Engine cylinder block and sleeves

- It's block ( typically , JIS-FC 200 ) with sand casting .The water passage is formed using expendable
shell core .Laser or induction hardening is sometimes
used on the bore surface to give Durability ,and it's
structure maybe cast iron integrated type . and it is
Low cost but heavy.

- Another structure is Hyper-eutectic Al-Si block
without coating.where it's processing is Low-pressure
Die casting using A390 alloy.

The bore surface is mechanically Polished to expose Si.
where The Wear-resistant coating is necessary on the
piston side .

- It is Aluminum block with plated bore surface ,where High
cooling performance Bore pitch can be shortened in multi-bore engines.

- Aluminum block with metal-sprayed bore surface, where Cooling performance is the previous type.

- Fiber or particle reinforced Aluminum alloy composite,where The rigidity of the cylinder bore increases.

VERY IMPORTMENT NOTES :

Chromium plating of rings or bores ,and provision of ‘dry’ or ‘wet’ liners of special irons centrifugally
cast , are methods of attack which are used singly or in combination , with varying degrees of success
and commercial justification.

Chromium plating of bores has produced remarkable results in reducing both abrasion and corrosion
wear , so reducing bore wear that life between re-bores has been extended to four or five or even more
times normal experience . It is , however , costly , and running-in is a lengthy process , though assisted
by the matt or slightly porous finishes used.

Application of hard chromium plating to rings rather than bore is effective in protecting both ring and
bore . With the considerable difference in the hardnesses of the moving parts , abrasive particles tend to
be so deeply absorbed by the softer material that they do not wear the harder.