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Mini mystery cylinder head. (Leyland/BMC)

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103 replies to this topic

#101 gruntguru

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Posted 05 October 2014 - 03:58

You could always put me out of my misery with a link?


#102 carlt

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Posted 05 October 2014 - 10:57

5 port can't  breath enough for more than 150-160 bananas - any more is a pipe dream 

#103 Catalina Park

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Posted 05 October 2014 - 12:24

I would guess a 7 port.

#104 Lee Nicolle

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Posted 05 October 2014 - 22:48

Ah but no one said "standard configuration" did they? The only stipulation was "unsupercharged".


I know the 1275 bottom end is regularly stretched to around 1600 cc. Put an eight port crossflow head - better still a 16v twin cam head from a Yamaha or similar on top and I would be surprised if the power didn't approach 200 hp.


I know you know sprintcars but a 700 hp sprintcar engine is pretty mild in terms of power spread and rpm and also durable compared to say a Nascar engine which doesn't even run ram tubes or Methanol but can run at 900 hp for a couple of hours.

Actually a 360ci Chev  Sprintcar engine at 700-720 is pretty strong for a standard configuration engine. eg 23 deg heads all in the [generally] standard position.

410s are entirely different, almost unrecogniseable as the base engine design.

Speedway Super Sedan engines are going that way too, and good ones have over 700hp though have very little driveability. The driver has to keep the engine screwed up tight all the time. Then the old fashioned 18 deg and even 23 deg engines steam past in traffic.

Nascar engines these days are a 2 valve pushrod race engine but even before had very little similarity with the base engine. The Fords had some similarity to a Boss 302 in the basic head layout.

As for Minis and 200hp from a std configuaration head. Tell em their dreaming!