[Healeys] BN 7 MkII heat shield

[John McElrath]

Thanks - This is a great picture to add to my collection - but I wonder if
this is the early or late heat shield. In the picture in Robson's book on
page 65 the asbestos looks like it is on the bottom side of the heat shield
and not the top.

The boiling over problem was a big issue with my first tri-carb - the car
definately had to be in tune an running properly.  This is also one of the
reasons I wonder about the comments I have read that says there was no
overflow pipes on the early cars.  All the previous cars has overflow pipes
that I am aware of and it would see strange that Healey would knowling sell
a car that would pump gas onto a hot exhaust system. They already knew that
the BT7 could dump gas onto the manifold and took care of that.

It may well be that the first own of this car changed to the later heat
shield and added the overflow drains to solve the problems.  I just don't
know and can't find the orginal owner yet.  Someone over the years did some
pretty bad body work on this car so they weren't too careful.  They painted
the red interior black and the black car white over everything.

Thanks for your help.

John
On Mon, Jan 12, 2009 at 11:49 AM, Peter Svilans <peter.svilans at rogers.com>wrote:

>  John
>
> Here is a nice side view of the new 29E engine showing the early
> (single-layer of asbestos) heat shield from p.193 of Browning & Needham's
> 'Healeys and Austin-Healeys'
>
> And Gary, I would imagine that only a few hundred numbers into the new
> triple-carb 29E motor, they were still ironing out running and overheating
> problems, rather than improving the 'performance' as such, with their bigger
> balance pipe and better heat shield.  By the way, the carb return springs
> were changed at that same point as well.  Even with two asbestos layers the
> fuel in the rear bowl could STILL boil on occasion....
>
> Best
> Peter