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Old 07-01-2010, 12:27 PM   #61
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yeah, what y8s said.
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Old 07-01-2010, 01:39 PM   #62
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What's a pulsejet? I don't have google.

I have filled in huge gaps in stainless with my Tig, I've also "sculpted" **** with it, just using filler wire to build up material where I needed it (making stops for the handle on my lawnmower so it wouldn't be so sloppy, etc). Not ideal for strength but easy to do with the control you have with a tig. But if you need the joint to be strong, like in a manifold, then there should be no gap.
http://www.youtube.com/watch?v=lwSpGkHRc84 it makes about 20lbs of thrust, works off of the expansion/contraction or heating/cooling of combustion.

That makes me a lot more confident in being able to do a "turbo-back" exhaust, now i just need to get some of that 220VAC **** up in my garage, i dun seent it in the laundry room and me a/c unit
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Old 07-01-2010, 01:43 PM   #63
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http://www.youtube.com/watch?v=lwSpGkHRc84 it makes about 20lbs of thrust, works off of the expansion/contraction or heating/cooling of combustion.

That makes me a lot more confident in being able to do a "turbo-back" exhaust, now i just need to get some of that 220VAC **** up in my garage, i dun seent it in the laundry room and me a/c unit
the link you posted is an error right now, but the other's you have...man. I want one. it'd be perfect for my neighbors. Damn I wish I had one for this weekend. F' fireworks.

EDIT: That's seriously one of the cooler things I've seen in a while.
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Old 07-01-2010, 10:34 PM   #64
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In my first engineering job, we were working on pulse detonation engines. Basic theory was by making it an actual detonation, there would be greater kick and thrust yield/mass of fuel. Way louder. Not sure if anyone has a viable propulsion system yet, though.
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Old 07-06-2010, 12:49 AM   #65
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I went into my exhaust makers today to try and get a price and it was a waste of time!
They wouldnt give me a price unless I took the car to them which I couldnt do!

So I asked for a price for them to sell me the pipes so I can get it done myself and they wanted 58 + VAT for 2M of 3" stainless. The same pipe is 38 off the internet. So I walked out in discrase!
I think the price is not the same, the local shops in every area shows you a different price. And I thought things put up for sale online were more expensive. I thing the price you found on the net was excluding shipping.

Last edited by gordonjj; 07-14-2010 at 08:01 PM.
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Old 07-06-2010, 12:34 PM   #66
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I think the price is not the same, the local shops in every area shows you a different price. And I thought things put up for sale online were more expensive. I thing the price you found on the net was excluding shipping.
Shipping was a fixed rate of 9 and that was for as much as you like!
So I could have got the 2 x 1M length and 2 x 90 degree bends delivered for 70. Thats a fraction above what they wanted fo just the 2M length.
http://exhaustpartsuk.com/index.php?...cPath=102_1366
Look for your self!
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Old 07-06-2010, 12:47 PM   #67
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Originally Posted by y8s View Post
you need center inlet at least. I think you can manage the outlet with the offset or center but the offset gives you a little more tailpipe space (outlet mounted away from the bumper).
plus the center/offset is cheaper than the center/center
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Old 07-06-2010, 04:53 PM   #68
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Here is a link to my self fabricated exhaust thread: https://www.miataturbo.net/diy-turbo-discussion-14/my-attempt-diy-exhaust-8192/

Mine is neither as good nor as pretty as Y8S but it has worked fine for years. I wouldn't even classify some of the connections as welds...more like two pieces of pipe stuck together with some weld wire. I had very little mig experience before I fabbed mine. My resonator is stainless and I mig'd aluminized piping straight to it and those welds actually turned out the best. In my experience migging stainless has been easy.
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Old 07-06-2010, 05:11 PM   #69
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my welds looks like bird doo-doo, but you cant tell cause it's under that car... it works.
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Old 07-06-2010, 06:14 PM   #70
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Clearly I have fooled the masses into thinking my welding is pretty.
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Old 07-06-2010, 07:22 PM   #71
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you sure have. HA.
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Old 07-07-2010, 12:32 AM   #72
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Clearly I have fooled the masses into thinking my welding is pretty.
I wasn't saying your welds looked good, I just meant the exhaust as a whole looked better than my cobbled together mess. Now that I've gone back and actually looked at your welds I regret ever using the word pretty and your exhaust in the same breath. Please forgive me.
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Old 07-07-2010, 12:44 PM   #73
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Looks like you have done a nice job with your exhaust!

The only thing stopping me progressing now is trying to get a downpipe cheap enough which is good!

I would like a 3" all the way through if they exsist. Then once I have that I can start to fabricate the pipe work to that. Without it would be just guess work.
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