Eventuri Carbon fiber Plenum – Broken inlet trumpet

[a5m]

Originally Posted by RG m3

I sent Eventuri an email this morning asking how the plenum is built and if there are any lock nuts on the screws underneath the epoxy.

I got a prompt response from Bilal and here's what he said:

"The screws are held in place with lock nuts which sit on a carbon flange that is part of the trumpet. Then they use epoxy over the nuts as an added measure."

"Adding the lock nuts was a bit tricky but just about had enough space. Also we are using Aerotight lock nuts which don't come loose under vibrations like the traditional nuts do."

So the velocity stacks are not sandwiched between two pieces but secured to the throttle body adapters via the screws and nuts. If I understand correctly, the bottom of the plenum is what is sandwiched between the velocity stack and the throttle body adapter.

This puts me at ease that the plenum should hold up over time. Infinity Design's S85 plenum and upcoming S65 plenum are built similarly, bolting the throttle body adapters to the velocity stacks to eliminate failures. This is according to what Salman at Infinity told me.

Thanks for reaching out to them and sharing the info. This perfectly explains how it's all put together and definitely puts my mind at ease as well.

Still looking forward to what Infinity brings for a plenum. So many options to choose from now. Partee's looked interesting too but haven't seen much on it.

[Mandersm]

Agree, the latest design looks much better, and safer.
There are less glue on the inside that can fall of in big chunks like it has on mine.




Anyway, I got an amazing email from IND today. Eventuri will ship me a brand new plenum as soon as possible.

[a5m]

Originally Posted by Mandersm

Agree, the latest design looks much better, and safer.
There are less glue on the inside that can fall of in big chunks like it has on mine.




Anyway, I got an amazing email from IND today. Eventuri will ship me a brand new plenum as soon as possible.

That's great news! Glad they're making it right and standing by their product.

[RG m3]

Originally Posted by Mandersm

Agree, the latest design looks much better, and safer.
There are less glue on the inside that can fall of in big chunks like it has on mine.




Anyway, I got an amazing email from IND today. Eventuri will ship me a brand new plenum as soon as possible.

I'm happy for you and good on Eventuri for standing up and doing the right thing. That's what great businesses do.

[RG m3]

Originally Posted by a5m

Thanks for reaching out to them and sharing the info. This perfectly explains how it's all out together and definitely puts my mind at ease as well.

Still looking forward to what Infinity brings for a plenum. So many options to choose from now. Partee's looked interesting too but haven't seen much on it.

My pleasure, we're here to help each other out. Yeah, I'm curious to see what Infinity comes up with. Haven't heard of Partee though, maybe I missed it.

[Mandersm]

I will probably swich over to Motorsport24 clubsport plenum next year. (Or migh go crazy with the race plenum).

I installed the lower Motorsport24 bumper intake last week. But want the rest of the airbox and plenum.

The car has become a pure Clubsport/track car. So the Eventuri is to showcar for me now.

[a5m]

Originally Posted by Mandersm

I will probably swich over to Motorsport24 clubsport plenum next year. (Or migh go crazy with the race plenum).

I installed the lower Motorsport24 bumper intake last week. But want the rest of the airbox and plenum.

The car has become a pure Clubsport/track car. So the Eventuri is to showcar for me now.

Wow thanks for sharing, how much does that run? I've come across their stuff before and it looks super hardcore. This would probably be mainly aesthetics but looks like they smoothed out the flow which would actually give some gains similar to Eventuri's bumper scoop. Maybe a bit more.

I wonder what claims they make, will have to look this up.

[RG m3]

Originally Posted by Mandersm

I will probably swich over to Motorsport24 clubsport plenum next year. (Or migh go crazy with the race plenum).

I installed the lower Motorsport24 bumper intake last week. But want the rest of the airbox and plenum.

The car has become a pure Clubsport/track car. So the Eventuri is to showcar for me now.

That's the great thing with this platform, there are so many options out there, no matter what you want to do you can do.

[Mandersm]

I installed a DO88 DCT oil cooler and basically bought the M24 duct because of the carbon fiber look. But I see that the OEM duct is a lot smaler inside, so I hope it actually makes a difference in air flow as well.

The M24 duct is 462€


https://motorsport24.shop/BMW-M3-E92-Luftfuehrung-links

[Mandersm]

With the full M24 Clubsport plenum they claim a 25 hp increase, But only with their own tune.

[a5m]

Originally Posted by Mandersm

I installed a DO88 DCT oil cooler and basically bought the M24 duct because of the carbon fiber look. But I see that the OEM duct is a lot smaler inside, so I hope it actually makes a difference in air flow as well.

The M24 duct is 462€


https://motorsport24.shop/BMW-M3-E92-Luftfuehrung-links

Originally Posted by Mandersm

With the full M24 Clubsport plenum they claim a 25 hp increase, But only with their own tune.

