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Old 11-29-2009, 02:05 AM   #41
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There is a reason alright, nobody uses a big camshaft. The miata head flows better than some NASCAR heads. He was man enough to get the combination right and not use a ***** cam.
Are you on crack

The BP does not have a good flowing head, It is extremely naive to think it is compared to many modern engines. The BP is fundamentally designed to be a torquey turbocharged engine, the rod ratio alone shows how the engine was never intended for high rpm use. You wanna see a good example of a production high flowing naturally aspirated head go look at a honda F22C, now thats a head that flows.

NASCAR engines are capable of 200+psi BMEP, the fact that you think the heads are even comparable is laughable
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Old 11-29-2009, 11:17 AM   #42
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Are you on crack

The BP does not have a good flowing head, It is extremely naive to think it is compared to many modern engines. The BP is fundamentally designed to be a torquey turbocharged engine, the rod ratio alone shows how the engine was never intended for high rpm use. You wanna see a good example of a production high flowing naturally aspirated head go look at a honda F22C, now thats a head that flows.

NASCAR engines are capable of 200+psi BMEP, the fact that you think the heads are even comparable is laughable
Still a 2 valve head. Considering the bp's bore size, it is pretty damn good. I have seen flow numbers from developed BP heads out flow some of the Nascar heads that are a few years old.

I did not compare it to a stock four valve Honda head. We are not using Honda engines, we are using bp engines.

My comments are to encourage motor development, which is sorely needed around here. Do you suggest that we just live with the limitations of the bp, or go and fix them.
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Old 11-29-2009, 11:23 AM   #43
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My comments are to encourage motor development, which is sorely needed around here. Do you suggest that we just live with the limitations of the bp, or go and fix them.
I'd love to see a few links to threads which indicate a "sore need" for engine development.
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Old 11-29-2009, 12:40 PM   #44
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I'd love to see a few links to threads which indicate a "sore need" for engine development.
Maybe he wants us to all run carbs, too.
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Old 11-29-2009, 01:35 PM   #45
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wait omg i thot carbz were bettr?
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Old 11-29-2009, 01:49 PM   #46
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Do you suggest that we just live with the limitations of the bp, or go and fix them.
My observations: The overall approach of the builds at this site, with some exceptions, is about getting the most power for the money.

The Miata crank is bulletproof, the block is strong, the block to head interface is stout, good rods and pistons are readily available, there are several good options for exhaust manifolds, and the exhaust itself is well sorted. Lots have developed solutions for the intake, from gutting the stock manifold to a full custom unit. ECUs are also taken care of, several flavors to choose from.

So that pretty much just leaves the head. Oversize valves are already available. Springs are already available. VVT is being experimented with. Static cam timing tuning has been done. So that pretty much leaves porting and cam profiles. Head porting and the like are nice, but from what I have seen they are pretty expensive to get done professionally and/or properly. I have seen some play with cams but not many.

Clearly the builder in the linked thread spent an insane amount of money on his motor, and is not running pump gas. I think it is well beyond what most want to do here. For insane power levels, a V8 swap is overall a cheaper and more bulletproof option if one is trying to get above 300-400 RWHP.

So in my mind the above explain why no one is sinking large amounts of cash into head work and/or cam profile experimentation. It is easier and cheaper to build a stout motor and turn up the boost.
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Old 11-29-2009, 03:08 PM   #47
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This miata2slow guy is quite amusing!!
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Old 12-01-2009, 12:39 PM   #48
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Unfortunetaly this engine wasn't that bulletproof. Rumors say that the engine exploded during performance measurings a week ago.
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Old 12-01-2009, 01:11 PM   #49
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Man, if I sunk that much money into a motor and blew it up...
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Old 12-01-2009, 01:38 PM   #50
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My guess is "that much money" means a lot less to him than to most of the forum.
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Old 12-01-2009, 04:43 PM   #51
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Cliffs: Most of us are either too poor or not interested in spending $25k in upgrades to our $2-10k cars. Most of us are not street racing from 50 to 150mph in a straight line in our cars and can't effectively use a car tailor built for that purpose to do what we are doing. But we like and admire the ability of others to build such wonderful and capable toys.
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Old 12-03-2009, 02:57 PM   #52
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Originally Posted by MartinezA92 View Post
wait omg i thot carbz were bettr?
for sure bro my dad's friend has a car w carbs runnin FIVE HUNNURRRRD HURSEPOWER runs 7s in the quarter fo real
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