Intake Manifold Porting Show ‘n Tell

[Bigchief632]

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.

Does it have any taper? Generally the calculation for runner length is including the port in the head, but I think you may be surprised. I think it will work good. If it was me, i'd test it against a Performer RPM, and a Torquer 2 or Strip dominator. That would be an interesting test. What's the engine combo, target rpm?

[ChopperScott]

I've got someone interested in my Trick Flow manifold. The engine is a 405, 4.145 bore 3.75 stroke, 11.5 compression, solid roller (264/274 @ .050. .748/.752), and QF950 carb. It's in a 3400# Nova street car that has run 10.13 at 131 with an un-ported, older cast version of the 2925 Super Victor. The heads are Speier VFactor v2.70 heads (1.30" x 2.30") for use with a Fast Burn 1289 gasket (1.30" x 2.31"). Opinions?

VFactor v2.70PF Ports 1.300 by 2.300.jpeg

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[ChopperScott]

I didn't mention that the ports are currently 1.25" x 2.18" for use on AFR 245 heads at 1.30" x2.20". I don't plan to thin the divider wall to account for installation error, and is scribed accordingly. The outer wall grid is aligned with the gasket. I'm concerned with the roof of the ports sealing properly, but he's not. With half of the blue printoseal exposed on the 2925, he had no issues.

[289nate]

I'm concerned with the roof of the ports sealing properly, but he's not. With half of the blue printoseal exposed on the 2925, he had no issues.

Having the same issue with AFR 220’s on an 8.2 deck SBF build.

[ChopperScott]

I'm concerned with the roof of the ports sealing properly, but he's not. With half of the blue printoseal exposed on the 2925, he had no issues.

Having the same issue with AFR 220’s on an 8.2 deck SBF build.

What manifold?

[ChopperScott]

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[ChopperScott]

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[289nate]

Vic Jr and first gen knock off Parker Funnel Web. I have a source for custom sized port and thickness manifold gaskets. Goes by EDC here. Also Mark O’Neal aka pistonguy and his business partner Toby Aldrate have plans. All good people. Calvin Elston has my cylinder head and doing my headers obviously. Nicest and one of the easiest to communicate with people I have worked with. Trying to get things in so my ten year old son has something to play with that I can be involved with as he gets older.

[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.

Does it have any taper? Generally the calculation for runner length is including the port in the head, but I think you may be surprised. I think it will work good. If it was me, i'd test it against a Performer RPM, and a Torquer 2 or Strip dominator. That would be an interesting test. What's the engine combo, target rpm?

This intake does not have any taper. My redesign has some taper. I wasn't sure how much I needed so I just "put some in there".

Unfortunately, I don't have any other intakes to test. I have been out of the big block mopar world for about 20 years and just getting back into it. I gave a lot of stuff away... oh, the regrets...

The combo I put together started out as a low deck 383 and is now a 496 (4.31 x 4.25). Trick Flow 240 heads, comp cams hyd roller 252/258 @ 0.050 - .571 lift. I haven't thought much about the RPM range. It is going in a truck that I just put a Tremec TKX 5-speed in. I really should start a build thread.

[Dave B]

Runner that long will need decent amount of taper for sure.

[ChopperScott]

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[FC-Pilot]

Scott, what is the purpose of the trough in the floor there?

Paul

[mt-engines]

Scott, what is the purpose of the trough in the floor there?

Paul

He probably thought the casting core blemish was there on purpose. So he accented it.

My question to Scott is. Why are you posting so many pictures of hitting everything with a grinder and calling it good?

I see a lot of time wasted in all the wrong places.

You should have just left them untouched and ran them.. then you would have seen what you did was either worth it or a complete waste of time.

[FC-Pilot]

Scott, what is the purpose of the trough in the floor there?

Paul

He probably thought the casting core blemish was there on purpose. So he accented it.

My question to Scott is. Why are you posting so many pictures of hitting everything with a grinder and calling it good?

I see a lot of time wasted in all the wrong places.

You should have just left them untouched and ran them.. then you would have seen what you did was either worth it or a complete waste of time.

I wondered if it might have been a blemish as well as I have never seen something shaped like that on the floor. I figured I would give him a chance to explain his thinking.

[ChopperScott]

Scott, what is the purpose of the trough in the floor there?

Paul

That is a good question.

He probably thought the casting core blemish was there on purpose. So he accented it.

My question to Scott is. Why are you posting so many pictures of hitting everything with a grinder and calling it good?

I see a lot of time wasted in all the wrong places.

You should have just left them untouched and ran them.. then you would have seen what you did was either worth it or a complete waste of time.

I could easily epoxy the "U" in the floor back to shape. Very little material was removed to shape it like that. It's mostly refinishing. I accented the floor to look like this, working with the location of the peak that is there.

Wilson Plenum.jpeg

All my pictures are open to criticism. You're welcome to educate me concerning any mistakes I may have made. Would you be interested in A/B testing one of my manifolds against an as-cast version? Let me know.