CNC PORTED NYTRO HEAD

[Macheater]

I am just amazed at the extra expense of 'snowmobile' cylinder head porting vs. 'motorcycle' head porting......more than double.

I'm with ya on that brotha! The other thing is too, as long as I've been racing and tinkerin with bikes (some 35+years), the horsepower claims for these mods have seemingly gone up. Used to be a good multi-angle valve job would get ya 3-5 horsepower and a good port job would get ya 6-10 horsepower. Now some shops are claiming upwards of 20 horsepower for porting and a valve job. Just seems a lil too good to be true.

In reality I would be happy with the 10 horse addition.

Regardless, when I get the head done on my N/A apex I plan to do a before and after dyno test. Hopefully, over the spring or early summer. Stay Tuned!

 

[wantboost]

Are you able to do rx1/apex heads?

 

[yukon yamaha]

I think there is good power in a ported and polished head, but the real power comes when you shave the head. Take it down twenty thou and run premium!! amazing!

 

[Macheater]

I think there is good power in a ported and polished head, but the real power comes when you shave the head. Take it down twenty thou and run premium!! amazing!

Not to start a huge debate but, 20 thou is not really that much. Just as a point of reference, when I put a thinner head gasket on my 2002 GSXR-1000 (about 25 thou) it raised the compression about a half a point. On the dyno it picked up 2.5 horsepower. Went from approximatly 148.5 to 150 which is only 2.5/148.5 x 100% = 1.7% more horsepower. If ur butt dyno can feel that it must be very sensitive.