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Post by splischke on Oct 22, 2011 19:59:45 GMT -5
oahupilot,
Have you moved back to the mainland or are you still on the island? I vaguely remember you once mentioned moving back.
-Scott
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Post by n3480h on Oct 22, 2011 20:59:50 GMT -5
Thanks for the pic of the new baffles, Scott. I like things that make sense, and these do. Are they .025 T-3? I cleaned up the significant casting flash on one head today. Not to the extent shown in your first pics, so no welding needed. I used a twelve inch long 1/8" drill bit and a chainsaw file. Got quite a bit of filings and one pebble. Airflow will be at least 50% better through this head. I spent about an hour on the head, but the other head is worse and will require a bit more time. If I recall correctly, Oahupilot is now in North Dakota. That's got to be a real culture shock - brrrr. Tom
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Post by oahupilot on Oct 23, 2011 2:20:16 GMT -5
Yup I am back on the mainland and not really happy about it, hopefully I will move either to california, hawaii, or miami in about 2 years. Out of those 3 Hawaii is my top pick, hopefully once I get my phd I can go teach at UH on any of the islands. Although I am partial to the big island or kuai.
Currently living in Grand forks, ND and it has been a huge culture shock moving from a place that has poke, sushi, and great seafood to a place were they think if you add Tabasco sauce to mayo it makes a sandwich Mexican. Plus its cold up here and I hate the cold. I am gonna go back to Oahu next April for surf session and to regain my sanity.
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Post by splischke on Oct 23, 2011 13:32:12 GMT -5
Yes, scrap 0.025" T-3. Nothing special about these baffles. I made all 4 in about an hour. Each baffle has a 90 degree flange with two "V" notches to allow for the sharp bend. I also used a shrinker to form the gradual curve but a couple more notches would have worked just as well. The baffle's flange was riveted to the head using aluminum pull rivets. The inter-cylinder baffles were attached using safety wire. Oahupilot... it's a huge culture shock. I grew up on O'ahu and moved to Scottsbluff, NE after college. 25 below zero was no fun. Kauai (note spelling is my favorite Island too. My roots go back 100 years to Hanamaulu, Kauai. It's my retirement spot if the wife permits. -Scott
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Post by oahupilot on Oct 23, 2011 17:22:21 GMT -5
Scott,
Kauai is by far my favorite island, If only I had a enough of cash to buy a one bedroom studio on Kauai and not have to work I would have become a permanent surf bum.
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Post by juergen on Nov 3, 2011 3:55:17 GMT -5
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Post by oahupilot on Nov 3, 2011 20:12:00 GMT -5
Juergen,
I can not tell from your photos but it looks like you did a layup directly over the jugs, with just a layer of tape to separate them. I actually offset my baffles from the jugs by about 5mm, the purpose is to prevent the chafing/rubbing of the baffles against the jugs due to engine vibrations.
Interested in seeing how that bottom cooling plate works out for you.
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Post by juergen on Nov 4, 2011 3:49:16 GMT -5
I had made multiple layers of tape, so the distance is about 2-3mm from fins. The baffle have about 3mm thickness. For resin, I used Polyester, because it is a good choice for higher temps. Before installed, I had tempered the baffles in the baking oven in the kitchen up to 80°C (170°F), step by step (50,down,60,down, 70,down,80°C) over long time (about 2 or 3 days, I do not remember it exactly ) This baffles decrease the temps about 50°F from my last setup. with best regards Juergen
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Post by gaston on Nov 5, 2011 8:20:40 GMT -5
Hi Juergen
great work on your baffles...
Having a look at you photos, I think I see double spring on your valves do I see right ??
and I also think I see the spring on the intake valve (front left cyl.) to be installed wrong end first as the close coiled end seems to be out...maybe I'm wrong it may be OK,it's hard to see on a photo... just my 2 cents
Gaston
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Post by juergen on Nov 14, 2011 9:34:24 GMT -5
Hi Gaston, yes, there are double springs, but the springs are in the right direction, its a problem of the picture perspective. with best regards Juergen
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peterzabriskie
Junior Member
"Did I make that part the best I possibly could have?" Unknown
Posts: 99
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Post by peterzabriskie on Nov 17, 2011 7:36:24 GMT -5
Scott, Kauai is by far my favorite island, If only I had a enough of cash to buy a one bedroom studio on Kauai and not have to work I would have become a permanent surf bum. Born and raised on the ocean beach and a lifelong surf bum, just different ocean...would love to see Kauai. ON Topic..venturi effect.... as I am not an engineer I may be way off here, but Jeurgen and Oahupilot are molded baffles very close to the heads best? I see the expanding hot air has to exit out the cowl bottom which has been discussed and "sucks" the air through as it goes(or does it?) But would baffles that take the INLET air and symmetrically / or proportionately (like a carb throat) introduce it to the top end of the fins create a strong venturi effect that would enhance the cooling? It looks like the molded baffles are "ramming" the air into the topside cylinder fins. -Pete
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