ahale2772
New member
- Joined
- Oct 27, 2011
- Messages
- 2,442
Question for those with fire ring experience.
The fire ring HG kit I got from Keating includes fire rings with an OD that measures ~ 4.5 inches. The ring cross section diameter is .105" (ID at 4.29")
that makes the center line of the ring a 4.395"
the machine shop that I sent my head to that has done "over 50" of these style groves machined the grove center on the head at 4.420 (.120 with, .030 depth, 4.30 ID, 4.54 OD)
therefore, the fire rings sit on the inside of the grove in the head. (theoretically .01 interference) The machinist claims this helps align the ring, and says he has never seen a failure.
Keating wants .015 of clearance on either side of the ring (centered at 4.395), as in the ring does not center it self at all, and has room to compress into an oval shape without touching either side of the grove.
should I attempt to run it? or cut the ID of the head grove back another .025 to bring it to Keating's spec?
The fire ring HG kit I got from Keating includes fire rings with an OD that measures ~ 4.5 inches. The ring cross section diameter is .105" (ID at 4.29")
that makes the center line of the ring a 4.395"
the machine shop that I sent my head to that has done "over 50" of these style groves machined the grove center on the head at 4.420 (.120 with, .030 depth, 4.30 ID, 4.54 OD)
therefore, the fire rings sit on the inside of the grove in the head. (theoretically .01 interference) The machinist claims this helps align the ring, and says he has never seen a failure.
Keating wants .015 of clearance on either side of the ring (centered at 4.395), as in the ring does not center it self at all, and has room to compress into an oval shape without touching either side of the grove.
should I attempt to run it? or cut the ID of the head grove back another .025 to bring it to Keating's spec?