The Freakiest -7" Build You Ever Done Seen.
- Thread starter BrightE's
- Start date
BrightE's
Paul
- Location
- Seattle, WA
That's my understanding too. This is making me a bit worried! I might change up my plans and check into a rolled aluminum tube for the exhaust. I really don't want to have to crack into the tray again after I seal it up.
Though what makes me question it is those RRP carbon exhaust chambers. You would think they would break down in a season with the kinds of heats you see right outside of the exhaust manifold.
Thoughts?
BrightE's
Paul
- Location
- Seattle, WA
Don have you ever seen these deteriorate over a few seasons?
I figured those and the carbon fp chambers were all post cured and might even use high temp resin.
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l'm not aware of any carbon tubes,but there are a bunch out there.My tube is 3 12 oz sleeves,so l'm gonna stick my neck out here and say l don't believe l will have a problem.l just didn't want an aluminum tube knowing it will eventually corrode.
Be sure to pressure test it with around 35 lbs.
hornedogg79
dodgin' bass boats
He has never kept a ski more than a season!
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- Location
- South Florida
I made sure to wrap my custom welded aluminum exhaust with a layer of fiberglass everywhere it was going to touch carbon to avoid that issue.
Another option is to coat the aluminum tubes with zinc chromate.
An interesting abstract on the topic:
Title : Contact Corrosion Between Carbon Fiber Reinforced Composite Materials and High-Strength Metals,
Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
Abstract : Experimental results show that when carbon fiber/epoxy resin composite materials are joined with high-strength titanium alloys, aluminum alloys, lCrl8Ni9Ti stainless steel, or other structural materials, galvanic corrosion and crevice corrosion take place on the contact boundaries. This corrosion is primarily determined by the electrochemical properties of the materials. It is also related to the materials' mutual coupling situation, treatment technology, and environmental conditions. Galvanic corrosion is affected by the coupled materials' static energy of corrosion (Ecorr), galvanic currents, and other dynamic closed-circuit properties. In a 3.5% NaCl solution, materials' electrochemical properties and treatment techniques tended to have similar effects on galvanic corrosion and crevice corrosion. When soaking weight loss methods, salt spray methods, and crevice corrosion methods were used to test couples of CFRM with anodized titanium alloys or couples of CFRM with hot water-sealed or chromate-sealed aluminum alloys, the materials were proved to be stable and satisfactory for the needs of engineering applications. (MM)
An interesting abstract on the topic:
Title : Contact Corrosion Between Carbon Fiber Reinforced Composite Materials and High-Strength Metals,
Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
Abstract : Experimental results show that when carbon fiber/epoxy resin composite materials are joined with high-strength titanium alloys, aluminum alloys, lCrl8Ni9Ti stainless steel, or other structural materials, galvanic corrosion and crevice corrosion take place on the contact boundaries. This corrosion is primarily determined by the electrochemical properties of the materials. It is also related to the materials' mutual coupling situation, treatment technology, and environmental conditions. Galvanic corrosion is affected by the coupled materials' static energy of corrosion (Ecorr), galvanic currents, and other dynamic closed-circuit properties. In a 3.5% NaCl solution, materials' electrochemical properties and treatment techniques tended to have similar effects on galvanic corrosion and crevice corrosion. When soaking weight loss methods, salt spray methods, and crevice corrosion methods were used to test couples of CFRM with anodized titanium alloys or couples of CFRM with hot water-sealed or chromate-sealed aluminum alloys, the materials were proved to be stable and satisfactory for the needs of engineering applications. (MM)
BrightE's
Paul
- Location
- Seattle, WA
Shane what gauge or wall thickness did you use for your aluminum exhaust? You have any pictures of the final unit before you installed it?
BrightE's
Paul
- Location
- Seattle, WA
I saw that shop - I think that's where I got my cooling tubes from actually, but now looking around they're a bit pricey. I might see if this place can get me what I need. It looks like they sell mandrel bend elbows as is, so I could pick up stuff without having to have a shop bend anything, then just get it welded.
http://www.acceltube.com/mm5/merchant.mvc?Screen=CTGY&Store_Code=acceltube&Category_Code=ALM45
http://www.acceltube.com/mm5/merchant.mvc?Screen=CTGY&Store_Code=acceltube&Category_Code=ALM45
Note to self, cover any engine bay mounts with a few layers of glass before putting any carbon down. Also I like the idea of anodizing the aluminum cooling tubes!
- Location
- South Florida
BrightE's
Paul
- Location
- Seattle, WA
No that's OK, that's a big help. Is that 3" OD?
- Location
- South Florida
2.5
- Location
- Houston, TX
3D printing ski parts... I like where this is going. Looking good.
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BrightE's
Paul
- Location
- Seattle, WA
Did a little bit of clearance control to help the deck halves nest a little closer without inducing too much stress when clamped and bonded.
I also got the motor mounts done up. Laid 5.7oz carbon over 2 layers of s-glass to keep the carbon from contacting the aluminum in the mounts. This is about the extent of the use of books that my apartment sees.
I also got the motor mounts done up. Laid 5.7oz carbon over 2 layers of s-glass to keep the carbon from contacting the aluminum in the mounts. This is about the extent of the use of books that my apartment sees.
Ducky
Back in the game!
- Location
- Charlotte, NC
Nice work man! This thread and the thread with the guys putting together the Brawler kits really really kick as*!!!
- Location
- clark lake, MI
So do you have to put glass on under the mounts also, or is the glue enough barrier? Great job on the build!
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BrightE's
Paul
- Location
- Seattle, WA
hey, cheers. I imagine you could probably get away with laying down a thin layer of epoxy on top of the mounts, then sanding it flat, then laying carbon over, but I think one chemical bond is probably stronger than two mechanical bonds. S-glass is really thin too so it didn't add too much weight or bulk.