For your information. James
From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
On Behalf Of Bob Jasinski
Sent: Friday, January 12, 2024 9:35 AM
To: 'ridgleyracing65' <ridgleyracing65@xxxxxxxxx>; 'Chrysler 300 Club International' <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: Re[2]: {Chrysler 300} 300F Engine Dyno Results
Dyke,
Thanks for the overview of dyno testing. Very enlightening, it’s a much more complex procedure than I realized.
Bob J
I have dynoed countless engines over the last 40 years. We routinely run every rebuild on the dyno. I can tell you this: absolute numbers mean very little. Every dyno will produce different numbers depending upon how it is calibrated and
who is operating it. I have told my clients for years, if they tell me how much power they want, I will get them dyno sheets that show that amount of power. Dynos can be manipulated by how the correction factor is input by the operator. The correction factor
is made up of ambient temp, dyno room temp, specific gravity of the fuel, barometric pressure at the very time of the pull, etc. By altering these numbers, a good dyno operator can make an engine produce about anything he desires. As for us, our operator always
sets up the dyno very conservatively, so we are pretty sure the engine makes at least as much power as the dyno sheets show. In the 1950-70 time frame, factory dyno tests were done using the "gross" method, as mentioned earlier. However this process also included
optimizing the "tune" for each rpm level during the pull. In other words, the jetting and ignition timing were changed to give max torque numbers (dynos only measure torque) at each rpm step. The final jetting and advance curve when the engines were installed
on the assembly line was not the same as the best settings on the dyno.
Dyno's are only good for A/B testing. Run the motor and make a change and run it again. The dyno will tell you if the engine liked the change or not and by how much it was better or worse. To intelligently comment on the gentleman's engine,
I would need to see a complete dyno chart for a pull. What were the inputs to the "correction factor", what did the oxygen sensors for the cylinders show or what were the Brake Specifics during the pull to determine it the motor was running lean or rich. Maybe
his motor was too lean, and had high exhaust gas temps or too much fuel was causing the brake specifics to be too low. Did they make a number of pulls to try different timing numbers? On the surface, it would seem the torque number is about right, but then
the bhp seems low to match the torque, but again, nowhere near enough data is available to make any conclusions. The gentleman needs to get a lot more data from the testing before any real analysis can be done.
On Thursday, January 11, 2024 at 5:41:24 PM UTC-6 Carl Bilter wrote:
While not my area of expertise, I believe that Ray is correct. Dyno would measure at the flywheel, correct?, but in order to get net hp, the full exhaust system and all engine accessories need to be installed. Based on the torque number
listed (matches advertised gross output), it would appear to be a gross hp measurement. If truly stock and correctly rebuilt, it should be much higher than 316hp gross hp. Many factors involved, including the cam - and if it has the special 4 degree retard
built in or, if not, the special three key way crank gear used and set up correctly. That is critical.
As far as I know we do not have documentation from Chrysler on the true output of the standard F and G engines. But we do have the document related to the J engine which Chrysler dyno'd in Aug. 1962 - I think it might be on the club website
somewhere. We know for a fact that the J (and Ram K which was the same) made at LEAST 25 more hp than F/G - and that was straight from the expert - the late Burt Bouwkamp. It made more power due to short rams, solid cam, and headers. Chrysler tested the
true NET hp of the J engine (with full stock exhaust system) and it peaked at about 315 to 320hp. That means gross hp would have been at LEAST the advertised 390hp and maybe more. BTW, consider how remarkable that was in 1963-63 - not counting the max wedge
and 426 hemi - it was wasn't until the 6 pack 440 came out that you had a 440 that made 390hp!
Therefore, it is likely that the F and G standard 413 actually produced as much as 365 GROSS hp, and perhaps much more (375 certainly possible).
------ Original Message ------
Date 1/11/2024 4:14:51 PM
Subject Re: {Chrysler 300} 300F Engine Dyno Results
What factors do they address to get from old gross numbers to today's net numbers? I seem to recall that the old gross numbers were obtained without running ancillaries like a generator/alternator, power steering pump, A/C, etc., but what else? I believe
from his wording that Mr Grossi sent just the engine itself to the dyno, so there should be no drivechain losses. And it looks like only the horsepower number was significantly different than the old measurement, but the torque number was close to the same.
That doesn't make sense to me - (YET)! I don't know if the peak torque and HP numbers occurred at about the same RPM as original, but assuming that they are, how else can that difference be explained?
Ray Melton 300C cvt in Las Cruces, NM
****************************************
On 1/11/2024 2:43 PM, dplotkin wrote:
The original ratings were gross. Today's ratings are net.
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
Date: 1/11/24 12:53 PM (GMT-05:00)
Subject: {Chrysler 300} 300F Engine Dyno Results
Hello Group,
The rebuild on my 300F engine has been completed and the engine rebuilder sent it to the dyno for break-in, running condition and leak detection.
The engine is stock, stock carburetors and ram intake manifold, stock bore (it was sleeved because of pitting on a couple of the cylinder walls), as stock a cam as you can get, same crankshaft and pistons. The engine was rebuilt by someone else in 1995 before
I owned the car. The engine was bored .004 at that time.
My rebuilder wanted to share the results with our group to see if anyone else had similar experiences:
Maximum engine torque - 2,900 rpm- 496 ft. lbs.
Maximum horsepower - 4,600 rpm - 316 hp
The horsepower is about 16% lower than factory specifications of 375hp.
Has anybody else had this differential in hp from factory? Is this normal?
Thank you,
Fred Grossi
Pegram, TN
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