1972 Rover P6 2300TC - Saab B234 Turbo

I think the standard Rover ECU and loom can be retained, it's just not my thing. To me the Megajolt is an investment, it can be lifted from one engine or car and put in another, plug a computer into it, change some settings and off you go again. I think Megasquirt and the other standalone aftermarket ECU's are the same, and even second hand, they appear to retain some value.

Then there's the improvement in performance over distributers, which over the years I've had no end of trouble with, causing poor starting, missfires, flatspots, reliance on stock ignition curves etc...

I now have control of the ignition curve and rev limiter, here's my previous ignition map, which had a little pinking at high load, mid-rpm, and has since been tidied up after a data-logging session on my daily commute ;D



Power delivery is smooth through all gears, and is perfectly driveable off boost, quite happily keeping up with general traffic, well worth the investment

The M-series pistons cleaned up well with white spirit and scotchbright, and are far better condition than the T-series pistons I've removed, with next to no scoring on the skirt:



It still amazes me that I was able to score a cheap engine, with the better rods, and correct grade A pistons to drop straight in, and here's the difference between the two, T on the left, M on the right:



While the engine was apart, I stripped the turbo down again to replace the old heatshield, I've been meaning to do it for the last half year, one less part to loose on the shelf



The bores have been given a quick de-glaze, I'm not expecting the engine to last 100k miles, I'd be happy with a trouble free 10k miles, as I'll get bored before long and want to change it again inevitably ;D





Normally I've tried to avoid engines with cambelts, preferring timing chains as I trust those better, but in this instance the quickness that the engine can come apart and go back together does make sense:



So now all I need to do is put the exhaust and turbo back on, drop the radiator and intercooler on with their pipework, pour some oil in the sump, and wait for the postman to deliver the fuel swirl pot then I'm back on the road ;D

I decided to have the turbo 'core' refurbished, so sent it off, and while I was waiting for it to return, I took the downpipe and silencer lump off for a few minor 'tweaks'

I cut one side off the silencer I fabricated years ago for the twin pipe outlets, and proceeded to hack out as much of the baffling as I could get to with the angle grinder, hammer and chisel!





Not pretty, but it's now a clear run with minimal restrictions after the turbo. To make it easier to remove and modify/adapt in the future, I made some flanges and cut through the exhaust by the gearbox, then welded the flanges in and bolted the exhaust back on:



The turbo recently arrived through the post, all nice and shiny and ready to go back on:





I assembled the cold side off the car, roughly lining it up, then placed the core assembly back on the exhaust housing which was still attached to the manifold and downpipe:





Without the baffles in the exhaust it sounds a little deeper and louder now



All I need to do now is carefully run it in, trying not to glaze the bores again, but the first few drives I've done since the rebuild indicate there is little or no smoke coming from the exhaust. Time will tell what the oil consumption is.

Wouldn't this airbox restrict the airflow to the carbs somewhat? You may be better off removing the trumpets, or fit shorter ones:

Updates?

Ooooh, Supercharger power? A combination of the two or simply a change in the type of forced induction?

Compound like Claymore's Volvo, it simply isn't loud enough yet

A different engine family will be used, I'm held up on the bellhousing adapter and a few other small clearance problems, but nothing major. It doesn't help that the P6 still works well, whilst I've got to bring my Discovery in for some significant body welding repairs now and my 75 is showing it's age and mileage

Ooo if it's anything like the Volvo this should be an absolute beast!

But different engine family eh?.. does this mean there will be an M16 engine going spare?... I've got a vaguely M16 shaped hole in the MG thats unfortunately filled with B series at the moment

Twin blowers? cool!