MK1 mx5 engine swap

[Jake1313]

Hi guys got a bit of an odd one. I have a mk1 project and planning on putting a small block v8 in..because why not. And just wondering if anyone would be able to give me any ideas on a good rear axle???

[jazzybee]

I'm afraid I can't help - but would be very interested in details of your project... As I fancy having something similar built. What engine are you starting with? I was thinking of a Lexus 4 Litre with Toyota Supra gearbox combo I read about years ago... Alternatively a corvette LS engine. Others I have seen are Mustang and Rover V8s. It would be good to see what your thoughts are, and how the project progresses.

[Oldandslow]

See feef's thread for Lexus V8 build ongoing.

Don't know if it's compatible but people used to use RX7 rear ends for high torque turbo MX5s.

[Jake1313]

Iv looked at rover v8 and itl fit nicely with minimal cutting to the bulk head and tunnel. Alternatively i was thinking of running Ford small block and building the engine up. And thanks never thought about using a rx7 rear end, provided Itl be able to be adapted

[binnerboy]

not cheap but

https://www.flyinmiata.com/V8/index.php

[daveinhampshire]

Sorry to pick this up so late. I have a mk1 with a 3.5 Rover V8. It has a 323i differential, rover gearbox and an edelbrock 500 cfm carb. I've personally not found the rover v8 that quick, it certainly sounds amazing but I think a turbo would be quicker. I'm going for a mild 4.6 upgrade this winter, then it'll be nuts

[feef]

The MK2.5 limited slip diff is a surprisingly robust unit and is easily good enough for the 250-260 that I'm expecting my 1UZ to be putting out as stock.

AIUI, the axles are weaker than the diff, and RX7 units are a common replacement.

I'm going to stick with a stock rear end in the short term until I've got the engine fitted, fettled and 'troubleshooted' (troubleshot??) for a while and then consider rear end changes as I consider tuning upgrades for the engine.