Question for Mini boffs A+

Post by **paulk** » Wed Mar 08, 2006 5:11 pm

I was just looking at

http://www.austin-rover.co.uk/index.htm?ado28storyf.htm

When I noticed that the 1098 engine and 998 engine share the same Bore.

Now thinking aloud

If so, using a 998 A+block and head but with a 1098 crank and rod/pistons you would have a 1098cc A+

Is this right and if so is there any advantage?

All I know about A+ minis was that they seemed to be quieter and were more economic due to being tuned for 4* rather than 2-3* fuel

Post by **bmcecosse** » Wed Mar 08, 2006 8:12 pm

What you say is correct - for a Mini! The Mini block is no use in a Minor because there is no raer bearing oil seal. the 998 head has the small inlet valves - so this would restrict the breathing on a 1098. The 998 A+ engines have nice flat-top pistons which give CR of 10:1 with standard head. Rover finally realised (after some 30 years) this was a way to improve the fuel consumption. These pistons and rods can be used with a 948 crank in a Minor 1098 block to give a Minor 998 engine. Fit an MG Metro cam and a 12g940 head from a 1275 engine (need block pockets or sink the ex valves 40 thou) and you would have a 'flyer'.

Post by **paulk** » Thu Mar 09, 2006 8:14 am

Cheers BMC I knew it couldn't be that easy

Post by **bmcecosse** » Thu Mar 09, 2006 8:14 pm

But it is easy! And inexpensive. Best value for money power increase you can ever hope for.

Post by **paulk** » Fri Mar 10, 2006 9:45 am

This has given me Ideas.

What sort of Carb would you need?

Are we now talking a seriously Hairy car that needs major suspension/ rear axle upgrades or something that could run a tweaked standard setup but with the obvious brake upgrades?

I think I need to get my grubby mits on a copy of Vizzard and start scrabbling around the local scrappys.

Post by **bmcecosse** » Fri Mar 10, 2006 4:13 pm

Oh these mods will just turn the wick up nicely - not a competition engine! Bigger single SU is way to go - either HIF 38 or perhaps HIF 44 - on MG Metro inlet manifold (about £5 on ebay) - as are the carbs, maybe £10 for the 44.

Post by **paulk** » Fri Mar 10, 2006 4:32 pm

Looks like my christmas list is sorted then

Post by **bmcecosse** » Fri Mar 10, 2006 8:00 pm

That's a long time away - get on ebay now and set up a few searches. There are many bargains out there!