Jims Catalogue

TWINCAMRODS& CRANKPINWELDSERVICE

JIMS ® CONNECTING RODS PRODUCED FROM FORGED 4340 AEROSPACE QUALITY STEEL

Solid Bronze Bushing for .927 wrist pin Also Available on Page 89

JIMS ® Connecting Rods start out as forged aerospace quality 4340 Chromoly steel blanks, then the rods are CNC machined on our high tech mills. Each rod is heat treated, magnafluxed and shot peened, then inspected. From there, each rod goes back into the CNC mill to bore both the rod race and wrist pin bushing bores to within .0003" of each other. A 32 bore finish is achieved for the best possible bushing and race adhesion. The wrist pin bushing oiling hole has been optimized for uti- lizing lubrication of wrist pins, and an increase in the strength. JIMS ® chooses “H-Beam” rods for stability and

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4340 Aerospace Material

strength, for both drag racing and any street application, over the standard “I-beam” rods. Although we realize that “H-beam” rods are very difficult and time consuming to manufacture, JIMS ® believes that it is well worth the extra effort. Each rod set has JIMS ® wrist pin bushings installed and are sized for .927” pins. Rod race to be sized by engine builder. JIMS ® “H-beam” rods are available in two different lengths of centerline dimensions that are: 7.667”or 7.600”. Rod races must be finished sized. For more details see No.4015-IS instructions.

No. 4017 - Use on Twin Cam ® , 7.600” length. No. 4015 - Use on Twin Cam ® , 7.667” length.

JIMS ® RACE WELD FLYWHEEL SERVICE

Squeezing all the horsepower out of your Twin Cam ® is relatively easy to do as JIMS ® and other reliable performance companies have been perfecting it for years. Getting all that power to the pavement is "sometimes" a completely different story. This is just one of the reason's JIMS ® has built a track record

for one of the strongest lower end assemblies available (flywheels, crankpins, nuts and connecting rods). Taking it one step further, we now offer a Race Proven flywheel adherement service - RACE WELD. We all know a stock clutch and or other components will not live for long peri- ods of time in extreme high horsepower racing conditions, that is, if you can get the power to the track (controlled traction). For this same reason, JIMS ® uses the latest developments in: aerospace steel, state of the art machining, heat- treating and precision assembly to create one of the industries strongest lower ends (The JIMS ® Flywheel Assembly). For some engine's, experienced racers and extreme riders will benefit from using this new flywheel adhering technique (welding). So for you racers out there (you know who you are) that are looking for the flywheel assem- bly that can hold up under extreme conditions - look to JIMS ® new RACE WELD service. All welding is done after flywheels have been precision assembled and trued. Each assembly is held in such a way that no arcing of bearings can take place. The entire assembly is covered in a way that the only open area is the four places that are welded. In doing this, we eliminate any chance of foreign material contaminating the assembly. For the ultimate in flywheel retention, choose the JIMS ® new RACE WELD Service.

RACE ONLY

No. 1880 - Available service for use on JIMS ® new assembled flywheels only.

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