The rod ratio, what do you think?
#1324989
10/23/12 04:13 PM
10/23/12 04:13 PM
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Joined: Dec 2010
Posts: 208 Norrland, Sweden
Swedcharger67
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enthusiast
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OP
enthusiast
Joined: Dec 2010
Posts: 208
Norrland, Sweden
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I'm looking at the 400->512 stroker kit from 440 Source. The con rod ratio is 1.537... What do you think about using it for a street cruiser, occasionally doing some strip visits? Engine is going to be strong at low and midrange, fuel is E85, static comp about 12:1, sequential fuel injection and ignition. I'm mainly concerned about the con rod ratio... Cheers,
Martin, 67 Charger, 512 cui, E85, MegaSquirt MS3X sequential ignition & injection
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Re: The rod ratio, what do you think?
[Re: fox]
#1324997
10/29/12 02:45 PM
10/29/12 02:45 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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The engine will be snappier with the shorter rods. For engine speeds 6500 rpm and below, shorter rods and larger ports seem to be the ticket to best average torque. Check out the Enginemasters series.
If you go back in the archives you will see that I was as rabid a long rod guy as there was. However, over the last 10 years or so I have come to understand that longer rods aren't necessarily better for a street engine. For another example, the chevy HT383 is built by chevrolet with a 3.80" stroke and 5.7" rods. That's a R/S ratio of 1.50. This engine passed all the durability tests,which were quite frightening as I recall. They found that at 7000 rpm after hours of running, the connecting rod bolt heads would fail, so they built a new rod specifically for the HT that uses a capscrew. There was enough room in the engine to put in a 5.85" rod or even a 6" rod, they had the L99 rod which is powder metallurgy like what they ended up with and 5.94" long. But they chose to use the 5.7" rod and 1.50 ratio.
R.
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Re: The rod ratio, what do you think?
[Re: 451Mopar]
#1324999
10/31/12 05:50 AM
10/31/12 05:50 AM
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Joined: Dec 2010
Posts: 208 Norrland, Sweden
Swedcharger67
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enthusiast
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OP
enthusiast
Joined: Dec 2010
Posts: 208
Norrland, Sweden
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Many thanks for your comments, now I believe I can focus on other things than the con rod ratio!!!
Martin, 67 Charger, 512 cui, E85, MegaSquirt MS3X sequential ignition & injection
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Re: The rod ratio, what do you think?
[Re: Big Squeeze]
#1325004
11/02/12 11:15 AM
11/02/12 11:15 AM
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Joined: Aug 2003
Posts: 8,716 Baltimore/Denver
64Post
master
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master
Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
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Quote:
Worrying about rod ratio is like peeing in the ocean to raise the tide ...
I just did that and look what happened to New Jersey!
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