Author Topic: Cylinder head interchange  (Read 4617 times)

Offline racer0x

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Cylinder head interchange
« on: February 12, 2016, 01:57:35 pm »
Question is it possible to put a 1250 head on a 1200?




Offline racerrad8

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Re: Cylinder head interchange
« Reply #1 on: February 12, 2016, 07:31:05 pm »
As long as it does not have the EGR ports/tubes it can be used on a 1200.

Randy - RPM
Randy - RPM
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2010 INEX/Intercomp Raceteam of the Year.
2009 INEX National and World Champion, Thunder Roadster.


Offline justfreaky

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Re: Cylinder head interchange
« Reply #2 on: February 13, 2016, 12:32:18 am »
Have to ask...
Would that not lower compression?
Also; Is it legal? I guess that is the bigger question.
Interesting theory!

Steve
Better to be hated for who you are, Than to be loved for who you are not.

Offline ZForceRacing01

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Re: Cylinder head interchange
« Reply #3 on: February 13, 2016, 04:22:44 pm »
Its always legal till u get caught ;)
"People sleep peacefully in their beds at night, only because rough men stand ready to do violence on their behalf" , George Orwell

"In war it does not matter who was right, only who is left", Anonymous

Offline justfreaky

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Re: Cylinder head interchange
« Reply #4 on: February 13, 2016, 05:01:23 pm »
LOL! True, that.  ;D

Steve
Better to be hated for who you are, Than to be loved for who you are not.


Offline racerrad8

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Re: Cylinder head interchange
« Reply #5 on: February 15, 2016, 10:55:22 am »
Have to ask...
Would that not lower compression?
Also; Is it legal? I guess that is the bigger question.
Interesting theory!

Steve

Why would it lower the compression?

Any XJR head without the EGR ports is a legal installation onto a 1200.

Randy - RPM
Randy - RPM
randy@rpmracingca.com
2010 INEX/Intercomp Raceteam of the Year.
2009 INEX National and World Champion, Thunder Roadster.


Offline justfreaky

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Re: Cylinder head interchange
« Reply #6 on: February 15, 2016, 05:49:25 pm »
Randy,

I was thinking about combustion chamber size. Since I do not know the difference in the heads, I was asking.

Steve
Better to be hated for who you are, Than to be loved for who you are not.

Offline racerrad8

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Re: Cylinder head interchange
« Reply #7 on: February 15, 2016, 08:14:53 pm »
Randy,

I was thinking about combustion chamber size. Since I do not know the difference in the heads, I was asking.

Steve

The heads are the same internally, just different in the amount of fins machined away on the outside between the FJ & XJR design and the EGR ports.

Those are the only two differences.

Randy - RPM
Randy - RPM
randy@rpmracingca.com
2010 INEX/Intercomp Raceteam of the Year.
2009 INEX National and World Champion, Thunder Roadster.


Offline justfreaky

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Re: Cylinder head interchange
« Reply #8 on: February 15, 2016, 09:24:26 pm »
Thanks for the info Randy.

Steve
Better to be hated for who you are, Than to be loved for who you are not.

Offline DLR96

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Re: Cylinder head interchange
« Reply #9 on: November 04, 2018, 04:35:54 pm »
So if the 1250 head has the egr's block off is it legal.


Offline justfreaky

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Re: Cylinder head interchange
« Reply #10 on: November 04, 2018, 06:09:37 pm »
I believe it is.

Steve
Better to be hated for who you are, Than to be loved for who you are not.

 

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