Crankshaft/flywheel dowels

[martinbrowning]

Hi allo,

I have recently taken delivery of a brand new Farndon crank from QED. This evening I was putting the crank/flywheel/clutch together in readiness for balancing tomorrow at a local engine builders.
The new crank has, in addition to the 6 threaded bolt holes for the flywheel, 2 dowels (not fitted, but supplied). My old crank doesn't have these dowels and the flywheel doesn't have holes for them. I can't see any reference to them in either the Lotus workshop manual, Miles' Twin cam book, or Brians book.

Any thoughts please?

Martin B

[garyeanderson]

elan-f15/flywheel-allignment-t24644.html

this topic discusses some of what was stock on the 6 bolt and 4 bolt cranks.

Gary

[martinbrowning]

Many thanks Gary - a really informative link which seems to draw me to the conclusion that I should just "go with what I have".

Martin B

[AHM]

Martin,

Make sure that the person doing the balancing adds an allignment mark - There isn't one and you have to guess when you build the engine which of the 4/6 positions is correct, and assume that the balancer made the same guess.

Simon

[bcmc33]

Martin,

Make sure that the person doing the balancing adds an allignment mark - There isn't one and you have to guess when you build the engine which of the 4/6 positions is correct, and assume that the balancer made the same guess.

This assumes a crank+flywheel assembly to be balanced as a single unit.
I am told that these days the crank & flywheel are balanced as separate units - is this generally true?

[512BB]

BMC wrote;
This assumes a crank+flywheel assembly to be balanced as a single unit.
I am told that these days the crank & flywheel are balanced as separate units - is this generally true?

Not in my experience Brian. I recently had a Twink's rotating parts dynamically balanced at Gosnay's, down in deapest darkest Essex, including pistons and rods, for the exorbitant cost of ?120.

All parts were marked for correct reassembly in relation to each other, the rotating parts that is. The rods and pistons were just balanced for weight.

Leslie

[AHM]

This assumes a crank+flywheel assembly to be balanced as a single unit.
I am told that these days the crank & flywheel are balanced as separate units - is this generally true?

I believe that the correct procedure is to balance individually, then balance as an assembly, so that any imbalance due to minute misalignment is corrected

[elj221c]

I am told that these days the crank & flywheel are balanced as separate units - is this generally true?

When I had my flywheel and crank sorted by QED (when they still had their workshop) they were indeed done separately.

[rgh0]

The specialist balancers here would all balance the flywheel, crank and clutch pressure plate assembly individually and then balance them all as a unit and match mark the assembly.

cheers
Rohan

[smo17003]

Presumably the crank pulley would need to be balanced at the same time?

Cheers

Mike

[rgh0]

If you are really paranoid you can also balance the crank pulley before and with the assembly but it is small enough and light enough to not normally add a problem in a road car and the even smaller and lighter ones used in race engines are even less of a potential issue.

cheers
Rohan