3 replies to this topic

[rick1962uk]

hi all welding done and will be painted soon so im going to start rebinding the engine its a metro 1275 A+ lump single carb 

now power at the moment is not to important but for fast road / track days is there any important parts i need to change 

it will have a pre verto clutch and electric fuel pump just want to get the bottom end right first time 

also do these need a sump baffle or do they cope 

many thanks 

[DeadSquare]

Bottom end:-  A modified oil pick-up that is nearer the centre of the box is a useful mod,  Some people used to plug the holes in the centre web, but I never saw the point as oil can flow through the diff,

 

Have the crank / flywheel,rods and pistons balanced and an 1" square strap over the shaved centre main bearing cap.

 

Top end:-  fit a supercharger..

[rick1962uk]

Bottom end:-  A modified oil pick-up that is nearer the centre of the box is a useful mod,  Some people used to plug the holes in the centre web, but I never saw the point as oil can flow through the diff,

 

Have the crank / flywheel,rods and pistons balanced and an 1" square strap over the shaved centre main bearing cap.

 

Top end:-  fit a supercharger..

many thanks thats a great starting point

[Cooperman]

I would suggest, in addition to the centre main bearing cap strap, full balance of all rotating parts and a centre oil pick up that you consider the following:

Lightweight steel flywheel
A really well has-flowed big-valve head
A better cam to suit your application. Something like an SW5, Kent 276 or similar ( look at the cam graphs below deciding).
LCB exhaust manifold
Twin HS4 carbs
A matched distributor
Quality high comp pistons (MS Evo pistons are excellent)
A higher comp ratio.

Then you need to consider the final drive ratio. This is a personal choice, but suffice to say that it is a balance between acceleration and cruising speed. Maybe a 3.44:1 would be about right if you are keeping standard gear ratios. This gives around 16.5 mph/ 1000 rpm in top gear and great acceleration.
For overall performance the suspension is as important as the power and torque. But that’s another subject.
Also you might consider a Cross Pin Diff for reliability.