Piston Source?????
Turbo Mini Forums

Where can I get 1275 forged pistons with enough dish to keep it streetable on 10psi? All I have found is 1293 dished pistons, and 1275 non-dished. I have looked on sites like Avonbar, JE pistons, and Mini spares with no luck, where should I be looking? If you are running a 1275 T3 with around 10psi what kind of pistons are you using?

:cool::cool::cool:

Caution- objects in mirror are LOSING!

Whats so bad about 1293 ??

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

You can get Omega cast ones ion 10cc. With a decent head, that'll be fine..

Hi,
You should be able to run 10psi on a standard engine with intercooler and a good set-up on the RR. The higher you keep your CR the better it'll be for street use... Eg spools up quicker and better part throttle economy (is that a swear word on here? :$ )
Cheers,
Gavin. :)

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Nothing is "BAD" about a 1293 but I live in the states and no one would be able to bore it out.

Caution- objects in mirror are LOSING!

uh?

I had no problems finding places to bore motors... It's only an engine afterall.

There are many guys over here who specialise in the a-series aswell... So that's just the cost of shipping and someone familar with the A-series could do it. As i said though, a +020" isn't anything trying...

If you find a shop with a Sunnen CV-616 Honing machine they should be able to rough hone the block out without boring it. I've done this in the past to a few blocks and it works great and even better if you use a head plate to eliminate the head stud shadows in the bore.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

http://www.minimania.com/web/threadid/7285...3/msgthread.cfm

Dave it's been 10 years since i took 20&40thou out of a block on a CK-10 but the results were spot on.
The interesting thing was just just deglazing the block first to see the points where the head studs pull back the cylinder walls when torqued up.. Thing is you wouldn't notice this if your not honing with a good head plate to simulate head stud torque, it's amazing how much the studs pull on the bores.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

Well reading into it more following that article has made me decide on having any blocks i need machining sending to that 'compcar' fella - or finding someone locally with a Sunnen...

V. The block was a used turbo item with around 15000 miles on it before it got the hone treatment.
The job went as follows, Old block fitted with 2" steel head plate, ARP studs and steel spacers to take up the leftover stud length all this was then torqued up with ARP molly to 40lbs/ft i think it was, this was then placed in the machine and around 0.0005" taken off to see how the bores looked before the 0.020" hog out and what i found were untouched sunken or pulled back areas of the bores that corresponded to the bottom of the rear stud holes. now this can only be caused by honing without a head plate, installing the head and running the engine.

There were NIL! measurements taken at the time (10years ago) only checks before, during and after honing using the dial bore gauge on the machine.

I'm assuming you would of liked to see a figure of the depth of this shadow in the bore to see if it has any detrimental effect on piston ring sealing ? correct.

I'm planning on having a block done soon with a head plate and I'll see if i can get the figures and some pics but don't hold your breath.

Oh and I've also read that Osama Bin Laden is now living in Florida but sometimes you have to see things to believe them. :)

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

What I heard of ( I'll try to find it) was that they had taken measurments BEFORE fitting the plate, and then after. This was done on various places down the bore. The difference was so little that they concluded that the honing plate was uneccessary.
Maybe I should do some measuring myself. I do infact think I have such a plate available at my local machine shop.

oooh.. thats interesting. explains why i had bother finding a machine shop around here that would offset bore a block.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Why? that has got nothing to do with this... It all about which boring equimpent they use.

i was reffering to the link above vegard, where the chap describes the difference between "boreing" and "honeing" :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.