Keith,
I have to agree with Tom, that high of RPM will cost you more than you will
gain. We have drag raced that combination in the past and would not run
alumunium rods unless I know exactly how many runs were on the rods and at what
conditions the motor saw...how high was it reved, how often, etc. The other
thing is valve springs. We ran a 287 inch combo, 8700 off the line, 9200 shift
point and 9700 in the lights. It ran on the record but... broken valve springs,
spanned rocker arms, cracked piston lands, etc ( read that total motor trauma
). Why not use a set of Crower steels ( nice rods and reasonable priced ) and
keep the r's down. Wearing a motor out is a financially rewarding thing!
>>> "Thomas E. Bryant" <saltracer@awwwsome.com> 04/14 5:22 PM >>>
>From the description of your motor, I still stand by my RPM comments. Sounds
very similar to the motor I ran a few years back. I ran Crane heads that were
excessively milled to get a 52 cc. chamber. I am now running Chev Bow-Tie Heads
that are
angle milled to the max, trying to maintain the 12.5:1 compression ratio I was
running with the other heads. My pistons regularly contact the heads very
lightly. I am now using steel rods, but in the early eighties, Terry Elledge
was helping me with my motors. He built one that had approximately 13.5:1,
using Bill Miller aluminum rods. The third pull (7700 RPM) on the dyno put #1
rod on the floor. All the pistons were "hitting" the heads. As a Nascar engine
builder, he normally use the steel rods, so I think he miscalculated the amount
of stretch.
Just remember that the 1/4 mile top RPM is for a couple of seconds, much
different than at the Salt. What is a problem at 9000 may not be at 8000. I am
a firm believer in "the combination". Each racer has to find what works for
him. It is kind of like cooking, two cooks can use the same recipe, but the
results may be much different!
Tom
Keith Turk wrote:
> The Heads on the motor are old 292 castings... the angle plug things...they
> were done by Hogan there in California somewhere... they have an intake
> port size of 2.250 X 1 something... with about .200 off the surface... the
> block is not o-ringed..
> and the crank is a 302 crank turned down to a 2.90 Stroke.... it has been
> exceptionally well balanced and is set up with a set of Aluminum Super
> Rods.. which are 5.75 inches... The pistons are TRW Duffies that have been
> worked a little to much in my opinion.. that was the comment on the ring
> land... they are gas ported and with the Heads being shaved as much as they
> are... well you can start to see my concerns...
>
> It started life as a Darrin Davis Comp eliminator motor and was spun up to
> 10,500 Rpm and left the line at 7500.... My thoughts right now are that our
> hero the original builder didn't take into account Rod Stretch.. and that
> is why the pistons touched the heads and the valves had mated with the
> pistons.... none of this is hurt particularly... they had just touched..
> and closed the top land a tick. maybe 2 thousands.... or so..
>
> Lift on the cam is another factor here.... I haven't mic'ed it yet but I
> believe it to be around .650 total..
> Complete Roller set up...
>
> it has a jesel belt drive
>
> Well that is what I have to work with.... I am still thinking the spare 355
> cu in 10:1 motor is going to the salt... at least I know it will live out
> there..... and we can still enjoy the time of our lives....
>
> Keith
> ----------
> > From: Thomas E. Bryant <saltracer@awwwsome.com>
> > To: kturk@ala.net
> > Cc: Land Speed <land-speed@autox.team.net>
> > Subject: Re: Salt & RPMs
> > Date: Wednesday, April 14, 1999 11:23 AM
> >
> > It depends on what you have in the motor, but I have found that lower Rs
> work
> > better.
> > At the higher RPMs, the breathing efficiency goes downhill. We used to
> run in
> > the low 8000s, but have found that the upper 7000 range works better for
> us. It
> > is also a little easier on the motor. But again it depends on the power
> curve.
> > Tom
> >
> > Keith Turk wrote:
> >
> > > Well said.. and of course he is my first choice also... I am trying to
> be
> > > semi neutral here.... This is a ton of work and worth while... If Al is
> the
> > > pick... then I would get us going in the right direction....But let's
> hang
> > > out a bit and see what everyone thinks....
> > >
> > > Hey by the way the motor is coming along just fine.... the pistons top
> ring
> > > land is a little closer to the top then I would want.... but I am going
> to
> > > run it on the first and see what we have to work with.... oughta be an
> > > absolute blast to run that kinda RPM..... I am going to set the gears
> to
> > > take me through the trap at around 8800Rpm... well below it's normal
> max on
> > > a drag strip.... but what I consider a livable RPM for the Salt....
> Keith
> > >
> > > ----------
> > > > From: Thomas E. Bryant <saltracer@awwwsome.com>
> > > > To: John Beckett <johnbeck@blueridge.cc.nc.us>
> > > > Cc: Land Speed <land-speed@autox.team.net>; Keith Turk
> <kturk@ala.net>
> > > > Subject: Re: Street Rodding and IMHOF
> > > > Date: Wednesday, April 14, 1999 7:59 AM
> > > >
> > > > Hi John & Fellow LSR Supporters,
> > > >
> > > > I have been reading the chatter about the Hall of Fame considerations
> and
> > > would
> > > > like to put in my two cents worth.
> > > >
> > > > I agree with you John when you put Al Teague at the top of the list.
> In
> > > my view
> > > > there is a great deal more to being qualified for "Special
> Recognition"
> > > than going
> > > > fast. I have known many people with fast cars. Bob Summers, Al
> Teague,
> > > Rick & Don
> > > > Vesco, Bruce Geisler, and others are among those I can call "fast
> > > friends", (no pun
> > > > intended).
> > > > All of these mention have a quality that I consider important. They
> not
> > > only went
> > > > fast, but they designed and built the cars that carried them to those
> > > speeds. Many
> > > > have set records, gain the publicity and recognition by laying down
> the
> > > money and
> > > > having the guts to sit behind the wheel, but this is not what we are
> > > about.
> > > >
> > > > I have known Al and followed his progress since he first arrived on
> the
> > > Salt. Al
> > > > has risen to the top of the heap with almost no sponsorship, in a car
> he
> > > actually
> > > > built with his own hands, drove it repeatedly at unimaginable speeds,
> and
> > > exhibits
> > > > a humility that is enviable. To me, he is truly the hero of our
> sport.
> > > >
> > > > Tom Bryant, 216 D/CC - El Mirage, Muroc, Bonneville
> > > >
> > > >
> > > >
> >
|