Tunnel ram plenum spacer

[younggun2.0]

What’s up guys. Im starting my 572” build and am running a Indy tunnel ram with twin 1050 dominators. I can’t seem to find any info about plenum spacers…. I plan to build a 1-2” plenum spacer under my top plate. It’s my understanding that big cubes likes more plenum volume. Anyone see a downside? In all honesty my main reason besides a few HP is that I like the obnoxious look of a crazy tall engine hanging above the hood and I want a place to mount my single inlet, 4 outlet fuel pressure regulator in front of the intake without having to modify the intake. Let’s hear it boys. What do you think?

 

[TT5.9mag]

They work on some stuff and hurt power on other stuff. Way too many variables to say it always helps or always hurts. But one thing is for sure they ALWAYS look bad ***. Are you not going to dyno this engine? That’s the only way to know.

 

[MOPARMAGA]

What’s up guys. Im starting my 572” build and am running a Indy tunnel ram with twin 1050 dominators. I can’t seem to find any info about plenum spacers…. I plan to build a 1-2” plenum spacer under my top plate. It’s my understanding that big cubes likes more plenum volume. Anyone see a downside? In all honesty my main reason besides a few HP is that I like the obnoxious look of a crazy tall engine hanging above the hood and I want a place to mount my single inlet, 4 outlet fuel pressure regulator in front of the intake without having to modify the intake. Let’s hear it boys. What do you think?

View attachment 1716518669

I would just mill one like you said, or a couple stacked plate deal of 1 inch plates, that way you can mess with tuning.That's going to be pretty badass I imagine probably 820-840 HP.

 

[Oldmanmopar]

Will you put red lights on the air cleaners for air traffic control warning ? Could also Possibly mount a third brake light on the rear one.

They do sell 4 foot polished stainless stove pipe at your local wood stove store.
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I believe its a little much but what ever floats your boat. If you are looking for attention you will be sure to get a lot of finger pointing .

I could see it now . Poking a hole in the roof above the lift. Then going up on the roof to adjust the idle.

 

[younggun2.0]

They work on some stuff and hurt power on other stuff. Way too many variables to say it always helps or always hurts. But one thing is for sure they ALWAYS look bad ***. Are you not going to dyno this engine? That’s the only way to know.

It will get dyno tested but I think it’ll stay no matter what. The engine is going in my dart and it’s only track legal to 10.0 in the 1/4 and it’s already faster than that with my 470” build.

 

[MOPARMAGA]

It will get dyno tested but I think it’ll stay no matter what. The engine is going in my dart and it’s only track legal to 10.0 in the 1/4 and it’s already faster than that with my 470” build.

Where do you run your car mostly, at Pacific?

 

[Newbomb Turk]

I would be very careful about adding a bunch of plenum volume on a manifold like that.

It’s not a 1970’s design.

You can keep adding volume on the dyno and it will make more power

In the car it will be a pig off the brake or the pedal if you foot brake it. It will be slow off the gear change(s).

You really need to test that in the car.

 

[MOPARMAGA]

I would be very careful about adding a bunch of plenum volume on a manifold like that.

It’s not a 1970’s design.

You can keep adding volume on the dyno and it will make more power

In the car it will be a pig off the brake or the pedal if you foot brake it. It will be slow off the gear change(s).

You really need to test that in the car.

He wants the look though

 

[TT5.9mag]

He wants the look though

And it sounds like he’s got an abundance of power already so it matters not what the spacer does as long as it looks cool.

 

[MOPARMAGA]

And it sounds like he’s got an abundance of power already so it matters not what the spacer does as long as it looks cool.

Yep

 

[Woody500]

What do spacers do for a 413 Long Ram Intake. Do the torque and hp curves move up or down. Just for comparison.
I'm assuming Indy builds and tested them with a certain rpm response rate and range expected. What do you expect?
Is it worth it to change over at the track, so you can do back to back runs? Just for looks?

 

[MOPARMAGA]

What do spacers do for a 413 Long Ram Intake. Do the torque and hp curves move up or down. Just for comparison.
I'm assuming Indy builds and tested them with a certain rpm response rate and range expected. What do you expect?
Is it worth it to change over at the track, so you can do back to back runs? Just for looks?

It's a little more plenum volume, and velocity with 4 to 1 tapered spacers.
probably raise or stay the same but just add a little power.
2 inch super suckers were the best tested on my engine. 2nd best was the super suckers flipped upside down lol

 

[Danny Bellmore]

I would be very careful about adding a bunch of plenum volume on a manifold like that.

It’s not a 1970’s design.

You can keep adding volume on the dyno and it will make more power

In the car it will be a pig off the brake or the pedal if you foot brake it. It will be slow off the gear change(s).

You really need to test that in the car.

Do you happen to still have your small block tunnel ram? I am have one heck of a time trying to get this Indy intake welded up. The porosity is so bad that we are just chasing ourselves at this poin.

 

[MOPARMAGA]

Do you happen to still have your small block tunnel ram? I am have one heck of a time trying to get this Indy intake welded up. The porosity is so bad that we are just chasing ourselves at this poin.

Send it to me, I'm a glutton for punishment.
I have plenty of time in on welding cast aluminum & my wieand was exactly the same thing

 

[Danny Bellmore]

Send it to me, I'm a glutton for punishment.
I have plenty of time in on welding cast aluminum & my wieand was exactly the same thing

I have a friend who is doing the welding. We almost have it.
The plan is to finish welding it then epoxy the inside with Irontite added to the coolant.
I have some splash zone epoxy or JB Weld, just not sure what one would be better for the heat. The leakage is between the water neck towards the flange, the amount of porosity is crazy for a $1000.00 intake manifold.

 

[MOPARMAGA]

I have a friend who is doing the welding. We almost have it.
The plan is to finish welding it then epoxy the inside with Irontite added to the coolant.
I have some splash zone epoxy or JB Weld, just not sure what one would be better for the heat. The leakage is between the water neck towards the flange, the amount of porosity is crazy for a $1000.00 intake manifold.

When I was done with mine, I just coated the exterior with splash zone, the inside got splash zone just to add some shape.
Yeah it's insane what isn't there when u start welding big holes open up quick.

 

[6PKRTSE]

I made several 1/4" thick with nylon/derlrin spacers and several gaskets to match. We dyno'd it with 1/4" and went in 1/4" increments (+ 2 .020 thick gaskets) each time. Nothing made any considerable difference between the different heights in h.p. or torque. Also tried stacking a couple different 1/4", 1/2", 1", and 2" HVC Super Sucker carb spacers. That difference didn't change much either. It was only a couple horsepower up or the same on each pull. Wound up leaving just a 1/4" plenum spacer and 1/4" carb spacers in.