Standard sized 81 Jota pistons

J

Jotadreamin

New member
Location
Perth Western Australia
Hey All,

Just joined the Forum (finally) to help with info on 81 Jota rebuild.Am currently chasing set of standard forged pistons for the old beast.can get oversize but not standards.
Any help would be appreciated.

Cheers Colin.
 
Why use 30 years old technology pistons when there are better lighter pistons available. Nowt wrong with original jota pistons, but check out the weight differences between them and say the current Ross Racing piston available.
 
Let alone attaching them to those factory connecting rods when the superior crankcase saving Carillos are available.
 
Hi Colin - The Corsa & SFC1000 had 75mm forged pistons - maybe still some of them about - even years ago when I was selling pistons - I didn't do standard sizes to avoid owners putting them in worn bores and then whining about the pistons! - regards - Phil
 
g'day Colin,
& welcome to the forum.

not sure what your planning & i agree with the previous advice, to go for a rebore & 1st oversize.
however,, i do have a low budget option.  a set of dirty old standard size Mondial's if ya interested?
MissJ-Mondialx3.jpg

will even throw in the gudgeon pins, clips & rings.  all been used.
don't know the history, as i got Miss J (my '81 Jota) with about 30,000 kms on the clock.  was a runner, but i wanted to look inside the donk.
i could measure 'em up if ya interested?  postage at your cost.
but i'm guessing they're the same as what you already have taken out ??

cheers,  Mark

<edit>  i do know the engine had been previously pulled down by Noel Watson, the Ducati spanner-man.
hence the stamping 1,2,3 on the piston crowns?  & the head porting had been modified slightly. 

 
Don't have anything to add to the thread but was wondering. My Jarama is just coming up to 95k miles, still on original bores,pistons, rings etc. So, if/when I decide to 'refresh' the head/bores what pistons are recommended. Must admit Ross is a new name to me. Omega and Hepolite, Asso I know. What have you used and would recommend. Cheers  Stuart
 
Hi Colin,

Don't forget the other option...

If your existing pistons are good, you can fit new liners and bore them. You will need to bore each liner to suit a new piston anyway.

Can be cost effective. You can remove/insert liners using your oven.

P
 
The JEs I had were jewel like...bit confusing to get clear guidance on piston to bore clearance though...now I am running the original mondials , barrels and head from the RGS engine sat in Slaters for 30 odd years....sweeter than a sweet thing I must say, with red Sachse ignition and original dells.A bloody joy to ride back from the Iloc AGM on A roads last Sunday. Must be going faster...first time I could see the possible need for a steering damper...might just tighten the head race up! ;)
 
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