Lemonhead has gone 82mm sleeves on his racing engine and said it he could easily have gone to 83mm but wanted that extra for the next rebuild, however his engine builder said he should just go wet sleeve meaning you can just remove the sleeves for new ones when rebuilding if machined to take an silicon composite o-ring instead of cementing. His engine was supposed to be built for 8500-9000rpm.

Sleeved engines have no issues revving to what they are built for and are just as reliable as non-sleeved engines if you look at the renault sierra turbo R5 or the old R12 theres one at pick a part your way now in Kylsith a wagon ran perfect was for sale at the front but no one bought it so its in the yard. The A15 like all others A series has very thick casting unlike modern cast iron engines they were over-engineered so theres definitely room for this modification.

FERCO quoted me 500 for the full sleeve job cemented but could cost up to 650 with o-ringed base, then on every rebuild you just need new sleeves slid in using a step & o-ring like on the renault pushies which r just like A series in design bar wet sleeves. New sleeves $80 or $120 ea. machined + honing same price for renault sierra engines.

A big bore A15 leaves little room for rebuilds, stick to 77mm if you want cheap.

Dodgeman worked out an A15 offset stroker of extra 1mm (83mm) is possible if crank is within tolerances can use the undersized factory bearings. Using the A15 is no dramas as they are often milled for the A12 engines using A14 cranks with either a14/15 rods. A15 slugs comp height are 30mm and can go to 29mm but depending on cam you need to check for valve clearances of course. Rod pins are 19mm while ca20de slugs are 20mm and same compression height of 30mm with plenty of meat. Isuzu pistons are flat tops 28.2mm comp height pics below for comparisons I had for a while. Pics in order isuzu, ca18de & a15

Attach file:

---

  isuzu 4MKRY8053.jpg (38.86 KB)


  nissan ca18de 4MKRY2995 piston.jpg (57.00 KB)


  datsun a15 4KRY2831 piston.jpg (42.51 KB)