Model T aluminum heads-What is the difference in the two?

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Model T Ford Forum: Forum 2012: Model T aluminum heads-What is the difference in the two?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Anderson on Tuesday, September 11, 2012 - 10:12 pm:

What is better for racing? A high profile Z head or low profile head marked with a 24 on the rear of it. I have both and was wondering the difference in the two.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Matthew David Maiers on Wednesday, September 12, 2012 - 12:15 am:

high profile = more auxilliary coolant.


Top of pagePrevious messageNext messageBottom of page Link to this message  By mike conrad on Wednesday, September 12, 2012 - 12:53 am:

I find for racing it's best to have the valves in the head Aka rajo or fronty or dream big, gallvian


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Wednesday, September 12, 2012 - 04:05 am:

The low type alu high compression head available from the vendors has this type of combustion chamber:
http://www.modeltford.com/i/c/945l.jpg
Much the same as a std Ford head, just higher compression.

The Z (and Prus) heads are only available in the high style, but besides the higher compression they have Ricardo style squish areas over the pistons, something recognised by engine designers since the 20's as giving more efficient and powerful combustion in a flathead engine:
z head
prus head


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jared Buckert on Wednesday, September 12, 2012 - 01:01 pm:

So has anybody done any kind of comparison driving between the different heads? It could make an interesting experiment.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Wednesday, September 12, 2012 - 01:50 pm:

The Tulsa Model T Ford club did a lot of that years ago: http://mtfctulsa.com/Tech/heads.htm
http://mtfctulsa.com/Tech/head_dyno_testing.htm

" A 5.7:1 compression ratio would theoretically produce a 25 percent power increase, and yet the Z head and Riley head produced a 42 percent power increase. The greater than theoretical power from these heads is evidently due to their improved combustion chamber design."


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