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Re: Cross tied main cap
[Re: Monte_Smith]
#1711702
12/17/14 03:53 AM
12/17/14 03:53 AM
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Joined: Jan 2003
Posts: 19,361
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,361
Las Vegas
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As far as the topic goes I agree with with Monte's strategy and do the same myself on stock block deals.
I also do not think the Mega block is the answer to the problem so much either. I have seen plenty of cap walk and fretting on Mega blocks to not feel real comfortable with them either. I have personally killed two of them myself.
FWIW if the original poster wants a set of Mega block caps I have some if you want to give it a shot. But suggest the aluminum cap route.
"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: Cross tied main cap
[Re: Monte_Smith]
#1711704
12/17/14 04:08 PM
12/17/14 04:08 PM
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Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
@#$%&*!
New user name, Same old jerk!
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New user name, Same old jerk!
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
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Quote:
Personally I am NOT a fan of the girdles. I can't see where they address anything in the weak area of the blocks, which is the webbing. On a stock block, if I MUST run one, I put alum caps on and call it a day
Monte
I think the block webbing/saddle area would hold up fine if it didn't have the main caps tightly bolted to it, caps that holds ALL if the crank forces in check. To put it another way, it's the forces in the caps that stress the block saddles. Anything that significantly reduces motion of the caps will reduce stress in the saddles.
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Re: Cross tied main cap
[Re: @#$%&*!]
#1711705
12/17/14 04:48 PM
12/17/14 04:48 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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I know all the theories and hear all the claims of how the girdles help...........I just don't buy it and don't use them. Doesn't make me right or wrong, just my opinion.
The cap and the webs are the weak link. You put a better cap on it, the webs take the brunt. You put a girdle on it, the webs STILL take the brunt. You put alum caps on and for lack of a better way to phrase it, the caps absorb some of the pounding. I think THAT works better and is the way I choose to do it. If the webs were thicker and had splayed caps like other motors, this would be a non issue. Unfortunately that is NOT the case and we have what we have. As AL said, even the cross bolted Mega block doesn't SOLVE the issue, but the block is better, has more meat, better metal, better cap and cross bolts........so it SURVIVES better, but is not FIXED. You are not going to FIX something that has a poor design without a total re-engineer. So your option is to crutch it and make it as good as it can be. With a skirted block, MASS is your option, since splayed caps aren't
Monte
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Re: Cross tied main cap
[Re: Stanton]
#1711709
12/17/14 10:33 PM
12/17/14 10:33 PM
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Joined: Jan 2003
Posts: 32,394
Quicktree
I Win
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I Win
Joined: Jan 2003
Posts: 32,394
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Quote:
I don't think a motor with 820 passes on it needs crossbolted mains or a girdle !!!
820 passes @ 6000 rpm is nothing...
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Re: Cross tied main cap
[Re: Quicktree]
#1711710
12/17/14 10:44 PM
12/17/14 10:44 PM
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Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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Quote:
Quote:
I don't think a motor with 820 passes on it needs crossbolted mains or a girdle !!!
820 passes @ 6000 rpm is nothing...
That would be like 410 @ 12000,,,,,,I'd call that good. 
Last edited by CHAPPER; 12/17/14 10:45 PM.
If you like drag racing, support your local track.
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Re: Cross tied main cap
[Re: Quicktree]
#1711711
12/18/14 03:53 AM
12/18/14 03:53 AM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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Quote:
Quote:
I don't think a motor with 820 passes on it needs crossbolted mains or a girdle !!!
820 passes @ 6000 rpm is nothing...
The 820 passes, nor the rpm has anything to do with it. All that matters is the power level. This motor obviously doesn't make much of that, so the cap issue is really a non issue.
Monte
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Re: Cross tied main cap
[Re: Monte_Smith]
#1711712
12/18/14 04:13 AM
12/18/14 04:13 AM
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Joined: May 2003
Posts: 6,561
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,561
Downtown Roebuck Ont
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Quote:
I know all the theories and hear all the claims of how the girdles help...........I just don't buy it and don't use them. Doesn't make me right or wrong, just my opinion.
The cap and the webs are the weak link. You put a better cap on it, the webs take the brunt. You put a girdle on it, the webs STILL take the brunt. You put alum caps on and for lack of a better way to phrase it, the caps absorb some of the pounding. I think THAT works better and is the way I choose to do it. If the webs were thicker and had splayed caps like other motors, this would be a non issue. Unfortunately that is NOT the case and we have what we have. As AL said, even the cross bolted Mega block doesn't SOLVE the issue, but the block is better, has more meat, better metal, better cap and cross bolts........so it SURVIVES better, but is not FIXED. You are not going to FIX something that has a poor design without a total re-engineer. So your option is to crutch it and make it as good as it can be. With a skirted block, MASS is your option, since splayed caps aren't
Monte
Or a cylinder head with a combustion chamber designed in this century that requires 10 deg less timing to make equal or more power.
Kevin
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Why not buy a good block with cross bolt mains and be done with it? I've seen several different brands of crank girdles for BB Mopars, none of them make any sense to me, you are adding some stability from front to rear on the main studs, but those are not the problem on 440 RB motors, the main caps and main webbing are 
I say that and I'm the one that bought the aluminum main caps and ARP main studs from 440 Source last winter so a customer and freind could use a stock 440 block for a new 512 C.I. bracket motorbuild I did for him 
I offered him one of the 4.500 World iron blocks I have and he turned that down 
Your choice, if you have access to a decent 400 block, go that way 
