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 Post subject: Re: 1220 auto build
PostPosted: Mon Oct 05, 2015 6:54 pm 
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998cc
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Location: Brisbane QLD
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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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Mon Oct 05, 2015 6:55 pm 
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998cc
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Then their gonna love the caustic soda bath their currently in Timmy :)

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
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- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 11:59 am 
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998cc
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Is this bad?

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 12:14 pm 
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Location: near Baulkham Hills, NSW
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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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 12:53 pm 
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998cc
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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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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 1:05 pm 
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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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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 1:37 pm 
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998cc
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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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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 1:39 pm 
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998cc
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Thanks doc .
I think I might try my new silicon bronze rods on this to build it up ;)

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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: 1220 auto build
PostPosted: Tue Oct 06, 2015 1:45 pm 
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998cc
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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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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 06, 2015 1:53 pm 
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Location: near Baulkham Hills, NSW
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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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 27, 2015 3:17 am 
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848cc
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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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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 27, 2015 5:35 am 
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Location: SE QLD
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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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 27, 2015 6:37 am 
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Location: Wollongong, NSW
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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 Post subject: 1220 auto build
PostPosted: Tue Oct 27, 2015 12:11 pm 
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998cc
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Location: Brisbane QLD
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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Simonw
Brisbane QLD
1st car - 1964 Mini Panelvan 850
Previous - 1978 Leyland LS 1275 Gold
- 1969 Mini K


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 Post subject: Re: 1220 auto build
PostPosted: Tue Oct 27, 2015 1:50 pm 
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848cc
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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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