uh huh,
i've skimmed through a book tonight called "the design and tuning of competition engines" just to see, and another on airplane engine book just for the heak of it to see if i am completely outta line.

anywho, about the vette engine not being designed properly, and thats why its so easy to modify...and what about the 928 engine with 225 HP when it first came out, as compared to the mustang v-8s with the same displacement that had the same HP.
928 was designed by god. god.
porsche is the god of cars, now you tell me why it has the same HP as a rustang LOL.
Don't get me wrong, though, I am not saying that the american engines are designed by rocket scientests, but i think i've come to a point where I can't argue any more, I am wrong you are right, and I am not posting here anymore.

(i use matches instead of spark plugs, spark plugs are expensive, the spark doesn't matter, it's the fuel that catches on fire later that does everything, like you say...)

The earliest versions of the 928 sufferred in the US because they were just learning how to put emmission controls on cars, this was new to them. If you compare the US V8 engines at the time, they were only about 140-160 hp in the late 70's when the 928 came out. The Euro version was much faster. They got better at dealing with US emissions and the engine evolved to over 350 hp by 1991.

I think that the earlier 928's had 4.5 liter engines, it was only quite a bit later that they were enlarged to 5 liters. Also, if your are referring to the early 5 liter Mustangs, I don't think that they produced 225 hp... it was only later that these engines produced this hp. I was glancing through a Mustang book a few weeks ago, and the hp from some of these early 5 liter models was something like 185 hp.

Also, the other poster is right, the 225 hp for the 928 was the EPA stateside version. This was at the time when all auto makers were struggling with the (then) new EPA regulations... that changed year by year.

-MAS

[This message has been edited by MAS (edited 08-14-2001).]

Before the emissions regulations crunch most 5.7 and 5.0 engines where running in the upper to mid 300 hp range. Then the EPA came down on them and they all dropped down to a pathetic 170, 180. Or course another major influence in small block evolution that people tended to ignore was the insurance agency's. 300hp cars where getting very expensive to ensure. So chevy detuned there cars. Gave them a posted rate of 180hp. Much easier for the insurance company's to swallow. Now if some home mechanic tunned the car back up to 300-400 hp. thats not Chevy's fault. The artificially poor output of the small block in the late 70's and 80's was partly intentional, and partly due to trying to bring the engines into compliance with emision regulations.

cold air = more hp. Period.

Cold air is denser, denser air has more oxygin, your cars mass airflow sensor can detect this and then supplies more fuel. More fuel + more air in the cylinder = more power.

An important thing to note is that turbo charged engines are absolutly horrible when it comes to complete combution in the cylinder. they run at about 60-70% combution, if that good. But there burning so much fuel that it doesnt matter.

Remeber the golden rule of power:


Theres no replacement for displacement

------------------
If you drive it, Race it
Dave
'87 944

the 300+ hp engines were not turned into 180-hp weaklings due to emissions. emissions did rob cars of hp, but the fact is that, due to the fuel shortages & price hikes in the mid to late 70's, car manufacturers were producing smaller, more efficient engines due to public demand. where a '70 mustang would use a 275 hp v8 powerplant, the late 70's mustang would employ a relatively impotent 160 hp-ish v6.

i am a child of the 70's. bell bottoms are groovy, man!

http://home.pacbell.net/nirky/turbo_120.jpg