I am slowly building a 1.6 Miata motor to replace the one in the current car. I currently have a block bored 20 over with matching pistons that is coming together. I thinking about having it ported and polished. Any other suggestions? This car isnt being built for any racing class, but wanting a little more power since It needs a rebuild anyway
Somewhere out there is a nice webpage from a Miata guy abou his porting work. I used it as a guide for my 1.6. A little cleaning of roughness, some unshrouding of the valves on the bore side, and I think a knocking off of the sharp ridge in the pocket (that might be the Spitfire though).
I've never dynoed the engine. I can say that my little 1.6 does not fall over dead when I turn on the A/C.
Try this:
http://blogs.insideline.com/roadtests/2012/05/1997-mazda-mx-5-miata-keegan-engineering-head-and-porting-tech.html
Send the head to Bob at Race Engineering. Call him up. Tell him what you are doing with the car and have him do the head. In SM trim, his head work is usually good for high teens low 120 RWHP. He can probably get more power oout of the head if not done to restrictive SM rules.
http://www.raceengineering.org/race-engineering-news.html
Dashpot wrote:
Try this:
http://blogs.insideline.com/roadtests/2012/05/1997-mazda-mx-5-miata-keegan-engineering-head-and-porting-tech.html
Hmmmm, having performed a lot of work on 4AGE heads(Toyota). I like what I see in the above article. In particular I agree with his thoughts on porting specific areas... to gain volume AND velocity and NOT just looking hogging something out for simple flowbench #s
Here is my photo archive of my porting work - http://s79.photobucket.com/albums/j143/oldeskewltoy/MOmo/