You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join HDForums.com community today!
Reprinted with permission of Donny Petersen, Heavy Duty Cycles, Toronto, Ontario.
DONNY PETERSENS
SPECIAL ENGINE FEATURE
FATHEAD TWINCAM88
Twin Cam 88 + 88B "Fathead"
Where should I start? Well how about first describing this engine, 4 ½ years in the making, as a bulletproof platform for the future. Designed with durability and reliability in mind, the engineers are expecting a minimum 100,000 miles before rebuild. I’m writing this in March and as of this date they already have a Fathead with this magic mileage and it doesn’t need a rebuild.
Yeah I know of all the mythical Evos that have supposedly logged on the magic 100 grand but lemme tell you that for every rider that’s actually done that there are many more exaggerating their motorcycles prowess.
The Fathead is gonna consistently do 100 grand without blinking. In fact there are parts in that baby that will not need replacing for a few hundred thousand miles like the pinion bearing that rivals those used in top fuel dragsters. This engine is overengineered. It is a superlative effort in engine design that I’ve never seen or hope to have seen in my 30 years of working on the V-Twin.It’s a platform for many modifications that are going to be extremely reliable. It is obvious to me that screaming Eagle is going to attempt to take charge and control this engines' destiny in the hiperformance arena.
Again, by March 98, the Factory has logged 2 million miles in testing with 12,600 hours on the Dyno.
You see! This engine has been developed to run stock forever and almost forever with Harley Davidson designed Hi-performance components. This is why it’s called a platform. If your heart desires this staging area for more power it will be available, reliable, fast and durable. For more info on this aspect see "Hopping up the Fathead" elsewhere in this issue.
Skeptical as all get out, I entered the room, which was full of engineers, product marketing people and William Davidson himself. The raw emotion emanating from Bill Davidson was readily apparent as Dr. Marty Rosenblum the Factory historian watched Harley history in the making.
I had my list of Evo deficiencies such as cracking cases, leaking base gaskets, oily venting, pulling case studs…need I go on. What had they done to fix these inadequacies in the greatest engine produced by the Factory up until 1999?
Wow!
Approximately 460 component parts of the new Fathead engine were laid out in front of me on a large table for my perusal. To my right, sat a fully assembled engine in its entire splendor. To my left was a 1999 Dyna twin cam 88 cubic inch Fathead motorcycle. Talk about Harley heaven. Only about 15 of the parts are the same as those used in the Evo. It took me three minutes to throw every criticism I was about to launch out the window. For this story see "Ya’ll ain’t Gitting in der boy. Dats were de secret stuff is." elsewhere in this issue.
What followed was three days of intensive training from 6:30 am to 11 p.m. at night on the new motor. The teachers were Bill Davidson, engineers"Skip" Metz, and"Koby" Kobylarz with "Spike" Kieffer giving the overview. Steve, "who bleeds Harley oil when cut" Piehl ran shotgun. "Mr. Clean", Kenny Sutton, the VP in charge of building the Fathead showed us late at night how he was going to actually build the engines in the Pilgrim Rd. 400,000 sq. ft. plant demonstrating all the quality control features. Jerry "Mr. Smooth" Wilke VP of HD and President and CEO of Buell ably demonstrated through his every action why Harley is successful and is going to remain so. Not a big Buell fan because of its departure from traditional Harley styling, Jerry’s enthusiasm and instruction soon converted me to being a big fan. And I’ll tell ya somethin’. For anyone to do that ya gotta be smooth.
Then the Factory Race Team head honchos Steve Scheibe and Art Gomper taught us about the VR1000 in a secret f
This ad is not displayed to registered and logged-in members. Register your free account today and become a member on HD Forums!
I have a 04 roadking I am rebuilding the top end. The cylindres use a kit No# 16526-99
I have a set of cylinders off a softail no3 on cylinder is 16593-99 they are suppose to be
off 03 flstc, can I use them?
TC88 description by Donny Petersen
