LiamP
Paid Member
Merry Christmas everyone! Picked up the block a few weeks ago but wasn’t until Christmas Eve that I have actually had a day free to get started. She is now bored and honed out to 83mm so removing the out of round/tolerance that I had previously ignored. With time on my side I have taken advantage of autodoc and got an order with all seals/gaskets/bearings/bolts.
New pistons arrived that are now balanced to 0.5g, I could get them closer but I was wary of taking too much material off with the Dremel. For those interested the pistons/rods are 250g lighter than stock so its another kilo taken off the rotating assembly, in total I think I must be close to over 5.5kg off stock.
Pistons/rods: 1kg
Flywheel: 1.7kg
Exhaust Pulley: 0.8kg
Damper: 2kg
Total: 5.5kg
Dry build on the crank to check clearances and thrust, I was confident in the journal sizing so this was just to confirm the new bearings were correct.
Piston rings gapped as per NA spec and everything tripled cleaned before bolting together.
Splashed out on a tapered piston ring compressor, worth every penny of the £45 as it went from an hours job to 10 seconds to get the pistons in.
The Wossner pistons have a slightly different design on the bottom of the piston so there are clearance issues with the piston jets. I had anticipated this so hadn’t torqued the crank allowing me to modify without the crank in the way.
Big end clearance and lateral thrust all checked and within spec, using King Racing bearings this time due to the notch in the big end.
Oil pump then bolted on along with sump and the bottom end is now done, I should hopefully get some time after New Years to get the top end bolted up and she should be ready before the end of Jan.
New pistons arrived that are now balanced to 0.5g, I could get them closer but I was wary of taking too much material off with the Dremel. For those interested the pistons/rods are 250g lighter than stock so its another kilo taken off the rotating assembly, in total I think I must be close to over 5.5kg off stock.
Pistons/rods: 1kg
Flywheel: 1.7kg
Exhaust Pulley: 0.8kg
Damper: 2kg
Total: 5.5kg
Dry build on the crank to check clearances and thrust, I was confident in the journal sizing so this was just to confirm the new bearings were correct.
Piston rings gapped as per NA spec and everything tripled cleaned before bolting together.
Splashed out on a tapered piston ring compressor, worth every penny of the £45 as it went from an hours job to 10 seconds to get the pistons in.
The Wossner pistons have a slightly different design on the bottom of the piston so there are clearance issues with the piston jets. I had anticipated this so hadn’t torqued the crank allowing me to modify without the crank in the way.
Big end clearance and lateral thrust all checked and within spec, using King Racing bearings this time due to the notch in the big end.
Oil pump then bolted on along with sump and the bottom end is now done, I should hopefully get some time after New Years to get the top end bolted up and she should be ready before the end of Jan.
