6 Inch Connecting Rods
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Joined: Sep 2003
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
6 Inch Connecting Rods
I'm posting this for general information. On researching my new short block I have found out that when going to a 6 inch rod the total piston/rod weight is reduced. The will aid in the balancing of your motor and the force applied to the crankshaft at higher rpms.
Also something else I did not know. I was playing with my dynamic compression ratio calculator and with the 6 inch rod at least in my case it lowers the DCR slightly. In my case that is a good thing.
I'm shooting for a static compression ratio of 11.00:1 and a DCR of 8.5:1. Well with the 6 inch rod it brought in the DCR right at 8.51:1 with my target 11.00:1 compression ratio. With the 5.7 inch rod the DCR was a little higher at 8.55:1.
Also the rod angle is a little better with the 6 inch rod. Funny on the horsepower. With DynoSim it says I will gain 2 horsepower. However with PipeMax it says I will loose two horsepower. I'll just call it even.
Also something else I did not know. I was playing with my dynamic compression ratio calculator and with the 6 inch rod at least in my case it lowers the DCR slightly. In my case that is a good thing.
I'm shooting for a static compression ratio of 11.00:1 and a DCR of 8.5:1. Well with the 6 inch rod it brought in the DCR right at 8.51:1 with my target 11.00:1 compression ratio. With the 5.7 inch rod the DCR was a little higher at 8.55:1.
Also the rod angle is a little better with the 6 inch rod. Funny on the horsepower. With DynoSim it says I will gain 2 horsepower. However with PipeMax it says I will loose two horsepower. I'll just call it even.
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Joined: Jul 2004
Posts: 10,763
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From: Calgary, AB, Canada
Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
Re: 6 Inch Connecting Rods
haha, that's pretty standard results when going to a 6" rod. (re: research)
Teeny tiny changes on paper. The actual real world results, well, I think the jury is still out on that. It's such a small difference, I think density altitude, cloud cover, and lunar cycle will have more noticeable effects
Teeny tiny changes on paper. The actual real world results, well, I think the jury is still out on that. It's such a small difference, I think density altitude, cloud cover, and lunar cycle will have more noticeable effects
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: 6 Inch Connecting Rods
Allen still thinks he's building a race car engine in a street car body. You'll never be happy Allen, so just go with the 420ci aluminum small block engine.
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: 6 Inch Connecting Rods
longer rod or stroke= slower reving engine
thats why the 302 that came in the 68 & 9 camaros were so bad ****
thats why the 302 that came in the 68 & 9 camaros were so bad ****
Thread Starter
Supreme Member
iTrader: (3)
Joined: Sep 2003
Posts: 6,859
Likes: 14
From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: 6 Inch Connecting Rods
Hey, just taking advantage of the new technology.
How did I know my car with TPI would want to rev and make good power into the high 6000rpm range.
How did I know my car with TPI would want to rev and make good power into the high 6000rpm range.
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Posts: 998
Likes: 1
From: Bedford Tx
Car: 1991 Z28 1LE
Engine: 370CID GenIII
Transmission: 4l60e
Axle/Gears: 4.33 Moser 9inch
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