That's an impressive bump from just a plenum and tune. Are you planning on getting it? Wish they had more details on the design and how that gain is achieved.

Thanks for the link to the duct, I reached out to them on Whatsapp. It's definitely larger and smooths out the sharp bends. The Eventuri scoop is like $250 if purchased separately, and is stuck on. I rather go for this and replace the whole thing and have carbon from the bumper to the throttle bodies. I'll see if they make the grill ducts too.

[Mandersm]

Originally Posted by a5m

That's an impressive bump from just a plenum and tune. Are you planning on getting it? Wish they had more details on the design and how that gain is achieved.

Thanks for the link to the duct, I reached out to them on Whatsapp. It's definitely larger and smooths out the sharp bends. The Eventuri scoop is like $250 if purchased separately, and is stuck on. I rather go for this and replace the whole thing and have carbon from the bumper to the throttle bodies. I'll see if they make the grill ducts too.

Yes, I`m planning to get the complete M24 Airbox. But as I would need a custom MAP from them I want to do it at the same time as I install new camshafts. So this project will happen hopefully next winter.


I will really look into the possibility of getting the Race Airbox, But this would need a new horizontal radiator, removal of AC, and electric servo pump. (M24 have all parts and kits for this)

Would be a crazy build, but absolutely doable for a Street/Track Club Sport build.

If not the Race Box I will definitely get the Clubsport plenum, that’s no problem to install, and get new software for.

[bigjae1976]

Originally Posted by a5m

Not what I expected... Serial # 1414

Imran@Evolve

Looks like the screws are going into a glob of epoxy? I can take better pictures if you guys want to see something in particular, but I didn't see any metal collars or anything inside.

What was the expectation on fixing this? I don't see an issue using screws and epoxy.

I'm sure the challenge is it is tricky to get a good bond in that area. Difficult to clamp down. Can't fault them for trying to stay away from metal on a carbon part. Because if it did have aluminum people would be bitching that it's not all carbon.

Not an evolve fan by any means but those expecting them to fix aftermarket parts...sorry...that's the risk of using aftermarket parts. Especially 3-4 year old aftermarket parts. But...Evolve should want to maintain their reputation and take care of it. But...these cars are old and will get a lot more of the eBay racing crowd so Evolve might think this is a group they are willing to piss off.

Just some thoughts...

[RG m3]

Originally Posted by bigjae1976

What was the expectation on fixing this? I don't see an issue using screws and epoxy.

I'm sure the challenge is it is tricky to get a good bond in that area. Difficult to clamp down. Can't fault them for trying to stay away from metal on a carbon part. Because if it did have aluminum people would be bitching that it's not all carbon.

Not an evolve fan by any means but those expecting them to fix aftermarket parts...sorry...that's the risk of using aftermarket parts. Especially 3-4 year old aftermarket parts. But...Evolve should want to maintain their reputation and take care of it. But...these cars are old and will get a lot more of the eBay racing crowd so Evolve might think this is a group they are willing to piss off.

Just some thoughts...

There is a vibration resistant lock nut underneath the epoxy that holds the screw and velocity stack in place. Seems like they did learn from their original design which experienced failures in this area when it was only secured with epoxy.

I own their new updated plenum and I hope it holds up over time. For the price they charge for these, we should expect them to replace defective units as this should not be a wear item. From what I read so far, it seems Eventuri treats their customers very well and replace old defective units, as they should. Having a part as expensive as this last only 3-4 years is not acceptable, aftermarket or not. It should last the life of the car.

With this platform getting older and more accessible, we might get more of the racing crowd as you say, but I still believe Eventuri wants to have a premium image and they will do what's necessary to maintain that.

[GORDON.M3]

I've inspected mine, sent photos to Eventuri and they had mentioned that the epoxy in mine seem to not have any issues. I've had mine for the past 10k now, so I think it's safe to say its an isolated issue? Otherwise, ALL the older plenums would have seen similar failure now?

[RG m3]

Originally Posted by GORDON.M3

I've inspected mine, sent photos to Eventuri and they had mentioned that the epoxy in mine seem to not have any issues. I've had mine for the past 10k now, so I think it's safe to say its an isolated issue? Otherwise, ALL the older plenums would have seen similar failure now?

Since these are built by hand, there can be some production variations from one to the other. I guess not all older plenums are affected, but we don't know how many or what percentage have seen failures and we never will. The fact that they updated the design of their plenum suggests that the failure rate was unacceptably high, or else they wouldn't have bothered.

I would continue to keep an eye on it. If something were to go wrong, I'm sure Eventuri would step up and make it right. That being said, I really hope no future issues arise with yours and I'm happy to hear it's ok.

[M3SQRD]

Originally Posted by a5m

Not what I expected... Serial # 1414


Looks like the screws are going into a glob of epoxy? I can take better pictures if you guys want to see something in particular, but I didn't see any metal collars or anything inside.

