Gipsy manifold material

Gipsy manifold material

This topic has 10 replies, 7 voices, and was last updated 21 January 2020 at 07:14 by JasonB.

Viewing 11 posts - 1 through 11 (of 11 total)

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19 January 2020 at 15:32 #447561
David K
Participant
@davidk77137
According to my plans the inlet manifold should be made of mild steel.

looking at a couple of completed engines on the internet I notice one has used brass and another has used a mixture of brass and steel as the one pictured below.

Is there any reason for using brass , as in the bottom plate on this one,
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19 January 2020 at 15:32 #27085
David K
Participant
@davidk77137
19 January 2020 at 15:34 #447563
old mart
Participant
@oldmart
It looks pretty.
19 January 2020 at 16:05 #447576
JasonB
Moderator
@jasonb
And it does not show the silver solder joint
19 January 2020 at 16:13 #447579
Steviegtr
Participant
@steviegtr
WOW. Very nice.
19 January 2020 at 19:25 #447634
David K
Participant
@davidk77137
Stainless it is then.
19 January 2020 at 19:33 #447635
JasonB
Moderator
@jasonb
I think if I were doing it I would machine some stock down to 0.475" and then mill out the recess from below to 0.425" deep and then recess the bottom plate into the 3/8" wide passage so no joints are visible unless you are looking from underneath.
19 January 2020 at 19:41 #447638
Anonymous
Depends on which engine, but on the Gipsy Major the inlet manifold was steel. It has two half pressings with a welded seam and individual steel plates welded on that bolted to the cylinder heads.

Andrew
20 January 2020 at 18:19 #447839
Tim Stevens
Participant
@timstevens64731
Brass has an expansion coefficient very close to that for Al alloys. The value for Steel is rather less. I suspect this might have been one factor in the mind of the bloke what made it.

Cheers, Tim
21 January 2020 at 00:45 #447937
Paul Kemp
Participant
@paulkemp46892
Posted by Tim Stevens on 20/01/2020 18:19:24:

Brass has an expansion coefficient very close to that for Al alloys. The value for Steel is rather less. I suspect this might have been one factor in the mind of the bloke what made it.

Cheers, Tim

Not sure I follow your thinking there? Steel top, brass bottom, sounds like a recipe for a banana to me? As it's the inlet manifold would it actually get hot enough over its length to make any appreciable difference? If it were the exhaust a different story maybe. If you are suggesting coef of ex to match the aluminium crankcase then that only holds good if the whole thing is brass?

Paul.
21 January 2020 at 07:14 #447948
JasonB
Moderator
@jasonb
The lower tapered part down to the carb is aluminium but at such a small size I doubt expansion would be an issue and the suggested Araldite to join it would have enough flex to compensate.
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