Pistons
Turbo Mini Forums

Hi

Has anyone got an idea of hoe much a set of 4 +20 thou pistons/rings and gudgeon pins would cost new.
cheers in advance

for Omega's your looking around ?235

Team Racing

I'm asking cos a mate has got a set, but they seem to be standard replacement ones, made by a company called king pistons, hes gonna put them on e-bay and just wants a ball park figure of there value.

Id say if your looking to sell some "second hand" but new ones id go for around ?100 upwards.

Maybe interested in those pistons, got the specs? cc dish etc.

Cheers
Iain

King pistons use to be anok make... but they are probably very old...

alex

AlexF

they maybe old, history a bit unknown, but they are brand new, set of 4 with rings and gudgeon pins, in original box and still wrapped in wax paper, if you are interested make me an offer and i'll pass it to him, could get pics if you need

Edited by Dicanio on 3rd Feb, 2004.

What cc dish do standard Metro turbo pistons have?

8cc If I remember correctly

Alex

AlexF

I think it was around 9.5 cc, but I can be wrong,
about king pistons, are they good quality ones,
I've got a set of king bearings , and I didn't want to use them (they was old stock) as I didn't know if they were good quality, equal to AE/ vandervell's one.
ie your pistons could interest me if they are good quality ones ( about ok for 130 bhp)lmk
fab

To be honest mate i have no idea, i have tried to find some information on King pistons but have been unsucsessful.
Another question though, if i were to use these pistons, what work would need to be done to reduce the CR low enough to run higher boost.

the work needed is about a day at marking your chamber comb with your head gasket, and then open the side of the chamber gently to this line( from the side of the valves), in making a nice radius with the rest of the chamber design, then you can polish and make a nice area aroud the valves .
Many would call this deshrouding the valves,
it should be enough for any of the low/middle boost set ups, ie 7/10 psi.
don't forget to mesure each vol after, and to mesure your piston dish.
fab

Might sound stupid, but how do i measure my chamber and dish volume. Thanks for the help guys.

You need to get yourself a square peice of perspex about 1 inch wider than you head chamber size, once you have it place it over the chamber in your head and place a mark near the plug hole so that you can drill a small say 6mm hole through the perspex to allow you to poor you measuring fluid through.
When this is done your going to need a Burett (i use a 100ml) and fill it with a mix of 50/50 oil and fuel to make the fluid poor easy, now place a thin layer of vasaline around the outside of the chamber and pop the perspex plate on the top being careful to get the hole over to the plughole this makes it easy to get out small air bubbles while your filling the chamber with the 50/50 mix from the burett, once the chambers full read of the measurement from the burett and this should be the chamber volume in CC.
If you have the valves out of the head put a smear of vasaline on the valve seat before you pop them back in to stop any fluid leaking past the valves and dont foget to put the sparkplug in..

Hope this reads OK.

Karl.

I can post pictures on monday if needed.

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

yes please!!

Ok here's the picture of a standard turbo head with the cc plate and burett.
Note there is no fluid in the head or burett it's just a mockup to give you an idea of what goes on..

Karl.

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

Thanks Karl thats excellent, you my freind are a gent. Cheers

Your welcome...

You might be able to see that the perspex plate has a few holes on it these are for when i use it to measure the piston/gasket/ringland/deckheight volume when the piston is still in the block.

What you can do is take the head off the block leaving the gasket on the block, wind the crank over until the piston is down the bore and smear a thin layer of grease around the the bore where the rings sit at TDC, wind the crank over until the piston comes to the top of the bore and the rings have collected the grease on their way up, with the piston at TDC and the gasket in place put the CC plate over the studs in the block and clamp it down with spacers and nuts until you think you have a good seal.
Now that your confident the piston rings are sealed with the grease and the piston is at TDC the plate is clamped tight onto the gasket and the top of the block you are ready to pour in the 50/50 fluid and get you volume.
This volume + the head volume is used to calculate the Compression Ratio.
E.g. Swept Volume (Divided by the) piston+head+ringland+gasket+deck volume = Compression Ratio.

Karl.

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