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05-20-2024, 09:23 AM | #1 |
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"New Engine" Balancing"
The "New Engine" is manufactured in factories that produce engines for current Japanese, European, and Domestic automobile and truck production.
The "New Engine" parts are balanced to the same tolerances as other parts made in these factories and the balance is adequate for most applications. We are aware that balance can be better for unique applications beyond normal driving within speed limits on paved roads. We have a problem with "Builders" that claim the "New Engine" parts are not balanced and use balancing as a line item on a build sheet to increase their profit. One "Builder" sent the following correspondence to a potential buyer "The engine is not balanced unless you had it balanced. This is a common misconception as the flywheel crankshaft, pressure plate and rods and pistons all have to be balanced together for best results." The crankshaft, connecting rods, and flywheel of the "New Engine" are balanced separately to the same tolerances as a modern engine. Any set of connecting rods combined with any crankshaft combined with any flywheel will be in balance to modern engine tolerances. Balancing everything as one assembly and match marking parts is a bad idea because if 1 part is changed, the entire assembly must be rebalanced. "Buyers" need to be aware of false claims made by "Builders" and report false claims to me at [email protected]. Please do not subject yourself to criticism by reporting anything on public forums. The cost to assemble an engine is increasing due to inflation and we get upset when a "Builder" claims the increased costs are because the "New Engine" parts are not balanced. Last edited by Terry Burtz, Calif; 05-20-2024 at 12:43 PM. |
05-20-2024, 10:17 AM | #2 |
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Re: "New Engine" Balancing"
What are the “ modern engine “tolerances for balance and how do they compare to the original Ford balancing tolerance ?
If you don’t publish the actual specifications how can the builder be able to know if it is out of specifications? |
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05-20-2024, 10:34 AM | #3 |
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Re: "New Engine" Balancing"
Kurt
The subject of “balancing” the engine is another misunderstood science I would suggest doing a little research on the ISO balancing standards Once you determine the actual operating speed and rotating mass you will understand the original Ford specifications might have been a little optimistic As a once well known balancing guru said “any balancing done beyond ISO specs is just pure entertainment” John
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05-20-2024, 11:27 AM | #4 |
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Re: "New Engine" Balancing"
Thanks, John Neilson,
There is a normal car (Grocery Getter) balance, Circle track balance, Formula 1 balance, turbine balance, and Gyroscope balance for rotors that spin at 48,000 RPM. Any of these are suitable for a Model A Ford. |
05-20-2024, 11:30 AM | #5 |
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Re: "New Engine" Balancing"
Balancing a 4 cyl. engine does not have to be done as a unit, the crank, rods, flywheel, etc. can al be done separately.
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05-20-2024, 11:42 AM | #6 |
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Re: "New Engine" Balancing"
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The counter weights are a compromise between the two. The Burtz design has two counter weights for each piston, 8 in total. Previous designs of counter weighted cranks for the A and B engines had only counter weights at 4 locations. Stock A cranks had none. The engine in my completely stock 1930 Model A that I drove in high school would vibrate like crazy at 55 mph. My Burtz engine does not feel like it is coming apart at this speed or higher like my stock A did.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 05-20-2024 at 11:56 AM. |
05-20-2024, 12:29 PM | #7 |
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Re: "New Engine" Balancing"
To add one more point
The inline 4 cylinder engine suffers from the fact that the offset piston acceleration between top and bottom of stroke causes harmonics that cannot be dampened without adding a counter shaft that is selectively unbalanced Reducing piston/pin and small end rod weights helps with the harmonics John
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05-20-2024, 01:52 PM | #8 |
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Re: "New Engine" Balancing"
"As a once well known balancing guru said “any balancing done beyond ISO specs is just pure entertainment” ".
yea, but its still fun to see how close you can get things past the spec! When you start chasing the unbalance, that's when you know to stop and move on. |
05-20-2024, 06:28 PM | #9 |
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Re: "New Engine" Balancing"
I thought being "unbalanced" was a requirement for taking part in this hobby.
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05-20-2024, 06:46 PM | #10 |
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Re: "New Engine" Balancing"
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05-21-2024, 03:34 PM | #11 |
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Re: "New Engine" Balancing"
I tell people that every person in the Model A hobby is eccentric, except me. They always laugh.
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05-21-2024, 04:26 PM | #12 | |
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Re: "New Engine" Balancing"
Quote:
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05-21-2024, 07:32 PM | #13 |
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Re: "New Engine" Balancing"
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