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 *
> > > > * * * * * * * * * * * * * *
> > > >
> > > >
> > >
> >
>
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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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