"Z" versus "Prus" head.

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Model T Ford Forum: Forum 2014: "Z" versus "Prus" head.
Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Richmond, Texas on Sunday, August 10, 2014 - 02:32 am:

The Tulsa Club did extensive testing of various stock and aftermarket heads, including the "Z" head. At that time the "Prus" head was not available for testing. Has anyone done any unbiased comparison testing ,or have any unbiased test figures that can be compared to the Tulsa club's tests on the "Z", to see which one makes the most power?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Sunday, August 10, 2014 - 07:01 am:

Tom Graham did a dyno test comparing a Prus and a Z head on the same engine in 2012, see this thread:
http://www.mtfca.com/discus/messages/257047/324600.html?1354029640

Low end torque about the same but the Prus head gave 2hp more at the top end = 28hp versus 26hp for the Z head. The compression is about equal for both heads but the Prus head follows the Ricardo priciple better - that's the likely cause for the difference.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Constantine on Sunday, August 10, 2014 - 07:37 am:

Z gets "Ford" and "Made in USA" markings; in alloy only.

P is correct for 26-27 cars (NO "Ford" or "USA" markings); in alloy AND iron.

People have reported issues with using the P with low octane fuel. ???

I've used a Z will 80 octane fuel without problems.


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