1098 with 2 inch mains

Post by **glyna2006** » Sat May 26, 2007 7:27 pm

does anyone know are the main bearings readily available,i've taken this engine out of a scrapped 66 midget and plan to make a quickish engine out of it for another mog prodgect,ive got a 1275 in my soft top with all mg metro inards,how tunable do you guys recon the 1098 is? regards glyn

Post by **Welung666** » Sat May 26, 2007 7:52 pm

Buy David Vizards book and almost anything is possible ;)

Post by **Willie** » Sat May 26, 2007 8:12 pm

If that engine number starts with 10CC it has the most suitable mains
for any tuning you wish to do. As always there is no substitute for cc's.

Post by **glyna2006** » Sat May 26, 2007 9:51 pm

yea i got vizards book but was wandering about availability of the mains as its a bit of an unusual eng and am getting the head done to run unleaded witha kent cam and vernier pulley I have a few 1275 engines but would like to see what i couls get out of the 1098...glyn

Post by **Packedup** » Sat May 26, 2007 10:39 pm

Aren't the 2" mains the same as 1275 engines?

Whatever the case they are available, but I can't find my Moss catalogue right now to check the quality/ price (and can't be bothered firing up IE just to get their site to work).

As the 1275 is such a common engine for thrashing I'd imagine good bearings should be common enough (I hope so, I'm tghinking of rebuilding a 10CC myself at some point).

Post by **glyna2006** » Sat May 26, 2007 10:43 pm

i seem to think but not sure has the 1275 got 2'' bearings? or are they 1.75?????...glyn

Post by **bmcecosse** » Sun May 27, 2007 9:04 am

The 2" mains are the same as early 1275 engines - it's THE 1098 engine to have - and of course that crank fitted into a 1275 block gives something like 1340 cc on standard bores - and almost 1400 cc if you fit +60 pistons !! The piston crowns need machining down of course to stop them sticking out the top of the block - so pistons with thick crowns are needed - and rings not too near the top either. But it can be done. Usual tuning mods apply - but 1098 crank doesn't like much over 6000 rpm for any time - so don't go for too long a camshaft - MG Metro cam would be ideal. And the biggest valve head you can find! ie Mg Metro (early one) oir better still real Cooper S head.

Post by **glyna2006** » Sun May 27, 2007 9:55 am

so are u saying i can fit a 1275 crank ito the 1098 block,what conrods? would be used,i,ve got a 13 stud s head off a 1300 gt,probably an mg metro late cam the same as i used in my 1275 engine,thanks for advice...glyn

Post by **bmcecosse** » Sun May 27, 2007 10:03 am

Well you could - but that would give something LESS than 1098 cc. The idea is to use the long stroke 1098 2" mains crank in a 1275 block! The head will be 11 stud - not 13 - check the valve sizes, you want them large as possible. 'Kent' cam could be anything - does it have a number stamped on the drive end ? MG Metro cam is very good up to 6000/6500 - loads of torque without stupidly high valve lift to wear out the followers or the guides!