Then their gonna love the caustic soda bath their currently in Timmy
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| 1220 auto build https://www.ausmini.com/forums/viewtopic.php?f=5&t=90434 |
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| Author: | simonw [ Mon Oct 05, 2015 6:54 pm ] |
| Post subject: | Re: 1220 auto build |
Anybody have a particular favourite carbide tip they recommend? I might steal Docs trick of setting it up on drill press .... |
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| Author: | simonw [ Mon Oct 05, 2015 6:55 pm ] |
| Post subject: | Re: 1220 auto build |
Then their gonna love the caustic soda bath their currently in Timmy
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| Author: | simonw [ Tue Oct 06, 2015 11:59 am ] |
| Post subject: | Re: 1220 auto build |
 Is this bad? |
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| Author: | drmini in aust [ Tue Oct 06, 2015 12:14 pm ] |
| Post subject: | Re: 1220 auto build |
Pretty crusty but I've seen worse. Give it a nice long soak in molasses and water, 1:3 ratio. Or vinegar. Top face of head can be decked a few thou to clean up when the rust monster has gone. |
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| Author: | simonw [ Tue Oct 06, 2015 12:53 pm ] |
| Post subject: | Re: 1220 auto build |
Doc there is a chunk taken out of the top right stud hole , is it imperative to have this recess all nice n flush? |
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| Author: | drmini in aust [ Tue Oct 06, 2015 1:05 pm ] |
| Post subject: | Re: 1220 auto build |
If not flush there the water can get into the thread. After you derust it, fill that bit with JB weld (filled epoxy) or similar. Run a 5/16 UNC plug (bottoming) tap into the threads to clean them, but do NOT tap any deeper. |
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| Author: | simonw [ Tue Oct 06, 2015 1:37 pm ] |
| Post subject: | Re: 1220 auto build |
    This was the result of the caustic soda bath with a high-pressure waterblast afterwards, then spraying some metal prep conditioner over the whole head. Ended up getting this funny white powdery stuff:) |
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| Author: | simonw [ Tue Oct 06, 2015 1:39 pm ] |
| Post subject: | Re: 1220 auto build |
Thanks doc . I think I might try my new silicon bronze rods on this to build it up 
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| Author: | simonw [ Tue Oct 06, 2015 1:45 pm ] |
| Post subject: | 1220 auto build |
The head measured 69.7 or 2.7440" I'm guessing this has been decked before as the original is 2.75" or 69.85mm right ? |
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| Author: | drmini in aust [ Tue Oct 06, 2015 1:53 pm ] |
| Post subject: | Re: 1220 auto build |
If you are going to braze it, preheat the whole head first to avoid cracking. It's cast iron. Put head on a 2 burner camp stove. Light. Open beer, drink. Repeat last step... When all the paint etc has burned off you are ready to go. Braze head. I use nickel bronze, it's less runny, and stronger than manganese bronze. Use bronze welding flux, not the stuff on the coated rod. Turn stove off. Erect a teepee or frame well above the stove and cover with blanket/doona/whatever. Leave to cool, it'll take hours. Have another beer or 3.. If you are going to MIG or TIG it with silicon bronze, I would still preheat it as above. Maybe a bit less. [edit] That height may be original, the 2.750" is a nominal measurement. |
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| Author: | aspman [ Tue Oct 27, 2015 3:17 am ] |
| Post subject: | Re: 1220 auto build |
have you guys looked at the minisport 202 head, it's an exchange deal with oversize cooper inlets. I would have thought oversize exhaust in these would be a boon also. Is this a viable option or to much $$$. |
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| Author: | CPOCSM [ Tue Oct 27, 2015 5:35 am ] |
| Post subject: | Re: 1220 auto build |
The metal prep will leave a coat of I think zinc oxide on bare metal surfaces to inhibit the rust and allow for a nice contact for painting. Shouldn't be too much to worry about though and will always clean off with another blast. |
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| Author: | timmy201 [ Tue Oct 27, 2015 6:37 am ] |
| Post subject: | Re: 1220 auto build |
aspman wrote: have you guys looked at the minisport 202 head, it's an exchange deal with oversize cooper inlets. I would have thought oversize exhaust in these would be a boon also. Is this a viable option or to much $$$. It seems a bit on the high side for essentially a standard head with an unleaded conversion. |
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| Author: | simonw [ Tue Oct 27, 2015 12:11 pm ] |
| Post subject: | 1220 auto build |
Unless your chambering and porting, the miniskirt head will offer nothing more than your local head shop could do , probably for a lot less . |
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| Author: | aspman [ Tue Oct 27, 2015 1:50 pm ] |
| Post subject: | Re: 1220 auto build |
simonw wrote: Unless your chambering and porting, the miniskirt head will offer nothing more than your local head shop could do , probably for a lot less . lol, miniskirt. that's all I will see from now on TY. |
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