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Will this piston/stroke/rod length work?
#235521
02/25/09 12:41 AM
02/25/09 12:41 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Mathematically this should work, but will the rod length be ok and not pull too much of the piston ABDC? 4.375 stroke 6.9 rod 1.621 comp height 10.725 deck height What do you think? 
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: Sport440]
#235523
02/25/09 12:39 PM
02/25/09 12:39 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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OP
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Joined: Oct 2003
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NE Oklahoma
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Quote:
That will depend on the diameter of the crank counterweights and the contour of the piston skirts and thickness at the wristpin.
To the Deck the math is fine. So is my quick math to BDC. with a 7.25" crank. If things get close get the Makita, out. mike 
Mike,
Thanks for your reply.  If I do have clearance issues, can I turn the counterweights down and rebalance?
Seems like this combo uses 7.1 rods usually, but I already have the pistons and started
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: Von]
#235524
02/25/09 12:54 PM
02/25/09 12:54 PM
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Joined: Jan 2003
Posts: 74,948
U.S.S.A.
JohnRR
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I Win
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Quote:
Quote:
That will depend on the diameter of the crank counterweights and the contour of the piston skirts and thickness at the wristpin.
To the Deck the math is fine. So is my quick math to BDC. with a 7.25" crank. If things get close get the Makita, out. mike
Mike,
Thanks for your reply. If I do have clearance issues, can I turn the counterweights down and rebalance?
Seems like this combo uses 7.1 rods usually, but I already have the pistons and started
One thing you need to be concerned about is how far the pistons pulls out the bottom of the bore with the shorter rod .
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Re: Will this piston/stroke/rod length work?
[Re: B1MAXX]
#235526
02/25/09 01:13 PM
02/25/09 01:13 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
I run a 4.3 stroke with a 6.7 rod. If that helps
Do you know what the diameter is of your counterweights?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: B1MAXX]
#235528
02/25/09 01:16 PM
02/25/09 01:16 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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OP
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Posts: 3,698
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Quote:
Not off the top of my head but it is an out of the box Ohio crank.
Thanks!! I'll look it up.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: B1MAXX]
#235530
02/25/09 01:35 PM
02/25/09 01:35 PM
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Joined: Jan 2003
Posts: 74,948
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,948
U.S.S.A.
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Quote:
I run a 4.3 stroke with a 6.7 rod. If that helps
B or RB ???
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Re: Will this piston/stroke/rod length work?
[Re: AndyF]
#235532
02/25/09 01:45 PM
02/25/09 01:45 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
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OP
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NE Oklahoma
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Quote:
You'll be fine, where did you find a 6.90 long rod? The popular rods are 6.70, 6.80 and 7.10. I've seen a couple of other lengths but never 6.90.
I was thinking I had seen a 6.9. But, I went back and looked and I was wrong. Back to the figuring. 
What about 4.5 stroke with a 6.8 rod? It figures to be .054 down in the hole. Will that combo pull too much out at BDC?
Last edited by Von; 02/25/09 01:49 PM.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: JohnRR]
#235533
02/25/09 11:03 PM
02/25/09 11:03 PM
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Joined: May 2005
Posts: 1,961
Apollo, PA.
B1MAXX
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Quote:
Quote:
I run a 4.3 stroke with a 6.7 rod. If that helps
B or RB ???
rb
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Re: Will this piston/stroke/rod length work?
[Re: n_bogie1984]
#235535
02/25/09 11:40 PM
02/25/09 11:40 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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OP
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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I checked and the compression height is 1.633
So would 4.5 stroke, 6.8 rod, work? I come with .042 in the hole.
Would it be ok with a 7.48 counter weight? What about bdc?
Thanks
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: n_bogie1984]
#235536
02/25/09 11:41 PM
02/25/09 11:41 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
http://store.summitracing.com/partdetail.asp?part=ESP%2D6860C3D&autoview=sku
how about a 6.86 hemi rod will leave ya about .056 in the hole
Good idea 'cept I need a bbc width rod.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: RemCharger]
#235539
02/26/09 10:06 AM
02/26/09 10:06 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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[quoteWhy, are you using a bbc crank?
Some if not most of the aftermarket cranks are set up for a BBC rod.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: B1MAXX]
#235541
02/26/09 05:37 PM
02/26/09 05:37 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
Why not just use 7.1 rod 1.313 piston (3.75 stroke 400 shelf piston) and 4.5 stroke rb and deck the block for desired comp ratio?
Cuz I already have the pistons.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Will this piston/stroke/rod length work?
[Re: B1MAXX]
#235543
02/26/09 11:30 PM
02/26/09 11:30 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
|
Quote:
6.8 rod 4.5 stroke deck for comp. ratio. Or do you have the crank too?
Dont have the crank. But, if I decide to do the 4.5 stroke, I'll do like you say. Shouldnt be a big deal.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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