I've Really Killed My MX-5 This Time, So This Is The New Grand Plan

My famous little MX-5 has been through the mill lately, and this time, it looks like Phil's engine really is dead. So here's my new grand plan...
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If you’ve been following the popular Project MX-5 series on our YouTube channel, you’ll know that Phil, my trusty, turbocharged steed has had a tough time of it in recent months. After getting turbocharged and gaining almost double the power, a lot of extra strain has been put through the old 1.8-litre BP-ZE engine, which resulted in blown oil seals while at the Nurburgring and general rough running.

Rescuing Phil from the Nurburgring
Rescuing Phil from the Nurburgring

After rescuing Phil from the ‘Ring and getting the seals replaced, boost pressure was then upped (see video above) and I drove away (with a very angry-sounding clutch) with over 250bhp at the crank. ‘Great’, I thought, ‘this is now one of the fastest MX-5s in the country’. (Not the fastest by any stretch of the imagination, but still damn quick).

Well, after trying to start little old Phil up the week before last, I heard a loud bang coming from under the bonnet, which sounded as though a heavy piece of metal had fallen to the ground and through my heart like a Hummer-punch that inextricably imploded my world, tied me up and buried me underground with 100kgs of TNT, a lighter and 10 crocodiles that hadn’t eaten for 1000 years…

The engine cut out immediately, and since then, Phil has been in hibernation. Again.

252hp at the crank was eventually too much for Phil to handle...
252hp at the crank was eventually too much for Phil to handle...

Until my buddy Gareth and I strip the engine and take a look, I won’t know what the damage is, to either the engine or the turbo. But one thing’s for sure: Phil is/was/will be again my daily and I’m all through with him being less than reliable. So there’s only one thing for it…an engine swap!

Tom's Turbo Garage: LS3 V8 Miata Build - Project Thunderbolt
Tom's Turbo Garage: LS3 V8 Miata Build - Project Thunderbolt

So then, what are my options? Well, V8 swaps are popular, but I don’t fancy going down that road, partly because of our insane fuel prices (did you know that we pay approximately $9 per gallon in the UK?!), coupled with the fact that the MX-5’s fuel tank is pretty small, meaning more regular fill-ups, and ain’t nobody got time for that!

You guys are also crying out for me to look into a rotary swap, which would keep the car Mazda pure, but again, it’s not something that grabs me because reliability and smooth running is very important to me.

What does really appeal to me is a six cylinder engine. Naturally, a BMW M52 2.8-litre engine is right up my street, but without cutting into the firewall and massive fabrication, it’s not feasible on a budget.

Could the MX-6's 2.5 V6 be Phil's new heart?
Could the MX-6's 2.5 V6 be Phil's new heart?

After some digging on the internet and conversations with MX-5 friends, I’ve discovered that a Mazda-sourced V6 would work very nicely indeed. The 2.5-litre KL engine as fitted to the Mazda MX-6 and Ford Probe GT would also keep the car in the Mazda bloodline, and would provide great power (around 200hp), reliability, and an engine and exhaust note sweet enough to do really bad things to.

Here’s a short video of one such car that already has the V6 swap, to give you a little taster of what may be coming to the Project MX-5 series in the next few months…

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So to all of you who ask me how Phil is and what the plan is, this is your answer. Obviously, however, it’s very early days, but I’m excited at the prospect of maybe having a V6 MX-5 as a daily.

What are your thoughts, and what other options should I consider?

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Comments

Anonymous

It would be nice to see a Mazda 2.3l MZR turbo engine in it but not sure how you would convert it to rwd. Maybe make it the first mid/rear engine Miata?

08/25/2016 - 23:15 |
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I've Really Killed My MX-5 This Time, So This Is The New Grand Plan
Edu Doffi

Build a 4 rotor mx5 - so you´ll have the best of both worl, rotary engine aaand sun in your head :P
Looking forward on this project

08/25/2016 - 23:15 |
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SirSonicSlipper

I’d be more tempted by the Mazda MX3’s 1.8 v6 (k8) as it wont make the car as heavy on the nose.

08/25/2016 - 23:22 |
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The 2.5s are actually very light engines

08/26/2016 - 11:02 |
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Anonymous

LS Swapped Miatas actually get pretty good gas mileage (for what I have read around mid 20s MPG (US) mixed, up to Low 30s on the highway!), especially newer ones with Variable Valve Timing and Cylinder Deactivation. Just Saying

08/25/2016 - 23:35 |
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José Carlos Gonzalez Ogando

won´t the 2.5l v6 from a mondeo SVT fit under phils bonnet?

08/25/2016 - 23:39 |
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There’s also a 3.0 V6 I should look into. Good shout :)

08/26/2016 - 11:01 |
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Anonymous

Just create Phil Collins by salvaging whatever you can from Phil and Collin.

08/25/2016 - 23:45 |
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Wiktor Pa

sr20det …… ;)

08/25/2016 - 23:50 |
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Anonymous

Most of the $ of a swap is not in the initial cost of the engine/trans, but in all the other bits. It’s hard to justify spending that kind of time/effort/money into a lack luster V6. Toss a LS1/t56 into Phil and really enjoy. Gas mileage can easily be around 30mpg in a lightweight car like Phil so long as you keep your foot out of the go pedal on your daily cruises.

08/26/2016 - 00:24 |
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I've Really Killed My MX-5 This Time, So This Is The New Grand Plan
bryce_nb1

Why not just build a bp motor I’ve seen built motors that push more than 450 whp so whp try to swap in a motor when The bp motors can easily put out more than enough power

08/26/2016 - 00:24 |
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I’m not chasing bhp figures any more. Want something super-reliable with around 250hp that sounds like thunder :)

08/26/2016 - 11:00 |
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Anonymous

Yes! Major fan of the 2.5L as Ive owned many Probe GTs. Awesome choice!

08/26/2016 - 00:33 |
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