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Old 08-14-2013, 01:33 PM   #1
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Default MSM cams in VVT Head?

I was planning on building my MSM motor but found a great deal on an 01' motor with VVT that I will be purchasing. I want to know if there is any reason the MSM cams would not work in a VVT motor if I swapped them over since they are slightly more aggressive from my understanding. Would this swap offer the benefits I am expecting?
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Old 08-14-2013, 01:40 PM   #2
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Interesting question.

I know for sure that VVT intake cam has a nub on the end for the CAM sensor, which is no other cams have. You can probably work around that.

I'm not aware of any other reason why they wouldn't fit, but its possible that the VVT actuator has something to do with it.



edit: yeah the VVT intake cam has screw holes for actuator mounting on it and sticks out a lot further.


More pictures:
https://www.miataturbo.net/engine-pe...84/#post319719
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Old 08-14-2013, 01:42 PM   #3
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I actually only think the exhaust cam on the MSM is more aggressive so I don't think that is a big deal.
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Old 08-14-2013, 01:50 PM   #4
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Quote:
Originally Posted by soviet View Post
Interesting question.

I know for sure that VVT intake cam has a nub on the end for the CAM sensor, which is no other cams have. You can probably work around that.

I'm not aware of any other reason why they wouldn't fit, but its possible that the VVT actuator has something to do with it.



edit: yeah the VVT intake cam has screw holes for actuator mounting on it and sticks out a lot further.


More pictures:
https://www.miataturbo.net/engine-pe...84/#post319719
I have heard of motor parts being called boat anchors, but was that head actually used as a boat anchor?
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Old 08-14-2013, 02:04 PM   #5
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So I read that thread you linked soviet and I saw a whole lot of speculation but did not see any actual tested results. It is also incredibly old and I assume that someone has tried this in the past 5 years. I was thinking Savington or Emilio would have done this or atleast figured out if it would work.
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Old 08-14-2013, 02:10 PM   #6
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Very intersting question indeed.

I'm hoping someone has good info on this. (or you try it and report back )
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Old 08-14-2013, 02:13 PM   #7
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Quote:
Originally Posted by Ryan_G View Post
I actually only think the exhaust cam on the MSM is more aggressive so I don't think that is a big deal.
And here I was thinking the BP5A intake cam was the hot ticket for non-VVT builds as an OEM solution.
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Old 08-14-2013, 02:14 PM   #8
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If I get no answer and it fits the motor with no problems I will be more than happy to dyno test this thing.
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Old 08-14-2013, 02:15 PM   #9
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Exhaust cams are identical for all 99-05 motors including the MSM AFAIK.

VVT intake cams are unique and cannot be interchanged with BP4W or BP5A cams. The #1 journal has a significantly larger diameter.
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Old 08-14-2013, 02:19 PM   #10
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Thank you for the response Savington. That is just the info I needed.
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Old 08-14-2013, 03:06 PM   #11
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Quote:
Originally Posted by Ryan_G View Post
Would this swap offer the benefits I am expecting?
by removing the cam sensor and VVT abilities? I wouldn't call those benefits.
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Old 08-14-2013, 03:22 PM   #12
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Quote:
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by removing the cam sensor and VVT abilities? I wouldn't call those benefits.
I think the monumental oil leak and oil pressure loss that would result from the mismatched journal diameter outshines the issues created by a lack of cam sensor/VVT.
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Old 08-14-2013, 03:32 PM   #13
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He should swap in a 1.6L and buy a B6T turbo manifold.
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Old 08-14-2013, 04:00 PM   #14
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Quote:
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He should swap in a 1.6L and buy a B6T turbo manifold.
I hear they're all over the junkyards
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Old 08-14-2013, 04:31 PM   #15
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Quote:
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I hear they're all over the junkyards
That's where I found my 3.63, 3.30, and 5.22 rear ends.
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Old 08-14-2013, 04:32 PM   #16
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