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Old 01-18-2015, 06:20 PM   #841
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Wow, whats the weight balance after the swap? 48-52 or something?
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Old 01-19-2015, 12:00 PM   #842
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Quote:
Originally Posted by emilio700 View Post
Based on some rough numbers I came up with, weight is about the same. Not enough to be a deciding factor IMO.

Andy, what were your before/after numbers?
It's at least 50 lbs lighter. So far customers are telling me they are saving at least 100 lbs total by completing the swap since they are doing some further weight reduction in the process (mainly A/C and P/S).

Last time we weighed our car (2000 NB) it was under 2300 lb.
K24
Full interior
OEM hard top
OEM soft top
Roll bar
Spec Miata seats
No spare tire
Almost full tank

Weight distribution is exactly 50/50

Emilio your car will most likely be the best back-to-back weight test.
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Old 01-19-2015, 04:41 PM   #843
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Quote:
Originally Posted by K Miata View Post
It's at least 50 lbs lighter. So far customers are telling me they are saving at least 100 lbs total by completing the swap since they are doing some further weight reduction in the process (mainly A/C and P/S).

Last time we weighed our car (2000 NB) it was under 2300 lb.
K24
Full interior
OEM hard top
OEM soft top
Roll bar
Spec Miata seats
No spare tire
Almost full tank

Weight distribution is exactly 50/50

Emilio your car will most likely be the best back-to-back weight test.
Yup, we're not changing anything other than the engine and swap kit. Car has no A/C, PS or emissions equipment as is.

That said, the dressed long blocks weight about the same so on paper at least, there should not be much of a difference. My guess is the alloy block being a full girdle type and the much taller head (because real ports) account for the disparity in block materials.
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Old 01-20-2015, 12:58 PM   #844
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Quote:
Originally Posted by K Miata View Post
It's at least 50 lbs lighter. So far customers are telling me they are saving at least 100 lbs total by completing the swap since they are doing some further weight reduction in the process (mainly A/C and P/S).
AC parts + power steering + emissions, the custom intake, subframe, cruise control, and header should add up to about 65lb in weight savings. If people are coming from a stock flywheel there is a big chunk of weight there as well. About 25lb difference between the two long blocks?
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Old 01-20-2015, 07:26 PM   #845
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Nb ac stuff is 32 lbs by itself.
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Old 02-08-2015, 04:29 PM   #846
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Andy, you should do a dedicated build thread for your car.
Finally did this. In addition to the FB page (OneLapMiata.com), I put the whole build-up on this forum.

https://www.miataturbo.net/general-m...2/#post1204024

The FB page gets a little hard to follow after awhile, so this will serve as a reference for others doing this build.
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Old 02-22-2015, 08:52 PM   #847
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Not looking good for hood clearance on an NA with K24. This is after the bracing is cut out in the affected areas... basically hood skin on valve cover.

Suggestions?

Current plan is to pull the valve cover and see how much room there is to shorten it.
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Old 02-22-2015, 08:54 PM   #848
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Quote:
Originally Posted by njn63 View Post
Not looking good for hood clearance on an NA with K24. This is after the bracing is cut out in the affected areas... basically hood skin on valve cover.

Suggestions?

Current plan is to pull the valve cover and see how much room there is to shorten it.
Sell me the K24a2 (a2?) for cheap and then go K20?

I have an X1/9 now that needs a K at some point in the future...
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Old 02-22-2015, 08:57 PM   #849
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13mm more stroke on the k24 but are the external dimensions different?
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Old 02-22-2015, 09:05 PM   #850
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Quote:
Originally Posted by njn63 View Post
Not looking good for hood clearance on an NA with K24. This is after the bracing is cut out in the affected areas... basically hood skin on valve cover.

Suggestions?

Current plan is to pull the valve cover and see how much room there is to shorten it.
Cowl Hood. Only solution.
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Old 02-22-2015, 09:12 PM   #851
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Cowl hood will require proper decal.


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Old 02-22-2015, 09:18 PM   #852
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Quote:
Originally Posted by asmasm View Post
13mm more stroke on the k24 but are the external dimensions different?
Deck height is ~20mm different.
Quote:
Originally Posted by Splitime View Post
Sell me the K24a2 (a2?) for cheap and then go K20?

I have an X1/9 now that needs a K at some point in the future...
06 K24A2.

It's basically a track only car so I have no problem going street rod and cutting a hole in the hood for it. Just keeping that as the last option.
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Old 02-22-2015, 09:34 PM   #853
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Quote:
Originally Posted by njn63 View Post
Deck height is ~20mm different.

06 K24A2.

It's basically a track only car so I have no problem going street rod and cutting a hole in the hood for it. Just keeping that as the last option.
Damn... (that I can't get it for cheap ) I'd see if you can find an old school metal guy to massage the metal up to clear it. Could do simple hammer attack... but old school hotrod guys could likely do it cleanly and then polish (heh) or repaint that area when the paint cracks during the work.
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Old 02-22-2015, 09:39 PM   #854
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Quote:
Originally Posted by njn63 View Post
Deck height is ~20mm different.

06 K24A2.

It's basically a track only car so I have no problem going street rod and cutting a hole in the hood for it. Just keeping that as the last option.
Shoot me an email, we already have custom valve covers that have better clearance in the front. I'll post some pics soon. Since you're local you can come pick one up to test fit. You can make the stock hood clear.
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Old 02-22-2015, 09:53 PM   #855
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You have an email.
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Old 02-24-2015, 01:07 AM   #856
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Quote:
Originally Posted by njn63 View Post
You have an email.
And here's a sample of the valve cover prototype.

Note that a K20 and K24 clear fine in an NB with no cutting of the hood skeleton.

K20 in NA should be fine with some trimming, and K24 in an NA requires some trimming and a modded valve cover, or a hole in the hood.

All things we are learning along the way!

edit: we have 5 of these valve covers being modded right now. We'll do a core exchange for our NA K24 customers starting in the next couple weeks. Haven't even gotten it on the website yet.
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Old 02-24-2015, 11:34 AM   #857
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Quote:
Originally Posted by Mobius View Post
Cowl hood will require proper decal.

Threadjack . . . but you guys HAVE to see this car:

The Bandit Is For Sale!!!! 2001 Spec Miata Vvt - Spec Miata Classifieds - Mazda Racers
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Old 02-24-2015, 11:45 AM   #858
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SO GOOD.

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Old 02-24-2015, 01:32 PM   #859
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Quote:
Originally Posted by K Miata View Post

Note that a K20 and K24 clear fine in an NB with no cutting of the hood skeleton.

K20 in NA should be fine with some trimming, and K24 in an NA requires some trimming and a modded valve cover, or a hole in the hood.
One more option for NA...

You can put a K24 into a K20 block. Requires either custom pistons or custom rods, but it is done frequently (especially by CRX owners).

Very stealth.
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Old 02-24-2015, 01:38 PM   #860
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but mah r/s ratio.
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