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hi, how about getting the crank
ground????
with all that extra meat coming off the main
journals, get it offsett groung and end up with a bit more stroke
!!!....
mark k
----- Original Message -----
Sent: Wednesday, March 19, 2003 9:37
AM
Subject: Re: L20 crank into L18? Good,
bad or ugly?
Now that`s what i call a
"Grunter"!!!!
Kris.
----- Original Message -----
Sent: Wednesday, March 19, 2003 9:14
AM
Subject: Re: L20 crank into L18? Good,
bad or ugly?
Nat,
Its been very entertaining reading some of the
advice from the lads, however i think it may be rubbish. true the L20
B crank has 5mm bigger main journals as does the Z20 , and this is a good
thing because then you wont break the crank after about 5 rallies. to do it
properly you would need to get the L18 line bored ($150-300) and use
the normal L20 main bearings, get the crank nitrided and it will take 100
rallies+
If you are on a budget you can use late 1600 or L24
conrods Z20 or Z22 standard pistons and with a few "adjustments" to the
block you can have up to 2092cc in an L18 block 100 %reliable with
standard bits as if nissan made it themselves !
I wouldnt worry to much
about calculating stroke rod ratios, bore flex , good or bad crank to
piston angles????
I can tell you this because its been done like that
for 20 years in australian rallying with the usual datsun reliability, it
turns out to be stronger and more reliable than with an L18 crank because
you dont have to rev the date out of it. this is a very good thing in the
bush, being able to get it up on cam straight out of every corner and up
every hill , torque is what you want and bigger crank is gold !
if anyone
wishes to stress about rod angularity or scuffed pistons then try a Z 22
crank ( 92 mm stroke instead of the L18s 78 mm) with 1600 rods, very
short custom pistons, an 89mm bore, all resulting in a 2.3 L L18 that
is happy to rev all day to 7500. this engine may be on the edge but i have
built 2 like it , and datrally in melbourne once did one with a 94 mm sroke
and 90mm bore giving 2.4L. and geuss what, they all lived happily ever
after!
My 2 engines like this have each done 2 years of rallying (causing
many tears for wrx and evo competitors) without anything but regular oil
changes.
so it sounds like an exelent and safe bet to put in the
L20 crank so let me know if you are after more info ! and please tell me
about the rest of the
car.
mark [EMAIL PROTECTED]
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