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IAME USA West

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IAME X30 Roller Bearings - Technical Discussion

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With all the recent discussion taking place about the new roller bearings for the IAME X30, it's time to explain a few things about them.

First and foremost, they are not a performance gain.

This style bearing has been used in the shifter engines for some time now where the abuse is extreme. The results were very good and this prompted IAME to have a bearing specially produced by SKF in the proper sizing to suit the X30 design.

This change is all about crank support and stiffness, not more performance.

  • Reduced big end ovalization. With the roller bearings the crankshaft runs more aligned, so the crankpin, which is in the center of the crankshaft assembly, remains a lot straighter during operation. This dramatically reduces the conrod big end's ovalization, which is first caused by crankpin defection. Lower rod bearing and washer life is much improved.
  • No wearing of the crankshaft. As the bearing's inner rings are pressed onto the crankshaft journals, the journals are protected from friction and the crankshaft life becomes nearly eternal.
  • No wearing of the crankcase. Due to the really long lifetime of the roller bearings, the replacement interval is much longer than with the ball bearings. This is a benefit not only for the time savings and cost for maintenance, it increases the lifetime of the crankcase by reducing the wear of the bearing seats in the aluminum, caused by the bearings' removal and installation. 
  • Same high quality worldwide. On the contrary of ball bearings, where people can use lower quality (less cost) bearings if they want, there are no other roller bearings on the market with the same characteristics as the SKF specially prepared for X30. The users will have the same quality worldwide.
  • Alignment in general. Better crankshaft alignment also improves the life of the oil seals and provides a more precision meshing of the gears that drive the counter balance shaft.

The only drawback to these new bearings is the fact that the inner race of the new unit MUST have a press fit on to the crankshaft. This is so the inner race is properly retained in place and also because it further improves the stiffness. These bearings may not be used on worn crankshafts where no press fit is available.

A complete assembly / disassembly document may be found on this website.

Lynn Haddock

IAME, SPA Technical Representative/USA

Official Statement From IAME USA Regarding 2021 Updates To New X30 Pipe And X30 Configuration

As many may remember, with the reconfiguration of the IAME distribution in North America in 2014, we put forth a commitment to freeze the engine configuration for seven years. This coming 2021 racing season will be our seventh year (*after a one-year grace period for COVID-19.) We have listened to our engine builders and customers [...]

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KA100 Airbox Tubes - Notice

Earlier this year, the USA IAME importers received a shipment of KA100 engines with faulty air box tubes installed. A few were actually illegal, many are very close. (tube internal diameter) It was not a large number, but since this was done by an outside supplier to IAME without their knowledge, it is not possible to [...]

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Official Statement From IAME USA Regarding Future of Platform Updates Beginning in 2021 Season

As many may remember, with the reconfiguration of the IAME distribution in North America in 2014, we put forth a commitment to freeze the engine configuration for seven years. This coming 2020 racing season will be our seventh year, and we would like to introduce some of the developments we have in the pipeline for [...]

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SKUSA Confirms IAME 175 SSE as the Feature Pro Class at SuperNationals 23 and Reveals Special Engine Rental Opportunities

Superkarts! USA today confirmed that the IAME 175 SSE will be the headlining class at SuperNationals 23 in Las Vegas. The announcement comes on the heels of growing support for the 175 SSE class and increasing adoption rates by teams and drivers in North America. To kick off the debut of the class format as a [...]

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TILLOTSON HB-15A CARBURETOR SCREWS ADVISEMENT / ASSEMBLY CLARIFICATION

It has come to our attention that some HB-15A carburetors may have the Low Speed and High Speed Adjustment screws assembled in reverse. It is advised for all competitors to check both adjustment screws to confirm they are in the correct location as shown below. The taper at the tip of the Low Speed screw [...]

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Superkarts! Usa Confirms First Shipment Of Iame Sse To United States And Limited Introductory Pricing

After months of development and fine tuning, IAME USA West today confirmed the initial shipment of the long awaited IAME SSE. The first units are expected to arrive in the United States as early as next week. Orders will begin immediate fulfillment in the order they were received, with boxes leaving the IAME USA West [...]

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SKUSA and IAME USA Outline Release for Long Awaited SKUSA ‘SSE’ Spec 175cc Shifter Engine

Superkarts! USA (SKUSA), in conjunction with IAME USA and IAME S.P.A., are excited to announce details of the long awaited release of the SKUSA shifter engine (SSE). The powerplant has been in development for several months with multiple iterations, developments, and improvements along the way. Both IAME and SKUSA couldn’t be more excited for the [...]

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IAME USA Announces Trade-In Program To Further Unify North American Karting

IAME USA (East and West) have collaborated with IAME S.P.A., MG Tires, and related parties to bring stability to the North American karting marketplace. “It’s no secret,” remarked Eric Jones of IAME USA East. “Many karting engine manufacturers and race promotion entities have either closed up shop or created an unsustainable business model. Our goal was to address this head on, [...]

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