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Re: What's up with 512" combo's?
[Re: Brian Hafliger]
#1018015
06/21/11 10:33 PM
06/21/11 10:33 PM
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Joined: Jan 2003
Posts: 19,395
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,395
Las Vegas
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All I have ever had were low deck motors. Except for the Hemi which was a 572" and IMO was an underachiever for sure. Even when we built a replacement for it it was a slug. I have been impressed enough with them over the years that I tend to stick with them. But now that I am at elevation I am thinking of going BIG...
IMO keeping the bobweight down is a key to me. I have had 6 of these things and we haveALWAYS tried to keep the bobweight as low as possible. Current engine is the same way, although it has a bigger for at 4.501 with less stroke than a 511".
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: What's up with 512" combo's?
[Re: Brian Hafliger]
#1018016
06/21/11 10:50 PM
06/21/11 10:50 PM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
OP
master
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OP
master
Joined: Feb 2003
Posts: 3,456
Out West
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Quote:
Quote:
I am consistantly impressed with the power that I see some of these low deck strokers making. What is the secret that makes these things so good cid to hp output? Do they work better in lighter cars? Just want some input since these intrigue me. 
Better MOI due to lightweight pistons. Less piston weight, less crank weight, better moment of inertia.
Brian
This was my thought also....all in the rotating assembly. Must be good rod ratio also. They seem to rev great.
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Re: What's up with 512" combo's?
[Re: Chris'sBarracuda]
#1018020
06/21/11 11:12 PM
06/21/11 11:12 PM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
OP
master
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OP
master
Joined: Feb 2003
Posts: 3,456
Out West
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Quote:
4.380 bore x 4.250 stroke, 6.535 or 6.635 rod.. 
9.98 deck..
Chris.. 
So there is a good reason that KB makes their block available in 9.98 deck? 
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Re: What's up with 512" combo's?
[Re: Streetwize]
#1018023
06/22/11 09:23 AM
06/22/11 09:23 AM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
OP
master
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OP
master
Joined: Feb 2003
Posts: 3,456
Out West
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Quote:
Typically a low deck will have about 200G lower bobweight. Everything is shorter and lighter and the energy is concentrated closer to the crank centerline.
All else being equal the center of gravity is lower in the chassis as well. Even the little things add up like the smaller bearing surfaces which reduce friction, plus the pushrods wind up being .75" shorter so thats 12" less (almost 2 pushrods worth of) mass.
Those are all great points. Who on here prefer the low deck over an RB?
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Re: What's up with 512" combo's?
[Re: gregsdart]
#1018025
06/22/11 09:53 AM
06/22/11 09:53 AM
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Joined: Feb 2004
Posts: 3,441
Mo.
supercomp
master
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master
Joined: Feb 2004
Posts: 3,441
Mo.
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Re: What's up with 512" combo's?
[Re: Streetwize]
#1018026
06/22/11 09:59 AM
06/22/11 09:59 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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How big can you go with a low deck? After market block and all the good stuff?
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: What's up with 512" combo's?
[Re: 1967dartgt]
#1018027
06/22/11 10:33 AM
06/22/11 10:33 AM
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Joined: Jan 2007
Posts: 728
mi usa
old yeller
super stock
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super stock
Joined: Jan 2007
Posts: 728
mi usa
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Quote:
How big can you go with a low deck? After market block and all the good stuff?
572ci
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Re: What's up with 512" combo's?
[Re: old yeller]
#1018028
06/22/11 10:50 AM
06/22/11 10:50 AM
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Joined: Feb 2003
Posts: 3,456
Out West
408strokerdart
OP
master
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OP
master
Joined: Feb 2003
Posts: 3,456
Out West
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Quote:
Quote:
How big can you go with a low deck? After market block and all the good stuff?
572ci
Wow! I would have guessed 540". At 572ci, that is still a 4.5" stroke right? Seems that would take alot of clearancing to work. I still think 4.5" bore is the most using an aftermarket block.
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Re: What's up with 512" combo's?
[Re: 383man]
#1018031
06/22/11 11:05 AM
06/22/11 11:05 AM
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Joined: Nov 2003
Posts: 5,160
Texas
dannysbee
master
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master
Joined: Nov 2003
Posts: 5,160
Texas
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Ron you can use the low block with a raised block intake if you use B1 or Stage 6 heads.
Getting old just means you were smarter than some and luckier than others.
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