Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: gregsdart]
#2483869
04/16/18 09:45 PM
04/16/18 09:45 PM
|
Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,213
New York
|
Of course. Where do I apply to have the laws of physics, properties of metals, inertia, heat transfer, etc. suspended for my project? Because my own ideas are better...
Boffin Emeritus
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: polyspheric]
#2483960
04/16/18 11:51 PM
04/16/18 11:51 PM
|
Joined: Oct 2003
Posts: 11,686 W. Kentucky
justinp61
I Live Here
|
I Live Here
Joined: Oct 2003
Posts: 11,686
W. Kentucky
|
Of course. Where do I apply to have the laws of physics, properties of metals, inertia, heat transfer, etc. suspended for my project? Because my own ideas are better... So, what exactly are you building?
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: justinp61]
#2483963
04/16/18 11:58 PM
04/16/18 11:58 PM
|
Joined: Feb 2005
Posts: 20,203 PA.
pittsburghracer
"Little"John
|
"Little"John
Joined: Feb 2005
Posts: 20,203
PA.
|
Of course. Where do I apply to have the laws of physics, properties of metals, inertia, heat transfer, etc. suspended for my project? Because my own ideas are better... So, what exactly are you building? Man that's what I was thinking. What is it going in and are you going to "race it"
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: Al_Alguire]
#2484060
04/17/18 08:43 AM
04/17/18 08:43 AM
|
Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
pro stock
|
pro stock
Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
|
Some people cling to old theories and ways of thinking. It is one of the largest factors that to this day still holds back Mopar guys. It's hard to think outside the box when the head stuck inside the box is located deep inside an anal cavity.
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: gregsdart]
#2484161
04/17/18 12:35 PM
04/17/18 12:35 PM
|
Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,213
New York
|
"Old theory": quench, developed and patented by Harry Ricardo before WWI. But we know better now...
Boffin Emeritus
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: gregsdart]
#2488036
04/26/18 12:14 AM
04/26/18 12:14 AM
|
Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,213
New York
|
"You are beginning to sound like a first semester engineering student!" How odd - that's what people said about me... when I was 12.
Did you notice that you disagreed with something I didn't say? No?
I'd love to explain, really. But the most adamant of my critics has demonstrated his lack of comprehension of the subject, so I'll just let you all believe whatever you want. M'kay?
Boffin Emeritus
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: polyspheric]
#2488124
04/26/18 09:26 AM
04/26/18 09:26 AM
|
Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
pro stock
|
pro stock
Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
|
"You are beginning to sound like a first semester engineering student!" How odd - that's what people said about me... when I was 12.
Did you notice that you disagreed with something I didn't say? No?
I'd love to explain, really. But the most adamant of my critics has demonstrated his lack of comprehension of the subject, so I'll just let you all believe whatever you want. M'kay? I'm not trying to be a Male sexual reproductive organ here But on your http://victorylibrary.com/mopar/m-table-c.htm#SBCSome of the 6.4 hemi data is wrong, bore is 4.09 and stroke is 3.724 ,Deck is 9.28 not(B) 4.055(S) 3.795 (DH) 9.25 Thank you for posting all the information on that list it has be very helpful
Last edited by ric3xrt; 04/26/18 09:29 AM.
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: gregsdart]
#2488163
04/26/18 11:00 AM
04/26/18 11:00 AM
|
Joined: Oct 2007
Posts: 4,213 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,213
New York
|
That would make .0000000000000000000000001% of my free information, yes?
Boffin Emeritus
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: gregsdart]
#2488200
04/26/18 12:25 PM
04/26/18 12:25 PM
|
Joined: Jan 2006
Posts: 1,400 Trumbauersville PA
ric3xrt
pro stock
|
pro stock
Joined: Jan 2006
Posts: 1,400
Trumbauersville PA
|
I apologize if it comes off as I'm attacking, that's not my intent.
Truth has no agenda, but those with an agenda make their own truth. Some of us are so open minded they only see their View
|
|
|
Re: Gen III AL block, big power gain! Ma Mopar paying racers!
[Re: ric3xrt]
#2488252
04/26/18 01:52 PM
04/26/18 01:52 PM
|
Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,376
|
In this writeup I am comparing aluminum with gray cast iron, common material of engine blocks.
Getting back to science, the problem comes from the relative spring rates (moduli of elasticity) of the metals involved. In relative terms, aluminum is a 10, gray cast iron is a 20, and nodular iron and compacted graphite iron are 30. So it is easy to see that using aluminum would give some problems with stiffness.
HOWEVER, another factor jumps in here and that is how stress applies to bending. We call it different things, but flexing or bending is a way that power is lost in an engine block. Stress is what produces strain, or motion. Stress in a beam in bending is proportional to the moment (bending force) and proportional to the distance from the neutral axis. It is inversely proportional to the moment of inertia. Moment of inertia almost always involves a dimension to the fourth power. So if, for example, you have a main bearing web 1" thick, and you increase it to 2" thick. the distance from the neutral axis increases by factor of two, while moment of inertia increases by factor of 16, 2 to the 4th power (2x2x2x2). You have a 2 in the numerator and 4 2s in the denominator so the increase in resistance to bending is actually increased by a factor of 8, 2 to the 3rd power, or 2x2x2.
If you followed me this far and think it through, it means that to increase the thickness of a beam to compensate for the aluminum extra springiness, you don't have to increase the dimension by 2, you have to increase it by factor of cube root of 2, which is 1.26. So your 1" thick main bearing bulkhead is now 1.26" thick and equally as stiff, and if you want to make it stiffer it doesn't have to be much thicker. Another 0.24" and it is now 1.69 times as stiff as the 1" cast iron.
This only applies in bending, not in straight tensile or compressive stresses. But bending or flexing adds friction and reduces ring seal so it is more important.
R.
|
|
|
|
|