Gutted intake manifold
 

Here are some pics for easy reference so you don't have to dig through my 1000 post build thread.

https://www.miataturbo.net/attachmen...ine=1326397131

https://www.miataturbo.net/attachmen...ine=1326397131

Measured plenum volume (without runners) was something like 2.3L. Runner volume was about .5L

Have any pics of before? I've never opened mine up to see whats inside.

how long are the runners now, like 3-4"?

Oh please God tell me you did that while the manifold was still attached to the head. That'd be awesome.

Like glitter from the tailpipe, awesome! ;)

thanks for posting! I'm about to send my motor off to get worked on, ive been bookmarking all porting stuff like this that ive came across

Probably around 6 inches? Car is still quite peppy out of boost. I mean, if you did this to a naturally aspirated car then you might loose what, 5hp down low? Since boost is what makes power FWIW I didn't notice any spool hit when I took off my ungutted mani and put this on.

Of course and like a ------- baller I shoved a pile of magnesium shavings down there to take care of the aluminum chunks-- to smooth out the walls n stuff

did you do all the porting yourself?

Where did the Mg come from?

:hustler:
MGs come from Britain, of course
:bowrofl:

Off my crotchal region


Sean mr 2JZ MX5 did most of the gutting with a mill. shi was then smoothed with some aggressive rotary diamond coated bit thing.

All the EGR and vacuum port crap was welded shut with bannanas

probably way more than that.

Junior high education fail:
https://www.miataturbo.net/attachmen...ine=1326473680

I'm all about the Hg.

I had planned to close up the open ports in my manifold with molten alloy. After reading over this all encompassing thread Im now goin with the bananas method. Less clean up and no gas production.

and high in potassium.

We could all INTAKE more of that.

Thanks for the pics. I need to get reinspired to start gutting my extra manifold. It's such a slow PITA process I doubt I'll ever finish. Anyone have suggestions on what kind of tool to use for this? I've just been randomly picking up different cutting tools and nothing has seemed to work all that well.

Oh hahahdgs roflllooloollol

my plan was to use a air die grinder for the big work, then down to dremel. im not sure what kind of bit is best to use. something for rapid removal for the grinder, then probably something similar on the dremel....to a grinding stone, down to coarse sand paper, then fine sand paper

yeah it was, but I couldn't resist
worth it to yank your insensibilities

heard from Corky this evening,
they are finishing my downpipe
and next week is tuning time

PS - actinides are forever

Very interesting poem.

Yes, by definition actinides are "forever". lolol

I love this forum.

You can cut a lot of the top half with a saws-all. Harbor Freight die grinder. Used carbide bits, the trick with them is to spray WD-40 on both the bit and the piece, to keep the bit clean. I had my top half done in a couple hours.

i did this to my fwd BP vics manifold and didnt notice any change in power with my butt dyno.

After doing this to Faeflora's mani I would suggest anyone else who goes on to do this take some better measurement than I did. If you notice the one huge flat spot in between the two runners it because that is a huge chunk that needs to come out but you can not mill it down as far due to the shape of the mani. Had I known this ahead of time I would have left more material so it could be more pointy when complete. Other than that it is a matter of just hogging the hell out of it until you are happy.

If you guys are interested we do offer porting and polishing of intake manifolds also.