Hi guys just curious as to what the general consensus is on motors. I want to rebuild a motor for my mini and im just curious to which way i should go. I want it be reliable and get me up a hill with out too much trouble and still be fuel efficient. which way should i go?
Thanks in advance guys much appreciated

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Regards Kermit (TadPole)

1100 - more torque for getting up hills easier.

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"In two years time your car will be like a lady's clothes, out of date, my car will still be in fashion when I am dead" - Sir Alec speaking to Pininfarina

If you have the choice go for the 1100.

Stock 1100 is 10HP and 8ft/lb torque ahead of a stock 998. You don't have to row it up hills with the gearlever.
And they rev OK when breathed on too, just don't overdo it. 6500 is fine, keep under 7000 if you want it to last.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

hi guys thats been the direction I've been leaning toward. As far as revs go i don't let mine rev too high any way nohing over about 4000 revs. I don't feel the need to really. Well if 1100 is the way to go then it's just gonna be a case of finding one that has blown rings or similar and rebuilding it with some nicer gear and new bearings gaskets etc

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Regards Kermit (TadPole)

if you are interested I rebuilt a 998 to go in my delux and while it was apart I spent a bit of money on it with a mild cam (not overly wild) I had bigger valves put in the head and ported it, had the engine balanced increased the compression a little bit, and fitted twin HS2 su's and extractors. The end result was quite a nice torquey engine which has enough power to have some fun with (which I do regularly at the moment) and I am getting resonable fuel consuption.

If you have a 998 use that if you have a 1100 use that, it will be fun either way

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Don't under estimate the power of a Mini

1975 Supercharged Blue Mokezilla
1976 Fudge Moke
1967 BRG & White 67 Morris Deluxe
1974 Clubman Mini S
2005 Red Mini Cooper S
2009 Mitsubishi Outlander VRX

Definitely 1100 over 998 but the cost of a rebuild on a 1275 would be roughly the same, IMO get a 1275 and rebuild it.
The resale value will probably go up by more than the cost of sourcing a set of disc's and 1275 for rebuild.
Do the maths and think about it a while before you start.
Just food for thought.
Rob

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82 BJ42 just completed resto
64 850 Modified(about to start rebuild)

I have an 1100 and would pick it any day over a 998 unless I'm wanting to rev it something shocking. They go up hills easier without having to change gears also

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1964 smooth roof panel van
1967 Mk 1 X-Police cooper s
1970 mini k
1975 leyland

1100 all the way. Keep in mind Tadpole probably still has an early gearbox that probably won't clear an 1100 crank. Go for a Mini K or early chubby gearbox with full synchro and a remote shift, since the hole is already there.

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Brett Nicholson
Greendale (near Ballan) VIC.
1971 Morris Mini Moke
1966 Austin Mini
1965 Morris Mini Traveller
1973 LR Series 3 88
2007 LR Freelander 2

1275... This coming from a small bore lover. 1098 ♥

hmm different turn lol. see i hear that the 1275 are alot more maintenance and aren't as reliable?

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Regards Kermit (TadPole)

Not at all true. If it is built well and driven well then they will last for yonks the same as any small bore would. The problem with small bores though is people tend to over drive them because there isnt enough power and they wear out quicker. Where as the 1275s are sometimes driven to hard because people know the power is there. The most important thing for good reliability is to drive the motor well.

i agree with carter_GT

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Baracade
Relationships! The only time you get to sleep with the enemy!
1972 US Export Moke in Bundaberg QLD

you do have a point there and i agree with you but won't it cost me more to build a 1275? I just dont see how a bigger engine would cost the same that's all? plus i have easier access to a 998 or 1100

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Regards Kermit (TadPole)

Yes they are more expensive to buy. But to rebuild them is almost the same. There still an a series motor so they are practicaly the same, except for sizes of what not obviously. If i was you and you want a nice relaible motor that will last you for years and still have some decent poke i would go for the 1275. Keep it stock and it will be alot cheaper than a modified small bore motor.

Steve,