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, Yahoo!
> > Experts has your answer.
> > > http://experts.yahoo.com/
>
> =====
> * * * * * * * * * * * * * *
> * Dick J *
> * (In East Texas) *
> * # 729 *
> * C/GRS C/FRS D/STR *
> * * * * * * * * * * * * * *
>
> __________________________________________________
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