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Which is the best way to tune an 850?
Posted: Sun Apr 03, 2011 9:57 pm
by coopertim
I'm looking to improve the performance of my totally standard 850. The engine has done a genuine 46,000 miles. The Mini has been converted to dry suspension and is fitted with Hi Lo's and will be running 4.5 'S' wheels. i would like to add a period tuning set up without re mortgaging the house
Any suggestions or items for sale greatly appreciated.
Cheers. Tim.
Re: Which is the best way to tune an 850?
Posted: Sun Apr 03, 2011 10:02 pm
by vegar
Re: Which is the best way to tune an 850?
Posted: Sun Apr 03, 2011 10:05 pm
by Simon776
Stick a 1098 in it - that was all the rage back in the day!
Re: Which is the best way to tune an 850?
Posted: Sun Apr 03, 2011 10:11 pm
by 59fan
Shorrock.
Not especially cheap but ideal for a standard 850, just bolt on and go.
Ian
Re: Which is the best way to tune an 850?
Posted: Mon Apr 04, 2011 7:37 am
by mk1
There's a bit of info here;
viewtopic.php?f=3&t=531&p=3157&hilit=850+tuning#p3157
In general a decent cylinder head, modiofied or a 295 ground down to give a decent CR. 1.5 rockers or a mild cam swap, twin H1's, H2's or a single 1.5" carb, decent exhaust & manifold.
Will give you an 850 that can just about keep up with modern traffic & will remain reliable. Much more than this & it starts to become a pain.
Or as simon suggests stick a good 1100 in, they look the same but go much better.
Re: Which is the best way to tune an 850?
Posted: Mon Apr 04, 2011 6:56 pm
by ivor badger
What age 850? as early ones only had a front camshaft bearing and the rear at the oil pump would wearout through the block. What carb do you have?
Re: Which is the best way to tune an 850?
Posted: Mon Apr 04, 2011 7:23 pm
by coopertim
Its a May 1965 850 Super Deluxe. It has the standard original carb.
Simon thanks for the sugestion - im on the look out for a decent 1098 now!!
Mark. Thanks for the link.
Tim
Re: Which is the best way to tune an 850?
Posted: Mon Apr 04, 2011 8:26 pm
by ivor badger
coopertim wrote:Its a May 1965 850 Super Deluxe. It has the standard original carb.
Simon thanks for the sugestion - im on the look out for a decent 1098 now!!
Mark. Thanks for the link.
Tim
65, then it won't have rear camshaft bearings. Just remove the aircleaner, fit short ram pipe and EE3 needle (needle is from memory). then you won't need to bother with the 1098 engine.
Re: Which is the best way to tune an 850?
Posted: Mon Apr 04, 2011 8:55 pm
by KA2S4
ivor badger wrote:coopertim wrote:Its a May 1965 850 Super Deluxe. It has the standard original carb.
Simon thanks for the sugestion - im on the look out for a decent 1098 now!!
Mark. Thanks for the link.
Tim
65, then it won't have rear camshaft bearings. Just remove the aircleaner, fit short ram pipe and EE3 needle (needle is from memory). then you won't need to bother with the 1098 engine.
He jests.
Re: Which is the best way to tune an 850?
Posted: Mon Apr 04, 2011 9:37 pm
by Toby
I should have a set of twin H1s for sale soon, they were quite a common tuning option on 850s.
Similar to these :
Re: Which is the best way to tune an 850?
Posted: Tue Apr 05, 2011 12:38 am
by ivor badger
KA2S4 wrote:ivor badger wrote:coopertim wrote:Its a May 1965 850 Super Deluxe. It has the standard original carb.
Simon thanks for the sugestion - im on the look out for a decent 1098 now!!
Mark. Thanks for the link.
Tim
65, then it won't have rear camshaft bearings. Just remove the aircleaner, fit short ram pipe and EE3 needle (needle is from memory). then you won't need to bother with the 1098 engine.
He jests.
Nope
Re: Which is the best way to tune an 850?
Posted: Tue Apr 05, 2011 7:51 am
by mk1
im on the look out for a decent 1098 now!!
Funnily enough I have a very nice one out of a low mialage Austin 1100, that's complete (more or less) sitting at the back of my garage.
Contact me direct if you are interested.
Ivor is correct in saying that the 850 does not have cam bearings, but this has never been a problem on my modified 850 or any of the others I know of. It could be if you decided to use big heavy valve springs & rev it like the clappers though.
Taking off the airfilter & changing the needle will to all intents & purposes do bugger all.
Re: Which is the best way to tune an 850?
Posted: Tue Apr 05, 2011 8:32 am
by 999 ORX
Ive just bought a 63 super deluxe for my old mum to run around in and thats been 'breathed on'
. Its putting out a 'wopping' 40.5 bhp and 41 pft. It has a minisport stage 3 head, 1.5 carb and RC40 exhaust. This is how i bought it but id much prefer to see it with the pea shooter exhaust on as i much perfer the sound on deceleration, but you cant have both! It is nice to keep them period though and id possibly be interested in a set of twin h1's for it if they come up for sale Masnarda .
Re: Which is the best way to tune an 850?
Posted: Wed Apr 06, 2011 9:19 am
by mk1
The 1100 engine that I mentioned above is now sold.
Re: Which is the best way to tune an 850?
Posted: Wed Apr 06, 2011 11:33 am
by ivor badger
999 ORX wrote:Ive just bought a 63 super deluxe for my old mum to run around in and thats been 'breathed on'
. Its putting out a 'wopping' 40.5 bhp and 41 pft. It has a minisport stage 3 head, 1.5 carb and RC40 exhaust. This is how i bought it but id much prefer to see it with the pea shooter exhaust on as i much perfer the sound on deceleration, but you cant have both! It is nice to keep them period though and id possibly be interested in a set of twin h1's for it if they come up for sale Masnarda .
Strikes me that leaving it std and changing the needle would have done more. Btw Mk1, have you actually tried changing the needle on an 850 HS2?
Re: Which is the best way to tune an 850?
Posted: Wed Apr 06, 2011 11:53 am
by mk1
Btw Mk1, have you actually tried changing the needle on an 850 HS2?
No I haven't but I very much doubt it would make as much difference as the mods I suggested or fitting an 1100 engine. I am however always prepared to be proven wrong.
