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Old 06-05-2010, 11:40 AM
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Intake plenum turtles

I'm planning some intake work on my 3.9L magnum engine. Since there are no aftermarket options, I'm planning on modifying the stock manifold. The manifold is the beer keg style, which has a large plenum volume and a big flat bottom. It's fairly common for people to shorten the runners, clean up the casting marks and unshroud the injector bungs to pick up a few horsepower and move the powerband higher, but I recently talked with someone who built and installed a turtle to fill the plenum volume and help direct airflow towards the ports. He reported a good increase in low end torque.

His design is basically a long, tall triangle that splits the middle of the plenum, peaking 1" from the top with 1/2" space at the edges. I can post pictures later. I'm trying to figure out if the design can be optimized (different size triangle) or if an aftermarket turtle could be adapted and do a better job.

So all of you intake guru's, any rules of thumb about how to go about figuring this out? It might be easier once I get some pictures up of the manifold and the other turtle.

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Old 06-05-2010, 07:01 PM
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In all my 50 years of reading and experimenting, I have never seen or heard anything about what laws of physics pertain to turtles. It is of interest to me though, just as anything automotive is of interest. I suspect that you are all alone in this endeavor though, except for the individual(s) you have identified.

Making different configurations and trying them might be facilitated by the use of a G-meter (accelerometer). Here's a link to an inexpensive home-made unit....
http://www.dimensionengineering.com/...ter/Gmeter.htm

By the way, had some good friends named Zemke here in Arizona in the mid-70's. They were retired here from Houghton Lake, Michigan.
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Old 06-05-2010, 08:09 PM
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Yea, manifold design does seem like a black art. I have a background in physics, and have researched it a little, and I still consider it over my head.

I guess at this point I'm looking for more wisdom than knowledge; even non-specific advice from those that have been there, done that, or someone to glance at the picture and recognize the manifold as being similar in design to a different one that maybe has an after market turtle available.

I'm actually up in Houghton (waaaay up in the UP), which is a few hours north of Houghton Lake, but you are by no means the first person to miss that distinction.
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