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Return of the Connew... story!


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#351 Barry Boor

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Posted 24 January 2016 - 19:09

It would be interesting to measure the engine down at Filching Manor to see how much smaller it is. We could have joined it all together without measuring but then it would certainly never have fitted onto our, or indeed, anyone's chassis.

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#352 Lee Nicolle

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Posted 24 January 2016 - 23:50

In post #325 there is a picture of the two aluminium cylinder heads that we have built up from the castings supplied to us by Karl Foulkers-Halbard.  Yesterday we bolted them to the chassis for the first time....

 

bolted.jpg

 

Later in the afternoon the two cylinder heads were joined for the very first time to the big triangular front section of the engine.  It is the first time that we really felt we have something that is beginning to look like a real engine.

 

However, one major hurdle that constantly needs overcoming is the fact that there is a degree of shrinkage when aluminium is cast.  Therefore, every time we bolt two pieces of aluminium together, the overall size of what we have is smaller than a real engine would be.  If our 'engine' was just going to be a static exhibit, this wouldn't matter but we are building up the whole car and the crucial dimension is, obviously, the distance across the top mounting points.

 

So, we have to fix the two cylinder heads in absolutely the correct position, relative to one another and then make everything else fit from there down. This means that spacers are being introduced in various places in order to make everything fit properly.  The hope is that when all the ancillaries are added, the presence of these 'extra' bits will barely be noticeable.

 

It all would have been so much simpler if we had been able to get our hands on a real engine.....

 

Still, it is what it is and we labour slowly on. 

I think Peter needs a smaller shed. You can nearly walk around the car!

The one the car was built in was huge in comparison!



#353 Barry Boor

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Posted 24 January 2016 - 23:59

Well, Lee, the series of sheds that the car and Peter's machines etc are in is certainly longer than the one in Chadwell Heath but it is L shaped and the section where the chassis currently sits is the only part wide enough to hold car but when/if we ever get it standing on its wheels, we certainly wouldn't have room to put the nose on, nor will we be able to get the car out.......

#354 Ray Bell

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Posted 25 January 2016 - 23:16

From memory, aluminium shrinkage is the same as cast iron shrinkage, or nearly the same...

About an eighth of an inch in a foot.

#355 Lee Nicolle

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Posted 26 January 2016 - 01:49

Suggestion, IF you can borrow the real items to reassemble the car you can then space the imitation bits to fit. That way if and when the real stuff becomes available it will just bolt together. That includes headers too.