Harmonic balancer

[jcmc]

Hi,

Just wondering what balancers people tend to use when fitting a late model windsor (e.g. roller block 5.0) to early Mustangs?

I have recently fitted an AU2 XR8 engine to my 66 Mustang, and used a conversion balancer and flex plate from NPD. They are both allegedly 50oz imbalance to suit a late model 5.0 (p/n 6316-15a and 6375-18).

To fit the early drive setup I changed the timing cover and water pump and am now running a normal "v" fan belt.

The first problem I noticed was that the timing marks are in the wrong spot for the timing case/pointer I got (this is a stamped tin thing that sits to the right of the balancer looking at the engine from the front). The marks are probably 20 degrees out I reckon.

Ignoring that, the engine seems to get a bit of a vibration going at around 1500-2000 rpm. Rev it more and it seems to go away. Its not shake your fillings out bad, but its noticeable.

I'm thinking the balancer has the wrong imbalance too? Maybe they shipped me the wrong thing?

Any advice appreciated.

[Shaunp]

You can buy a timing tape sticker to get the marks correct, but if it has vibe the flex plate or balancer is wrong, Ive had a few flex plates in the wrong box, but you can but them any where and they are cheap.

[Shaunp]

do you have pictures of both, if the timing marks are wrong I bet the flex is whats wrong it will be 28

[jcmc]

I didn't think to take pictures of the flex.. they looked to have similar weights in about the same spot. The new one was slightly smaller diameter as I recall.

I have a spare 50oz 4-bolt balancer so I might try that first

[hybrid]

The 50oz weights are normally around 10mm thick, with the 28s more like 5mm