1127 in 1052

[clivegto]

Any one put 1127 pistons in a 1052 motor.

[george 1100]

Very common poor mans mod. Gives 1109

[Oilyspanner]

1109 makes for a sweet engine size on the 1052. You'll miss out on the 12:1 compression ratio of a big bore piston kit  - a cheap half way house- you'll get gains but not as good as a BB kit and used pistons can be hit or miss. Would really need to re-ring the pistons too. If you got an engineering firm to skim the head and get the head flowed, you could gain much more.

[clivegto]

Engine in question already has a flowed dot head on. What will the 1127 pistons raise the compression by on a standard 1052.

[Oilyspanner]

The volume of the 1100 head seems to be pretty constant, so the pistons must be shaped to keep the CR at 10:1, the 1052 has 1mm less stroke so CR will be a tad lower despite the extra capacity - I haven't tested this, but it must be like this, otherwise the head volumes would vary on 1052 and 1127 . . .  Good news with the flowed head, it'll work really well with the extra capacity.

[clivegto]

Thanks that was what I was thinking.

[george 1100]

I'm pretty sure lump is the same on 1127 pistons so increasing the bore 2mm and keeping everything else constant,ie stroke,combustion chamber, gasket thickness,etc, will raise comp approx .5. If the only element changing is an increase in  swept volume then compression increases. On the other hand, if the lump is different between the 76 and 78mm piston then it's a different story. You will need to measure pistons to know for sure. Suzuki spec for both engines is 10:1 . Something to think about. 

 

Edited April 25, 2016 by george 1100