Davenger
Club Retro Rides Member
It's only metal
Posts: 7,272
Club RR Member Number: 140
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A-series tuningDavenger
@dminifreak
Club Retro Rides Member 140
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Dec 16, 2010 23:29:06 GMT
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Skimming the head will get the compression back up. The main problem will be matching up the main bearings. It would have to be a pre A+ block because they didn't make an A+ 850 Hang on a sec. I seem to recall 850's having a 3 bearing crank, as opposed to the 5 bearing crank of the other engines so all this theory is pointless
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Dec 16, 2010 23:32:23 GMT
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All A-series are 3 bearing crank. I believed the B-series did come in 3 and 5 bearing form.
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Click picture for more
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Davenger
Club Retro Rides Member
It's only metal
Posts: 7,272
Club RR Member Number: 140
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A-series tuningDavenger
@dminifreak
Club Retro Rides Member 140
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Dec 16, 2010 23:34:22 GMT
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Yeah, I was just looking into it. all 3 bearing. Been a while since I had one apart ;D
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Dec 16, 2010 23:46:30 GMT
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I said interesting, not cheap Doesn't "interesting" almost always translate into "expensive"? ;D If it is about "interesting" A-Series tuning, I second the BMW K-Head conversion. Mmmh - should realy crack on with my own, now that I think of it...
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Gilesy
Part of things
Posts: 229
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1991 Mini Neon - Gone 1991 Polo Coupe - Gone 1987 Scirocco Scala - Gone 1991 Scirocco GTII - Gone 1980 Mini 1000 - Gone 1998 Fiesta - in flux 1999 Saab 9-5 2.3t SE - the tidy, blown Swedish modern
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Well, if you're going to get really silly then there's always Kent Auto Developments for mini engines up to 180hp! www.kad-uk.com/16v-engine.htmThere's a mini which was recently built here in South Australia by a local mini shop for a customer with a KAD engine, it's amazing. I'm not sure how much has been spent on it but I know for a fact that it's cost more than a new MINI Cooper!
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That doesn't amaze me at all. In The Netherlands I know a shop which rebuilds Mini's for Bini money, but you will get a Honda Vtec in it.
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Dec 17, 2010 20:32:24 GMT
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apparently the specialist components kit costs about 10k to get a very good reliable engine. The most expensive bit of the build is having the block re drilled to accept the k series head. Its a very good conversion tho especially if there is a turbo on it aswell ill leave this here. and this. www.force-racing.co.uk/our-projects-kad-16v-turbo/Nick
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Nobody dies a virgin, because lifes curse word us ALL
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Dec 18, 2010 19:18:31 GMT
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The fun of BMW conversion is that is DIY. The SC kit is great but it isn't low budget anymore.
Anyway back to topic. I just browsed an example of tuning the classic Mini by Clive Trickey. Here is the list for a stg 1/2 850:
Cilinderhead -Skimmed head, maximum 0.070-0.080", cr 9.5:1 -reworked combustion chamber, deshrouding the valves -gasflowed ports, valve throats, valves and seats -tapered valve guides -Sprite Mk2/ Cooper valve springs -Larger inlet valves from 1100 or even MG1100
Carb -SU HS2, blue spring and E3 needle -thinned downed butterfly -heat shield between carb and exhaust -or SU H4 (including slim downed butterfly) or twin carbs (2x H1)
Exhaust -AH Sprite mk1 silencer
Fan - 4 blade fan
But the book was written in a time where 1275s were scarce and labour cheap and technology was expensive. So they did modify a lot of stock parts.
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Dec 19, 2010 17:25:06 GMT
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-SU HS2, blue spring and E3 needle -thinned downed butterfly There's very much cross sectional area to gain here, especially on a HS2/1.25" carb!! Following pictures are from a HS4/1.5" carb... The modified throttle shaft is about 2/3 thinner! ;D
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Wow, that sure is a very thick throttle shaft to begin with!
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Dec 20, 2010 21:11:41 GMT
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Leave the engine as is until the car is on the road and you're happy with the bodywork and so forth. The most sensible thing anyone has posted so far in this thread, though the advice to get the Vizard if you are going to start messing about is a very close second (though my copy has a blue cover not a yellow one). If I remember correctly the OP is not even of driving age yet? Rebuild the engine as stock, maybe using a few of Mr Vizards efficiency tips along the way, get the thing running nicely and learn to drive. You're going to get rogered mercilessly by the insurance man to start with anyway, present him with a modified car and he'll be going in dry.
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Yeah, I wouldn't even bother rebuilding the engine to stock specs. Just leave it in whatever condition it is now, even if it doesn't run! The bodywork has a very long way to go and a lot of time and money still to be spent on it before it even needs an engine. Once that is finished then it'll be the right time to think about engines. Building the engine may be the 'sexy' part of restoring a car, but the bodywork is most important!
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