I can’t see how they would’ve installed a nut plate or even added a nut to the design. However, it’s pretty obvious from the pictures that no nut was added and, if one was added, how did they get an open ended or closed end wrench onto all three nuts? The fastener preload is reacted by the now original threaded blob of adhesive? This will eventually destroy the blob of now threaded cured epoxy. Did they clean up the exterior CF mounting surfaces where the bolted aluminum rings sit on the CF surface?? With the new larger external diameter three-bolt mounting flange, is this aluminum flange also bonded to the external CF mounting surface? It doesn’t look like these two surfaces are bonded together.

Is the inside of your CF plenum coated with dust/dirt?

It would have been easy to structurally analyze the plenum under static and dynamic loading environments. The dynamic loading environments are easily derived except for the random environment due to the engine vibrating on its engine mounts and the hood direct and reverberated acoustic loading environments. The engine random environment could be measured by accelerometers mounted on the engine by ITBs. It’s the hood direct and reverberated acoustic loading environments that are harder to define. However, I’d bet all of the CF plenum manufacturers did absolutely no structural assessments of their CF plenums.

[a5m]

Originally Posted by M3SQRD

Is the inside of your CF plenum coated with dust/dirt?

This is a brand new plenum I've yet to install. Assumed the dusty appearance is how raw pre-preg carbon looks like.

I also don't understand how they tighten hardware inside these plenums.

[M3SQRD]

Originally Posted by a5m

This is a brand new plenum I've yet to install. Assumed the dusty appearance is how raw pre-preg carbon looks like.

I also don't understand how they tighten hardware inside these plenums.

Having used pre-preg materials since 1990, I can tell you that parts manufactured using pre-preg does not look like that. Other CF plenums made using pre-preg woven fabric doesn’t look like the inside of the Eventuri CF plenum.

[paulh@evolve]

Originally Posted by bigjae1976

What was the expectation on fixing this? I don't see an issue using screws and epoxy.

I'm sure the challenge is it is tricky to get a good bond in that area. Difficult to clamp down. Can't fault them for trying to stay away from metal on a carbon part. Because if it did have aluminum people would be bitching that it's not all carbon.

Not an evolve fan by any means but those expecting them to fix aftermarket parts...sorry...that's the risk of using aftermarket parts. Especially 3-4 year old aftermarket parts. But...Evolve should want to maintain their reputation and take care of it. But...these cars are old and will get a lot more of the eBay racing crowd so Evolve might think this is a group they are willing to piss off.

Just some thoughts...

Just to clarify, Evolve are a different company to Eventuri

[RG m3]

Originally Posted by M3SQRD

I can’t see how they would’ve installed a nut plate or even added a nut to the design. However, it’s pretty obvious from the pictures that no nut was added and, if one was added, how did they get an open ended or closed end wrench onto all three nuts? The fastener preload is reacted by the now original threaded blob of adhesive? This will eventually destroy the blob of now threaded cured epoxy. Did they clean up the exterior CF mounting surfaces where the bolted aluminum rings sit on the CF surface?? With the new larger external diameter three-bolt mounting flange, is this aluminum flange also bonded to the external CF mounting surface? It doesn’t look like these two surfaces are bonded together.

Is the inside of your CF plenum coated with dust/dirt?

It would have been easy to structurally analyze the plenum under static and dynamic loading environments. The dynamic loading environments are easily derived except for the random environment due to the engine vibrating on its engine mounts and the hood direct and reverberated acoustic loading environments. The engine random environment could be measured by accelerometers mounted on the engine by ITBs. It’s the hood direct and reverberated acoustic loading environments that are harder to define. However, I’d bet all of the CF plenum manufacturers did absolutely no structural assessments of their CF plenums.

Regarding the nuts, this is what Bilal from Eventuri told me when I asked if there were any:

"The screws are held in place with lock nuts which sit on a carbon flange that is part of the trumpet. Then they use epoxy over the nuts as an added measure."

"Adding the lock nuts was a bit tricky but just about had enough space. Also we are using Aerotight lock nuts which don't come loose under vibrations like the traditional nuts do."

Also, a5m posted some pictures in this thread of the interior of the updated plenum and it looks dusty/raw, just like mine. If you run your fingers inside, you don't pick up anything, it's not dusty, it just looks that way.

I'm not sure if the flange is bonded to the cf, I would have to ask Eventuri to get an answer. It's hard to tell by looking at it.

Maybe the cf plenum manufacturers do some structural assessments with computer programs, who knows, but extensive testing would be costly I imagine.

[RG m3]

Originally Posted by a5m

This is a brand new plenum I've yet to install. Assumed the dusty appearance is how raw pre-preg carbon looks like.

I also don't understand how they tighten hardware inside these plenums.

I have seen pictures of the old Eventuri plenum without the top, showing the base with the internals. My guess is they install the trumpets in the base and then add the lid and fuse it with the base somehow.

It's the only way I can see they would have access to tighten the nuts and make sure everything is good.