triple88a

iTrader: (2)

Wow, whats the weight balance after the swap? 48-52 or something?

KMiata

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.

emilio700

iTrader: (3)

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.

asmasm

iTrader: (1)

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?

Mobius

iTrader: (2)

Nb ac stuff is 32 lbs by itself.

AndyHollis

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.

njn63

iTrader: (4)

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.

Splitime

iTrader: (24)

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...

asmasm

iTrader: (1)

13mm more stroke on the k24 but are the external dimensions different?

aidandj

iTrader: (5)

Cowl Hood. Only solution.

Mobius

iTrader: (2)

Cowl hood will require proper decal.

njn63

iTrader: (4)

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.

Splitime

iTrader: (24)

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.

KMiata

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.

njn63

iTrader: (4)

You have an email.

KMiata

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.

hornetball

iTrader: (4)

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

The Bandit Is For Sale!!!! 2001 Spec Miata Vvt - Spec Miata Classifieds - Mazda Racers

concealer404

iTrader: (3)

SO GOOD.

AndyHollis

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.

Leafy

iTrader: (1)

but mah r/s ratio.