What we do in the Harley industry, where 20% of my customers have dynos, is
to make one or two baseline runs, then make one change at a time , after
that. Obviously jetting and timing being the two most frequent.
Dale "Chief" Thomas.
O.F.O.S racing
P.S. The accuracy of the equipment is not as important as you think. Since
you are using it for comparative measurements, showing improvements
(hopefully) over your base runs.
-----Original Message-----
From: Keith Turk <kturk@ala.net>
To: Lawrence E. & Cathy R. Mayfield <lemay@hiwaay.net>; V4GR@aol.com
<V4GR@aol.com>; land-speed@autox.team.net <land-speed@autox.team.net>
Date: Wednesday, April 26, 2000 8:21 AM
Subject: Re: Dyno Questions
>Figures you would think like a Dang Rocket Scientist.... But I agree
Mayf...
>you wouldn't get some of this on a Dyno especially a chassis Dyno with all
>of the Car Variables thrown in... and I don't have Ten motors to Pitch at
>one of these things... One of the biggest underlying considerations is
that
>the fella's that own this thing JUST got it and have about as much
>experience as I do on one... in other words Zip.... but they have the
device
>and are willing to Play with my Junk....
>
>The question is really what would be the Most effective use of How Many
>Pulls... in other words since we don't have ten motors... what Information
>could we Gain from say 3 Pulls... 5 Pulls .... 7 Pulls and what are the
most
>Critical things to learn... Brad and I have been talking about what
>information we would like to have and what we could get out of using the
>Dyno.... When you run the car on a Track the Variables are even Larger so
>the Dyno Makes sense for some of the little questions in life .... like Cam
>Timing and Ignition Timing... or do you bother with that? or do you Just
>come up with the notes from Guys who have done this a Million times and
>accept the fact that at 7200 Rpm a Small Block Chevrolet likes 36 degrees
of
>Timing Best?
>
>Interesting thoughts.... Keith
>----- Original Message -----
>From: Lawrence E. & Cathy R. Mayfield <lemay@hiwaay.net>
>To: <V4GR@aol.com>; <kturk@ala.net>; <land-speed@autox.team.net>
>Sent: Tuesday, April 25, 2000 5:28 PM
>Subject: Re: Dyno Questions
>
>
>> I am curious also. But is it measureable? Most instrumentations systems
>> have a certain resolution and accuracy. I suspect that dynos are sort of
>> calibrated at the factory then never checked again. I would bet a dime to
>a
>> donut that two consective runs of exactly the same configuration does not
>> give exactly the same results! Too many factorys to consider. Would have
>to
>> do a multi variate analysis on many runs to come up wit the answer, me
>> thinks. But anyway I sure would like to see the data.
>>
>> mayf
>>
>> At 05:43 PM 4/25/00 EDT, V4GR@aol.com wrote:
>> >I'll give it a shot, but I don't really expect much with these new
killer
>> >ignitions. With a .045 gap and long flame I expect your lighting the
fire
>> >either way. We'll see. Rich
>> >
>> >
>>
>>
>>
>> L.E. Mayfield
>> 124 Maximillion Drive
>> Madison, Al. 35758-8171
>> ph: 1-256-837-1051
>>
>> http://home.hiwaay.net/~lemay
>>
>> lemay@hiwaay.net
>>
>> Sunbeam Tiger, B9471136
>> Sunbeam Alpine Bonneville Land Speed Racer,
>> '66 Hydroplane Drag Boat (390 FE)
>>
>
>
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