Brush Research Mfg. Co. has a Flex-Hone For Any Type And Size of Cylinder The Flex-Hone® Process (Super finishing) produces a controlled surface condition unobtainable by any other method. It involves finish, geometry and metallurgical structure. A high percentage plateau free of cut, torn and folded metal (with radiused ports).
A resilient, flexible, honing tool with a soft cutting action. The abrasive (points) globules each have independent suspension that assures the Flex-Hone® to be self-centering, self aligning to the bore, and self-compensating for wear.
The sample Bore listing below are listed to only to the ten thousandths (0.01) which is all that is needed to find the correct hone.. If your engine is not listed below and you do not know your bore size, please call (1-800-831-0884) or email us with your year, make, motor size and V.I.N. code, and we will find the correct hone for you.
Ford
3.0L
300
302
5.4L
330
351
352
360
390
400
6.9L*
428
429
7.3L*
460
Bore
3.50
4"
4"
3.55
3.87
4"
4"
4.05
4.05
4"
4"
4.13
4.36
4.11
4.36
Chevrolet
2.2L
2.8L
3.1L
3.2L
3.4L
250
283
302
305
307
327
350
396
400
454
Bore
3.50
3.50
3.50
3.56
3.62
3.87
3.87
4"
4"
3.87
4"
4"
4.09
4.12
4.25
*International
Specifically, it is a low-temperature abrading process that exposes the undisturbed base metal structure to produce a long wearing surface. It is a method of developing a surface on a metal part which is optically smooth and metallurgically free of any fragmented, amorphous or smeared metal from previous operations. It is accomplished at a low pressure where the “stones” float.
See and read the various booklets of actual tests covering almost every situation that will ensure a superior performance in situations depending on surface finish.
The particular type of Flex-Hone® crosshatch is extremely efficient in providing a multiplicity of oil grooves or valleys for oil retention as opposed to the often undirectional or uneven valleys common to the conventional type rigid hone. A crosshatch that usually remains as the cylinder wall has been wear-reduced by the FlexHone®
As received, rigid honed by factory rework section. Photo at 1000x. Cross-hatch has majority of cut in one direction. Smeared, torn, jagged and folded meal on surface. Smeared metal loosely attached to surface. Very peaky profile of finish. 40 to 50u” (1.02 to 1.27um) finish. Cylinder #B-1
Click on images to view detail
After Flex-Hone.® 120 grit silicon carbide, photo at 1000x. Uniform cross-hatch pattern. Clean open appearance with smeared, folded and torn metal removed. Excellent semi-plateaued profile. Small dust particles visible on surface in “Y” photo. 20 to 25U” (.51 to .63 um) finish. Cylinder #B-1
