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850 Is So Much Fun


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#1 ads7

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Posted 11 May 2019 - 06:48 PM

Well last Saturday I had a brilliant drive on my usual route from Oswestry to Bala via Llangynog over the mountains. First time I've really pushed the car with the recently fitted 850 engine.

Surprised by how it revved to 40mph in 2nd, 60 in 3rd, never had such fun in such a low powered car!

I'm aware of the inherent crank weakness at too high sustained revs so I won't be abusing the motor on a regular basis.

If you haven't driven the route mentioned I'd highly recommend it, just be wary of numerous sheep going over the high ground. I'm lucky to have these roads on my doorstep

#2 unburntfuelinthemorning

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Posted 11 May 2019 - 06:56 PM

That's why Minis are so much fun, enjoy.



#3 GT Jimmy

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Posted 11 May 2019 - 06:59 PM

Used to visit Bala on my bike, great roads, had many a near miss with those sheep haha

#4 mab01uk

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Posted 11 May 2019 - 07:21 PM

You might like this old thread......

 

Tuning The 850 Engine, Formula 850:-

http://www.theminifo...ne-formula-850/


Edited by mab01uk, 11 May 2019 - 07:22 PM.


#5 unburntfuelinthemorning

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Posted 11 May 2019 - 07:24 PM

It's the Muntjac deer you have to watch round these parts, and the mamils.



#6 ads7

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Posted 11 May 2019 - 09:08 PM

Thanks for the link to tuning thread, very interesting. Think I'll enjoy wringing the best out of the car on a budget until the current engine dies then try a modded 998. I've already been down the 1293 route and find I'm enjoying having to work harder to make progress

#7 DeadSquare

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Posted 11 May 2019 - 10:22 PM

First things first !    improve the brakes and suspension.

 

 

 

The crank isn't as weak as has been inferred in some of those earlier posts, but when you have the cash and strip the engine, having things lightened and balanced, helps a lot.

 

Meanwhile, you can get away without line boring the block if you don't use double springs, just stiffer single springs, which takes valve bounce well over to 6,000 RPM, and a  997 cooper cam won't add much stress. 

 

If you go to something hotter like an "Evo 001" cam, go for double springs and cam bearings.

 

It would then be worth polishing up the ports and chambers, and any time that you get the opportunity,  improve the exhaust and carb.

 

850 driving can be fun, because a lot of the time, you don't have to lift off for corners.  If you get too much power you have to start lifting off on bends !



#8 ads7

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Posted 11 July 2019 - 08:55 PM

A few maintenance / mods in process - acquired a 'Minnow Fish' carb in quest for more efficiency. Now have to unseize it and fabricate a manifold to mount it as a downdraft.

Fitting front hilos and probably uprating front shocks to kyb silver.

Head gasket kept blowing between cyls 2 and 3 so had it skimmed 10 thou - was warped and discovered a light crack between 3 and 4 cylinders, covered by gasket so crossing fingers!

Still in love with the car despite constant need for attention!

#9 ads7

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Posted 11 July 2019 - 08:59 PM

Must add the crack doesn't bridge between 3 and 4 cylinders, it runs vertically for an inch leading from the front of the head

#10 Cooperman

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Posted 11 July 2019 - 09:55 PM

If your head has any cracks it is wise to change it. An 850 head is inexpensive to buy and will be reliable.

#11 ads7

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Posted 11 July 2019 - 10:20 PM

Yes I need to source another head if anyone has one available in good shape that would be useful

Edited by ads7, 12 July 2019 - 06:41 AM.


#12 Cooperman

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Posted 12 July 2019 - 12:12 PM

Is a head from a standard 998 any good for you? I depends on what combustion chamber size you need and what pistons your 850 has.

Have a measure and let me know if you are interested.



#13 Algordo1100

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Posted 12 July 2019 - 05:12 PM

Have a 1964 Morris 850 back home in Australia. It is totally standard, original and it is heaps of fun.

She might be 55 years old but enjoys a good thang, as we say.

Just don't like running out of breaks!

At least there's 1970s seatbelts fitted, 'borrowed' from a mini K !

#14 ads7

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Posted 14 July 2019 - 08:48 PM

Is a head from a standard 998 any good for you? I depends on what combustion chamber size you need and what pistons your 850 has.
Have a measure and let me know if you are interested.


Hi thanks for the offer, standard dished pistons so I think the 998 chambers may be too large? Please correct me if I'm wrong

#15 Cooperman

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Posted 14 July 2019 - 09:35 PM

I think you are probably right, but I can't remember by how much the chamber sizes are different. I have a 998 head and you are most welcome to it if it will fit.






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