hmmmm, doesnt sound right, that counterbore is mighty deep!
only got .9 of a mm of material left!

Isn't the counterbore just the thickness of the spacer you place on the shaft?

Feel free to double check by all mean's but if you place the washer on the shaft and then measure it from the end to the washer face its 1.6 likewise if you measure the drop on the piston overall its 2.10 but theres the slight ring on the face which measures 0.5 again making the C/bore depth 1.6, I won't be offended if i'm proven wrong, it would obviously be better if someone double check's before production start's, measure twice cut once and all that jazz

Ah, so you actually mean that the counterbore is 0,9, i.e. the thickness (2,5), minus the exposed length of shaft (1,6).
I'll get the verniers on one tonight and get a double check done!

(and yeah, i think it is just the washer thickness and dia that makes up the counterbore. I'll have a look and see what the easiest way to do it is.)

Gixxer, is it possible to make a few up and get them to someone local to make sure fit is ok, rather than making me a load and shipping them over? (and finding they don't fit!!)

Maybe i should just buy my own lathe..... ;o)

Yeah, I'm definitely interested in a set of H2 tapered pistons

What??? You were actually right the first time only 0.9 material left between the piston face and the C/Bore.

sorry, but no idea what you've been measuring, I've got 2,1mm left after the counter bore!

anyway, durango big bore
12.25 outer diameter
2.5 thickness
2.5 inner diameter
0.4 counter bore depth (the raised ring isn't needed)
just got to get the washer diameter for the counter bore size. And they are all inside me shocks.....
got a mate going to try and get another set of verniers on one.

Fine balls it up!!! what your classing as 2.5 dia i measured at 2.6 (both the piston and the step on the shaft) but it's not a through hole it's to a depth hense a counter bore! The through hole is 2mm I'm not on about nore ever have been on about the pointless raised ring! Jesus!!!!!!!!!!!!!!!!

calm down!
anyway, found the end stop/step you are talking about. not all my Pistons appear to have it. the ones in the car do. the two I measured don't.
And fwiw, it doesn't appear to be needed anyway, the washer and step on the shaft prevent movement in that direction. machining it will be a pain too!

Dood's the easiest way to sort this is if sumone can post one to me to copy exactly then they will fit :)

Could be interested in some pistons for a procat.... shall I just send you one over?

Ta

Adam

That's the easiest thing to do mate

Omg it's like a playground at a girls school lol.

Revised size H2 pistons are a very good fit. These seem pretty damn good

Hello mate. I would need 4 sets for the durango big bores. How much would is it included shipping to austria and do you accept paypal?
Kind regards

Yeh sorry lost it for a while :blush:. I've PM'd gixxer for his address I'll send him a kit original for him to copy and price.

Blanks for any car are a quid each, I'll be doing more h2 pistons today as they have been tested for fit and are good :)

Just wondering what people's thoughts on aluminum pistons?
Mainly because its easier to hold a tight limit on and the cost would be no more than plastic

Nah, no one has pulled my hair, or said i smelled of cabbages and wee. ;)
No worries, just wonder why i have 2 (and apparently only 2) without that end stop. I've got (total) about 20 pistons, mostly standard size, and ALL appear to have it, except 2. Which i'm pretty sure i haven't used. Ah well.
Thanks for sending one on to Gixxer, saves me sorting from this side of the North sea!

Hi no problem making them I belive I have a big bore piston on its way to me as for the postage I haven't got a clue what it would be wouldn't have thought it would be a lot
And yeah I accept PayPal :)

Oh and if you are sending me a piston to copy please add a note with how many you want and your user name off here just so I make sure everyone gets the right ones

Will you be keeping tabs on all the dimensions? So i can just order some of the Durango BBs once you've made the first batch.......

set of 16mm associated on its way john need the od at 16mm though not as the pattern ones please