Morris minor turbo(!?)
Turbo Mini Forums

Hi all,

I have possibly chosen the wrong place to post this as it could fit into various categories. A few months ago I posted a wanted add for a turbo to fit to my long-term restoration Morris Minor, which I will be fitting a mega-jolt and turbo too.

The car is heading off to the spray shop next week and I have been finally able to think about the engine build for the car. The plan for my 1275 engine build was to aim for around 90-100 BHP in order to make a fairly usable car but quick car. Based on the bits I've got basic set up was going to be 3-5psi boost using a GT17 turbo with a HIF44 carb and mega-jolt ignition. Does that sound reasonably sensible?

One of the things I am unsure of is what to do with pistons/engine compression ratio. I've got the choice of three engines in good condition to get me going. One being an A+ with a CR of 9.4:1, another being a standard marina A series with a CR of 8.4:1 (I think?) and another one being a low compression van engine with a CR of 8:1. Would any of these be suitable?

Whilst I understand standard pistons aren't the most durable I figured that a megajolt would prevent detention and melting of pistons? Or alternatively fitting an Intercooler(are these necessary at this level of boost?).

Alongside this I will be fitting bigger diameter valves and valve guides to the cylinder head.

The brakes, suspension, back axle and brakes have also been uprated.

Is there anything else that I am obviously missing?

Thanks

Will

The standard Metro turbo engine made 94bhp and was pretty reliable. So I'd keep the compression high and the boost low which should be plenty quick enough for your car.

I tend to agree but i might be tempted to make provision for an intercooler anyway as you will likely want more power at some point and it would be silly to run without one at higher boost levels.

The lower compression engines will allow higher boost but that will give a setup with less low down torque and more punch once the boot comes on. Its your decision really.

you need to do a bit more research on the pistons I think,

IIRC the standard A+ ones were fairly durable, and the LC van ones were made of cheese.

I would aim for about 9-1 compression, so even with those 9.4 ones you can just whip a bit out the chambers to get it where it needs to be,

I would Always run an intercooler, even if its tiny, as even somthing that looks pointless will be scrubbing off 20 degrees of heat, less heat, more advance/higher compression, better driveability etc... its just nicer :)

apart from that sounds bang on!

And Megajolt on its own does not prevent det or piston damage. It needs to be mapped as appropriate for your engine and it,s fuelling,best done on the rollers.

Thanks all for the helpful replies.

I should have mentioned that I will be getting the car tuned on a rolling road after getting it all set up.

It sounds like the best bet is the A+ engine then, and have a read up in Vizard regarding the suitability of the pistons.

The comments regarding the intercooler are sensible too and I'll have a look out for a small one, are there any off other cars that I are suitable?

I'll also need to fit an uprated oil pump, and change the exhaust valve guides. where can you get these from?

I THINK that's everything. Stay tuned for the inevitable questions in the coming weeks/months!

Cheers,

Will

oil pump, swiftune is a good bet, recently its been discovered that some pumps dont seal properly as theres not enough land area and can leak into the end cam journel, the swiftune is a known good one.

Guide wise, I wouldnt entertain doing them yourself as you need to cut the seats etc, I'd suggest getting a head from either Benross or turbophil, both do good work and are competitivly priced