Harmonic Balancers:

All Romac Harmonic Balancers are SFI 18.1 spec approved. They are offered in four styles. Most are 360 degreed with a fully encapsulated outer ring via a shoulder at the rear and a serviceable circlip mounted at the front of the outer ring.All Romac Balancers are individually “Consecutively Marked”, fully serviceable and need no special bonding with the elastomer.

Balancers can be ordered with undersize bores to suit undersize crankshafts; simply indicate this by adding the undersize to the P/N when ordering. To be sure of the bore size you need you should measure this prior to purchasing.

1. Performance Series:

Steel Inner Hub / Steel Outer Ring, for Mild Street, Strip performance engines that offer increased harmonic absorption over stock units. Most have 360 degreed outer rings and are similar in weight to factory cast units but with the safety of an encapsulated outer ring. They are available in External or Neutral balance.They weigh from 3kg to 5kg. The RPM ranges up to 8500.

2. Anodised Pro Series:

Steel Inner Hub / Alloy Outer Ring, for very High Performance Street, Marine or Race engines requiring the added insurance of a Steel Inner Hub for strength where dry sump pumps etc may be installed.

Romac recommend this style of balancer over all other balancers we produce due to its flexibility and endurance characteristics. Weight savings of approximately 1/3 less can be achieved with this style of balancer over our steel units and factory units. They are available in External or Neutral balance. They weigh from 1.8kg to 3.5kg. The RPM ranges to 10,000.

Alloy Inner Hub / Alloy Outer Ring, for Marine, all out Drag Racing or Circuit Racing etc where nothing is required to be run from the inner hub or outer ring especially dry sump pumps. These balancers are particularly important to tight cornered tracks where engine revs are low and instant revs are required to accelerate out of tight turns. They are only available in Neutral Balance. Extreme weight savings with as little as 1kg total balancer weight is possible. The RPM ranges to 10,000.

3. Blown or Supercharged Balancers.

These have 4340 grade Steel Inner Hub / Alloy Outer Ring, for Street, Strip or Marine applications with dual keyways. They have a STD 3/16” and 1⁄4” 180 degrees opposite keyways. All Blown balancers come with a larger seal boss diameter.

They are available in External or Neutral Balance configurations. There is a weight saving applicable to our Steel/Alloy units. Front inner hub face can be Standard Factory layout or our standard 6 Bolt pattern with a 2” inch register which suits standard blower pulleys.

The RPM ranges to 10,000.


The attributes associated with our Balancer Part Numbers in our catalogue include External Counterweights nominated on most Ford balancers. The counterweight amount is stamped on the balancer.

P/N 0202SA, tells us it’s a Chevrolet SB steel inner and alloy outer.

P/N 0209/50 tells us it’s an early model Ford Windsor fitted with a late model EFI Ford crank that is 50 ounce-inch imbalance externally and not 28 ounce-inch as normal. The catalogue should inform you directly at the P/N what style of balancer it is.

Undersize Bores:

Balancers are available with undersize crank bores to suit undersize crankshaft snouts. Just add the undersize to the part number, for example, 0202SA-1 tells us the bore needs to be .001” smaller than factory. Undersize crank bores are available from 1 thousandth to 10 thousandth in 1 thousandth increments.

There is an extra cost when ordering an undersized balancer.

Material used for Balancers:

Steel Inner Hubs: K1045 Carbon steel

Alloy Inner Hubs: 2011 Aluminium Bar T6

Alloy Outer Ring: 2017A Aluminium Hollow T4510

Blown Inner Hubs: 4340 Alloy/Steel

Steel Outer Ring: K1045 Carbon Steel.

Timing Cover Seal Information:

Some Balancers require a different timing cover seal as the snout diameter is larger i.e. the new seal has a larger ID but the same OD.

SKF Seal part no - 19215 suits

0202AA - 0202SA/B – 0205SA/B – 0206AA – 0220AA – 0220B

SKF Seal part no - 20520 suits

0203SA/B - 0204SA/B – 0209/28/B – 0210AA – 0240B – 0241/28/B – 0241/50/B

Our factory will be closed from 7th of June 2024 until the 17th and will reopen on the 18th of June 2024.