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Re: Engine Simulation & Cams

To: Kas Kastner <kaskas@earthlink.net>
Subject: Re: Engine Simulation & Cams
From: Ted Schumacher <tedtsimx@q1.net>
Date: Tue, 01 Jan 2002 16:08:37 -0500
happy new year to the list.  in keeping with this thread, here is an accurate,
real live, dyno method.  accurate within 5%  runthe car on a dragstrip or a true
1/4 mile.  formula is HP= (mph divided by 234)3 divided by the weight of the
car.  mph is 1/4 mile speed.  ted

Kas Kastner wrote:

> You've got the picture.  More cam, more compression.  The 300+ cams work
> well though from 4000 to 6500 or a little more in these old time engines and
> generally it is the cylinder head breathing and combustion shape that stalls
> out the power much over that number.
> ----- Original Message -----
> From: "Larry Young" <cartravel@pobox.com>
> To: <fot@autox.team.net>
> Sent: Sunday, December 30, 2001 7:39 AM
> Subject: Engine Simulation & Cams
>
> > As a new member, I've been spending a lot of time going through the
> > archives, but it's a slow process. A few questions:
> >
> > Has anyone run an engine simulator on TR3/4 engines?  It seems like a
> > good way to dial in cams, compression, etc.  It is a fast and cheap way
> > to experiment, and an excellent tool when used in conjunction with a
> > dynamometer.  I played around some with Engine Analyzer.  I could get
> > close, but really need some flow bench data to do the job right.  Has
> > anyone published flow data for these engines?  I'd like to use the
> > simulator to look a cams.  I have a gut feeling that about 90% of
> > modified engines are overcammed (too much duration).  My TR3A (ex Jeff
> > Wilt/Bob Kramer) has about 10.5:1 compression and a 304 degree duration
> > cam.  I saw Greg Solow's post which recommends cams based on compression
> > ratio.  Usually the cam duration is tied to the RPM range where you want
> > power.  From what I read, these crankshafts tend to let go with
> > sustained operation around 6500 RPM.  So why would you ever want to run
> > a 300 degree cam which produces power at 4000 to 8000 RPM, when you
> > could run a 290 degree cam which produces power at 3000 to 7000 or even
> > a 280 degree cam that produces power at 2500 to 6500?
> > Larry Young

--
Ted Schumacher
TS Imported Automotive
404 Basinger Rd.
Pandora, Ohio, USA 45877
Ph. 800/543-6648  USA/Canada  FAX 419/384-3272 24 hour
Ph. 419/384-3022 - tech./general information
Web page http://www.tsimportedautomotive.com
New-Used-Rebuilt-NOS-Performance British car parts.
200 - 300 parts cars in our British-only salvage yard.

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