Head to Head: NB1 vs. NB2, giving the best head
08-10-2017, 11:35 AM
#63
Junior Member
Join Date: Feb 2014
Location: Columbus, IN
Posts: 324
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Not sure if this is asking for an explanation of the terminology, or asking if RTC understands the terminology...either way, core shift refers to a phenomenon in the casting process where the core(s) (which define internal geometry of the casting, like flow passages) moves, or "shifts," relative to the cope and drag after they have been assembled and before the casting has been poured and solidified. This results in offset internal geometry relative to the outer geometry, which, in this case, means that cast passages that are supposed to line up will not line up as well. This is most prevalent in greensand casting because it's relatively soft and easily deformed. Other casting technologies involve a stronger binder that makes the cores and flask very rigid, and result in very repeatable and tight tolerance castings; however, it's a lot more expensive.
Anyway, better core design can result in less core shift and better finished castings.
"The more you know...."
Anyway, better core design can result in less core shift and better finished castings.
"The more you know...."
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08-10-2017, 01:16 PM
#64
Not sure if this is asking for an explanation of the terminology, or asking if RTC understands the terminology...either way, core shift refers to a phenomenon in the casting process where the core(s) (which define internal geometry of the casting, like flow passages) moves, or "shifts," relative to the cope and drag after they have been assembled and before the casting has been poured and solidified. This results in offset internal geometry relative to the outer geometry, which, in this case, means that cast passages that are supposed to line up will not line up as well. This is most prevalent in greensand casting because it's relatively soft and easily deformed. Other casting technologies involve a stronger binder that makes the cores and flask very rigid, and result in very repeatable and tight tolerance castings; however, it's a lot more expensive.
Anyway, better core design can result in less core shift and better finished castings.
"The more you know...."
Anyway, better core design can result in less core shift and better finished castings.
"The more you know...."
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08-10-2017, 07:51 PM
#70
Junior Member
Join Date: Aug 2009
Location: Lakewood (Green Mountain) CO.
Posts: 250
Total Cats: -63
And you are over 24 hours late to the party...
BTW, it's written as YOU ARE, or YOU'RE, I thought you'd might like to know...
BTW, it's written as YOU ARE, or YOU'RE, I thought you'd might like to know...
Then the MSM would have the BP4W + VCTS head?
https://en.wikipedia.org/wiki/Mazda_MX-5Mazdaspeed MX-5 (2004–2005)[[url=https://en.wikipedia.org/w/index.php?title=Mazda_MX-5&action=edit§ion=11]edit]
"2005 Lava Orange Mazdaspeed Miata next to a 2004 Velocity Red Mazdaspeed MiataThe 2004 model year saw the introduction of the official turbocharged Mazdaspeed MX-5, Roadster Turbo in Japan. It featured an IHI RHF5 VJ35 turbocharger equipped variant of the BP-4W engine that produced 178 bhp (133 kW) at 6500 rpm with a front-mounted air-to-air intercooler"
https://en.wikipedia.org/wiki/Mazda_MX-5Mazdaspeed MX-5 (2004–2005)[[url=https://en.wikipedia.org/w/index.php?title=Mazda_MX-5&action=edit§ion=11]edit]
![](https://www.miataturbo.net/"https://en.wikipedia.org/wiki/File:05_and_04_Mazdaspeed_Miata.jpg")
"2005 Lava Orange Mazdaspeed Miata next to a 2004 Velocity Red Mazdaspeed MiataThe 2004 model year saw the introduction of the official turbocharged Mazdaspeed MX-5, Roadster Turbo in Japan. It featured an IHI RHF5 VJ35 turbocharger equipped variant of the BP-4W engine that produced 178 bhp (133 kW) at 6500 rpm with a front-mounted air-to-air intercooler"
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08-10-2017, 07:59 PM
#73
Former Vendor
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It's on Wikipedia, it must be right
(the most accurate way to describe an MSM engine is as "a VVT engine with oil/coolant block ports, less compression, no VVT, and a BP5A cam")
(the most accurate way to describe an MSM engine is as "a VVT engine with oil/coolant block ports, less compression, no VVT, and a BP5A cam")
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08-10-2017, 08:44 PM
#74
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Join Date: Aug 2009
Location: Lakewood (Green Mountain) CO.
Posts: 250
Total Cats: -63
"The basic engine is essentially a 1999-00 one. Same head, slightly different cams, the oil pan and intake manifold from a 2001-05. It has oil drain and feed fittings and a tweak to the water pump inlet shape to clear the compressor inlet"
https://grassrootsmotorsports.com/fo...ta/6658/page1/
BTW, happy as a clam with the MS3 y'all sold me. That thing is sweet as peaches!
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08-10-2017, 09:28 PM
#78
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Ah, so my previous research was not of your liking. How about this, Keith Tanner. Would that be better?
"The basic engine is essentially a 1999-00 one. Same head, slightly different cams, the oil pan and intake manifold from a 2001-05. It has oil drain and feed fittings and a tweak to the water pump inlet shape to clear the compressor inlet"
"The basic engine is essentially a 1999-00 one. Same head, slightly different cams, the oil pan and intake manifold from a 2001-05. It has oil drain and feed fittings and a tweak to the water pump inlet shape to clear the compressor inlet"
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