alloy heads....

[mini63]

a few interesting pics from one of my old tuning books...and I like a good cutaway too.

[AndyB72]

Think I've got that book somewhere.

Bought some 40s earlier this week for the Speedwell 7 port, this seemed like a good thread to add some quick mockup photos, its a bog old unit with the carbs on...

[mk1]

Whoever restored that Speedwell 7 port looks to have done a beautiful job

[rich@minispares.com]

those manifolds look a bit special!

[mk1]

They were originally made for 4 semi downdraught AMALS, but have been modified for 40's.

Not the tidiest job ever, but functional.

[m1cH1]

May I ask which book this is? The cutaways look really nice!

Cheers, Mike

[mk1coopers]

I'm guessing with that set up there's definitely going to have to be a few bulkhead tweaks needed on a Mini

[rich@minispares.com]

I'm guessing with that set up there's definitely going to have to be a few bulkhead tweaks needed on a Mini

both bulkheads looking at the length of those inlets!

[AndyB72]

Would def make in-car setting up of the carbs dead easy from the passenger seat
At some point I'm gunna see if Maniflow can make another pair of manifolds.

[mascher]

The book is "The Design and Tuning of Competition Engines" by Philip H. Smith. There are about 5 editions from 1954 to 1971 as far as I know. I have a 1974 printing of the 5th edition so there may be more. Published by Robert Bentley.

My copy has the same pictures on the same pages as the original post.

Kelley

[rpb203]

Is it possible to post a shot or 2 of the rest of the Speedwell 7 port, in particular to the inlet ports on the head, are these two thin oval shapes with a very thin strip of metal between each one? Similar to the Manx 7 port but with the separation of the inlets in the head and not the manifold?
I believe that the head was originally run in an A40?

[mk1]

You are right on all counts, 4 long thin inlets. the head was originally designed for use on an A40.

[rpb203]

Excellent thanks, I don't think that they made many of them, probably just a handful? good that there are 2 together! I believe that Roger Bunting used to race an A40 with one of those fitted?
Not sure how well they worked?