source for 1800 P/C?

[germansupplyscott]

yes, the 93mm barrels can be bored for 94mm pistons.
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SL

[Very Large Squirrel]

Thanks for the reply .So is it that simple that you just have them bored and fit the easier to get 94mm 2 ltr pistons ! or is there other modifications to do ? such as have the case halfs machined, pistons tops machines , heads machined etc etc.

[Blaubus]

if the pin height is different than the 94mm piston, you might need to shim the barrels to get enough deck height. not something you want to make assumptions about. most engines need ~.060 deck to prevent the piston from hitting the head at high revs- crank flex, carbon buildup, etc.

[germansupplyscott]

even though the pin heights are different, there is no shimming needed. the barrels for 93 and 94 are nearly identical except the 93mm have a 5mm thicker wall. yes, i agree it is always necessary to measure and set deck height regardless of what parts you are using.
_________________
SL

[NASkeet]

Yes, it should certainly be possible, to ream out 93 mm bore, 1800 cc engine, cylinder barrels, to either 94 mm or 96 mm. This is said to now be quite common practice, owing to the lack nowadays, of good-quality, after-market, 96 mm bore cylinder barrels & pistons, such as those from NPR.

If one is going to do that, it would be advisible first derust them, using phosphoric acid solution, which my Californian correspondent, Jim Hayden, obtains cheaply by the US gallon (about 0·8 x an Imperial gallon!), in the form of toilet-bowl cleaner! Some might also suggest molten aluminium spraying of the fins, to improve long-term heat transfer, by inhibiting rerusting.

The thermal conductivity of aluminium (circa 200 W/mºC) is about five times that of iron & steel. It might also be possible to black-anodise the sprayed aluminium, to increase the surface emissivity and hence increase radiant heat transfer.

One can certainly obtain 96 mm diameter pistons, with the correct gudgeon-pin to piston-crown dimensions, but I am not sure about 94 mm diameter pistons.

Regards.

Nigel A. Skeet

[germansupplyscott]

[Karl]

I do! Along with pinking at tip in.