34 replies to this topic

[holmesy]

does this sound good from jonspeed for £1550 fully built? any ideas of what power and torque i would expect?


1310cc Stage 2 engine
10.5:1 compression ratio
AE 21253 +.040 Cast pistons
Crankshaft reground, new Vandervell comp bearings and thrusts
A+ Conrods balanced
Kent megadyne 286, steel faced oil pump & duplex timing chain kit
Stage 2 ported and polished cylinder head with bosses removed, 35.5mm inlet, 29mm exhaust triple collet valves fitted with 185lbs double valve springs
Turbo verto clutch assembly
Rebuilt gearbox using all new bearings, baulk rings, choice of final drive ratio, uprated diff pin & central oil pickup pipe

[ACDodd]

I would have thought it would be good for 92 to 95bhp @ flywheel with a single HIF44 carb and a sensible manifolds/exhaust/correctly run in a tuned properly. You might find the clutch is marginal with that spec engine.

AC

[OfMini&Men]

Mega jolt and adjustable timing would give you a bit more

also could look at vizards book on tuning carbs up :)

[holmesy]

will be used with my hiff 44 on a polished alloy inlet with maniflow lcb. what's wrong with the clutch?

[holmesy]

would love megajolt and vernier gear but that 1550 is 550 more than I like to be spending

[ACDodd]

The engine would be powerful enough to make the clutch slip when worked hard in my experience.

AC

[OfMini&Men]

The engine would be powerful enough to make the clutch slip when worked hard in my experience.

AC

In theory you can make any clutch slip when worked hard.

[bmcecosse]

The valve springs are far too high poundage. You could DIY a similar spec for your £1000.

[holmesy]

i would like to build one but need an engine as soon as possible as its my only car that i can drive at the moment

[racingbob]

why a 286 id be going for a 266 or 276 cam

you dont say engine is fully balanced

which in my opinion needs doing putting in a 286

its only a stage 2 head 266 276 be better

mines only got mg metro cam with stage 3 head

and its great to drive

[carbon]

+1 on RacingBob's comment about using a 266 or 276, and also Roy's comment about not using heavier springs than needed as these sap power.

If it's your daily driver then I strongly recommend the 266 with 1275 motor. If you're looking for a bit more grunt at the top end then the 266 with higher lift rockers works well.

I don't know how much power this would be down on the 286, but the torque up to about 2500rpm will be much stronger with the 266, where it's useful in traffic.

And the 266 will give you much better mileage.

[holmesy]

re ground crank nitro carburised, balanced assembly, steel centre main strap. I have a 286 in the engine at the moment with the small valve head slightly ported by me and it's great so can't see why it wouldn't work with a much better head but please put your views and opinions as that's what I'm after and will take into consideration

[Cooperman]

For a 286 to give its maximum potential you need to keep the revs between about 5000 rpm and 6700 rpm. It won't pull very cleanly below around 3000 rpm, and at that it'll have less torque and power than a 266/MG Metro cam at 3000 rpm.
In turn that means a lower final drive ratio is needed which will reduce cruising speed, or put the same cruising speed at higher revs.
And yes, you'll need a stronger clutch diaphragm.
A 286 is a far from ideal road cam due to the high revs needed to make it work. With a 286 the engine will need rebuilding much more often due to the high wear rate caused by the constant high revs.

Edited by Cooperman, 20 December 2012 - 10:24 PM.

[holmesy]

last me a couple of years?

[CityCharlie]

You chaps speak of Megajolt. Would the 123Ignition distributor not be an option in this case?