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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