850 turbo?
Turbo Mini Forums

Has anyone ever attempted to do an 850 turbo? or would there be no point?

No point IMHO

If something is worth doing, it's worth doing half of.

Probably no point, but I wonder how many said that about 998s until the likes of Wil, Ben and Paul got on and made good numbers...

998 is probably cheaper.

If something is worth doing, it's worth doing half of.

Typical John, straight for cheapest....

The reason for us to boost the 998 is for class rules. Paul was to make an eco car (although like many he liked the boost a little too much)

There is no reason not to turbo an 850, depends on what you want. However, the 998 is a better option, if you go small bore, as parts are easier to get.

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Well i was looking at it for purpose of insurance as its a small engine really.
But i then suppose trying to get a descent power output from one would be quite difficult to achieve.

If i tried to go down this route does anyone know what parts i would need?

Problem is with the 850 engine is Cam has no bearings (early blocks), Pistons are only flat top not dished so compression issues, heads are very restrictive, cranks are a bit iffy IMO Personal cost, setting it all up, cost and power gain just not worth doing. 998 Or 1098 would be best option as more than enough parts kicking about for them :)

as soon as you tell insurance you gone turbo the cc size really dosent effect it that much. they more like the bhp figure your engine produces now which i find hard as with turbo depends how much boost etc. you could tell them whatever . but no reason why not you could just do it for the hell of it with building a 998 in the future in mind. blow it and transfer the turbo parts.

My small bore turbo project http://www.turbominis.co.uk/forums/index.php?p=vt&tid=473901

I'm sure years ago there was a guy turned up at Avon with an 850 turbo.

As everyone said I don't see a problem turboing a 850 but you must keep in mind a few things :

- the power potential will be limited (a 998 with a proper head is 100 so I assume a 850 should be 85),

- turbos might be tricky to source (if you don't want power band from 8K to 10K that is)

- parts and machining are gonna be identical to the bigger engines so on a power per £ spend, it is not that good.

But if you already have the engine, I would do like JLay said.

On my opinion though, HiF 44 / restrictor ring setup would need to be scaled down as too big a carb is not very good at lower RPM.

Rusty by nature

Well, if you can convert a HIF44 to work with boost, why not a HIF38? That and a bit of fiddling with the restrictor on the plenum and it should scale down okay?

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

why bring the compression down? leave it the same and boost will come on faster, that might even solve the right size turbo problem as well. You wouldn't be able to run huge boost numbers but you make up some of that power with compression

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I was just thinking about the fuel problem, but I'm sure some of the head wizards on here could size up some chambers to get 9ish? I don't know what it is as standard though... And I'm assuming a 12G295 fits on an 850?

As has already been said it wouldn't make huge power, but i think it would be pretty cool to be the guy who built the first 850t?

And if you're only planning to run 7-12 psi because of the cr, you could keep the standard bottom end? (assuming its the same as the 998) and if you wernt happy with the end result you could always swap the 850 short engine for a 998 one?

Just my 2 pence though, being a complete novice im sure I'll have missed something somewhere

http://www.turbominis.co.uk/forums/index.p...tid=469104&fr=0

You certinally wouldn't be the first.

It is completly possible, and you'd end up with a decent engine, all the turbos that are used on the moderate power 998s will work. My IHI will make full boost at 2.5k, so on an 850 it'd make it before 3, hardly ann issue.

The big problem is what pistons do you use?

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

Vizard dose have a guide to building a 850 hot rod engine in his Yellow bible

I agree with Wil_h though What pistons would you use?

I was wondering if you could use replace them with ones from another engine?

If you can find some with the correct diameter, pin height and pin diameter then you can put them in.

The other option is to have some made, not sure of the cost though.

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

does anyone know of a company that may make them?

You might be able to fit Pistons from a Fiat Panda.
Mahle spare part no. 008 90 00 or 009 01 00.
Or maybe from a Renault Mahle spare part no. 021 25 00.

Pin diameter is to big, but i think it the small end can be bored out. I did it on a 1098.

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Rusty by nature

im assuming the old fiat panda?
Did they do a turbo fiat panda?

Old panda. early ´90. non turbo

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Would the pistons be suitable for a turbo?