Brad I'm building up an L18W block 2L engine. My piston budget will
probably end up depending on what piston pin height I can find to do the
job. I'll be starting this weekend on the block when I get it. I'm
waiting on the wrecker to pull it to check that it's a genuine 720 L18W
block with a 6 bolt crank and flywheel.
Craig.
Brad HALLETT wrote:
>
> Craig
> What block do you want to use, and what is your piston budget?
>
> Regards
> Brad HALLETT
>
> Proudly Endorsing:
>
> DATRATS
> Datsun Dedicated
> For Nissan Motorsport Components
> Professional Budget Priced competition equipment
>
> http://203.33.35.34
> Contact Errol SMITH
> mailto:[EMAIL PROTECTED]
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Craig Overend
> Sent: Thursday, September 07, 2000 1:33 PM
> To: [EMAIL PROTECTED]
> Subject: Re: L18 W blocks.....
>
> Brad,
> Do you know the minimum wall thickness after you ultrasounded the
> block? I can probably use this to work out a required rod to stroke
> ratio for reliability.
> L20A rods are another option if you can get them. I'm pretty sure
> they're 135mm. Anyone know for sure? I'm assuming the block is the same
> height as L16/L18/L24/L26(207.8) and they used 38.1mm pin height that
> gets
> L20A stroke = 69.7
> (69.7/2)+38.1+135 = 207.95
> leaving piston 0.15mm above block deck, exactly the same as the L16.
> They would probably require bigger rod bolts.
>
> Craig.
>
> Brad HALLETT wrote:
> >
> > 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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