Crank snouts and dampers/balancers

[PSIG]

Wanted: crank snout dimensions and balance factors for big and small sixes. Also stock damper outside diameters.

I need some input to begin a quest, for simplest OEM replacement of dampers/harmonic balancers with versions equipped with toothed wheels for greater EFI conversion and upgrade options. Simple gets it, and the ability to swap OEM dampers (or just the trigger wheel) could be a simpler option to custom wheels and damper mods. Issues with belt drives, etc, are secondary at this point. One step at-a-time.

I have searched and reviewed existing threads on this, without specific answers so far. I did find reference a few times that SBF dampers will "fit" big six without specifics. Nothing on small six so far that I've found. Any help appreciated on any six versions.

Example Ford Explorer V8 damper with trigger wheel:



Example of a stock Ford 4.6L trigger wheel:
Thanks!

 

[pmuller9]

The 300 crank nose is 1.375"
Here is a link for the small block sixes.

200 vs 250 balancer

Will my 2v performance balancer from classic inlnes work on a 250 engine?

fordsix.com

 

[PSIG]

Here is a link for the small block sixes.

Awesome! I'm a little confused by crank snout 335 length, and SBF++ diameter. None of the reference links work, with

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Does one or another (dimensionally) bolt straight on in every dimension for 250 & big six? Or few simple mods?

 

[Bronctopia]

The 1996 4.9 F150 had a special balancer with a weird 120 degree 3 tooth wheel.
Probably for waste spark?
Goes for about $100.
Maybe if you made a higher resolution wheel to fit over the 3 tooth?

 

[pmuller9]

The 1996 4.9 F150 had a special balancer with a weird 120 degree 3 tooth wheel.
Probably for waste spark?
Goes for about $100.
Maybe if you made a higher resolution wheel to fit over the 3 tooth?

The 3 tooth wheel was for spark misfire detection.
It can easily be replaced with a higher count trigger wheel.

 

[PSIG]

It's an option, though of course would prefer one with a high-count wheel as-is. It's pretty cheap to edge-cut the old damper on the hub, or cut a rabbet for a specific wheel, but not everyone wants the custom machining hurdle. OEM stuff is relatively cheap, if easy fit is doable. Just wanting to confirm if anything is getting in the way of an easy swap dimensionally.

 

[akamcfly]

The 1996 4.9 F150 had a special balancer with a weird 120 degree 3 tooth wheel.
Probably for waste spark?
Goes for about $100.
Maybe if you made a higher resolution wheel to fit over the 3 tooth?

Pictured here is a 1996 4.9 balancer with a 36 tooth rear sprocket meant for a Honda CB300r. BCD is a match. The tapped holes in the balancer are 1/4-20 on a 90mm BCD (because 1996 Ford). The sprocket clears label side up or down. Label facing the balancer will give you a little more room between the balancer and the engine block. These sprockets are around $30US at the Amazons and require little if any modification to fit. The tooth tips will likely need to be filed to make a larger surface area for the sensor to see them.

 

[DON]

Just so you know, don’t know it will help either, but the balancer spacer from a 390 will fit on the 200. I have an old one and am working on a serpentine belt for the 200. I did no checking on how deep everything would be, I just slid it in the front of the 200. The 390 with ac has a 3 belt adapter for the balancer, the bolt pattern is the same 3 bolt pattern on the 200 as well
For what it’s worth?