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Old 05-18-2008, 01:44 PM   #1
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Default MiataRoadster turbo valvetrain kit

Hey Guys,

In our continuing efforts to fill the voids we see in the Miata aftermarket, MiataRoadster is planning a 94-00+MSM turbo camshafts/shimless solid lifters/big valves/progressive beehive springs/Ti retainers/keepers/bronze guides/Viton seals valvetrain kit.

Please post here what cam grind you'd prefer to see (and why) and if we see a theme develop, we'll incorporate your wishes into our final specs.

Feel free to email me: [email protected]

Thanks,

Bill
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Old 05-18-2008, 01:47 PM   #2
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lol, welcome to the land of milk an honey.
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Old 05-18-2008, 02:05 PM   #3
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Sounds good. More lift, less duration please. And don't forget the exhaust cam will also work on 01+.
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Old 05-18-2008, 09:18 PM   #4
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What are shimless solid lifters and how does one adjust the lash without shims?
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Old 05-18-2008, 09:44 PM   #5
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Quote:
Originally Posted by jasonrobo02 View Post
What are shimless solid lifters and how does one adjust the lash without shims?
We've found a source for solid lifters that are available with specifiable stem lengths, so no need for lash caps/shims.
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Old 05-18-2008, 09:51 PM   #6
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How much?
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Old 05-18-2008, 09:56 PM   #7
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I don't like the idea of the actual lifter of different heights...it's going to add excessively to the cost. You would have to purchase way too many to properly clearance the valves...not good.

Having the adjustment via shims is much cheaper.

Tony
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Old 05-19-2008, 12:19 AM   #8
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Quote:
Originally Posted by mrtonyg View Post
I don't like the idea of the actual lifter of different heights...it's going to add excessively to the cost. You would have to purchase way too many to properly clearance the valves...not good.

Having the adjustment via shims is much cheaper.

Tony
or even generic lash caps.
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Old 05-19-2008, 07:43 AM   #9
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Quote:
Originally Posted by mrtonyg View Post
I don't like the idea of the actual lifter of different heights...it's going to add excessively to the cost. You would have to purchase way too many to properly clearance the valves...not good.

Having the adjustment via shims is much cheaper.

Tony
I can't say too much at this point without tipping my hand to competitors, but I'll say that you are on the wrong track.

I'm still waiting to see posts suggesting lobe profile specs...

Bill
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Old 05-19-2008, 07:45 AM   #10
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Quote:
Originally Posted by Zabac View Post
How much?
Too soon to say.

Let's see if we can get some suggestions for lobe profiles flowing first, that's the more critical issue...

Bill
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Old 05-19-2008, 11:40 AM   #11
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I'd imagine that there are more qualified people to give you good cam profiles than miataturbo.net forum people.

Why not plan to have a nice street version and an all out version? both can have significantly more lift at least.
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Old 05-19-2008, 12:03 PM   #12
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Quote:
Originally Posted by MiataRoadster View Post
I'm still waiting to see posts suggesting lobe profile specs...
Not sure if he's sharing, but the only person in recent memory that made dyno proven gains with cams on his turbo is Eliminator at m.net.
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Old 05-19-2008, 12:05 PM   #13
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It has always been my understanding that in a trubo motor you need much more lift and a little less duration, how much I have no idea.
It may be a good starting point to look at other motors with lots of aftermarket support in this area to see what numbers they use, this can at least get us started in the right direction.
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Old 05-19-2008, 12:15 PM   #14
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Quote:
Originally Posted by y8s View Post
I'd imagine that there are more qualified people to give you good cam profiles than miataturbo.net forum people.

Why not plan to have a nice street version and an all out version? both can have significantly more lift at least.
Oh, I'm researching everywhere, not just here.

;-D

In my experience, MT.net members seem to know exactly what they want, that's why I'm asking them to chime in.

re: multiple versions

Let's see if we can come up with one product that people want before offering multiple ones, OK?



Our initial goal, as will always be our primary focus, is to support those in our community who are pushing the envelope of Miata performance history:

http://worldsquickestmiatas.com/

Thanks,

Bill
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Old 05-19-2008, 01:42 PM   #15
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Bill, not sure if this helps the cause, but if you check out my sig pic you'll get a feel for how overlap (and I guess duration--in terms of where the intake valve closes) will affect the power band.

But given the compromise, maybe just stock duration and gobs of lift. And a set of adjustable cam gears. gear for me.
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Old 05-19-2008, 01:56 PM   #16
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Old 05-19-2008, 05:54 PM   #17
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i want. for 1.6.
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Old 05-19-2008, 06:42 PM   #18
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Quote:
Originally Posted by Zabac View Post
here I sum up:

Quote:
Originally Posted by y8s View Post
...just stock duration and gobs of lift.

oh and randy's site suggests 9.5mm is the max without having to modify the lifter bosses in the head.

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Old 05-19-2008, 08:22 PM   #19
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That is an awesome read. I wonder how much opening/closing flank the hottest valve springs available can handle? That seems like the ticket to a shitload of power while still operating under the physical lift limitations of the head.

(god i have no idea what i'm talking about)
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Old 05-19-2008, 09:44 PM   #20
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Sav, I'm sure that you'll take some sort of "Mechanisms" class at SLO. For a chapter or two during that class I'm sure you'll be going cam crazy.
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