7.1 h beam strength?
#2877950
01/21/21 04:27 PM
01/21/21 04:27 PM
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Joined: Jan 2003
Posts: 10,020 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Frostbitefalls MN (Rocky&Bullw...
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I am looking at Molnor or K1 7.1 long hbeams for my new shortblock. Someone from Campbell enterprises said the Molnors would be on the edge at 1000 hp. I will have a stroke of 4.315 and flat top 4.5 bore 1.45 compression height Gibtech piston, lightened, and rpm will be 7500 or less. About 950 hp. 15/1 compression and alky. Is there a differance between Molnor or K1 in strength? Any other options for a 7.1 rod?
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 7.1 h beam strength?
[Re: gregsdart]
#2877964
01/21/21 04:50 PM
01/21/21 04:50 PM
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Joined: Feb 2003
Posts: 1,107 Massillon, Ohio
cudatom
super stock
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super stock
Joined: Feb 2003
Posts: 1,107
Massillon, Ohio
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Not sure but I chose Oliver 7.1 I beams for my 553(4.5 bore 4.35 stroke ) build. Compression will be a tad less than yours and should cross the line at the same rpm. I just wasn't comfortable with the others given the cost of my KB block.
Not that Olivers can't fail but I think it would be less likely.
Ok
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Re: 7.1 h beam strength?
[Re: cudaman1969]
#2878002
01/21/21 06:36 PM
01/21/21 06:36 PM
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Joined: Mar 2005
Posts: 3,024 NY
B1duster
master
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master
Joined: Mar 2005
Posts: 3,024
NY
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Is crank set up for Mopar or Chevy width rods ?
On the cheap Eagle with L-19 bolts Not so cheap Oliver Crower ? and deep pockets Carrillo
Last edited by B1duster; 01/21/21 07:07 PM.
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Re: 7.1 h beam strength?
[Re: B1duster]
#2878030
01/21/21 07:53 PM
01/21/21 07:53 PM
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Joined: Jan 2003
Posts: 10,020 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Like it or not i may have to go with Manley or Oliver rods, about 850 more than the h beams i was looking at. I got away with running Molnor 6.86 Hemi H beams in the megablock, but what shakes my confidance in the 7.1 rods is the fact that the 7.1 rods are 11 grams lighter than the 6.86 rods.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: 7.1 h beam strength?
[Re: EchoSixMike]
#2878053
01/21/21 08:22 PM
01/21/21 08:22 PM
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Joined: Mar 2006
Posts: 9,882 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,882
MI, usa
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HP means squat. What counts is reciprocating weight, rpm, and load if you run a power adder. The 7.100 rods are a modern design where unnecessary bulk was removed. Call Tom and ask. He'll give you an honest answer. Mine has Molnar 7.100". The bobweight is 2222. I was told my self imposed 7500 rpm limit was safe. Though it only runs to about 7300. Doug
Last edited by dvw; 01/21/21 08:26 PM.
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Re: 7.1 h beam strength?
[Re: B1duster]
#2878070
01/21/21 09:02 PM
01/21/21 09:02 PM
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Joined: Oct 2006
Posts: 1,264 New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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My friends rb stroker used the Callies Ultra I beam rod. Part no U15270 Very nice piece. Not cheap but supposed to be a pretty stout piece. Quality was very good and so was machining ootb.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: 7.1 h beam strength?
[Re: gregsdart]
#2878085
01/21/21 09:24 PM
01/21/21 09:24 PM
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Joined: Jan 2004
Posts: 903 Saskatchewan, Canada
cudabin
super stock
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super stock
Joined: Jan 2004
Posts: 903
Saskatchewan, Canada
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Hey Greg,
I went with the Oliver pro billet option, and the peace of mind has been worth it to me...
Good Luck,
Arnie
67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...)
70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
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Re: 7.1 h beam strength?
[Re: Cab_Burge]
#2878115
01/21/21 10:19 PM
01/21/21 10:19 PM
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Joined: Mar 2003
Posts: 6,341 Heaven
EvilB1Dart
master
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master
Joined: Mar 2003
Posts: 6,341
Heaven
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Oliver H Beams or GRP Alum.
"Any fool can know. The point is to understand"
- A. Einstein
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Re: 7.1 h beam strength?
[Re: B1duster]
#2878201
01/22/21 03:40 AM
01/22/21 03:40 AM
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Joined: Mar 2005
Posts: 3,024 NY
B1duster
master
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master
Joined: Mar 2005
Posts: 3,024
NY
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Re: 7.1 h beam strength?
[Re: dvw]
#2878343
01/22/21 01:15 PM
01/22/21 01:15 PM
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Joined: Jan 2003
Posts: 10,020 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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OP
I Live Here
Joined: Jan 2003
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Frostbitefalls MN (Rocky&Bullw...
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Thanks everybody. I talked to Ed at Molnar, he said the 7.1 rods from Molnar would be fine. Two other things that will help- the new piston is going to be lighter and i plan to go to a clean neutral valvebody.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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