There are too many variables. Does the manifold really return that much more heat through the head?

 

Emilio, do you know of a source for vvt cams other than megacycle? I have found no other place.

 

How much do you have in the current head? What did you have done to it?

I think I too am part of the crowd that would rather have a 200HP NA rather than a 300HP turbo for simplicity sake. However, I am where I am, and that is what I will continue to run.

 

Emilio do you think a 6258 will reach your 350-400 power goal estimate? I'm excited to see the fi direction you go in.

 

Hey gays did you notice that the car has 272 cams??? They are prob worth 20hp. My point is that this is a very NOT STOCK MOTOR na build.

 

Enough with the tech talk. What real car guys want to know is what stops the passenger side headlight from vibrating?

 

Who said it was? It's an expensive built motor and I make no pretenses to the contrary.

Maruha

 

Mazda Motorsports had blanks a little more than one year ago, I'll give the last known one to a cam designer/grinder tomorrow.

Mazda might find a new foundry for VVT blanks sometime. Otherwise you have to weld/grid the stock one.

I hope to get my build just behind Emilios numbers in the end, although using 84mm ST and only going to 7500.
But I have Jenveys on the shelf and a decent header would also be needed (Staal looks good). But I will start with a squaretop and a RB header (I have them, not mounting issues, and they work for run-in purposes).

 

Maruha makes my wallet scared. Are those cams better specs than the integral:megacycle cams? For powerr.

 

I suppose that would depend on the application. Maruha only has one grind and looks like something that would still idle nicely, nothing too radical. Call Megacycle for more info on their stuff. Be warned, the folks at Megacycle are not consumer oriented and have no real interest in helping Joe Retail select cams.

Good Miata cams aren't cheap. Get used to that if you want big n/a power

Niklas, my motor would likely benefit quite a bit from IRTB's but its not part of the overall plan.

Building all these n/a motors recently has me wanting to do an all out build and aim for 220whp or something. 14.0:1, IRTB, sequential fuel with individual trim, honkin big cams, 9000rpm. I won't, but its fun to think about at least.

 

OTS supertechs? Stroke length remains unchanged to make it a square 85x85 motor?

 

Yup.

 

Cool, thanks. Shopping list is coming together nicely now.

 

I'd phrase it slightly differently. Good Miata cams are not OTS, you need to go custom.
And custom Miata cams are not any different from any other custom cams.
For my case it's $125 per blank, $200 for the design and $200 per cam for the grinding (taxes removed for comparison), so $850 for a pair of cams for exactly the goals I've set.
You might get the job done for more or less but knowledge cost.The Jenveys scares me a bit with airbox design, moving the ABS for space, throttle cable linkage etc, so I'll run with the squaretop from some time getting the grips with the VVT and the new cams etc.
I want the cams to loose breath at 8000 to have some room for changes in rules/purposes (hard rev limit at 7500 now), so I plan to get "on cam" as early as possible, maybe even as early as 3500. The VVT might make it possible.

 

I bet it could benefit from a Skunk2 manifold at this point.

 

I have a feeling Hustler and many others don't really appreciate how true this post is. lately every other post about n/a track cars is:
"you could just pick up a vvt motor, and make eleventy billion horsepowers on it n/a with this awesome new technology we have
I'm not downplaying this car or motor, and we do have some better parts (specifically engine management) nowadays, but it is nothing groundbreaking and mindblowing from what I can see: just a well planned/executed VERY expensive motor.
lol

 

You should consider looking at our website in a month or two.

 

You just have to pick one of the plentiful 2L BP4W to start from...

I'd not call it "VERY expensive", it cost some, but there is still nothing special. It's just a balanced setup.

 

Lower BSFC on the NA car means that by definition it makes less heat than the turbo car. There's also the matter of the turbo car breathing through a very, very tiny restrictor (colloquially called a "turbine housing") instead of a set of big 4-1 primaries, and then there's the matter of the intercooler cutting down on the airflow going in the front of the engine by a fair amount. It's the price we pay for 200ft.lbs at 3500rpm

This is pretty bitchin' cool, Emilio. I am loving the flat power at 8k+. I wanna drive

 

Wow we actually agree. Lotto ticket time