1/3 Scale Austin Seven Engine

Rob.Barrett · Dec 5, 2012

Hi All,

Progress so far on the cylinder head. It's made from two bits (to give a water jacket) which are dowelled together with 18 dowels.

Rob

MuellerNick · Dec 5, 2012

That looks very promising!

Nick

Jasonb · Dec 5, 2012

Thats a nice start to a project, is the head cast or carved from solid?

I'll be following this one haveing rebuilt a 1928 Swallow with my brother a few years back from a pile of bits.

J

compspecial · Dec 5, 2012

Looks like a beautiful casting, Rob hard to believe they got away with two main bearings though, must've been a very springy crankshaft!
Stew

MuellerNick · Dec 5, 2012

Looks like a beautiful casting,

My bet is: This ain't a casting.
I see some hints that it is milled. And doweling it together out of two parts is just an other hint.

Nick

sunworksco · Dec 5, 2012

Very nice project !

Rob.Barrett · Dec 5, 2012

That's right Nick, it's made of two bit of machined plate, a lot of dowels and some fancy glue.

idahoan · Dec 5, 2012

That's a nice piece of work; I will be looking forward to more updates on this project.

Dave

sunworksco · Dec 5, 2012

Can something like this be hard silver soldered ?

Jasonb · Dec 6, 2012

Not when its been made out of alluminium like that one.

I can be done with silver solder if made from cast iron, Mike Sayers well known Bently engine is has the block soldered from 11 parts. Its a bit more involved than usual silver soldering needing preheat, driving off the carbon and the right flux.

sunworksco · Dec 6, 2012

What if it was machined from 304L stainless steel ?

Jasonb · Dec 6, 2012

Yes with the right flux to remove the oxide of chromium though hacking it out of CI will be a lot easier going than stainless.

J

pgp001 · Dec 6, 2012

I will be watching this build with great interest, I have an Austin 7 myself and know all about building and modifying full size engines.
I have often thought a model of my own car would be an interesting project some day, but thinking about it is as far as I have got.

My car

Phil

kuhncw · Dec 7, 2012

That is a very nice piece of machine work. Do you have any photos of the two parts before they were joined, that you would post?

Regards,

Chuck

Rob.Barrett said:
That's right Nick, it's made of two bit of machined plate, a lot of dowels and some fancy glue.

Niceonetidy · Dec 7, 2012

very nice indeed

Rob.Barrett · Jan 16, 2013

Thanks for the comments.
Here's the water outlet manifold.

moanaman · Jan 16, 2013

compspecial said:
Looks like a beautiful casting, Rob hard to believe they got away with two main bearings though, must've been a very springy crankshaft!
Stew

The 2 bearing motor was used a lot for racing in the 750cc class. Reason for this is that crank ran in roller bearings. Yes they snapped very easily. You can purchase a crank now that has been machined from a billet. Expensive but seems to last a lot longer.

About 1930 Austin changed the crankshaft to a 3 bearing white metal but these were not favoured by the race crowd as it has more friction than the 2 bearing roller crank.

Rob you have done a great job on the head. Next step is to make a twin OHC version. (just kidding)]

Rob.Barrett · Feb 5, 2013

Progress so far on the cylinder block. It's machined from a solid block of 2014 T6 with wet cast iron liners. There are a lot of plugged cross drillings for the additional water ways.

Regards,
Rob

Maxine · Feb 5, 2013

Absolutely beautiful work. Very inspiring to look at. Thanks for posting!

aonemarine · Feb 5, 2013

That's awsome!! I assume your using cnc??

1/3 Scale Austin Seven Engine

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