building a turbo 1220
Turbo Mini Forums

Hi i needhelp sorting my engine build. i was wondering if anyone has built one of these before. using a 1098 crank and sunbeam imp pistons. In vizards book it tells me to machine 150 thousandths off the top of the block that got me thinking if i use my 12g202 ported and enlarged to 12g295 chamber size can i machine a little less off the block to lower the compression and run a gt1752 turbo. so some questions is the gt1752 the right turbo? will the pistons hold up? with that many cc's will the 12g295 flow enough or should i pocket the block and go 12g2940. as far as power ouput that i would like to get anthing over 120 thanks for your help

That seems like an awful lot of work to get a few extra CC. You can get the same amount of additional torque with a couple of pounds extra boost and a more reliable engine.

Not sure if you can actually get Imp pistons anymore. If you can, then they are likely to be expensive and unproven under boost.

You can easily get 120hp from a 998 Turbo and with a bit more effort, 150-160 is possible.

It is generally considered bad practise to use the bore to enlarge the combustion chamber. It has been done and it does work, but I thnk that you are better off getting the head opened.

The 202 may be a little restrictive without a lot of work. My 998 gets 120hp on a standard 12G295, so that would be my preference.

A T2 may be better than a GT1752 for 120hp, but you will soon want more power, so I suggest that you start with the GT1752.

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."

I agree, all that work, for something a little smaller than a 1275. Better to use a 1275, parts are more available and proven.

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

Many on here have tried to reinvent the wheel and have seen the light and gone with what has been proven. A lot of unknowns in what you have presented by no means a bad idea just a path never taken go 1275 my friend.

Own the day

Or a +60 1098 with Oz pistons if they are still cheap ?

I don't know if you are aware but engines are going back to the roots.
The 1,2 VW they just released (I red about recently) is long stroke, tub shaped head, two parralel valves per cylinder and turbo !

Rusty by nature

I've built a turbo 1132 with OZ pistons. That'd be much simpler.

Imp Pistons are EASY to aquire though.

http://www.hillmanimpspecialists.com/pricelist2.htm