There has been a post recently about an issue with someones welded backing plate thickness causing stub cam oil grove misalignment problems that blew up a customers cammer.
The Bill Coon backing plates are one piece stamped units made of 13 Gauge metal and are stamped exactly as the orriginals were, no welded pieces.
Bill wanted everyone to know that the orriginals are made from 13 gauge metal, which is hard to find. All of his backing plates are made to orriginal thickness, so whatever brand backing plate you go with, measure it to make sure it is manufactured using the orriginal gauge steel to try to prevent this from happening again as changing the backing plate by 1 Gauge changes the thicknes by 0.025-0.030" and misaligns the stub cams oiling grove.
Bill said; "The Cammer doesn't use a thrust plate for the cam like a regular FE, it uses the bearing in the front timing cover."
Not all of the timing covers that are being made are spot on either, which can cause misalignment problems with the stub cam by itself, or compound the problem with an improper thickness backing plate.
The problem is that the second cam journal of the stub cam sends oil to the head.
The orriginal Ford Stub Cam Groove is 0.075" wide. (Bill measures and remeasures all aspects of orriginal Ford parts and also orriginal Ford Prints.)
On the Stub Cam that Bill Coon is bringing out, he has addressed this somewhat, by increasing the Grove width to 0.125" which is the exact hole size in the Block Cam Bearing. This journal on Bills Stub Cam is almost 1/8" wider then the orriginal and will also help in misalignment problems from inexact parts.
The orriginal stub cam half round key is dead soft, and Bill has addressed this by elongating the Key as well as an aloy hardened the Key as even a bent, non sheared keyway can cause valve to piston destruction.
Bill has also increased the area of press fit between the Stub Cam and the Gear.
Bill has made sure for propper press tollerances, and his stub cams will be made from 8620.
Bill recomends to always check for stock tollerances by measuring, never go by what a seller says, or assume.
Bills Coons timing cover was held up by paying for a scan of a factory timing cover, and the first guy only scanned the front. Bill has seen the consequences of this in others covers and knew with the stub cam spacing and other clearance issues that this was unacceptable. This first guy was supposed to fix the problem and botched it a second time and Bill had to go elsewhere for his scans. The second individual got things correct, and Bill made some improvements, so the new covers are being worked on and should be made available arround the time when this batch of heads gets shipped.
Bill is also actively working on some other cammer pieces the forum hasn't heard about yet, that I will be giving information on in the near future.
"Just sit back and enjoy the ride, it should be alot of fun":Bill Coon
Roger
|
