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Re: Sonic Test
[Re: CharlieB]
#603148
02/03/10 10:15 PM
02/03/10 10:15 PM
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Joined: May 2007
Posts: 1,443
Maryland
Dads426
pro stock
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pro stock
Joined: May 2007
Posts: 1,443
Maryland
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For race only, most builders like to see at least 0.200" on the major thrust surfaces. I brought 3 blocks to BG and two didn't meet his criteria. We are making about 700 HP.
Last edited by Dads426; 02/03/10 10:25 PM.
2012 422 Allstars NSS Champion
2013 422 Allstars NSS Champion
2014 422 Allstars NSS Champion
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Re: Sonic Test
[Re: CharlieB]
#603149
02/03/10 10:18 PM
02/03/10 10:18 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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What exactly is "minimum thickness" is a point of debate. I own a good tester and I use .120 as a minimum thickness on major thrust (that's the right side wall of each hole when looking down on the engine from the rear). Some go .150, some say .200. It should be between your machinist and you, and thicker the better. Sleeve holes if you dont have extra blocks and fine a thin one or two. If you can scan and post the results it might be easier for others to comment.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Sonic Test
[Re: moper]
#603150
02/03/10 10:32 PM
02/03/10 10:32 PM
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Joined: Mar 2003
Posts: 1,301
Edgartown, MA/ Greene, ME
CharlieB
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,301
Edgartown, MA/ Greene, ME
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Quote:
What exactly is "minimum thickness" is a point of debate. I own a good tester and I use .120 as a minimum thickness on major thrust (that's the right side wall of each hole when looking down on the engine from the rear). Some go .150, some say .200. It should be between your machinist and you, and thicker the better. Sleeve holes if you dont have extra blocks and fine a thin one or two. If you can scan and post the results it might be easier for others to comment.
I'll scan the results when I pickup the engine thanks
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Re: Sonic Test
[Re: moper]
#603151
02/03/10 11:01 PM
02/03/10 11:01 PM
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Joined: Aug 2003
Posts: 43,221
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,221
Bend,OR USA
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Quote:
What exactly is "minimum thickness" is a point of debate. I own a good tester and I use .120 as a minimum thickness on major thrust (that's the right side wall of each hole when looking down on the engine from the rear). Some go .150, some say .200. It should be between your machinist and you, and thicker the better. Sleeve holes if you dont have extra blocks and fine a thin one or two. If you can scan and post the results it might be easier for others to comment.
 I have seen 400 blocks raced(N/A only) sucessfully with .120 wall thickness on the major thrust for hundreds of runs, these where 13.0 to 1 motors tuned properly for no detonation on good quality race gas  One of them had a small spot on the front of one cylinder that sonic .090 at the top and .072 at the bottom of that cylinder, I recommended not using it but he did anyways,  sucessfully for four years chasing NHRA points in SG all over the country 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Sonic Test
[Re: CharlieB]
#603154
02/11/10 02:44 PM
02/11/10 02:44 PM
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Joined: Jan 2003
Posts: 502
St Louis, Missouri
Runnin74
mopar
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mopar
Joined: Jan 2003
Posts: 502
St Louis, Missouri
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Okay just so I understand this. Lets use the OP's numbers and assume they are for a block that has not been bored yet. I notice that the #1 hole is off in one direction (I assume core shift) - thrust side 173 and non thrust 180. Can you just push the new bore toward the non-thrust side to cut as little as possible from the thrust side. How much movement of the bore can a block sustain without having geometry problems relative to the crank, rods, pistons etc.
Last edited by Runnin74; 02/11/10 02:44 PM.
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Re: Sonic Test
[Re: Runnin74]
#603157
02/11/10 03:35 PM
02/11/10 03:35 PM
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Joined: Mar 2003
Posts: 1,301
Edgartown, MA/ Greene, ME
CharlieB
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,301
Edgartown, MA/ Greene, ME
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Quote:
Okay just so I understand this. Lets use the OP's numbers and assume they are for a block that has not been bored yet. I notice that the #1 hole is off in one direction (I assume core shift) - thrust side 173 and non thrust 180. Can you just push the new bore toward the non-thrust side to cut as little as possible from the thrust side. How much movement of the bore can a block sustain without having geometry problems relative to the crank, rods, pistons etc.
The machine shop that cleaned, magged and sonic tested the block said they can push the bore a little away from the weak side but I'm not planning on using that shop for my build. The block has not been bored yet.
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Re: Sonic Test
[Re: Stanton]
#603159
02/11/10 08:57 PM
02/11/10 08:57 PM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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The core shift is in the right direction (resulting in heavier major thrust side on 7 out of 8 cylinders)
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: Sonic Test
[Re: Stanton]
#603160
02/11/10 09:01 PM
02/11/10 09:01 PM
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Joined: Mar 2003
Posts: 1,301
Edgartown, MA/ Greene, ME
CharlieB
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,301
Edgartown, MA/ Greene, ME
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Quote:
How much did they charge for the sonic check??
Also, they usually check it in at least 2 points up and down the bore. They've only done yours in one!
For the sake of a few thou I wouldn't offset the bores.
$189.00 for the block cleaning, magnaflux and sonic.
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Re: Sonic Test
[Re: CharlieB]
#603161
02/11/10 09:35 PM
02/11/10 09:35 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
mopar
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mopar
Joined: Jun 2009
Posts: 644
Minnesota
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I think it's dependent on how much powerthe motor makes. Issue is keeping the bores round. 700+hp motors I'd want min .185. 1000hp more! You must keep that ring seal to have leakdown numbers. We loose a tenth in ET when only 1 cyl goes to 13-15.
The little old lady from Pasadena is back!
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Re: Sonic Test
[Re: CharlieB]
#603164
02/11/10 10:17 PM
02/11/10 10:17 PM
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Joined: May 2005
Posts: 6,446
NJ-USA
HPMike
master
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master
Joined: May 2005
Posts: 6,446
NJ-USA
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Quote:
Hoping to get in the mid-low nines in a lightened A-body- I guess around 700 hp should do it
I would think with the level of performance desired you would be advised to get an aftermarket block. I am sure you will hear countless people tell you that they did it with no problem, but you are asking a lot of the factory piece. 
MB
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