The scuffing I experience was in a 2.1 litre short rod stroker and it was a
shocker. All torque no revs. I have ultrasounded my L18W block and I think
88mm is the safest bore size to use. Reduced chances of cracking through
cylinder wall flex at high revs and greater reliability without sacrificing
too much swept volume increase.
If you wanna make them larger, stroke the crank (within reason) and use L16
rods. Much better way of increasing CR and volume.'
Regards
Brad
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Terry & Heather
Sent: Tuesday, September 05, 2000 11:41 PM
To: [EMAIL PROTECTED]
Subject: RE: L18 W blocks.....
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.
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
>
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