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Old 11-07-2013, 02:19 PM   #121
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... A stock head shifted at 8000rpm + would have a life span measured in minutes.
Cant wait to pull mine(100k+ junkyard bp4w) off this winter and have it looked at. Been running it to 8k for 2 DE4 seasons now. That hour-age might add up to half a race season for you guys?
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Old 11-07-2013, 02:32 PM   #122
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Cant wait to pull mine(100k+ junkyard bp4w) off this winter and have it looked at. Been running it to 8k for 2 DE4 seasons now. That hour-age might add up to half a race season for you guys?
A few things.

What tach were you reading from? OEM tach reads almost 200rpm high at 8000.

Why shift above 8000? Stock BP4W head make no power up there.

By "life", I mean still holding <3% leakdown. Still runs and starts but has 15-25% leakdown doesn't count. FWIW, tire BP's tend to run real smooth. Having an effective compression ratio down 1-2 pts from stock will do that.
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Old 11-07-2013, 04:55 PM   #123
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A few things.

What tach were you reading from? OEM tach reads almost 200rpm high at 8000.

Why shift above 8000? Stock BP4W head make no power up there.

By "life", I mean still holding <3% leakdown. Still runs and starts but has 15-25% leakdown doesn't count. FWIW, tire BP's tend to run real smooth. Having an effective compression ratio down 1-2 pts from stock will do that.
My honda manifold makes power there. But you're right, indicated 8k on factory tach. 1.9 bottom end with junkyard 4w head.
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Old 11-12-2013, 12:33 AM   #124
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We decided to do the CNC to stock head comparison with some short duration, medium lift cams. The cams are prototypes of a grind we may offer early next year. We chose to do the A/B with cams simply because there is a bigger difference in flow with cams. Duration should be short enough to idle like stockers but with oh, .060" more lift

Further down the road we may still run an A/B with stock cams.
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Old 11-12-2013, 02:34 AM   #125
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In for the results.
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Old 11-15-2013, 06:32 PM   #126
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Would it be possible to see stock vs cnc head vs cnc head with cams? When are you doing the testing? Going to update your 949 blog anytime soon?
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Old 11-15-2013, 06:58 PM   #127
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Would it be possible to see stock vs cnc head vs cnc head with cams? When are you doing the testing? Going to update your 949 blog anytime soon?
Not sure if serious..

We won't do the A/B/C you suggested. You'll just have to speculate, be angry, accuse me of various evils, whatever. We'll do A/B with the same custom cams.

Blog, ah. No time or motivation. Facebook really takes the place of the blog for me. I've been sitting on a few ideas for few thousand word essays on a few different auto-motorsport related topics that don't really have a home otherwise.
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Old 11-20-2013, 04:56 PM   #128
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Hello Emilio

Your CNC heads look amaizing. I will be looking forward to optional cams. I have been wanting to get head work and more agressive cams for my 2000 miata and have been researching what options are out there and the options are hard to find. I found your heads on 959 racing. And then found this thread. Might I suggest creating a youtube video of machining the head to get your product out there? and a group buy would be awsome.

Thanks
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Old 11-20-2013, 05:01 PM   #129
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959racing: New England race shop. Everything is rusted.
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Old 11-20-2013, 05:04 PM   #130
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959racing: New England race shop. Everything is rusted.
959 is still in cali. 603 Racing: Even our aluminum parts rust.
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Old 11-20-2013, 06:40 PM   #131
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959 is still in cali. 603 Racing: Even our aluminum parts rust.
Area codes 860 and 959 - Wikipedia, the free encyclopedia
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Old 11-20-2013, 06:40 PM   #132
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I'd be in for a group buy also.
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Old 11-20-2013, 06:42 PM   #133
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I'm down for 959Racing products.
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Old 11-20-2013, 06:48 PM   #134
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I'd be in for a group buy also.
We will offer the heads at the same relatively low price to everyone, whether you buy 1 or 10. GB's make sense if there is an additional economy from increased production volume, which their isn't with our CNC heads.

So, no GB's gentleman.
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Old 11-20-2013, 07:52 PM   #135
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Well then. I should have google harder.
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Old 11-21-2013, 04:31 AM   #136
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959 is still in cali. 603 Racing: Even our aluminum parts rust.
959 Racing:



--Ian
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Old 11-25-2013, 09:09 PM   #137
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Not sure if serious..

We won't do the A/B/C you suggested. You'll just have to speculate, be angry, accuse me of various evils, whatever. We'll do A/B with the same custom cams.

Blog, ah. No time or motivation. Facebook really takes the place of the blog for me. I've been sitting on a few ideas for few thousand word essays on a few different auto-motorsport related topics that don't really have a home otherwise.
I'm thinking about myself, I want a street legal SuperMiata. I thought you stated that the stock cams make the most torque at the lower "street" rpm. So are you now only selling the head with 949cams?
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Old 11-26-2013, 04:24 PM   #138
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I'm thinking about myself, I want a street legal SuperMiata. I thought you stated that the stock cams make the most torque at the lower "street" rpm. So are you now only selling the head with 949cams?
Stock cams for now. We're developing optional SuperMiata cams but those are many months away. If "street legal" means passing a sniffer, stick with stock cams. The two simple methods for getting big N/A street torque is displacement and head work. CNC BP6D big valve head, 1952cc displacement on Texas gas tuned to MBT and you'll see 145bs/ft @ 3500 guaranteed. As the stock NB makes more like 112lbs @4800, this is a huge gain and is a blast to drive. On E85 with ceramic coated everything, you're talking 160 lbs/ft @4000 and 180whp on stock cams.
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Old 11-26-2013, 04:33 PM   #139
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On E85 with ceramic coated everything, you're talking 160 lbs/ft @4000 and 180whp on stock cams.
Your Swain invoice must have been seriously impressive
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Old 11-26-2013, 04:58 PM   #140
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Your Swain invoice must have been seriously impressive
Wasn't Swain but yeah, coatings are not cheap.
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