Agreed. But would be different...
At 04:06 PM 8/9/2002 -0400, Peter Long wrote:
>sounds like a lot of trouble, considering the known qualities of the SR
>and KA swaps....
>
>
>
> > -----Original Message-----
> > From: Thomas - Sweden [mailto:csp311@telia.com]
> > Sent: Friday, August 09, 2002 3:58 PM
> > To: datsun-roadsters@autox.team.net
> > Subject: Re: H25 engine
> >
> >
> > Long stroke 4-cylinders are Volvo S40 & V40
> > with 1948 cc (90 mm) no balance shafts.
> > Saab 2300 cc (90 mm) 2 balance shafts.
> > There was a rare FJ24 engine but it had
> > less than 90 mm. I think Honda makes some
> > really long ones. These are reasonably high
> > output engines with forged crankshafts. Long
> > stroke 4-cylinders without balance shafts are
> > not the smoothest running engines in the world.
> > Current production engines are going towards
> > longer stroke to compensate for low rpm torque
> > in 4-valve designs (fuel economy issues) but
> > many of them use counter balance shafts.
> > I've had a Nissan King Cab with a Z24 engine.
> > Long stroke 5, 6, 8, 10, 12 cylinder engines
> > dont have the same vibration problems.
> >
> > Thomas
> >
> > Marc Sayer wrote:
> >
> > > Adam Bradley wrote:
> > > > Stroke is 93mm. Maybe you can use an H20 crank in an
> > H25 block and get
> > > > like 2300cc?
> > > >
> > > > At 07:31 PM 8/9/2002 +0200, Thomas - Sweden wrote:
> > > >
> > > >>Hmm, I wonder about bore & stroke.
> > > >>If stroke is over 90 mm I dont want to
> > > >>be too close if it reach 6000 rpm.
> > >
> > > A 3.66" stroke isn't all that bad. Here is a Chevy V8 B&S
> > chart with the
> > > engines in that stroke range and longer. Some of these can
> > be made into
> > > pretty high revving motors, 6000 rpm for sure. :-)
> > >
> > > 325 = 3.780" x 3.62" ('99-later, Gen.III, "LM7" 5.3 Liter
> > Vortec, 6.098"
> > > rod)
> > > 346 = 3.900" x 3.62" ('97-later, Gen.III, "LS1", 6.098" rod)
> > > 350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette
> > 32-valve DOHC,
> > > 5.74" rod)
> > > 364 = 4.000" x 3.62" ('99-later, Gen.III, "LQ4" 6.0 Liter
> > Vortec, 6.098"
> > > rod)
> > > 383 = 4.000" x 3.80" ('00, "HT 383", Gen.I truck crate
> > motor) (5.7" rod)
> > > 400 = 4.125" x 3.75" (Gen.I, 5.565" rod)
> > >
> > > A TR6 had a stroke of 3.74" and they could be made to turn
> > 6000 easily,
> > > even with their old Brit technology and 4-main cranks.
> > >
> > > The issue is going to be the quality of the parts, the
> > weights of the
> > > parts, and the design parameters for the parts. And there
> > is where you
> > > may have issues. The motor is a forklift motor, I doubt if it was
> > > designed to see more the 4000-4500 rpm. OTOH you could use it as the
> > > basis for a good motor and just upgrade or rework some parts.
> > >
> > > --
> > > Marc Sayer
> > > Journalist, Photographer, Dog Trainer (APDT member #062956)
> > >
> > > Passions -
> > > Great Danes, auto racing and fast cars, my wife
> > >
> > > Dogs -
> > > Gracie, Tank, Delilah, PJ, & the rescue dogs
> > >
> > > Cars -
> > > 82 280ZX Turbo, 71 510 Trans Am vintage racer, 93 Ford E150
> > Tow/dog van
> > >
> > > My Homepage - http://gracieland.org
> > >
> > > Deaf Dane Rescue Homepge - http://gracieland.org/DaneRescue/
> > >
> > > Any Dane at the races is a Great Dane!
> > >
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Adam Bradley
'70 Datsun 1600 Roadster SPL311-28181
'67 Datsun RL411 SSS sedan RL411-11321
'66 Datsun PL411 sedan PL411-022447
http://www.picturetrail.com/abend
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