for you franken L/Z engine builders

[scooter]

I found a shelf piston that will work for a frankenstein 2.4 L/Z engine better than cutting down a z24 piston.

 

This part is a toyota 2AZ-FE Piston. its an 89mm piston that has a 33.25mm compression height.

 

So if you use a Z24 crank cut down to fit into a Z22 block, L20b/Z22 Rods, 

L20B, Z20, Z22, L28diesel: 227.45mm

 

96/2+146+33.25: 227.25

 

yields a piston thats .2 mm below deck in theory... probably flush or slightly positive if the blocks been surfaced.

 

These come in two flavors aftermarket wise... 12cc dish which will yield 10.15:1 with an open chamber head and a 27cc dish which will yield a 8.44:1 compression ratio with an open chamber head

or 11.4:1 with a closed chamber head and 9.27:1, respectively.

 

The downside, its a dish piston with the valve reliefs in the wrong spot, and uses a 22mm wrist pin.

 

the valve reliefs wont really hurt it, as for the small end, hone it out 1 mm to a super fine finish and run the rod ends steel on steel or press fit them. Stock pistons are available in 88.5mm or .5 over for 150 bucks off ebay. the stock pistons are rated at 9.8:1 in the 2AZ and the pistons above are calculated at 9 or 11:1 in the 2AZ

 

So if using "junkyard" pistons then you would see 9.24:1 with an open chamber head and 12.2:1 or so.

 

There is also the 2AZfxe version which has a wayy smaller dish but i cant find those for sale anywhere or any info about those.

 

 

 

Edited November 7, 2018 by scooter