Hello,
New to the forum but not the A-series.
I'm starting to plan the engine build for my Morris Minor (hope you Mini chaps don't mind) and have a few queries regarding component choice for a supercharged setup.
Engine is a 1275 Midget block with EN16T crank, planned spec is listed below.
1st question regards piston and con rod choice. I have three avenues in mind:
1. Original AEG625 rods lightened and polished, with Minispares MEGA pistons
2. Original AEG625 rods lightened and polished, with Omega cast pistons
3. Forged rods (SC, MED or Arrow) and Omega forged pistons
What sort of power and boost can each combination handle? I'm hoping for at least 120bhp, but ideally aiming for 150bhp+
At what bhp would the original rods become potentially unreliable?
The engine build is going to be expensive and it's going to be a road car, so reliability is key, even if it comes at additional original cost.
2nd question realtes to the power I can expect from the engine. Full proposed engine spec is below, but in brief it would be 1293 engine, Eaton M45 blowing through HIF44 with Podifold manifold. The space available in the Morris engine bay allows for fitment of a large IC which would hopefully overcome the inefficiencies of the Eaton at high boost.
What sort of boost figure is sensible assuming a large IC?
I've read numerous posts quoting quite low power figures from supercharged A-series, but most of these are suck through and not IC'd. I'm hoping blowing through and an IC will release greater potential from the SC.
I've read many an argument that suggests turbo has more potential than SC, and I know there are numerous easy ways to increase power in a Morris with engine swaps, but I am steadfast on sticking A-series and SC'd not turbo.
Any help much appreciated.
Proposed engine spec below:
All components to be uprated versions (valve guides, ARP bolts etc) and crank/rods/pistons/damper/flywheel to be balanced.
Head:
12G940
35.6/29.2 valves
DIY ported as per Vizard
CNC combustion chambers to lower CR
Rockers TBC
Manifolds to be matched to head
Block:
Bored +20 to 1293cc
EN16T crank, wedged and cross drilled
Steel main caps, inc. 4 bolt centre
Conrods TBC
Pistons TBC
Cam:
TBC
Ignition:
Aldon dizzy or mappable with crank pulley sensor
Fuel & Induction:
Eaton M45 super charger, blow through set up
HIF 44 carb
Podifold manifold
Intercooler
Potentially convert to injection at a later date
Exhaust:
Maniflow LCB
1.75" straight exhaust