Bore Scratches
09-10-2017, 06:24 AM
#41
Thread Starter
Well been a bit of a lull in progress but toby was over today and he started looking at gaping the new rings , decided he needed a fine wheel for the ring machine , so that's on order .
he took the oil pump apart , throughly cleaned it and checked all clearances , this engine having done 75k miles all the clearances are at the lower end of the new tolerances let alone in the service limit zone.
its fully cleaned now,ready to fit , wrapped in cling film
he took the oil pump apart , throughly cleaned it and checked all clearances , this engine having done 75k miles all the clearances are at the lower end of the new tolerances let alone in the service limit zone.
its fully cleaned now,ready to fit , wrapped in cling film
09-12-2017, 10:29 PM
#44
Member
You need a very expensive balancing machine to balance rotating assemblies! Something which can plot balance vectors and tell you where to remove weight.
09-12-2017, 11:02 PM
#45
Blueprinting, so getting all the same weight.
09-14-2017, 10:53 AM
#48
Thread Starter
As Toby says , the component data,sheets shows weights as measure to a very high level of accuracy .
we,did discuss end weighing the rods when we,thought about re using the Honda units , rods and pistons which often vary considerably .
Honda crank has clearly been balanced and adjust by Honda
I mean pleas the F20c is often like like. A bag of rusty spanners any way , it's not turbine smooth is it !
next problem he's looking at is ring gaps , lots of options depending on application , and many many opinions,, especially from key board mechanics !,,, as always
we,did discuss end weighing the rods when we,thought about re using the Honda units , rods and pistons which often vary considerably .
Honda crank has clearly been balanced and adjust by Honda
I mean pleas the F20c is often like like. A bag of rusty spanners any way , it's not turbine smooth is it !
next problem he's looking at is ring gaps , lots of options depending on application , and many many opinions,, especially from key board mechanics !,,, as always
09-15-2017, 02:48 AM
#49
lol, nope I wouldn't ever expect to use "F20C" and "turbine smooth " in the same sentence. I've never done a full engine rebuild of anything so awaiting the "ring gapping" episode with interest
09-29-2017, 01:18 AM
#50
Hi Rob,
Many thanks for showing me the engine a couple of nights ago.
One quick question concerning the block and tolerances: you mentioned the bearings in Toby's engine are within 0.001" of each other which is quite impressive!
However, when you separate and then reassemble the upper and lower blocks (and hence the two halves of the main bearing shells) what ensures that everything lines up? If they are not perfect then surely the bearing tolerance is compromised? That may sound like a daft question, so I'll ask it another way. Are the mating dowels which locate the upper and lower blocks together accurate enough to be confident that as the bolts are torqued the blocks are pulled into alignment sufficiently to ensure the main bearings shells all line up (in your case to 0.001")
Thanks for any advice.
Many thanks for showing me the engine a couple of nights ago.
One quick question concerning the block and tolerances: you mentioned the bearings in Toby's engine are within 0.001" of each other which is quite impressive!
However, when you separate and then reassemble the upper and lower blocks (and hence the two halves of the main bearing shells) what ensures that everything lines up? If they are not perfect then surely the bearing tolerance is compromised? That may sound like a daft question, so I'll ask it another way. Are the mating dowels which locate the upper and lower blocks together accurate enough to be confident that as the bolts are torqued the blocks are pulled into alignment sufficiently to ensure the main bearings shells all line up (in your case to 0.001")
Thanks for any advice.