Craig,
Just catching up on the back log.
Bore & Stroke for the L18W 1889cc works engine is 87.8mm x 78mm. This is the
capacity used in the 710 SSS privateer spec WRC, it had 2x44mm Mikuni and
produced 170hp. The works teams use a 1941cc engine which had a DOHC head
and two huge jugs ~50 something mm and produced 210hp The figures that you
will see quoted in some guides are the tolerance allowed for competition ie
usually +1mm as that was allowed in those days for most forms of racing.
Nissan considered 87.8mm a very safe bore for that engine and theoretically
will tolerate 88.8 or 3" bore but mine has never been bored so I can't
comment on the 3" bore. I think Brad has and experienced scuffing? cant
recall if it was that engine or another variation.
terry
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Craig Overend
Sent: Friday, 25 August 2000 7:07 AM
To: [EMAIL PROTECTED]
Subject: Re: L18 W blocks.....
Terry,
do you know what bore & stroke size the 1889cc 710 SSS used? Was 1889cc
the actual capacity used in competition? I ask because 88.8mm works out
to 1932cc using a 78mm crank. To get 1889cc you need 87.8mm bore x 78mm
stroke. Did Nissan consider 87.8mm to be a safe diameter I wonder?
Interestingly this gives a stroke to bore ratio of .89 which is near
ideal for this engine.
According to "How to Modify your Nissan/Datsun OHC Engine", Nissan
87-88.8mm sealing rings were available but were required to be .51mm
larger than the piston diameter or a step in the top of the piston to
clear. This would agree with the up to 88.8mm but at what reliability?
How did you come about 88.8mm?
regards,
Craig.
Terry & Heather wrote:
>
> Andy,
> L18W blocks are very nice, not exactly rare but they are made in Japan
and
> were sought after by Datto engine builders from yester year. I know that
> they can be bored out to 3.5" or 88.8mm as Nissan Motor sport used the
L18W
> block in the 1889cc 710 SSS world rally car. I wouldn't have thought an
A87
> head was that hard to find but I could be wrong as I haven't looked for a
> while. I'll put the word out around here (Canberra) for you.
>
> regards
>
> Terry
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Andy Nielsen
> Sent: Monday, 21 August 2000 9:46 AM
> To: [EMAIL PROTECTED]
> Subject: L18 W blocks.....
>
> Dear list,
>
> On a search of the local wreckers for a decent A87 head for a 2 litre
motor
> I am chucking together, I stumbled across 3 L18 W blocks. The wreckers
had
> no idea what they were. And I heard they were rare. Hah. What are they
> worth? How far can you bore them? Where the hell is a decent A87 head?
> Thanks peoples!
>
> Andy.
> ________________________________________________________________________
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>
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