Tom,
The combo sounds good to me. The only change I would make (if they were
available) is to use L14 rods (3mm longer again than L16 136.65 giving
1.752 rod stroke ratio). I would then skim the dish of the piston crown and
deck the block to suit. I would use the V91 head with welded chambers 44mm
inlets and 36 exhaust's and a good 40mm+ port job. It would be 8000 rpm
material easily with some good valve springs. Balancing is cheap!!!
The Z22 pistons are readily available and the genuine Nissan ones are very
strong.
Cheers
Feral Errol
----------
From: Zac Campbell <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: Frankenstein L's
Date: Wednesday, October 25, 2000 9:14
Pistons should be available somehow. Even if you give the dimensions to a
piston manufacturer there may be something else from another manufacturer
that is close/the same.
zac
----- Original Message -----
From: Tom Richardson
To: [EMAIL PROTECTED]
Sent: Wednesday, October 25, 2000 7:49 AM
Subject: Frankenstein L's
Hi List
During one of #ozdat's late night crackpot ideas sessions we came up with a
frankenstein L which sounds surprisingly good. Its the same as the long
rod L18 from Jason Gray's frankenstein page, but with a +2mm overbore to
accomodate Z22S pistons. The long rod big bore L18 was born! Capacity is
1854cc, rod:stroke ratio is a favourable 1.705:1. The Z22S pistons sit a
further 0.06mm under the deck, slightly lowering the compression ratio.
L18W block +2mm overbore, L18 crankshaft, L16 conrods, Z22S pistons
With a peanut chambered W53 head (39cc chamber) this would give a 9.06:1
compression ratio (super won't be around forever), or with an open
chambered U67 head it would give 8.2:1- not toooo bad for low boost
turbocharging. If somebody wants to build this as a race motor, find
yourself some flattops and shave the deck for 11:1)
It almost sounds too good- reasonable capacity, would rev pretty hard (to 7
or 8k probably), simple head swap for turbo! Might be expensive getting
the whole setup balanced well enough for a 7000rpm screamer though.
Comments? How hard are Z22S pistons to come by, are they usually okay
strength wise? Errol, Terry, pick holes guys :)
- Tom
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