Intake Manifold Porting Show ‘n Tell

[1980RS]

Years ago I remember extending the runner dividers was the hot ticket to pick up some HP and tq. I had a Holley 300-2 strip dominator that worked pretty well on my 355 SBC at the time. Another machinist was putting in those dividers but they only went from the middle of the divider down to the port floor. Guy said I would pick up 2 tenths and some MPH if I did this mod. Well like a big dummy I went for it and my car slowed down with the mod no matter what I jetted the carb inc adding a spacer and other things to try and get it to go better. Took out the little dividers and with some Muscle went over and had a chat with the guy, all I got was blah blah blah answers, until my rather big friend started a conversation with this guy. I got a full refund at that point, while in theory the extension idea is good, it does not work on every intake I found out from other racers. Make you wonder why the intake manufacturers did not do this with every single plane intake if it was so good? look at the 2526 Eddy intake, the rather long runner dividers rather hurt that one for sure.

[289nate]

8.2 deck for Vic Jr with runner extensions I ran on a 6,000 rpm 300’ish hp 289. Brought some low end, torque back to that motor and made it run like the previous dual plane. Would not put it onto anything serious. Stashed away as a conversation piece.

[289nate]

Ford Vic Jr a guy I knew had. Went back and forth between Billy Glidden and Wilson manifolds a few times to get to this point. Done years back. Got to get a little ford stuff sprinkled in.

[ChopperScott]

Years ago I remember extending the runner dividers was the hot ticket…

Modifying the plenum may, or may not, be beneficial depending on the application, rpm range, etc. Your machinist may have had positive feedback from a different combo. Not all machinists are engine builders.

[ChopperScott]

Next one on the bench is this Trick Flow R-series...

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[Dave B]

Edel 2916 bbc

[arlancam509]

I wondered aloud if I could print an intake manifold. I figured why not. I quickly threw a design together in my favorite cad program (aka the one I use everyday) and made something look pretty. What came out wasn’t the best ports and runners. In fact, a fella could argue they are downright terrible. That’s not the point! I needed to prove that I could do it!

After many failed attempts (shown in the last picture), I finally got 2 halves printed.

Hmm… I think this might work. Now where did I put the rest of the engine?

Also, I realize this is the "porting show 'n tell" topic - I just wanted to throw this out there. Obviously, if this is not appropriate, I will remove my post. I'll be back once I get a good runner design that I can show off.

[FC-Pilot]

I wondered aloud if I could print an intake manifold. I figured why not. I quickly threw a design together in my favorite cad program (aka the one I use everyday) and made something look pretty. What came out wasn’t the best ports and runners. In fact, a fella could argue they are downright terrible. That’s not the point! I needed to prove that I could do it!

After many failed attempts (shown in the last picture), I finally got 2 halves printed.

Hmm… I think this might work. Now where did I put the rest of the engine?

Also, I realize this is the "porting show 'n tell" topic - I just wanted to throw this out there. Obviously, if this is not appropriate, I will remove my post. I'll be back once I get a good runner design that I can show off.

Bolt it on and run it! You never know until you try. I would love to print some intake ideas I have (that I am sure probably won’t work).

Paul

[ChopperScott]

Trick Flow R-series...

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[Dave B]

I wondered aloud if I could print an intake manifold. I figured why not. I quickly threw a design together in my favorite cad program (aka the one I use everyday) and made something look pretty. What came out wasn’t the best ports and runners. In fact, a fella could argue they are downright terrible. That’s not the point! I needed to prove that I could do it!

After many failed attempts (shown in the last picture), I finally got 2 halves printed.

Hmm… I think this might work. Now where did I put the rest of the engine?

Also, I realize this is the "porting show 'n tell" topic - I just wanted to throw this out there. Obviously, if this is not appropriate, I will remove my post. I'll be back once I get a good runner design that I can show off.

Holy long runner batman.Fuel charge will need gps to find the valve.lol

[1980RS]

I wondered aloud if I could print an intake manifold. I figured why not. I quickly threw a design together in my favorite cad program (aka the one I use everyday) and made something look pretty. What came out wasn’t the best ports and runners. In fact, a fella could argue they are downright terrible. That’s not the point! I needed to prove that I could do it!

After many failed attempts (shown in the last picture), I finally got 2 halves printed.

Hmm… I think this might work. Now where did I put the rest of the engine?

Also, I realize this is the "porting show 'n tell" topic - I just wanted to throw this out there. Obviously, if this is not appropriate, I will remove my post. I'll be back once I get a good runner design that I can show off.

That's pretty cool in my book, amazing what you can make these days with modern technology. Nice work.

[arlancam509]

I wondered aloud if I could print an intake manifold. I figured why not. I quickly threw a design together in my favorite cad program (aka the one I use everyday) and made something look pretty. What came out wasn’t the best ports and runners. In fact, a fella could argue they are downright terrible. That’s not the point! I needed to prove that I could do it!

After many failed attempts (shown in the last picture), I finally got 2 halves printed.

Hmm… I think this might work. Now where did I put the rest of the engine?

Also, I realize this is the "porting show 'n tell" topic - I just wanted to throw this out there. Obviously, if this is not appropriate, I will remove my post. I'll be back once I get a good runner design that I can show off.

That's pretty cool in my book, amazing what you can make these days with modern technology. Nice work.

Thank you!!!

[Bigchief632]

I wondered aloud if I could print an intake manifold. I figured why not. I quickly threw a design together in my favorite cad program (aka the one I use everyday) and made something look pretty. What came out wasn’t the best ports and runners. In fact, a fella could argue they are downright terrible. That’s not the point! I needed to prove that I could do it!

After many failed attempts (shown in the last picture), I finally got 2 halves printed.

Hmm… I think this might work. Now where did I put the rest of the engine?

Also, I realize this is the "porting show 'n tell" topic - I just wanted to throw this out there. Obviously, if this is not appropriate, I will remove my post. I'll be back once I get a good runner design that I can show off.

That's sweet. I'd try it too personally. I think it would work great in the rpm range that mopar will likely run. The long runners will be a plus, and being equal length, or close it appears. I will say though, it needs a better carb flange to runner transition, a 1 inch spacer will help that. It appears you need to clean out the runners, other than that, is the material strong enough to run it?

[arlancam509]

That's sweet. I'd try it too personally. I think it would work great in the rpm range that mopar will likely run. The long runners will be a plus, and being equal length, or close it appears. I will say though, it needs a better carb flange to runner transition, a 1 inch spacer will help that. It appears you need to clean out the runners, other than that, is the material strong enough to run it?

I used carbon fiber impregnated nylon. It is supposed to be strong enough for Real Parts™, so we shall see. I do plan to run this thing. It is going to be interesting to see what it does. I don't have high hopes, so I am not going to be disappointed. If it does OK, I will print the new design. Now that I am thinking about it, I should probably start a new thread and let you guys tear apart the new design.

The runners are fairly close to equal length. I used a couple different calculators and 11 inches (roughly) was the recommendation for the runner length. Now that I think about it though, does that length include the cylinder head port? Also, the support material inside the runners took damn near 2 hours to remove. I should probably print the next one in several pieces, but it will look more impressive (I think) as one piece.

I also don't like the carb flange to runner transition. I did that part last and it shows. My newer design looks a little better.

[Dave B]

Total intake tract.Valve to plenum.Your head is probably 5" give or take so 6" runner in manifold.