Paul,
I'm told that the L20b blocks cast in Japan are much better than the locally
cast ones, so try and lookout for an identifier such as NISSAN JAPAN or
similar. The locally cast ones are softer and wear quicker.
Also, if the budget allows, a better way to increase compression than
shaving the cylinder head is by using a 39cc (W53) or 41cc (A87) closed or
'peanut' chambered head (easy to tell them from open chambered heads, the
combustion chambers look like peanut or kidney shaped) as opposed to the
open chambered 45.2cc U67. In addition to increasing compression, the
peanut design is more resistant to detonation. I had the intake ports on my
W53 opened to 40mm, and it flows really nicely.
Shame the rings on that motor were stuffed, so all the extra compression
just got blown past the pistons, but you get that sometimes ;)
- Tom
PS I also ran 1.5" SU's on this motor and with a pretty feral camshaft,
still got 25-30mpg when it was treated well (not often :) I've also heard
that the stock 1600 carby will make a L20b run like crap, a member of the
1600 club has a 240K carb on his (pretty much stock) L20b which makes it run
much nicer. Worth a look maybe!
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Paul W. J.
Stanley
Sent: Saturday, 24 March 2001 10:47 PM
To: [EMAIL PROTECTED]
Subject: Re: L20B mods.
Thanks for the info Ken. I'm thinking of adding a few 'bits' to my 1981 200B
L20B. Does anyone know the difference between the L20Bs that came out in
various Datsuns? I guess the 'desirable features' is all you need to know.
I can get some extractors and the electronic ignition. Is there a different
water pump for the auto? My motor is from an automatic. I can also get the
clutch and flywheel, and a 'big' cam. That's the only info my friend has
about it...he says it's extreme.
I wouldn't mind DIY port work too...might look into that. I've got a ye olde
carby...I dont think I'll get twin SUs because I'm a cheapskate on fuel (you
have to use PULP with 9.5:1 don't you?)
Paul
----- Original Message -----
From: Ken Abraham <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, March 24, 2001 3:47 PM
Subject: Re: L20B mods.
> G'day all,
>
> Some things to consider for a mild L20B
> I have done these things to my motor and am reasonably happy with the
> results, there is a significant increase in performance and change of
> 'character' compared to stock L20B.
> I have included approximate prices if you get parts from U-Pull and
Trading
> post.
>
> 1. Start with S2 Bluebird Motor (check for bore wear!). Desirable features
> include, big valves, 264degree SSS camshaft, strong crank, lowish mileage.
> cost 2nd hand $100
> 2. Electronic Ignition (From some Bluebirds) cost $50
> 3. Automatic transmission water pump and fan (i.e viscous clutch, fan does
> not spin faster than 2500 Rpm) cost $25
> 4. 6 cylinder flywheel and clutch (1 kilo lighter, bigger clutch, very
> noticable performance boost in 1st gear) ;) cost $40
> 5. Extractors. cost $ 50 - $100
> 6. Twin SU (Genuine) carburettors on SSS manifold. cost ~$150
> 7. Port work. Open inlets to 1.5 inches for SSS manifold, modify horrible
> factory exaust port. cost ~$10 for bits and pieces needed to DIY
> 8. Shave head ~1mm to increase compression to about 9.5:1 cost ~$30
> 9. Gasket kit and sundries cost ~$150
>
> All up about $600 - less if you shop around and buy wisely.
> Regards,
> Nick
> 1978 Datsun Stanza
>
>
> ----- Original Message -----
> From: Brian K. <[EMAIL PROTECTED]>
> To: Thudd <[EMAIL PROTECTED]>
> Sent: Friday, 23 March 2001 3:06 PM
> Subject: Newbie
>
>
> > Hello all on the list!
> >
> > I have an old faithful 180B which has served me well for many years,
> > however the engine is now approaching the end of its life. I could get
it
> > rebuilt, but for not much more I can get a new engine and have that
> > done. I asked one workshop on the recommended option, and he suggested
an
> > L20B motor. This seems like a good option to me; it's an easy swap and
> I'm
> > not trying to make a performance car out of it, just something with a
> > little more urge than normal. However, anything that I *can* get out of
> > it, I *will* (within a fairly tight budget; I don't want to spend heaps
> and
> > gain little).
> >
> > So what advice can anyone give on an L20B swap into an 180B? What can
be
> > done to the engine during a rebuild that would extract a little more
> power,
> > without going overboard? By 'overboard', I mean I'm not interested in
> > building some 200HP race-ready monster. This is my daily driver, and
> > spends most of its time doing a highway commute.
> >
> > The workshop suggested putting a different head on the motor; I can't
> > remember which one but he said it'd be about $400 extra (including
> > polishing etc). A new exhaust system will definitely go on, I just
don't
> > know what yet.
> >
> > Thanks in advance,
> >
> > Brian K.
> >
>
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