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Old 03-02-2001, 05:45 PM   #1
Adam
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Question

what is a compression ratio, bhp / liter, bore, stroke, lateral acceleration, EPA stand for, a sequential transmission, Final Drive, and what EXACTLY is displacement?
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Old 03-02-2001, 09:22 PM   #2
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Bore is how wide the piston chamber is, stroke is how deep it is. EPA=Enviromental Protection Agency.
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Old 03-03-2001, 07:11 AM   #3
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bhp / liter = power(bhp) divided bz its displacement (in liter);

displacement = An engine's total volume available for the charge, including both the swept volume (total range of piston movement) and the clearance volume (from the combustion chambers). During the 1960s displacement was usually expressed in cubic inches, often abbreviated as "CID";

lateral acceleration = This is a physical one. If an object wants to make a curve it needs a acceleration/force orthogonal to its direction. this force aims to the center of the circle the curve describes. e.g. the E36 M3 has a max. lateral acceleration of about 1g, means that you can't exceed this limit else your car will brake out and you'll lose control over it. for better explanation check a physics book and look for rotational movement;

Compression ratio = (often shortened to "C/R") A measure of the pressure produced inside a combustion chamber when the piston is at maximum travel toward the cylinder head. This ratio is derived by showing the compression factor of the charge vs the constant ("1") of normal atmospheric pressure at sea level. For example, a typical 1960's "C/R" number would be shown as "9.5:1". Please note that our C/R statements often include the phrase "with service type gaskets". That's because the "factory" gaskets were significantly thicker than those sold by Ford dealers. Using these "service" gaskets commonly raises compression by up to half a point;

sequential transmission = it's kind a half automatic zou don't have to do the clutching anymore. e.g. the Ferrari 355 Challenge has one;

for the final drive my english vocabulary is lacking sorry
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Old 03-04-2001, 03:17 AM   #4
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final drive is basically the gearing at the diff, right?
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Old 03-05-2001, 06:52 AM   #5
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Thumbs up

Right!
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Old 03-05-2001, 04:09 PM   #6
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thanx
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Old 03-12-2001, 10:15 PM   #7
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Bean BAndit, your wrong. The compression ratio is the ratio as to how much smaller the compression area is then the whole stroke of that cylinder.
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Old 03-13-2001, 05:14 AM   #8
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To Psman32 I didn't wrote it, I copy pasted it from FoMoCo and I don't think they made a mistake. Besides your explanation seems right but very simple!
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Old 03-16-2001, 02:20 AM   #9
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BHP=Brake Horse Power. They used to measure HP with a mechanical brake type thing that put pressure on the crank end, to usually measure the torque then calcuate the HP. How ever much force it could withstand then that was its BTQ (Brake Torque)
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Old 03-16-2001, 10:24 PM   #10
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To add to the line of Questioning, why do they call Helicopter and boat engines' ouput "Shaft Horsepower" or shp?
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Old 03-18-2001, 09:06 PM   #11
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Arrow Bean Bandit, Psman32

What you two are talking about is the static compression ratio. A little more complicated is the dynamic compression ratio. I don't have a firm grasp of the differences between these two principles myself yet, but I should hopefully read up on it this week, and then add an updated post explaining the difference. And it is indeed a very important difference from an engineering standpoint with regards to high performance engines.
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Old 03-19-2001, 06:37 AM   #12
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I'll read it up too thanks for clearing up!:bandit:
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Old 03-19-2001, 05:08 PM   #13
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i just saw that bhp was base horspower
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Old 03-19-2001, 09:00 PM   #14
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BHP is Brake Horsepower. I am reading a Automotive Engineering text book like thing for fun, (I'm 15, not old enough to be in College yet), They explain it all, it means Brake Horsepower.

SHP, Shaft HorsePower. There measure how much HP is at the end of the Propeller shaft.

FYI: 1 hp = about 750 watts.
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Old 03-20-2001, 06:06 PM   #15
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How do they measure it then? I'm assuming it's not a a Dynometer.
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