6.9 IDI performance help needed!
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
The stock ones are strong enough to handle quite a bit. How much are you planning on doing to it?
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New User
Joined: Oct 2013
Posts: 18
Likes: 0
I have the stock rods, but I accidentally got the rods and caps, and directions they go mixed up, and don't know if this can be fixed by machining the rods or would I have to buy new connecting rods?
Postmaster
Joined: Aug 2010
Posts: 2,554
Likes: 7
From: Northern Arizona
Are they not marked? The engine I just scrapped had identifying letters stamped on the flat edge of the rod and cap to help you keep them matched up and oriented correctly... but that was a '94 factory turbo engine. I guess the NA rods must not have that.
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New User
Joined: Oct 2013
Posts: 18
Likes: 0
Honestly I haven't checked, engine and truck are at a buddy's house. I know some engines (gas) have arrows pointing which direction to face rods towards front of block, would having a machine shop weaken/take away power capablilties of rods? I found some rods on summits racing but not sure if those will or won't hold up as good as the factory rods.
Postmaster
Joined: Aug 2010
Posts: 2,554
Likes: 7
From: Northern Arizona
I don't know what Summit is selling, but I would stick with stock rods. They are tried and true and are ~not a weak point of our engines. Check your parts. They might very well be marked. One thing not yet mentioned here is that IDI's benefit greatly from balancing. If you are building your engine for power, be sure to have that done before final assembly.
Senior User
Joined: Jun 2012
Posts: 282
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Stop worrying about rods, unless you have found a p pump to use for fuel. The stock rods are very stout, and are not known to be a weakness. My motor bounces off of it's rev limiter constantly, and I have stock rods that are lightened and balanced(less material than stock, ground down) and also the n/a caps and rods have letters that match them together.
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Elder User
Joined: Dec 2011
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From: Kodiak, Alaska
I don't know what Summit is selling, but I would stick with stock rods. They are tried and true and are ~not a weak point of our engines. Check your parts. They might very well be marked. One thing not yet mentioned here is that IDI's benefit greatly from balancing. If you are building your engine for power, be sure to have that done before final assembly.
Lead Driver
Joined: Apr 2008
Posts: 6,938
Likes: 13
The rods and caps should have numbers stamped on them indicating where and how they go. Not to sound overly condecending... but why would you tear an engine apart if you didnt know what you were doing? Stock rods should be fine to 500-600whp / 5000rpm.
Senior User
Joined: Feb 2012
Posts: 445
Likes: 6
From: western Oregon
You can get them back together no problem...They all should have marks on them like the ones in my build thread Flickr Page...Flickr: racer30sprint's Photostream.....
check out my pictures of my 7.3 build or look at this one pic of a NA rod http://www.flickr.com/photos/racer30/8573150441/
check out my pictures of my 7.3 build or look at this one pic of a NA rod http://www.flickr.com/photos/racer30/8573150441/
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