another 1098 build
Turbo Mini Forums

Hi all I have been lurking around for a while but am now starting to sort out an engine for my ongoing project
Started off with a. 998 in mind then read about 1098 and like the sound of them producing more torque.
So sourced a 1098 crankshaft which I have just had checked and reground. I am going to use a 295 head measures around 2.75 Renault 5 turbo. From what I've been reading hypatec pistons from mini sport aus should be good or are there better alternatives' around. Any help is much appreciated
Thanks Pete

Hello.

The hypatec pistons that MS Uk used to sell were amazing. The Aus ones are not as nice. The best pistons are the Omegas, but lots of money and for the 998 not the 1098 (so pin height is different I think??? not sure).

Turbo choice and head are just right.

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

www.twin-turbo.co.uk

Thanks for your reply wil looks like I may have to do some ringing around looking to run about 10 -12 psi of boost so do you think the aus hypatecs will be ok if I cant source any others.

I recently bought some 1098 pistons from Calver ST. Look the same as the Minispares ones.

https://www.calverst.com/webshop/engine/cst...0-040%E2%80%9D/

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."

Wasn't sure if CR would be low enough being flat top hypatecs have 6cc dish my thinking was if CR was too low with them easier to adjust by skimming the head but if flat tops give ok CR will go with them

Edited by Pete B on 25th Sep, 2018.

You'll need to lose about 3cc from the pistons or head to bring the CR down to 9:1. If you're using the T2 and and intercooler, then that will be fine.

Probably worth doing a little head work to take out 3cc, deshrouding the valves a bit and a general tidy up should do it.

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."

or i reckon yo could get 3cc put into the flat tops ok.

Spot on thanks for the knowledge will order up some calver st ones

Thanks for the advice so far .I have got a set of calver st pistons +40 dropped off my block head crankshaft camshaft to an engineering works .He has asked me what head gasket I am planning on using from what I can see on old posts a good quality copper gasket is the best way to go can anyone confirm this? Thanks Pete

Hey Pete, hows yours going, i've just joined and am doing the same build pretty much

Slow progress at the moment I've had the block re bored +40 calver st pistons sticking with standard rods and crank just all balanced centre main bearing strap .Head was going to just be a freshen up unleaded valve seats and chambers taken out to correct CR .but now going for slightly bigger valves and ports polshed. Going to rebuild my gearbox and fit a cross pin diff .

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