Ever wonder why the stock Magnum engines are so hard on gas and has such a problem producing power? These pics are of the inside of a stock '99 V8 intake manifold and MAN WHAT A MESS from the factory! Notice all the protruding casting ridges, rough edges on the runners and all the square edges which causes a tremendous amount of air turbulence and misdirected air flow.






Now take a look at the unbelievable alignment of the runner ports to the heads! The previous gasket marks show ports to be off about 1/4" on the top and a good 1/16" on the sides. Also notice the flow pattern marks (clean area) on the injector ports.




Boredom has a way of making a man do some stupid things so I decided to purchase a complete intake manifold with TB and modify them both with the intake having the aluminum belly pan. It's going to take me a while because of these damn arthritic hands but it'll be a little more fulfilling than sitting around listening to the grass grow!! The TB will be a polished full 50mm air flow. This will be for sale when I'm finished but I have no idea as to when they will be done or how much my asking price will be until I'm finished. Here's what the intake and TB will look like when I'm finished.

 

Like every other manufacturer in the 90's and prior. That's the whole reason "ported and polished" was so popular among enthusiasts. Since the early 00's, most manufacturers have done a lot more porting and polishing from the factory-it's one of the biggest reasons why horsepower and fuel economy has gone up so much.

 

I totally agree with that statement!

 

Yes sir, a little work with a die grinder when changing that plenum plate can make quite a difference. Am also in the process of modifying a JY manifold.

Got waylaid by my waterwell casing developing a hole in it, but things are back on track now. Back to work on the Dodge.

 

I hate to burst your bubble, but the mods you've done to that intake have been performed by many of us Second Gen owners.

 

Has anyone tried filling in the large void in the roof of the plenum with foam and then coating it with epoxy to cut down on the volume without restricting the flow of air to the runners? Also filling the corners where I understand there are high pressure areas?

I'm considering doing this myself after making a making a makeshift flowbench. Don't really know if it would be beneficial or not.

If not, I'll forget it and stick with the conventional mods.

 

I'm not saying I'm the first to mod an intake and yes it has been done by a lot of people to a lot of intakes. All I'm trying to point out is the condition of a factory stock intake for some of those who may have never seen the inside of one before!

 

too much work... I would just go to something like this:

 

Did. Only $200 more than repairing the plenum on the kegger hand a lot more beneficial.

 

True enough, but some of us have to settle for doing the best we can with what we've got, which is more time than money.