All "IMS failures" are not IMS failures! Carnage within! - Page 2 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

dmcutter · 01-12-2009, 05:02 PM

Jake, I don't think they use gavels all that much in suits, but maybe Lovebunny can weigh in on that one.

blue2000s · 01-13-2009, 07:21 AM

I don't like the idea that the guide is a wear item. They should be rollers instead. I built the attached in CAD. More rollers are better but this conveys the idea. If you want, I can help you develop the part with CAD and finite element analysis. Send me a PM.

MikenOH · 01-13-2009, 10:21 AM

Did one of the 3.2L tensioners survive the damage intact? If so, could you post a picture of the 2 side by side.

Is it fair to say the "newer" design is less robust than the old 2.5L design? If so, what would you guess the cost of material saved might be between the 2 parts?

Thanks

Jake Raby · 01-13-2009, 03:21 PM

Quote:

Originally Posted by blue2000s

I don't like the idea that the guide is a wear item. They should be rollers instead. I built the attached in CAD. More rollers are better but this conveys the idea. If you want, I can help you develop the part with CAD and finite element analysis. Send me a PM.

This design also has some issues as the roller axles are a failure point and the contact patch of the rollers would result in point loading. The drive chain is also a very hard composition that would create some challenges in metallurgy development and heat treat of the rollers, it would be easy to create more issues with chain wear with an arrangement like this. I do appreciate the concept and your input.

We do solid modeling and FE analysis in house along with LN Engineering on all the update components, but I do appreciate your willingness to assist us with the design of the updated component.

blue2000s · 01-13-2009, 07:15 PM

Quote:

Originally Posted by Jake Raby

This design also has some issues as the roller axles are a failure point and the contact patch of the rollers would result in point loading. The drive chain is also a very hard composition that would create some challenges in metallurgy development and heat treat of the rollers, it would be easy to create more issues with chain wear with an arrangement like this. I do appreciate the concept and your input.

We do solid modeling and FE analysis in house along with LN Engineering on all the update components, but I do appreciate your willingness to assist us with the design of the updated component.

Very simple, add shallow teeth to the rollers and they turn with the chain. Like I said, it's just for the concept. Point loading is what a bearing is made for. This is a very simple problem to fix.

catmanluge · 01-13-2009, 10:35 AM

Now we have another weakness to worry about! This may just be a rare failure I hope!

catmanluge · 10-22-2009, 02:09 AM

Jake

Is it possible that the plastic button let go first and then the ware of the guide increased?

Jake Raby · 10-22-2009, 08:48 AM

Quote:

Originally Posted by catmanluge

Jake

Is it possible that the plastic button let go first and then the ware of the guide increased?

That is exactly what happened.

I am working on an extraction procedure for the plastic wear component that can be replaced in the car, engine assembled. LN and I already have the metal wear surface made that can replace it as a retrofit.

clickman · 10-23-2009, 09:16 PM

Quote:

Originally Posted by Jake Raby

I am working on an extraction procedure for the plastic wear component that can be replaced in the car, engine assembled. LN and I already have the metal wear surface made that can replace it as a retrofit.

I can't wait to see this piece of magic