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What's up with 512" combo's? #1018013
06/21/11 10:24 PM
06/21/11 10:24 PM
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Out West
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408strokerdart Offline OP
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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.

Re: What's up with 512" combo's? [Re: 408strokerdart] #1018014
06/21/11 10:30 PM
06/21/11 10:30 PM
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SoCal
Brian Hafliger Offline
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Brian Hafliger  Offline
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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


Brian Hafliger
Re: What's up with 512" combo's? [Re: Brian Hafliger] #1018015
06/21/11 10:33 PM
06/21/11 10:33 PM
Joined: Jan 2003
Posts: 19,384
Las Vegas
Al_Alguire Offline
I Live Here
Al_Alguire  Offline
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Las Vegas
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"
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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Out West
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408strokerdart Offline OP
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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.

Re: What's up with 512" combo's? [Re: 408strokerdart] #1018017
06/21/11 10:51 PM
06/21/11 10:51 PM
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Arizona
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Chris'sBarracuda Offline
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Years ago Gecker sold me on low decks..

I love them.. They rev like BIG small block chevys..


Chris..

Re: What's up with 512" combo's? [Re: Chris'sBarracuda] #1018018
06/21/11 10:55 PM
06/21/11 10:55 PM
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Out West
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408strokerdart Offline OP
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What is the typical bore/stroke/deck height/rod length for a 512"?

Re: What's up with 512" combo's? [Re: 408strokerdart] #1018019
06/21/11 11:01 PM
06/21/11 11:01 PM
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Arizona
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Chris'sBarracuda Offline
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4.380 bore x 4.250 stroke, 6.535 or 6.635 rod..

9.98 deck..


Chris..

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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Out West
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408strokerdart Offline OP
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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?

Re: What's up with 512" combo's? [Re: 408strokerdart] #1018021
06/21/11 11:59 PM
06/21/11 11:59 PM
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Posts: 9,892
Weddington, N.C.
Streetwize Offline
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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.


WIZE

World's Quickest Diahatsu Rocky (??) 414" Stroker Small block Mopar Powered. 10.84 @ 123...and gettin' quicker!

https://www.youtube.com/watch?v=-mWzLma3YGI

In Car:

https://www.youtube.com/watch?v=PjXcf95e6v0
Re: What's up with 512" combo's? [Re: Streetwize] #1018022
06/22/11 12:37 AM
06/22/11 12:37 AM
Joined: Jul 2010
Posts: 2,422
Pittsburgh PA
Eric Offline
top fuel
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Pittsburgh PA
Love my lowdeck 512"....


5.53 @ 125 1/8th on the launch control..more left in her!

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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Out West
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408strokerdart Offline OP
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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?

Re: What's up with 512" combo's? [Re: 408strokerdart] #1018024
06/22/11 09:25 AM
06/22/11 09:25 AM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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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Mo.
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supercomp Offline
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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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Hilltown Pa
1967dartgt Offline
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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
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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mi usa
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old yeller Offline
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Quote:

How big can you go with a low deck? After market block and all the good stuff?


572ci

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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Out West
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408strokerdart Offline OP
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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.

Re: What's up with 512" combo's? [Re: 408strokerdart] #1018029
06/22/11 10:55 AM
06/22/11 10:55 AM
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Balt. Md
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383man Offline
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The only bummer with the low deck is you dont have a crossram that fits it so thats why I went with the RB block as I hope to put the crossram on my 63 one day. Ron

Re: What's up with 512" combo's? [Re: 383man] #1018030
06/22/11 11:03 AM
06/22/11 11:03 AM
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United Socialist States of Ame...
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tboomer Offline
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My 512 is an RB...Already had the intake and dizzy. It is undercammed and could use better heads. But at this time I am done spending money on it..


Need your rear end checked out? Contact Grizzly!!
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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Posts: 5,160
Texas
dannysbee Offline
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Texas
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.
Re: What's up with 512" combo's? [Re: dannysbee] #1018032
06/22/11 11:24 AM
06/22/11 11:24 AM
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Posts: 2,528
Mansfield, Tx
Jacob Pitt Offline
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Mansfield, Tx
I've never run low deck stuff and never really saw the point of them, but I didn't know the facts either. Pretty interesting stuff here.


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