I'm starting this thread to talk about some stuff that you should think about before you build an engine. If you decide not to just buy a prepared engine from Beau or just wanted a breif idea on what the diferent procedures are, start here...
The MP5T Engine started as a used block. It needed some work before the rebuild could happen.
Alignhone
Cylinder Deglaze
Bore Verification
Milled the Head Surface
Milled the Block Deck
Here they are explained...
I ripped them off a website, I'm not going to write them again, here they are..
Let the Discussion BEGIN!
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-
Align Honing
Align honing is the best method for precision alignment of main bearing bores. Promar uses the Sunnen CH-100 machine for all of its benefits and features, as we can minimize stock removal, usually less than .003" (.076 mm) off the caps compared to as much as .010" (.254 mm) with boring. Use of this machine maximizes precision and corrects distortion caused by warpage and cap stretch. This align hone procedure exceeds original factory accuracy for alignment, roundness and size and precedes the engine boring process.
Cylinder Boring
Promar employs the Rottler F54X boring bar with its large diameter and hard chromed spindle. This spindle is supported on adjustable tapered bearings for superior accuracy. The F54X uses a precision ground ball screw to control feed rate and cutter position. By controlling these factors the machine can repeat cutter position accuracy to .0002" (.005mm). With its digital programmable cycles, the F54X allows boring depth to be programmed to .0001" (.0025mm).
Cylinder Honing
The cylinder honing process assures precision sizing plus exact Ra finish in every cylinder in any type block. Promar finds that the automatic Sunnen CV-616 Cylinder Hone ensures better than original factory accuracy and corrects taper and out-of-round. Another benefit is that it produces surface finish, size, roundness and straightness tolerances equal to or better than original manufacturer's specs. The CV-616 produces consistent precision surface finish with uniform crosshatch pattern in each cylinder.
CV-616 provides base metal finish, free from fractured metal for immediate ring seating and positive oil control. It works for passenger cars, high performance engines, trucks, diesel and industrial blocks. This precision machinery hones any material including aluminum, cast iron and any alloy.
Promar insures proper measurement of Ra by utilizing the Mitutoyo SJ-301 surface tester.
Engine Balancing
Promar’s digitally controlled balancer is extremely accurate, producing precise balanced crankshafts, it has the ability to measure unbalance from .01 to 1,000 grams on work pieces weighing up to 500 lbs. (226kg). This process using the Sunnen DCB 2000 is optional for this application.
Resurfacing (Block & Head)
Milling machines that are used by Promar are set up specifically 1 for blocks and 1 for heads. The Winona Van Norman M3000 machines are used for their variable feed rate, which is essential to acquire proper Ra finish for each block. Ra finish determination is based on the type of block, be it aluminum or cast iron, and by the type of gasket used for each specific application. These machines utilize CBN (cubic boron nitride) cutters, which are second in hardness only to a diamond. During the cutting process heat from friction is absorbed and carried off by the discarded metal chips thus resulting in improved accuracy and excellent surface finish. The surface finish is then checked by using the Mitutoyo SJ-301. The Mitutoyo SJ-301 is utilized twice, once after resurfacing and again before final assembly Promar insures proper measurement of Ra by using the SJ-301. The next process is rod reconditioning.
(cool2)
Reply With Quote
Originally Posted by t3ase
