Engine
- Thread starter murfeey
- Start date
With the amount of work it takes in shop time ,may be better to buy new after market crank
Mike Pass
Supporter
The correct way is to have the entire bottom end balanced as a whole. This will mean stripping the engine so the rotating assembly can be put on the balancer. there are engine builders who can do this for you - depends where you are for the nearest one.
However you can get fairly close by having a flywheel match balanced by an engine shop to known 28oz flywheel. . The 28 oz balance actually means it is out of balance by 28.2 ounce inches. This means that it is out of balance by a factor equivalent to placing a 28ounce weight at 1" from the centre - or 2.8 ounce weight at 10" from the centre. That is - the weight times the distance from the centre is what matters. A small weight a long way from the centre has the same effect as a large weight near the centre.
The later cranks were lighter and so needed 50oz balance to balance them.
There are two ways to make a 28oz balance flywheel from a neutral balance one. Either remove weight from the opposite side or attach weights by bolting (see pic) or welding a weight onto the flywheel. I have attached a pic of a steel neutral balance flywheel that I had match balanced a few years ago - a lot of holes! Some aftermarket flywheel sellers also sell the bolt on weights but they need to be accurately indexed and at the correct distance from the centre.
Cheers
Mike
However you can get fairly close by having a flywheel match balanced by an engine shop to known 28oz flywheel. . The 28 oz balance actually means it is out of balance by 28.2 ounce inches. This means that it is out of balance by a factor equivalent to placing a 28ounce weight at 1" from the centre - or 2.8 ounce weight at 10" from the centre. That is - the weight times the distance from the centre is what matters. A small weight a long way from the centre has the same effect as a large weight near the centre.
The later cranks were lighter and so needed 50oz balance to balance them.
There are two ways to make a 28oz balance flywheel from a neutral balance one. Either remove weight from the opposite side or attach weights by bolting (see pic) or welding a weight onto the flywheel. I have attached a pic of a steel neutral balance flywheel that I had match balanced a few years ago - a lot of holes! Some aftermarket flywheel sellers also sell the bolt on weights but they need to be accurately indexed and at the correct distance from the centre.
Cheers
Mike
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Mike Pass
Supporter
There are 121 and 157 tooth flywheels. As far as I know the SGT uses a 121 tooth flywheel (as per GTD) rather than the standard size 157 tooth Ford flywheel which I believe is used by Tornado. The 121 tooth flywheel will fit inside the Renault bellhousing allowing the use of an adaptor plate rather than a cpmplete bellhousing change.
Cheers
Mike
Cheers
Mike
Cheers Mike.i have a crate lbc 302 as new .complete with 28oz damper new in the box.the lbc came assembled the flywheel.
I'm using a chris cole flywheel .the a p clutch recommended by mick sollis .now the new harmonic damper is 28 oz.question does the brand new rebuilt engine have to be re stripped as it has already been assembled and re balanced or could I get my clutch and flywheel balanced and fitted as read up.it can be done both ways..
Cheers shaun
I'm using a chris cole flywheel .the a p clutch recommended by mick sollis .now the new harmonic damper is 28 oz.question does the brand new rebuilt engine have to be re stripped as it has already been assembled and re balanced or could I get my clutch and flywheel balanced and fitted as read up.it can be done both ways..
Cheers shaun
Davidmgbv8
Supporter
I do not know the answer but here is my small diameter 121 tooth flywheel being balanced to my crank.
Sorry folks, I thought I had deleted this... its an article that showed how the imbalance is divided between Damper & Flywheel. EG the 50 oz factor has 34 oz in the damper & 16 oz in the flywheel. The above link does not work, my fault.
Davidmgbv8
Supporter
Davidmgbv8
Supporter
Do you have an extra oil feed to the rear oil gallery via the cutaway portion of bell housing at top?
Davidmgbv8
Supporter
The cut out is for the slave cylinder clearance on the adapter plate
Davidmgbv8
Supporter
That is what air seems to me, but bell housing at shop
