Thread: 455 Olds 11:1 -> 10:1

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You know Dallas, I used to DATE a redheaded schoolteacher who kept making me do it again and again until I got it right. I think that's the course we will have to follow here. Let's continue....I have all night....

"where u got all that from i have no idea, such as lowering compression with aluminum heads."

Who said anything about that?? Where did that come from??

"becaue aluminum heads have a hgher heat dispation ratio than irons and heat contained in the combustion cycle for how long most determines static cyl pressure or static compression as u folk like to call it outside of mechanical compression ratio."

BZZZZZZZZZTTT. Wrong. Dallas, let's try to stick to the principles involved and tag them properly. You have static compression ratio, which is a purely mathematical function where you add up all the volumes drawn into the cylinder when the piston descends in the bore and then divide that figure by the total volume with the piston at TDC. That is a STATIC figure. It will not change one iota after the motor is built. It is normally referred to as SCR to prevent spelling it out. Dynamic compression ratio, on the other hand, is a constantly changing pressure. You can figure it mathematically, but your product will be only an average of the actual moving DCR. It is figured using SCR, rod length, stroke and the intake closing point of the intake lobe of the camshaft.

"It then follows that aluminum heads will yeild a diff staic cyl presure than would the same engine at the same mechanical compression ratio, one that would b LOWER."

BZZZZZZZZT. Wrong again. Come on Dallas, pay attention. Static compression ratio and mechanical compression ratio are the same thing. Both are a mathematical value and mean nothing in respect to the dynamic compression ratio that is a result of the motor running. The only way aluminum heads are going to yield a different static (or mechanical) compression ratio is if the combustion chamber is smaller or larger than the chamber in an iron head that you are comparing to.

"As for the number and types of cars i have had, i have owned in Just hot rods to name a few, now 5 2cnd gen Trans Ams, 2 442's and 5 Cutlasses powered by Olds V8 engines of all sizes, 10 GTOs, 3 catalina 2+2s, 3 Model SJ Grand Prixs, 2 DZ 302 69 Z28s 1 with the service package 5 option package the other with the service pack 6 option package. Presently i own 4 cars a motorcycle and a pic up truck, down from a total of 10 vehicles a couple years ago, including 3 motorcycles. I have also owned both Mopar and Ford hot rods, 1 RR, 1 GTX, 1 Sport Satelite among the former, a stang and a 65 390 4 gear galaxie, a number of pintos including a V8 conversion tha i built."

Personally, I don't care how many cars you have owned. That doesn't make you any smarter or able to debate any more intelligently and it certainly didn't do anything for your composition, punctuation or spelling. Furthermore, it did little or nothing in the way of convincing me that you have any idea what you're talking about.

"As for my educational and automotive experiences, that too was to make sure its understood that im speakin what I KNOW than what i thought or think. Again all in response to the disrespectful responses from other commenters about the 1st post.
AND the original post was entirely on point, as well as included comment to insure tha it was understood that i KNOW what im talkin about, not just think i do."

Dallas, you don't know how it pains me to have to tell you that you don't have a clue. I'm sure you have built motors in the past and they have performed admirably, but believe me, it wasn't because you know any of the basics of what makes a motor work. I saw a fortune-telling hen at the boardwalk once, but I don't think she knew anything about what she was doing either.