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Old 05-05-2019, 07:11 PM
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Basic Hot Rodding terminology and it's true meaning

I realize this has been probably been asked multiple times before, so I apologize ahead of time!

As a long time "armchair" admirer of muscle cars, I've never entirely understood what some of the terminology has meant. I came to this realization when I listened to the Beach Boys sing "ported and relieved, stroked and bored...."
In addition I was watching a video on YouTube to try and gain an understanding of what is done when something is "bored over .030"
So, .030 of an inch is removed from the cylinder heads, why does this increase the displacement? i thought displacement was the overall size of the engine, from inside out? Why does this increase power? Why not just have the cylinders maxed out at the factory if it's such a big deal?

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Old 05-05-2019, 09:17 PM
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You've still got some things very confused.

Boring an engine .030" oversize means removing .030" from the cylinder wall surface, making each cylinder bigger in diameter and thus making the engine have more cubic inches.

Completely different from milling or "decking" a cylinder head .030", which is cutting off that much thickness from the gasket face of the head where it is bolted to the block. This has the effect of making the combustion chamber smaller, which means all the air and fuel put into the motor is now squeezed into a smaller space raising the compression ratio. It does not increase displacement, just increases compression ratio to gain more power.

The factory does not want to build engines on the bleeding edge of max power because it leads to reduced durability and warrantee work/recalls....which eats into profit.
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Old 05-05-2019, 10:23 PM
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You don't max out the cylinder bore because you need to leave room for future repair. You generally bore a cylinder oversize .030 to make it straight again after 200,000 miles of wear. Not just to make more power. The increased power comes from the increased ring seal.

Stroking an engine is done for increased displacement, and more power. It makes the piston go farther up and down. It is more involved than just installing a stroker crank. More stroke by itself would make the pistons hit the head if not compensated by installing shorter rods or reducing piston crown heights.

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Old 05-05-2019, 10:35 PM
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Quote:
Originally Posted by ericnova72 View Post
Boring an engine .030" oversize means removing .030" from the cylinder wall surface, making each cylinder bigger in diameter and thus making the engine have more cubic inches.
Actually it means removing 0.015" from the cylinder wall, on the radius of the cylinder,which, on the diameter of the cylinder, equates to 0.030" larger. There is a limit to how large you can bore a cylinder and it varies from motor to motor and manufacturer to manufacturer. Most people think a piston slides smoothly up and down the cylinder. It does not. It moves along with a "skidding" motion, so that the piston rings make little jerking movements up and down. If the cylinder walls get too thin from over-boring them, then there is insufficient metal left in the cylinder walls to quell the vibrations that are set up by the rings skidding up and down the cylinder walls. The vibrations are then transferred to the other side of the wall, where the cooling water is located. The vibrations separate the cooling water into water and air, which forms little air bubbles that then cling to the cylinder walls on the water jacket side of the cylinder. These little air bubbles prevent cooling water from getting to the metal of the cylinder to cool the cylinder and suddenly you have a motor that will always run hot and cannot be cooled. It is junk. Famed racing genius Smokey Yunick discovered this "air bubble" phenomenon by cutting away part of a cylinder block, installing a glass window and running the motor to actually observe what was taking place in the motor as it ran.

After boring the cylinder, the finish is unsuitable for running the piston rings on, so the machinist will use a hone that is actually a stone surface, to run up and down in the cylinders to make scratches that will hold engine oil and help to lubricate the piston rings. A cylinder will be final-honed with a specific coarseness of stone that will be compatible with the material that the piston rings are made of.

Ported and relieved refers to hot rod methods that were used on the Ford and Mercury flathead motors, mostly v8's made from 1932 to 1953, with a few Cadillac flatheads up through 1948. Porting is going into the intake ports with a grinder to enlarge and re-direct the ports so that they will transfer more air and fuel into the cylinder. Exhaust on the Fords and Mercurys went out through passages on the inside of the block. This contributed to them overheating if the cooling system was not up to par. Here are some photos of a flathead block showing relieving (cutting the block deeper so that there will hopefully be more flow, making more horsepower). The fellow who posted this did not know that the area relieved was the exhaust valve, not the intake.
https://www.jalopyjournal.com/forum/...relief.707640/

The other exercise you mentioned is stroking. This is lengthening the stroke of the crankshaft, either by welding up the rod journals and grinding them off center with a longer stroke, or by purchasing a new crankshaft that has been manufactured with a longer offset and thus has a longer stroke.

This is just a smidgeon of knowledge off the top of my head, but I am happy to share with you. You may want to go to a bookstore or on Amazon and buy a book that is concerned with hot rodding. Here is a good one to start with, to get the basics arranged in your mind......
https://www.amazon.com/s?k=how+to+re...f=nb_sb_noss_2
.
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Old 05-06-2019, 04:32 AM
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The one non-mechanical song term that seems to confuse some folks (not sure why) is the statement that "I got the pink slip, Daddy." In that time period in California the pink slip was the title to the car. Its not clear whether it just means he owns the car free and clear, or that he won the car in a race (a race for pinks), but he has the title. Since most hot-rodders are cash poor, that is usually significant.

Bruce
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Old 05-06-2019, 04:47 AM
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I find Sammy Hagar easier to interpret.....
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Old 05-06-2019, 07:40 AM
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Quote:
Originally Posted by 75gmck25 View Post
"I got the pink slip, Daddy."
Reference is to "Racing for Pinks", pink was the title to the car, and winner got the other car. To have the "Pink Slip" meant he didn't lose.
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Old 05-06-2019, 09:12 AM
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Tech and 75gmck25 nailed it shut.

Bogie
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