Because CNC
11-07-2013, 01:19 PM
#121
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Join Date: Feb 2007
Location: Columbus, OH
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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?
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11-07-2013, 01:32 PM
#122
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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11-07-2013, 03:55 PM
#123
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Join Date: Feb 2007
Location: Columbus, OH
Posts: 1,533
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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.
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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11-11-2013, 11:33 PM
#124
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.
Further down the road we may still run an A/B with stock cams.
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11-15-2013, 05:58 PM
#127
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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11-20-2013, 03:56 PM
#128
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Join Date: Nov 2013
Posts: 2
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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
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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11-20-2013, 05:40 PM
#131
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11-25-2013, 08:09 PM
#137
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Join Date: Jul 2007
Location: Houston, TX
Posts: 3,201
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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.
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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11-26-2013, 03:24 PM
#138
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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