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
> >
>
--membersozdat-------------------------------------------------------
OZDAT Mailing List Please Note:-
Send (un)subscribe requests to [EMAIL PROTECTED]
Send submissions to [EMAIL PROTECTED]
No unauthorised redistribution of this email
http://www.ozdat.com/ozdatonline/index.htm
http://www.ozdat.com/ozdatonline/listindex.html
http://www.mail-archive.com/[email protected]/
---------------------------------------------------------------------
