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#1
77mm ITM Piston, Confirming Dish Volume.
Rallytwit
Posted on: 2019/12/15 0:35
I just got a set of A15 pistons, ITM # RY6119 and can confirm that the dish volume is 10cc. Note this is the offset dish style.
Since this question comes up from time to time I'm posting this so people can find it in a search. Also note the compression ratio with a GX head (29cc chamber) & GX .8mm thick gasket will be 9.89-1.  
#2
Re: 77mm ITM Piston, Confirming Dish Volume.
ddgonzal
Posted on: 2019/12/15 21:19
Is that the 6.5 mm depth of offset dish? or the 3.5m deep
#3
Re: 77mm ITM Piston, Confirming Dish Volume.
Rallytwit
Posted on: 2019/12/15 22:46
Dave they are 6.5mm deep.
I'm going to give up some power over buying another set of flat tops from JE (probably 5-6) but as these were on $99 I'm willing to live with it. I have to check but I also may be able to go back to running 91 octane pump gas. I'm expecting the motor to be around 95hp at the wheels.
#4
Re: 77mm ITM Piston, Confirming Dish Volume.
ddgonzal
Posted on: 2019/12/15 23:12
Not bad only $104/set of 4 from rockauto.com includes rings which is good because they are different size than other A15 rings
6.5mm is a deeper dish than the offset G34 A15 pistons -- they are for 1981-1982 Datsun 210 engine nominally 8.5:1 with 35cc combustion chambers Attach file:  RY6119-STD.jpg (66.43 KB)
#5
Re: 77mm ITM Piston, Confirming Dish Volume.
dattoman_1000
Posted on: 2019/12/16 11:20
Rock won't ship to Oz anymore
Stupid tax system
#6
Re: 77mm ITM Piston, Confirming Dish Volume.
Rallytwit
Posted on: 2019/12/17 3:02
SW Motorsport had them at a decent price I was planning on ordering them but they became available from Rockauto.
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