998 Turbo
Turbo Mini Forums

Hi,

I am about to emabrk on a 998 turbo project. This forum is a great source of info - just what I need.

I first read the Hugh McInnes book in the late seventies and thought it would be a good idea to see what power and economy you could get from turbocharging a small car. I then got into V8s and forgot about it.

Now I have teenage sons and two Minis in the drive, a 30 and a 35, its time dad got some playtime as well!

(Mod Edit - Moved to 998 section)

Edited by Tom Fenton on 7th Nov, 2005.

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."

Hello and welcome...

why a 998 thou?

Most on here running a 998 are doing so for race class reasons!

Alex

AlexF

The challange for me is to get an economic everday road engine that has lots of power in reserve for when you need it.

The 998 is the smallest engine that you can get decent performance parts that will make it strong enough for a lot of boost.

If they did a 600cc A series, I would start with that!

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."

why not use an 850cc then?

““A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.”” - Jeremy Clarkson

I read the Vizard book about 25 years ago and having dug it out of my loft recently and read it again, got the distinct impression that the 850 does not lend itself to any serious mods. The lack of cam bearings, lubrication to the bottom bearings etc.

I will happily listen to anyone who can convince me otherwise.

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."

Thanks for the good advice mini1071s.

This has given me some food for thought.

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."

Where could one find more info on the 850 crank in a 998?

It's in the works

Holy post excavation batman

The the serch button is your friend

Bookmarked a over a year ago on an old computer that only works half the time. The subject came up on another forum... I was determined. It took about 3 days and tearing apart and rebuilding a laptop to find it. I've got a 998 setting in the garage wait for me to do something with it. Just searching for as much info on options of interest prior to starting.

It's in the works

Blimey, my first post. Almost 4 years ago and I'm only just getting round to fitting the turbo.

There is some information on the 850 crank here:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=255672

and here:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=199572

Edited by Paul S on 1st Jun, 2009.

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."

Thanks for the references. I've been reading them slowly this afternoon. What are the benifits of the larger bore w/shorter throw? I know higher revs but is that where you get the boost in mpg? And my last question for now. Wouldn't your torque and hp figures drop, at least in low end RPM? If I just need to keep reading that's not a problem. I have a habit of jumping the gun.

It's in the works

The same rules apply to a turbo motor as a N/A. So longer stroke = more torque, less revs. As a general rule.

What you have to ask yourself is what do you want the engine for? Is it everyday car, a race car, a track day car. This will determine what spec you need. Unless that is you desperately want a day to day car that is undrivable and unreliable.

IMO using the 850 crank is not needed. Unless you desperatly need to do it for a race class. There is plenty of power to be got from the 998 crank.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.