Xcessive Manufacturing 20B Lower Intake Manifold (LIM)
 

Just thought I'd share what Xcessive has been working on as of late.

Full length version:

Quote from Xcessive's website:

Xcessive's all new cast lower intake manifold for the 20B is based on the same concept as our original 13B-REW manifold, better runner flow balance, more volume and more fuel. We've made these manifolds with 6 injector bosses machined to fit Bosch type top feed injectors with 14mm o-rings without any adapters. We've placed all the injectors on the inside of the manifold to keep them away from heat leaving more room on the outside for turbo motors as well as a cleaner install.

The new lower manifold fits stock upper castings and comes in both a full height (stock) and short versions. This is the FULL HEIGHT (stock) version. They are also available with and without fuel rails. This manifold kit includes the fuel rail assembly. The fuel rail has 3/8" NPT ports on both ends with a -8 (1/2", 13mm) through hole and comes with the apropriate stand off's for full height top feed injectors. No more welding bosses onto a stock manifold and chopping and welding the upper flange, we've done it all for you in a single brand new piece that'll also out flow a stock manifold.

This Kit Includes

New cast manifold - Full height (stock) version

6 port fuel rail for top feed injectors

Rail stand off brackets and bolting hardware

Front mounting bolt (New boss height)

it is currently available for purchase, but I'm not a vendor, so I thought "d just share the information that it has been built

There is also a short version for easier swapping into non JC cosmo chassis'

Short version:

Quote from Xcessive's website:

Xcessive's all new cast lower intake manifold for the 20B is based on the same concept as our original 13B-REW manifold, better runner flow balance, more volume and more fuel. We've made these manifolds with 6 injector bosses machined to fit Bosch type top feed injectors with 14mm o-rings without any adapters. We've placed all the injectors on the inside of the manifold to keep them away from heat leaving more room on the outside for turbo motors as well as a cleaner install.

The new lower manifold fits stock upper castings and comes in both a full height (stock) and short versions. This is the short version that is 1 1/2" (38mm) shorter than stock. They are also available with and without fuel rails. This manifold kit includes the fuel rail assembly. The fuel rail has 3/8" NPT ports on both ends with a -8 (1/2", 13mm) through hole and comes with the apropriate stand off's for full height top feed injectors. No more welding bosses onto a stock manifold and chopping and welding the upper flange, we've done it all for you in a single brand new piece that'll also out flow a stock manifold.

This Kit Includes

New cast manifold - Shortened version

6 port fuel rail for top feed injectors

Rail stand off brackets and bolting hardware

Front mounting bolt (New boss height)


Again; I'm not a vendor, just sharing the good news.

Additional pictures of the short version Lower Intake Manifold (LIM)
 

Here you go!

Amazing.... I was wondering when an Xcessive LIM would come to the 20B (not like i have one though)

Giggity!!!

now if we can get them to just make a manifold that bolts to the stock upper intake manifold like this, but allows for semi peripheral ports. Although this makes using additional inejctors much easier. or just delete the primary rail and just use one fuel rail. good price too at just over a grand.

Herblenny has had one on his 20b for months now

Herblenny is special, and received a sponsorship. This is the first chance that the rest of us have been able to purchase them. ;)

I wonder why they used the FD intake runner height at the engine mating flange? The 20b has about 1/2" taller opeing., you can see it in their comparison pic.

https://www.rx7club.com/attachments/...b-lim-fhk4-jpg

Banzai - I think it may have been for hood clearance, if you are using the stock subframe you run into issues with the hood resting on the UIM and you either have to lower the engine or shorten the LIM.

Blackadde/// - you are so correct :D

Hood clearance has nothing to do with the size of the intake port on the side of the engine at the bottom of the intake manifold. Compare an FD LIM gasket to a 20B and you see what I am talking about.

oh my bad i miss read what your post was asking, i thought you were talking about the height of the LIM itself

Here is a pic

https://www.rx7club.com/attachment.p...1&d=1347631601

can I skip the primary rail to simplify fuel system? (or do I need to buy 3 more injectors?)

btw, that flange surface looks pretty rough. how's the finish for those who already has this manifold?

Looks like you have to port down to full 20b spec on the xcessive manifold no?

Look like a bit of porting will do. But its nice that they sure used there head,went ahead and made the lower intake option... Relay nice

Definitely a legit piece :icon_tup:

Interesting on the runner height, sharp eyes from Banzai. Wonder why they did that? Would rather not have to open all those up with the carbide bit in the event I wanted to use one of these.....

I asked them about the runner height and they said that was from the initial test manifold. They said its been corrected in the production run.

thewird

I asked them a well, here is the response:

The manifolds in the pictures were our first articles that we now use around the shop as mock up, we have corrected the port shape. We didn't go with the more involved shell core tooling for the runners that we use on our 13B manifold on the 20B, it was getting expensive enough. The no bake type cores we use on the 20B do come out good, but great would have been a large step up in cost. I always recommend customers check the port match if they're looking for maximum power and benefit. If port matching/clean up isn't something you're set up to do, we can do it for you. We feel it can get bit tricky if we gasket match the ports here and your ports are different though. I have no doubt our manifolds straight off the shelf will be of benefit to you, but if you want to shoot us a port template, I'll be happy to work on the ports before the manifold leaves here.

not a bad deal sounds like they have some good customer service too. Like stickmantijuana said it would be nice to have this just for the purpose of losing the primary rail . 6 id2000 injectors could make for some really good power and a lot less complicated fuel system and having all 6 located higher in the manifold might help with better atomization then haing the primaries located right in the intake ports.

Where was this a couple decades ago lol. I will be picking one up

Checked availability and found that they are both in stock, but that only the short manifold has the corrected runner size. The full height manifolds need to be corrected.

They're in stock. I checked our inventory of full height and short manifolds to confirm the port shapes and realized the last run of manifolds was the short version which have the corrected runners. The run of full height version manifolds was done a while back and I'll need to port them out as the correction didn't get in place before we made that first production run.
I'm glad this was brought up, I had forgotten about the timeline of events and would have missed correcting that on the first run full height manifolds.

Don't see too many people casting clean manifolds with extra injector bungs and less emissions crap. They're doing nice work!

These guys do a LIM, rotaryworks does a throttle body and elbow, does anyone do a bolt-on UIM?

I wish someone would build an upper intake manifold with the style similar to beautiful factory unit but one setup for standard ports and one for semi peripheral ports.