MX5 NB and Sigma

[voucht]

Hi,

Does anyone know if the MX5 NB 1800 engine has a "Sigma" gear box fitting bolt pattern (same as Duratec and Ecoboost)

There is an MX5 NB gear box from 2000 for sale not too far from where I live.
https://www.leboncoin.fr/voitures/14...4.htm/?ca=12_s

As I plan to upgrade my Roadster with an 1.6L 4 cylinder Ecoboost engine, if the gearbox is a direct fit, it might make things easier.

Also, how many HP can this gearbox take? According to the version, 1.6L Ecoboost can go up to 180HP.

Thanks.

[PorkChop]

Afraid not Sylvain - you need a mark 3 / NC MX5 gearbox.

Someone might be selling one if you fancy going to Stoneleigh next month

An NC box should take the power/torque of an Ecoboost - the NC Supercup race cars are about 180bhp (but would likely be less torque than a 180bhp Ecoboost).

An NA / NB box is rated for about 250bhp (for a 5 speed) and a bit more for the vastly more expensive 6 speed.

[voucht]

Thanks a lot for the answer. That clarifies a lot to me.
There is no emergency or hurry, it was just because there is an opportunity for an 2nd hand NB gearbox here, but I'm sure I will find something when the time to swap the engine comes.
Thanks you

[jps]

When Ford made that Formula Ford 'road car' with the Ecoboost several years ago I posted on Locostbuilders asking whether it was a 7-able powerplant for the future. There were lots of posts at the time saying it was a really tall engine and so probably no good....

Does it turn out it fits afterall?

[voucht]

Yes, I remember that thread.
Honestly, I can't tell if it will fit for sure, as I don't even have the engine yet . What I know is my 2.0i DOHC Sierra engine is already pretty tall.
Also, people replying on LCB are mostly locost/westfield/tiger/etc. builders, with much smaller chassis than the Haynes Roadster, so they can be scared by a tell engine that won't fit their tiny engine bays, but might be able to fit in a Haynes.
I also know that someone on LCB is making the swap to an Ecoboost, but I don't remember what car he has. It is worth a search on LCB.

[jps]

Originally Posted by voucht

Yes, I remember that thread.
Honestly, I can't tell if it will fit for sure, as I don't even have the engine yet . What I know is my 2.0i DOHC Sierra engine is already pretty tall.
Also, people replying on LCB are mostly locost/westfield/tiger/etc. builders, with much smaller chassis than the Haynes Roadster, so they can be scared by a tell engine that won't fit their tiny engine bays, but might be able to fit in a Haynes.
I also know that someone on LCB is making the swap to an Ecoboost, but I don't remember what car he has. It is worth a search on LCB.

Completely off topic but I was at the first 'closed public roads' rally in England last weekend, just a few miles from where I live. (Coming from mainland Europe you may think it daft we have never done this before.... )But I was talking to a co-driver from a Darrian (finished 3rd overall I think in the end) - he said they'd just taken a 2.5ltr Millington engine out to be replaced by a 1.6 EcoBoost based turbo engine and it's v. interesting to read that article saying it has 'standard' internals to won't need regular rebuilds. That's in a serious competition car - his peers will think nothing of an engine rebuild after a few events...!