I'll see how I go time wise. The motors you are talking about sound like the 1.5l single overhead cam with chain drive. The ones I'm thinking of were the belt driven cam originally single
cam then double. I have got a copy of ACL's piston catalogue which has all the measurements and cross sectional pictures of the pistons. I may have found similar ones but don't know yet what
they are out of. Waiting for my neighbour to bring the rest of the catalogue home. She works for Repco. These are flat top with a 29mm compression height. The first ones I looked at were
dished but were fly cut for a 3 valve head. Possibly out fo the 626/Telstar. Let me know when you have done it as I am also now thinking of only going 78mm for reliability.
What are you doing with the head. I am going to get the injection hardware from the Japanese Pulsar given to me from a friend which I eventually want to put on when I find a cheap computer.
Gavin
Gavin

The E3 came out in the first of the front wheel drive 323's. There is also an E5. The E3 piston is a flat top the E5 is dished. The std bore size for these engines is 77mm. I am having the
block bored then will do a dummy assembly to check compression height to work out how much to deck the block to get the compression ratio I'm after. Then I'll assemble it again with the
head to find out how much and where to flycut releif in the pistons for valve clearance. I guess you'll have to do the same unless you want to wait until I've done it and I can let you
know.

What model does the E3 come out in. Over here the B6 is a 1600cc tht come sout in the Mazda 323 and Ford Laser. They first came in the rounded hatch back model. Mazda had a 4wd turbo in that
shape. Then they came as a twin cam in the next shape that was a lift back. Ford had the TX3 which was a front wheel drive turbo.Mazda's version was the Estina. 78mm is the standard bore for
the Mazda and they sound the same except for the compression height. I don't know if they are flat top. My concern is if the compression height is higher they may hit the head. I haven't
looked inside my motor yet to see how high up the standard pistons come. I have come across another piston in 78mm but it is 1mm lower in compression. Not sure yet which way to go. Some of
the Aussie guys have done it but I haven't had a response from anyone yet as to what is actually needed. I would be worried that the pistons are not strong enough to machine some off the top.

I'm currently rebuilding my a15 and plan to use mazda E3 pistons the compression height is 1.4mm lower I think... The pin is also 1mm bigger. They are a flat top piston. I
decided on a 2mm oversize, 78mm, as I thought 79mm might be a bit much, but people talk about doing it. Are these 3mm over engines not prone to splitting bores?

Guys I am trying to build up a mean A15. Can anyone tell me what I need to do to take it out to 1600cc. I know I need 79mm (120thou) pistons but what out of and what machining etc is
needed to make them fit (other than overboring).
I have been looking at Mazda B6 pistons but the pin diametre is 1 mm bigger (not really a drama) and the compression height is 1.4mm higher (may be a problem). Has someone done this
exercise and is there a better option.