Honda Pistons

[Malcolm Parker]

I am putting together a new engine which is using Honda Generator pistons from an earlier engine.     The pistons have an arrow on them which I assume is indicating the thrust side of the cylinder?   It isn't the 'front' of the engine as the arrows are indicating one side or the other.  I just want to make sure that the pistons are going back in the cylinder block the same way as they were.

[AustinWood]

I fitted Honda pistons in an Austin engine and spent a lot of time looking into what the arrow means. All I can remember is that it isn't the thrust side. I think it may have been 'pointing to the exhaust valve' and I worked out what that would be. At the time I asked suppliers and they had varying opinions.
I did find Honda spec that said what it meant, but can't remember where.
That doesn't mean that they were that way round in your engine.
I doubt if it will make a difference. Are there scuff marks on the thrust face of the piston?

[Alan]

Well I built a few engines with Honda pistons. I always pointed the arrow to the thrust side not because you were supposed to, but it seemed right to have them all pointing the same way. As far as I know they all hung together.

[Steve Jones]

I used Honda pistons in two engines and did as Alan and for the same reason. Both engines are still working fine although I only own one of them now.

Steve

[Malcolm Parker]

The Honda pistons are now fitted and the block is on the crankcase and the conrods are on the crank.   I fitted the pistons with the arrows pointing to the nearside.    Study of the pistons suggested that was how they were in the previous engine (the Reliant crank one).