Expansion Chamber Project

Discussion in 'Motorized Bicycle General Discussion' started by Derks420, Aug 10, 2010.

  1. Derks420

    Derks420 New Member

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    Hey guys, Just finished everything up, couple bolts to go, but done. The only mods I had to do was lengthen the head pipe from 9 to 12 inches. Here are a couple of pics
     

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  2. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Sweetly Sick Bike Man.

    Nice!

    What did you paint the silicone hose with?
     
  3. Derks420

    Derks420 New Member

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    Thanks! Worked really hard on almost everything on it. But thats what makes it fun, 1 of a kind!

    I actually went to Lowe's and got some Black replacement silicone tubing. Um... It was 1 inch inner diameter and 1 1/4 outer. $2.58 a foot, and that's more than you need!

    I couldn't stand the blue stuff that came with the kit, did not match anything on the bike. I considered painting it but that would have looked rough...
     
  4. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    The black may work - silicone for that low price? Wow! We get ours from an industrial supplier and it's dang expensive. Blue is the second highest temperature rating. Red is the top.

    Two warnings, 1/8" wall and black is usually the lowest temp rated material. Just watch it.
     
  5. Derks420

    Derks420 New Member

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    Thanks for the heads up. You think It will work alright? If not, ill search tomorrow for some better grade stuff
     
  6. Pablo

    Pablo Master Bike Builder & Forum Sponsor

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    Give it run - just watch it and let us know how it holds up.
     
  7. huckersteve

    huckersteve New Member

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    Yeah I tried some gates heater hose the other day for a black header seal since my blue ones from the SBP pipe finally gave out after over a year of use. Long story short- the black rubber didn't last 20 miles before it was a gooey melting smoking mess. I ripped it off at a stoplight and threw it away..
     
  8. Derks420

    Derks420 New Member

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    Crap, well I went out today and looked for some, and I couldnt find any around here!! Im goin on vacation this sat and i need to have this runnin!
     
  9. sajoe

    sajoe New Member

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    I welded mine and have not regretted it one bit.
     

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  10. Derks420

    Derks420 New Member

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    Well I will eventually weld it. I went to a local auto parts store and got some heater hose to replace the crap from lowes, and it works great!
     
  11. Whizzerd

    Whizzerd New Member

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    Very impressive build!
     
  12. huckersteve

    huckersteve New Member

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    I love that pickup truck bike too! Nice builds boys
     
  13. taddthewadd

    taddthewadd New Member

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    Have you run the heater hose yet? just curious how it holds up.
     
  14. Derks420

    Derks420 New Member

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    Thanks for the compliments guys!

    Yea I ran It for a while today and the hose held up great! pipe was smokin hot, but the hose was just fine.

    I Actually also got a 36 tooth sprocket when i ordered the sbp chamber, and installed it at the same time. With my old 44 tooth and stock muffler, i was toppin 33 mph, now with the chamber and sprocket, im hittin 37. SOOOO close to the 40 mark!

    The only thing that I really dont like is how much i need to pedal while idleing now before dropping the clutch, and the motor still struggles to start to pull at first. Once past that, its fast! So what do you guys think I should do?

    Either leave my 36 tooth on there and pedal alot more at first. (which i freakin hate, especially if you stop on a hill) OR Put my 44 tooth back on and be happy with 33mph?
     
  15. Derks420

    Derks420 New Member

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    Or do u think i should try and "tune" the headpipe length? an see if that improves initial acceleration?
     
  16. taddthewadd

    taddthewadd New Member

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    No matter how much you tune the head pipe length you are still going to have to pedal a lot. I have a sbp chamber and a 38T and still have that problem and I weigh 170. I went back to 44 because it accelerates way better and it is plenty fast for me.

    BTW will you tell us exactly what size of hose and what kind and where you bought it?
     
  17. Derks420

    Derks420 New Member

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    Damn, thats what i was afraid of. Well ill change mine back tomorrow, and hopefully have it runnin good.

    I went to a local auto store, Hapi Auto, and asked for 1 inch Inner diameter heater hose. I think that it is also called converter hose. Its black with a smooth inside and kinda....rough outside(not bumpy but the rubber gets all over your fingers and stuff) Got a foot long piece for 2 bucks

    Ill try n post a picture of the hose close up so you can see it tomorrow.
     
  18. ferball

    ferball New Member

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    Converter hose is different than heater hose. Converter hose is for air intake on cat converters and will hold up to temp and oil. Heater hose my stand the heat, but the oil will destroy it. Converter hose is the cheapest High temp hose I have found for exhaust.
     
  19. Derks420

    Derks420 New Member

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    Then its converter hose because i told him what it was for and that it need to hold up to high temps up to around 350, and thats what he brought me.

    Thanks for the Help!!
     

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