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Old 01-10-2013, 01:52 AM   #201
Alex Buchka
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Thanks Pat. The tube sizes and basic geometry are from the FIA Group N manual. Not building it to fit into any certain racing class, just trying to make a safe cage that won't become a box of spears in the event of a roll-over or collision.
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Old 01-10-2013, 10:17 AM   #202
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awesome.
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Old 01-11-2013, 02:05 AM   #203
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More tubes:







The tube that goes across the front of the windshield is bent and notched, just needs a little more trimming to fit in. The first batch of DOM tube is now all used on the car. Probably going to need an extra 60-80ft to finish up the entire cage structure.
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Old 01-11-2013, 03:21 AM   #204
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FYI, you really should grind the fishmouths back until they are full thickness. Welding them like that, you either need to back way off on the pedal in order to not burn the edge of the tube away because it is so thin, which means the effective weld cross section and tube wall thickness of that part of the joint is much less than nominal. Or, you have to "chase" the melting away edge around the pipe which is also not great.

Awesome to see progress though!

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More tubes:







The tube that goes across the front of the windshield is bent and notched, just needs a little more trimming to fit in. The first batch of DOM tube is now all used on the car. Probably going to need an extra 60-80ft to finish up the entire cage structure.
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Old 01-11-2013, 03:52 AM   #205
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how do you bend the tubes?

Siliconesand and Fire? Or do you have a bender?
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Old 01-11-2013, 10:24 AM   #206
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Quote:
Originally Posted by Captain Bondo View Post
FYI, you really should grind the fishmouths back until they are full thickness. Welding them like that, you either need to back way off on the pedal in order to not burn the edge of the tube away because it is so thin, which means the effective weld cross section and tube wall thickness of that part of the joint is much less than nominal. Or, you have to "chase" the melting away edge around the pipe which is also not great.

Awesome to see progress though!
Thanks for the tip Kenny. I've encountered both of those issues before. I just don't do much tube fitting so grinding the fishmouths back never occurred to me. *facepalm*

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how do you bend the tubes?

Siliconesand and Fire? Or do you have a bender?
JD-Squared Model 3. It's a really high quality machine.

http://jd2.com/p-32-model-3-bender.aspx
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Old 01-11-2013, 11:11 AM   #207
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Bit of a change of subject -- do opposing pistons share a common crank throw (odd-fire) or is it an even-fire crank? I know there's a balance shaft to deal with the 60 degree/V8 dynamic balance issues, I assume it's also odd fire and the balance shaft deals with that also. All of that to ask -- what's the exhaust note sound like on one of these?
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Old 01-11-2013, 11:47 AM   #208
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Quote:
Originally Posted by M.H. Yount View Post
Bit of a change of subject -- do opposing pistons share a common crank throw (odd-fire) or is it an even-fire crank? I know there's a balance shaft to deal with the 60 degree/V8 dynamic balance issues, I assume it's also odd fire and the balance shaft deals with that also. All of that to ask -- what's the exhaust note sound like on one of these?
The crank pins are split, making it even fire. You can see the pins here:



This is the best exhaust video I've been able to find. I think it sounds good.



Noble M600 videos aren't really indicative because of the turbochargers.
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Old 01-11-2013, 03:04 PM   #209
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Does sound nice - bit higher pitched and dare I say more exotic than a 90-degree V8 without a flat plane crank ('domestic' V8).
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Old 01-11-2013, 07:26 PM   #210
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I've heard the V8 uncorked a few times, when replacing cat-back exhaust systems on them at the dealer. Sounds pretty bad ass, unfortunately couldn't drive it around like that, but revving it sounded wicked. Really wanted a Bertone that sounded like that...
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Old 01-13-2013, 11:31 PM   #211
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I couldn't help myself so I hung the front wheel on there with a piece of string. It's a little too high where it's sitting but it paints a good picture. Gave me a real boost of motivation.



Measured the cams:



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Old 01-13-2013, 11:38 PM   #212
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lookin good
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Old 01-13-2013, 11:46 PM   #213
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Dat's epic.
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Old 01-14-2013, 12:37 AM   #214
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Dice not hangin...
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Old 01-14-2013, 02:12 AM   #215
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Hang a door and fender on it so I can use it as a desktop
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Old 01-14-2013, 02:33 AM   #216
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Fin
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Old 01-14-2013, 03:21 AM   #217
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Old 01-14-2013, 05:57 AM   #218
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This car will look AMAZING!
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Old 01-14-2013, 11:28 AM   #219
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Quote:
Originally Posted by Karl Buchka View Post
The crank pins are split, making it even fire. You can see the pins here:



This is the best exhaust video I've been able to find. I think it sounds good.



Noble M600 videos aren't really indicative because of the turbochargers.
Cool! Any pics of the balance shaft wackiness?

Thanks!

-Ryan
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Old 01-14-2013, 11:45 AM   #220
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Dice not hangin...
Aero testing.
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Old 01-14-2013, 06:52 PM   #221
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Nice fitment on those tubes.
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Old 01-14-2013, 07:13 PM   #222
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Quote:
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Cool! Any pics of the balance shaft wackiness?

Thanks!

-Ryan
You dont ever want to see deep enough inside to get into that balance shaft. Just plain no fun to do in the car & they dont pay you to pull it out. Im jealous that he gets to really play with a b8444s. We dont see to many thru the shop. I can confirm that they sound nasty w/o the exhaust hooked up. You have to drop a section to replace the rack on a XC90. Always get started before i reinstall.

I'll assume you are going to fab an intake to rework the stock ETM being at the rear. And that dopey 3200RPM intake runner switchover. Very nice build.
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Old 01-14-2013, 09:46 PM   #223
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Nice fitment
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Old 01-14-2013, 10:30 PM   #224
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I believe the phrase he meant to use was 'a nice level of fitivity.'
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Old 01-14-2013, 10:33 PM   #225
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Quote:
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Measured the cams:



Wow. So simple. I need to do this to the stock GTE VVTi cams to figure out what they're closest to since nobody seems to have info on those cams. Pretty neat for basic tools.
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