Article, High comp, power & efficiency

[addo]

Maybe we need a geeky looking icon like in the "Dummiesâ„¢" series of books that warns of a lengthy, detailed explanation...

There's times when being 40% off won't matter; it's simply a "test" to confirm the direction you're heading. Other times - obviously - the closer we get to "controlling" the situation in terms of predictability, the happier we become.

Regards, Adam.

 

[rbohm]

8) thank you addo. one day i am going to have to visit australia and buy you a beer.

 

[Anonymous]

but may not grasp certain engineering or physics concepts, or have a vague understanding, but dont quite get it.

Sounds like me!!

Later,

Doug

 

[Lazy JW]

I reckon if there is anything worse than a Know-it-all, it's a Know-it-all who really does
Joe

 

[MustangSix]

Of course you're right. Rounded off to the nearest 40% is necessary for the low IQ of the readers here.
I give up.

Panic,

Well, I missed the posts you deleted, so I don't have any idea what they said, but they must have been something you didn't want anyone to see. Just seem like you are not used to people disagreeing with you.

1. Most of us operate by "rule of thumb" with wide margins of error because in our little backyard world of mechanics, we lack the precision to do much better most of the time. Also, most of us have some preconcieved notions about how things work based on experience. Holy cow, how hard has it been to convince people in the past that electronic ignition really is better than points? Occasionally an iconoclast comes and knocks us off our pedestal and teaches us how to do something differently.

B. it's the net. It's hard to teach people complex things in short snippets in a forum environment. You have to carefully choose your words so that the concept clearly comes across. Even that fails most of the time.

III. be prepared to accept some debate if it's a difficult to understand concept. I have never fully been able to explain to some folks why a 300 cfm carb is usually adequate on a 250, but the same engine with Webers on individual runners would need a total intake capacity approaching 1000cfm or more. The idea is hard to put into words, just like this subject.

Don't give up, but please don't be insulting. Just because I don't fully understand something right away doesn't make me a dumbass.......it makes me an ignoramus, which is something altogether different. Finally, it's just a hobby......don't take it so personally.

 

[ludwig]

You want d@mb@ss go over to a j@@p forum. They have 31 topics and only ten are tech. I asked a question and the answer came back "take it to the dealer." It's a lifestyle section. Whew. Glad to be back.

 

[broncr]

I had a physics prof who used to teach "ballpark" physics . He was a brilliant man. Part of his brilliance was in realizing that not everyone was equally gifted, and, especially with students, it was necessary to round things off and concentrate on getting the concept right. Once the concept was in hand ( or direction - as Addo put it) it was easier to deal with the specifics ( like how fast & what direction).

I believe his real brilliance shown in his ability to reach across to those "less brilliant" (like me) with understanding and compassion. I went from a straight "C" student to a straight "A" student after he taught me how to "learn" ( "if you can't teach it, you haven't learned it").

I appreciate the fact that the members of this forum are a diverse group. I rely on the value of each one's particular abilities, and don't hold it against anyone for any particular weakness, although defamation is a bit trying. I don't appreciate name calling and personal insults but realize that , with diversity, sometimes you have to "take the good with the bad".

If we all knew everything, we'd have little need for a forum like this. I'm glad I don't know everything. I'd probably be to busy thinking to ever get anything done!

I don't mind being wrong. The way I look at it, what would be the value in being "right" if there was nothing "wrong" to compare it with .

As three penny put's it - "just my 2 cents worth"...

broncr

 

[Anonymous]

Did I start all this with the first post, sorry but it is fascinating to listen to you all.

"To explain broad concepts, ideas and even technical details to the average person who may only have a very vague idea of these things. And to do so with an economy of words that still makes them interesting and understandable is the art of genius"

Thank you to those who put in some effort. I didnt expect such a responce
Cheers Tim

 

[Anonymous]

I'm sorry, but

All that proves is that you didn't understand what they were saying.
For example:
10-1 CR at full stroke X 15 psi = 150
10-1 CR (rod ratio: 2-1) with intake closing @ 60 ABDC = 8.18-1 CR^1.2 X 15 psi = 192 psi gauge pressure. Error: -22%.
7-1 X 15 = 105
7-1 intake closes @ 40 = 6.45-1^1.2 X 15 = 139 psi. Error: -24%
7-1, close at 80 = 4.89-1 = 94 psi. Error: +12%
It's even more inaccurate with your method of disregarding intake closing point:
10-1 X 15 = 150
10^1.2 X 150 = 251 psi. Error: -40%.

