Posted 20 January 2008 - 11:50 AM
Posted 20 January 2008 - 12:04 PM
You can get an A series up to 1399 cc's if you can find some 74mm pistons, to get bigger than that you need to alter the crank which is a whole new expense.
Obviously bigger engines make more torque which can effect reliability but the quality of the build and reinforcing things like the centre main bearing cap will matter more.
Posted 20 January 2008 - 12:47 PM
So they cost a load more for the trick long crank.
People tend to go 1380 as the part are easily avalibe. Go weird like 1293.
Posted 20 January 2008 - 04:57 PM
Oh and THE biggest problem, is finding some decent 74mm pistons, unless you want to spend £450 on a set of forged pistons, which is over kill on a road engine.
Posted 20 January 2008 - 05:07 PM
apart from the headgasket which has gone twice in two years (£15 for a good gasket and a day to change) i havent had a problem with the engine at all!
however the extra strain put onto the other components ie starter motor, alternator, cooling system, ignition etc is a lot more due too the extra power and torque, becuase of this or maybe because of the age of them, i have had them fail on me.
the thinner bore walls could be a problem, just let it warm up good before you put the boot down!
if the engine is built properly maintained well and generally well looked after there shouldnt be a problem!
Posted 20 January 2008 - 05:45 PM
The other thing which now no one has pointed out yet, (assuming 73.5mm is the largest your going to bore a block to), is that you can't rebore that block anymore, if for whatever reason you need to rebore, you'll need to find a whole new block.
Posted 20 January 2008 - 07:25 PM
Posted 20 January 2008 - 09:28 PM
Posted 20 January 2008 - 10:01 PM
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