|
Cylander wall thickness "update"
#1978047
12/28/15 07:21 PM
12/28/15 07:21 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
I know somewhere on this forum this has been discussed before but for the life of me I don't remember where, so here go's,,I know thicker is better but what would be acceptable for minimum thrust side thickness after boring/honing to the size needed, 400 block out to a 4.375 bore.
Last edited by dartman366; 12/29/15 10:10 PM.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: Cylander wall thickness
[Re: dartman366]
#1978089
12/28/15 08:22 PM
12/28/15 08:22 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Bill.. I have heard of guys running .100 wall.. myself I would like .120 or better.. its real hard to find a factory production block with better than .120 when its cleaned up EDIT my mega block had .200 on basically all cylinders with a 4.5 bore(I wasnt going 4.5 but I did have it sonic checked... 64 readings per cyl... that was $75) 
Last edited by MR_P_BODY; 12/28/15 08:25 PM.
|
|
|
Re: Cylander wall thickness
[Re: MR_P_BODY]
#1978161
12/28/15 10:09 PM
12/28/15 10:09 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
Bill.. I have heard of guys running .100 wall.. myself I would like .120 or better.. its real hard to find a factory production block with better than .120 when its cleaned up EDIT my mega block had .200 on basically all cylinders with a 4.5 bore(I wasnt going 4.5 but I did have it sonic checked... 64 readings per cyl... that was $75) Talked to my machinist today, he has one block checked and the other will be done in the morning and will pick them up in the afternoon,,sounds like mine are going to be real good then, at least the first one. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: Cylander wall thickness
[Re: dartman366]
#1978214
12/28/15 11:20 PM
12/28/15 11:20 PM
|
Joined: Nov 2013
Posts: 595
Nashville, Tennessee
Tempest
mopar
|
mopar
Joined: Nov 2013
Posts: 595
Nashville, Tennessee
|
Just my $.02.
On another make I had a 715 HP stock block motor, did not know it at the time but the block had core shift. It was only a +.030" over bore. It came apart in a big way around 7,000 few months later. Measuring some of the block after, thrust side of the #1 cylinder was .080", the other was .300+". Basically anything that moved was ruined. Roller cam bent, roller lifters, valves hit pistons, crank bent, even bent snout on ATI balancer.
I will never do another motor without sonic checking. Last one I did was .250" and I still filled it.
|
|
|
Re: Cylander wall thickness
[Re: Tempest]
#1978230
12/28/15 11:38 PM
12/28/15 11:38 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
Just my $.02.
On another make I had a 715 HP stock block motor, did not know it at the time but the block had core shift. It was only a +.030" over bore. It came apart in a big way around 7,000 few months later. Measuring some of the block after, thrust side of the #1 cylinder was .080", the other was .300+". Basically anything that moved was ruined. Roller cam bent, roller lifters, valves hit pistons, crank bent, even bent snout on ATI balancer.
I will never do another motor without sonic checking. Last one I did was .250" and I still filled it. having the sonic numbers will help me decide which block I will use, be nice if the second one is as good as the first.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: Cylander wall thickness
[Re: B G Racing]
#1978480
12/29/15 12:29 PM
12/29/15 12:29 PM
|
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
|
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
|
We generally consider anything above .180 on the thrust sides at finish bore a good block... What is your minimum acceptable thickness for a NON-thrust measurement?
|
|
|
Re: Cylander wall thickness
[Re: BradH]
#1978503
12/29/15 12:57 PM
12/29/15 12:57 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
We generally consider anything above .180 on the thrust sides at finish bore a good block... What is your minimum acceptable thickness for a NON-thrust measurement? I can say that every cyl that has cracked on my stuff has been on the NON thrust side.. every one.. they varied from .125 to .160.. that was 5 cyls on multiple blocks(all 340 blocks at 4.070 bores)
|
|
|
Re: Cylander wall thickness
[Re: dartman366]
#1978765
12/29/15 06:42 PM
12/29/15 06:42 PM
|
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
|
master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
|
We like to see minimal .180 all around but have used blocks at .160 on non thrust sides.Depending on the build and where the cylinder is thin we usually do a short fill. We haven't had much luck with lottery tickets. 
Last edited by B G Racing; 12/29/15 06:43 PM.
|
|
|
Re: Cylander wall thickness "update"
[Re: B G Racing]
#1978904
12/29/15 10:00 PM
12/29/15 10:00 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
had two blocks one was a 1975 the other is a 1976 both came in with the numbers solidly in the .310-.320 range had a spot here and there that was in the mid 200 range worse being 245, and a couple around .260-.280,,95% are .300 or better.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: Cylander wall thickness "update"
[Re: dartman366]
#1979113
12/30/15 01:38 AM
12/30/15 01:38 AM
|
Joined: Aug 2003
Posts: 43,173
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,173
Bend,OR USA
|
Last edited by Cab_Burge; 12/30/15 01:39 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: Cylander wall thickness "update"
[Re: B G Racing]
#1979236
12/30/15 12:04 PM
12/30/15 12:04 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
That's great we usually only see those numbers on the 71 to 73 blocks.How many checks are you doing for each cylinder?Usually #1,#2,#7 and#8 non thrust to the front and back of those cylinders come up thin on those 74 and later blocks. looking at the numbers the front and back numbers are consistantly a little thinner mostly in the mid to upper .200 range, when he checks each bore he will do 4 steps on the thrust and non thrust side and 3 on the front and back of each cylander.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
Re: Cylander wall thickness "update"
[Re: Cab_Burge]
#1979239
12/30/15 12:10 PM
12/30/15 12:10 PM
|
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
|
OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
|
I said somthing to him about doing a half fill and he promptly told me to not waste my time and money and that blocks like that don't need it besides he is not a proponant of using filler because of thermal issues in the cylander.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
|
|
|
|
|
Thicker is way better 
Maybe it is time for you to buy a lottery ticket while your luck is in town 