A bit more "rounded off" than useful. In fact it doesn't work at any CR or closing point, except by complete coincidence.

isn't all that difficult. Basic multiplication with an exponent throwin in there for good measure.

In any case, I definately stand by being more 'technical.' This is the "Hardcore Tech" section. If you want a watered down version, put it in a regular section.


-=Whittey=-

 

[rmt]

Intelligence is good. So are good social skills. Day in and day out good social skills will beat intelligence on almost every level. Who hasn't seen evidence of that?

One could easily question the intelligence of anyone who spends any more time messing with cars than necessary for repairs or manufacturing new ones. There really is little point to it. In the end we're talking about the transportation of people and goods. That's all. Everything else is pretty much wasted, except that some people will be able to make a living off all the other stuff that comes after just getting down the road. They may be making a living but there is no real purpose to what they're doing. It's just that a lot of people really like it.

But as Mustangsix said "...it's just a hobby...". I used to be a professional mechanic and have a considerably better than average grasp of what's going on in an internal combustion engine. I can read the articles. I can understand and do the math. I also understand when I've been insulted. Technical section or not, that's unnecessary.

 

[SuperMag]

Of course you're right. Rounded off to the nearest 40% is necessary for the low IQ of the readers here.
I give up.

If we're so damned dumb, why are you here? Did you get thrown off of the dickheadengineers.com forums for not being saucy enough?

 

[rbohm]

I'm sorry, but Panic wrote:
All that proves is that you didn't understand what they were saying.
For example:
10-1 CR at full stroke X 15 psi = 150
10-1 CR (rod ratio: 2-1) with intake closing @ 60 ABDC = 8.18-1 CR^1.2 X 15 psi = 192 psi gauge pressure. Error: -22%.
7-1 X 15 = 105
7-1 intake closes @ 40 = 6.45-1^1.2 X 15 = 139 psi. Error: -24%
7-1, close at 80 = 4.89-1 = 94 psi. Error: +12%
It's even more inaccurate with your method of disregarding intake closing point:
10-1 X 15 = 150
10^1.2 X 150 = 251 psi. Error: -40%.

A bit more "rounded off" than useful. In fact it doesn't work at any CR or closing point, except by complete coincidence.
isn't all that difficult. Basic multiplication with an exponent throwin in there for good measure.

In any case, I definately stand by being more 'technical.' This is the "Hardcore Tech" section. If you want a watered down version, put it in a regular section.

8) for the most part i agree with you that the added math isnt that much more difficult for some of us here. but remember that most of the people who come here to learn these things are not engineers, math professors, or phyics types. they are the average person who want to understand more about how their car works, and why more of one thing is good and less of something else is also good. or why something works well in one settup, but poorly in another. even though this si the hardcore section of the board, these same people read this and try to understand the concepts. if they can understand the concept, then they have learned something, if not they get frustrated, and make other things dealing with the same broad subject more difficult than it needs to be. if i were dealing with my uncle on why higher compression works better than lower compression, i would deal with him on his level(that of the engineer), but to do the same with my aunt or mother, i need to deal with them on their level(that of the layperson). since it is easier to deal with a large audience, as we do here, as though they are lay people, simplicity is best.

 

[StrangeRanger]

If we're so damned dumb, why are you here? Did you get thrown off of the dickheadengineers.com forums for not being saucy enough?

Sacre Merde!

 

[MustangSix]

If we're so damned dumb, why are you here? Did you get thrown off of the dickheadengineers.com forums for not being saucy enough?

Enough! This forum is for hardcore technical stuff and we've deviated quite enough.