Piston sets
Turbo Mini Forums

Andrew has emailed me some more pictures of the "good" 998 +0.080/100/120 pistons and they look fine. Based on the 20950 design.

The ones pictured above appear to be the 20773 model which did have slots.

I will be ordering a set once I've paid for Christmas.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

so are the 1275 varients as good? anybody have any experience with hepolites??

Excuse my possibly foolish question but........

With a BenRoss head fitted will these 1380 pistons be capable of handling 15+ psi

Thanks

Ross

1986 renault 5 gt turbo
1989 Renault extra
1991 R32 GTR
1998 Mini MPI
1999 Nissan Elgrand

Hi,

Do we have to look for the chrome top ring or the non-chrome ones ?

Thanks in advance,

Rusty by nature

Edited by slammed 66 on 22nd Dec, 2007.

1986 renault 5 gt turbo
1989 Renault extra
1991 R32 GTR
1998 Mini MPI
1999 Nissan Elgrand

slammed 66 you need 18cc in the piston tops and 28 ccs in the head too get the cr to a sane levell of around 8.4:1
i run accralites with 18cc in them and 28 cc in the chambers gives me 8.27:1

iam not sure wether or not you could get 18 cc in the hypatecs i doubt it

Thanks steve.

Just wondered as the price of these is so much cheaper than the accralites.

Shame but i guess im just going to have to save a little harder :)

1986 renault 5 gt turbo
1989 Renault extra
1991 R32 GTR
1998 Mini MPI
1999 Nissan Elgrand

I'm just about to flash the plastic.

Any feedback from anyone who bought some recently?

How long did it take for them to get here?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Minisport dude: How big is the dish on the 1098 +040 piston set I bought from you? Just need to calculate some compression stuff.

I can't believe that no one has got theirs yet.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Mine have not arrived yet, Andrew is checking the courier now and seems to be on the ball. I ordered some stuff from the US too and that took 3 weeks over xmas, normally 4-6 days. Hopefully this is just a xmas glitch and so far I am happy that they are doing everything they can to solve it.

Will let you know when they land.

Cheers

Check out the (slow) progress at.......
http://www.turbominis.co.uk/dn89mini

Guys, i bought a few sets last year, (or is it the year before?) anyway, expect them to get stuck in customs! and also expect some stupid "handling fee" by Parcelforce along with the Duty fees.. i got stung on these, but still worked out cheap tho. You MAY get away with it... but if they do get caught, expect it to be a few extra weeks...

i found Minisport Aus to be really helpful though, as i had a ring missing in one set, which they replaced no probs.

As a side note for Minisport, where can i get replacement ring sets for these in UK? will AE 73.5 ones fit? or how much is a set? (+114's)

Cheers

Ross.

Edited by mini-marauder on 8th Jan, 2008.

Sooperdooperturbocooperexpertengineering!

Has anyone used these pistons in a 1293. Just wondering what they are like. The price seems great but are they worth it. What kind of boost will they be ok with.

Thanks
Luke

Somebody dropped me a line about this thread. Most of you know I steer clear of forums these days - the internet may be a fantastic leap forward in communication/information - but unfortunately there are many faceless, chinless wonders out there that hide behind computer screens and take pot-shots at others aor just cause trouble through inconsideration and nothing better to do.

I haven't read all the postings in this thread - but I'd just like to say that this issue with the MSC Mega Turbo pistons is a relatively recent thing (I know Turbodave has used them for years without trouble, and they have sold heaps over the year without issue). Unless MSC get the failed pistons back for inspection it is going to be impossibe to reach a conclusion as to what is happening and why. I have aksed but as far as I know none have turned up at MSC yet. It is a littel unfair for folk to blame a product when the vendor has not had teh opportunity to research the problem.

There are basically two things that cause the land to break away between top and second rings - either manufacture defect or massive detonation issues.

On the subject of other pistons - the 998 flat tops that MSC sells are not manufactured or copied from the Precision Components ones that Minisport Australia is giving away. And why would you need a dished 998 piston for turbo use? You cab get a massive chamber capacity into a small-bore head.

And the MSC/Russell Engineering 73 & 73.5mm pistons work very well in turbo motors - theyhave a better-arranged ring pack than most and a far better squish area than most - tghe shape was developed and extensively tested by Graham Russell on his dyno.

Hope this info helps a little - and please - those folks out there that have MSC Mega pistons that have failed - return them so they can be examined.

Cheers, KC

I dont like the idea of those slots :/

The 998 variants, personaly I wouldn't use (mine my own opinion) for any high performance engine. Those oil drain slots are huge, I dont think it would take long for the skirt to part company at 8000rpm?? Visard warns of this! They are also still the four ring veriety.

The 1275 variant piston look almost identical to the AE 21251/3 or the Standard Rover 21962/3. The oil drain slot and slipper design is the give away. What is the difference between these hypatec and the ones i mentioned above? I would have no issue using these in a fairly standard NA or Turbo motor, but would be skeptical of their use at 8500rpm or medium to high boost Turbos.

These are standard replacement pistons, at a reasonable price. The lead time is an ssue it would appear

The Mega pistons are a performance piston good for 8500rpm, and proven with 240bhp without failure so far. Yes there have been failures i know, but is this enough to condem them as useless?

The Graham rusell pistons 'look' similar, however, they do not have oil drain slots, but rather holes, as per any performance piston.

Please some one start making standard size performance pistons again

This is mine my own opinion.

Tin hat at the ready, ducks for cover.

pop up porn is bestest tho!

Now that could be interesting turning the page while yawning

Andy (minisport-australia), or anyone else who has recently got a set of the 1275 ones, does anyone know how much you could safely machine out of the dish. I'm not looking for lots more ccs in the pistons (I'll try to get most of what I want in the head), but any ideas ?
Rod.

Schrödinger's cat - so which one am I ???

Seems that my pistons arrived in the UK and cleared customs within 4 days, however the muppets at the UK post office in Liverpool have "misplaced" the parcel. Hopefully they have not been sold in the local pub. So it looks like you should have your pistons in 5 days or so as was stated above, just that I have been unlucky this time.

Check out the (slow) progress at.......
http://www.turbominis.co.uk/dn89mini

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

www.twin-turbo.co.uk