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Re: Oiston Speed

To: Dick J <lsr_man@yahoo.com>
Subject: Re: Oiston Speed
From: DOUG ODOM <popms@thegrid.net>
Date: Tue, 07 Nov 2000 07:19:34 -0800
Dick; 4000 ft.min with a 3.48 stroke would be 6900 RPM.

Dick J wrote:
> 
> How may RPM does 4000 Ft. Min produce?
> 
> Dick J
> 
> --- DOUG ODOM <popms@thegrid.net> wrote:
> > Dick; 7500 will give you a piston speed of 4350
> > ft.min. Stroke (inches)
> > X 2 X RPM / 12 . That is OK if you have forged
> > pistons and steel crank
> > with good rods. Anything over 4000 ft.min. with
> > stock parts is scary.
> > Now I'm not going to tell you that I have never
> > built a dyno grenade
> > with lots of stock parts just to check some
> > wild idea I had. I would put
> > in a cam that made power in the 6500 range. You
> > can run it past that in
> > the gears getting up to speed because you shift
> > back to a lower RPM so
> > quick. I can give you a list of cams we have
> > used that fill that
> > bill.    Doug Odom in big ditch
> >
> > Dick J wrote:
> > >
> > > So if I read this right, once I get some Dart
> > > heads and a good cam kit, 7500 should be my
> > > absolute redline.  Obviously, I'd be safer at
> > > 6800-7000?
> > >
> > > Dick J
> > >
> > >
> > > --- DOUG ODOM <popms@thegrid.net> wrote:
> > > > Dick; Rev limit is determined by the stroke
> > > > and piston design in the
> > > > lower end. My E motor with 2.7 stroke at 9
> > > > grand has the same piston
> > > > speed as a 3.48 stroke ( 350 Chevy) at 7500
> > > > rpm. Valve float or bounce
> > > > is the Rev limiter in the top end of the
> > motor.
> > > >       It would do you no good to build a
> > motor with
> > > > a roller cam, rev kit,
> > > > and Titanium valves, then put the heads on
> > a
> > > > block with stock cast
> > > > pistons and crank. You can only go as fast
> > as
> > > > the weakest link will let
> > > > you go. You might go around to the local
> > roundy
> > > > round track and talk to
> > > > who builds the good motors for them. They
> > have
> > > > to live and make horse
> > > > power.                 Doug Odom in big
> > ditch
> > > >
> > > > Dick J wrote:
> > > > >
> > > > > Not knowing a lot about Chev small
> > bolocks, I
> > > > set
> > > > > a self-imposed red line of 6200.  I did
> > wind
> > > > it
> > > > > right to 6200 on my last run, and that
> > limit
> > > > > still managed to put me into the record
> > book,
> > > > but
> > > > > I'm wondering what a reasonable red-line
> > > > should
> > > > > be.  I don't want to be breaking motors,
> > but
> > > > I
> > > > > do want to see what it can do. This is an
> > > > > all-stock Chev 350, 4 bolts, stock
> > rockers
> > > > and
> > > > > springs in 882 (76cc) Chev head castings,
> > > > flat
> > > > > top pistons, and a cam that specs out at
> > 260.
> > > >  My
> > > > > plan for spring is to install an electric
> > > > water
> > > > > pump and electric fan.  The motor would
> > have
> > > > > wound just a little more this year, but
> > with
> > > > > those changes, it will hopefully have
> > just
> > > > enough
> > > > > more power to allow a little tighter
> > winding
> > > > > (valve train permitting, of course). What
> > do
> > > > you
> > > > > guys think the max RPM for that motor
> > should
> > > > be?
> > > > >
> > > > > =====
> > > > > * * * * * * * * * * * * * *
> > > > > *         Dick J          *
> > > > > *    (In East Texas)      *
> > > > > *         # 729           *
> > > > > * C/GRS   C/FRS    D/STR  *
> > > > > * * * * * * * * * * * * * *
> > > > >
> > > > >
> > > >
> > >
> >
> __________________________________________________
> > > > > >From homework help to love advice,
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> > >
> > > =====
> > > * * * * * * * * * * * * * *
> > > *         Dick J          *
> > > *    (In East Texas)      *
> > > *         # 729           *
> > > * C/GRS   C/FRS    D/STR  *
> > > * * * * * * * * * * * * * *
> > >
> > >
> >
> __________________________________________________
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> 
> =====
> * * * * * * * * * * * * * *
> *         Dick J          *
> *    (In East Texas)      *
> *         # 729           *
> * C/GRS   C/FRS    D/STR  *
> * * * * * * * * * * * * * *
> 
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