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Miata crank in A-series block?
No life (a.k.a. DattoMaster)
Joined:
2002/11/26 0:38
From Las Vegas USA
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So while researching some motor parts I noticed that 1.6 Miata crank journal dimensions are very close to A-Series. Also knowing that the bore centers are the same because of the twin cam head project thread it got me thinking would a Miata crank fit?

Mazda stroke is 83.50 and piston pin height is 32mm, rod length is 133mm so if it did fit you need mill 2.75mm off the piston crown. You can also get 78.75mm pistons.

We actually have a spare 1.6 Mazda engine that came with my son's Miata as well as a spare A15. I've got 9000 to dos so it could be decades before I got to it.

It's an intriguing thought that in reality wouldn't be that simple but ijust putting it out there.

Posted on: 2017/11/30 6:46
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Re: Miata crank in A-series block?
No life (a.k.a. DattoMaster)
Joined:
2002/10/28 6:49
From Melbored
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Id say its quite possible since ford crossflow ohv guys use the L18 and L20b crankshaft
machined down to suit the ford bearings. Lemonhead I think used an e16 crank with a
sleeved A14/A15 block, either E series rods or custom with 82.5mm bores which his
engine machining guy said could go to 83mm bores reaching 1905cc.

Posted on: 2017/11/30 13:04
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Re: Miata crank in A-series block?
No life (a.k.a. DattoMaster)
Joined:
2002/10/28 6:49
From Melbored
Group:
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Posts: 9960
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Just a pointer on the E16 crank is I could be wrong but
the snout is smaller so will need a sleeve to fit the
A series timing pulley but can be overcome using the
Mazda kit as the Z series head has smaller belt pulleys
with slightly smaller diameter than A series.
The Z series head is like a narrow valved modern bike
head with 22 or 23 degree valve angles and awakened
when using different camshafts than factory econo ones.

https://www.miataturbo.net/attachments ... 2.jpg?dateline=1326189600

https://www.miataturbo.net/build-threa ... zm-de-engine-build-62722/

Posted on: 2017/12/1 0:23

Edited by D on 2017/12/1 2:41:31
Edited by D on 2017/12/1 2:45:49
_________________
https://www.youtube.com/watch?v=FEheU28ea3c
Give me control of a nations money supply and I care not who makes the laws - Mayer Amschel Rothschild

Politics not the oldest profession yet same result http://www.anarchistmedia.org/pdf/The-Anzac-Myth.pdf
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