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01-14-2021, 06:25 AM | #81 |
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Join Date: Jun 2014
Location: Land of Lincoln
Posts: 3,127
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Re: Newbie '29 Speedster project, the good the bad and even the ugly (maybe)
Thanks for posting! Looking good! I would love to hear the exhaust note!
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Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done |
01-14-2021, 08:27 AM | #82 |
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Join Date: May 2010
Location: Liberty, KY
Posts: 899
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Re: Newbie '29 Speedster project, the good the bad and even the ugly (maybe)
Outstanding Work!!
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01-14-2021, 11:02 AM | #83 |
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Join Date: Nov 2013
Location: Ahwatukee, AZ
Posts: 115
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Re: Newbie '29 Speedster project, the good the bad and even the ugly (maybe)
Love the dash! Great work. Creativity is #1 in my book.
Stupid question time: Are the exhaust pipes all the same length? I think that I read somewhere years ago that racers build them that way. Is that true? Ned
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Retired civil engineer. Winters in Phoenix, summers in Ipswich, Mass. and North Dakota. '29 closed cab pickup- Excellent AZ truck. '29 roadster- Owned for 21 years but now sold. '28 CC pickup- My first car in Andover, MA back in '62- '63. |
01-14-2021, 08:41 PM | #84 | |
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Join Date: Aug 2019
Location: Hagerstown MD
Posts: 224
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Re: Newbie '29 Speedster project, the good the bad and even the ugly (maybe)
Quote:
Thanks Yes, the goal is to have the exhaust pulses exit the header primary pipe in equal impulses so I tried to keep the pipes the same length. Having too tight of a curve causes problems with the flow though. If the pulses are out of sync the pipe loses efficiency. Using the firing order 1-2-4-3 I paired 1-4 and 2-3 so the impulses will be evenly spaced out. Then both pairs go through the X crossover to feed both pairs of exhaust pipes. I wanted small pipe diameter so I had plenty of velocity which should help draw out the exhaust from the paired cylinders as the high speed exhaust pulse goes past the inactive pipe. There's a lot of science, some thermodynamics and even some math involved to get close.
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Building a '29 Speedster, the hard way... |
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05-01-2021, 08:09 PM | #85 |
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Join Date: Aug 2019
Location: Hagerstown MD
Posts: 224
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Re: Newbie '29 Speedster project, the good the bad and even the ugly (maybe)
Somewhat delayed update. Been working on the skins to finish the body. Made a tail cap, the other side panel and have been working on the shoulder skins now. Funny that it's finally getting easier to manipulate the metal. There's also a '23 Model T that showed up waiting for it's chance to become a speedster.
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Building a '29 Speedster, the hard way... |
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