(mods, I'm not sure if this should be placed here or in the showroom section. just move this if you have to smile.gif )

I have finally raised enough money for a new intake manifold. It will serve as a housing for my secondary injectors as well. It will be made of aluminum with aluminum runners and velocity stacks inside. All welds will be made with a TIG welding machine. If time (and of course, money) permits I hope to have it anodized as well. Primary injectors will be stock ones while secondary injectors will be 440cc RC Engineering injectors. Hopefully I'll hit 330++ whp safely. lilboy.gif


Here are some pictures of the progress:

(Just spot welded the runners to the flange)





and inside the manifold:



Things to be done next are:

- custom aluminum fuel rail (for 2nd set of injectors)

Gods of horsepower, I pray to you!!!! Please help me achive 330++ whp!!!!! hail.gif

 

with the stacks inside dosent that cause a flow issue with them sticking out in the plenum area?? i would guess that would cause some sort of flow issue with air that isnt pushed in them.

 

Thats actually how it should be I think. Everyone has different opinions on it but many Ive seen are like that.

 

Sharp lookin engine man, keep up the good work.

 

that's what I have been thinking about this whole time. but, I just copied one of the Magnus and VP intake manifold designs. I guess it would not be much of a problem when an engine has forced induction.

 

looks good. i'd be concerned about the sticking out too just because of air flow. that's some hard work.

 

READ. CORKY. BELL. NOW. EVERYONE.

He shows the exact way to do velocity stacks and the intersection of runners into the plenum.
Velocity stacks: the radius of the curve of the velocity stack should be the exact same as the radius of the runner. Nothing more complicated than that. They don't need to round down (like you have yours), and I'd say yours have to be about 3x as big as they are now to get most ideal. That being said, he said a perfectly machined velocity stack only barely increases the flow of the intake overagainst one without a stack.
Intersection: the runners are supposed to go through the plenum like that. I don't think there's an exact measurement, but I would probably go for about one radius, give or take a little, from the top of the runner to the intersecting edge of the runner and plenum. This allows the runner to draw air from essentially 360 degrees instead of 180 (you get a portion of air below the velocity stack as well rather than just on top and next to the stack. Not sure how to explain this better without drawing a picture...) The air flow really doesn't help any, you just need even pressure all around and more possible areas for the runners to draw from.

 

I am aware of this 'air-flow' problem in the runner's postion inside the plenum and the velocity stack's true purpose. However, I have my reasons why it turned out this way.

1.) Flushing the runner completely against the plenum is very hard work but more importantly, more expensive. I'm just a college student and every single dollar counts in my situation. And just to make it clear, the area where the stack is not flushed against the plenum, that's because the runner is not yet welded into the plenum. And since the runners are angled, the plenum moves about. But even after everything else is done, it won't be 100% flushed like AMS' intake manifold.

2.) The curling of the tips of the runners was just experimental on my friend's machine, hence the imperfections on the velocity stack. And it's FREE yeah.gif I also did not want it to be that big (the velocity stack), as fitting it inside the plenum can be quite an issue. I didn't want the plenum to be split in half just to fit the runners. That can be a source of leaks too. Plus, tungsten and argon are expensive you know lmao.gif

 

sorry I havent been able to update this thread for a long time now... I've been sidetracked by so many things lately, and a new project car with father. Anyway, I've yet to test my car on the dyno but with street tuning at 1.2 bar, I waved goodbye to lean mixtures! nana.gif engine revs smoothly but accelerates quite brutish now. I'm guessing this is in the area of 290whp to 300whp max. For two months now this has been the case and I'm very happy with it.

I found these old pics on my old memory card and just thought of posting them here. these pictures were taken on the day the manifold got finished, and yet to be polished/buffed. and stupid me, I can't find any pics of the polished manifold. I think I deleted them.... 02.gif









I'll be taking pictures again of the finished engine bay when I find the time smile.gif

 

maybe this is a dumb question, but what are the big ports on the top of the IM for? never seen anything like em..