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Old 03-12-2007, 10:22 AM
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Welding combustion chambers

Raising compression ratio is a top priority here because of the 6.600 feet of altitude, since obtaining aftermarket heads or even domed piston is quiet dificult from here, I was thinking of weld filling the cc's of the sbc engines, I have some experience welding cast iron but have some doubts here, what kind of welding rod should I use? I always use pure nickel rods for welding cast iron, will brass rods used for brazing would work? they join cast iron pretty well also and is very easy to machine not so with nickel.
I have filled rice burner aluminum heads with good results but have never tried with good old american iron.
Please comment.
Augusto.

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Old 03-12-2007, 10:54 AM
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Can you not just mill the heads?

From what I know, only use nickel on cast iron. You also need to peen the weld as you go.
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Old 03-12-2007, 12:13 PM
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milling the head upsets the intake manifold alignment and I don't want to deal with that extra complicated machining operation. besides not much is gained, I need to raise like 2 points.
Augusto.
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Old 03-12-2007, 05:58 PM
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When I rechambered my heads, I completely disassembled them, heated them until red hot in an oven and filled them in with nickel while hot.

This is the only way I would weld the combustion chamber of a head. I've only done this once, but they haven't come apart yet...(knock on wood).
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Old 03-13-2007, 08:03 AM
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Quote:
will brass rods used for brazing would work? they join cast iron pretty well
The Problem there is,........
The Filler Metal Softens at 600*,+ Melts at 1200*.........

And that's a tad Low for a Combustion Chamber.......
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Old 03-13-2007, 09:21 AM
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F-BIRD'88:
chevy 350 smog heads

bondo:
yes, I agree, but I think aluminum melting point is lower and heads are made of it, besides the heads never reach that temperatures, only the burnt gases do, they transfer part of that heat to the head but not all, most goes down the exaust pipe, in my karting racing motors wich have aluminum air cooled heads, the temp probe under the spark plugs reads around 350 deg and that is with a 45+ hp motor turning 19.000 rpm, the exaust temp probe reads 1.200 deg at full power.

I see no problem with brass, but that is only my opinion, I would like to hear from others since I've never done it and don't want to screw up, listening others opinions is great and improves knowledge.

Augusto.
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Old 03-13-2007, 10:28 AM
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Seems to me here's a case where swapping to 53 cc chamber 305 cid heads would be the easiest and most econmical way to go. And yes, I know he's out of the states and is at high altitude. It just seems to make the most sense to me. Anyone else? BUTCH.
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Old 03-13-2007, 03:11 PM
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I do have a set of 305 heads, I tougth 1.94 valves did not fit in this heads (I don't know where did I get this idea from) I'm gonna cc them to see what I got, thanks for the tip.
Any reccomendations for porting the 305's?
I bet some intake valve unshrouding must be done.
Augusto.
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Old 03-14-2007, 09:08 AM
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very informative, thanks a lot.
Augusto.
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