mm bored Z20/L20B block.
s/2+r+p= 96/2+145.9+32.1= 226.0 mm
piston deck height: -1.45mm below deck


Big Bore 2.3L

KA24 pistons into a bored Z20/Z22/L20B block. The small 2.8cc dish area of the KA24 pistons helps to preserve compression ratio even with the low piston deck height. Compression ratio with a open chambered U67 head is 9.9:1 or use dished Z24 pistons and peanut chambered head for 8.9:1 compression ratio.
Parts: Z22 crank, KA24 pistons, Z22S/ L20B rods in a +2mm bored Z22 block or +4mm Z20/L20B block.
s/2+r+p= 92/2+145.9+34.0= 225.9 mm
piston deck height: -1.55mm below deck


Longrod 2.19L/2.24L

Start with VG30E pistons and have the tops milled by 2.7mm to produce 29mm pin height. Custom pistons of similar specifications would also be recommended. Using the long Z20E connecting rods gives this engine a better rod/stroke ratio of 1.66:1. (stock Z22 rod/stroke ratio is 1.59:1). Start with +1mm VG30E pistons and bore the block +1mm to 88mm to gain a bit more displacement (2238cc). This engine with custom 89mm pistons is rumored to be the basis for the "rebello 2.3L".
parts: Z22 crankshaft, Z22 block, Z20E rods, milled VG30E pistons.
s/2+r+p: 227.5mm
piston deck height: +0.05mm (above block)


Long rod 2.1 L

I really like the possibilities for this 2.1L longrod motor.
Parts: L20B crank, Z22E pistons, Z20E rods in a Z22block or Z20/L20B block bored +2mm
s/2+r+p: 227.9mm
piston deck height: +0.05mm (above block)


Long rod L18

flattop Z20S pistons and peanut chamber head for 9.7:1 CR, better rod/stroke ratio for higher RPM.
Parts: L18 crank, L18 block, L16 rods, Z20S pistons
s/2+r+p: 207.66mm
piston deck height: -0.29 (below deck)


Low compression combinations for use with turbochargers


Turbo 2.2L

7.87:1 Compression ratio with 45.2cc open chambered head.
Parts: Z22 crank, 2.2E pistons, Z22S/L20B rods in Z22block or Z20/L20B block bored +2mm,
s/2+r+p: 224.4
piston deck height: -3.45 (below block)


Medium-Long Rod Turbo 2.05L

Use 32.1mm piston, 149.5mm rod from late Z22E. These rods are not as sturdy as onther L series rods.
Parts: L20B crank, Z2.2e pistons, Z22e rods, Z22 bock or Z20/L20B block bored +2mm over
s/2+r+p: 224.1
piston deck height: -2.85 (below block)


Short Rod L16

7.8:1 CR using 37cc cylinder head. Lowering compression of a L16 would be easier by just installing a open chambered L20B head and using stock bottom end.
parts: L16 crank, L18 rods, L24 (flattop) pistons, L16 block.
s/2+r+p: 205.2mm
piston deck height: -2.70mm (below deck)


Turbo L18

Use deep dished L20B pistons in a otherwize stock L18 for 7.63:1 compression ratio (using open chambered head) or bore +1mm and use dished 280Z pistons for 7.85:1 compression ratio

[Ratsun]

Pics and details of an L23 build here