22 replies to this topic

[minimanpage]

good evening mini fans!!!

i have been given a 1098 engine in bits with a mark one cooper gear box, its seen better days so while its in this state i wanner see what i can do to it and i mean anything, or is it better if i try getting a 1275?

seriously any help is good



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[Cooperman]

The 1098 engine is very long stroke, but it can be made into a good engine with stacks of mid-range torque and reasonable power. a high-revver it will never be.
However, if you are going to have to do a complete re-build, you might be better trying to find a decent 1275 block, crank, head assembly. re-build costs would be similar and the 1275 is a much better bet really.

[benb12]

Check this out:

http://www.calverst.com/cc110f.htm

Click on engine, then on the link "Engine - 1098, initial tuning potential", it's an interesting read if you have a 1098.

[MRA]

Indeed, David Vizard used to race a modified 1098, ie 1220 or so in the 1275 class wheb 1275 engines where expensive...... Not good for high revving try for maximum low end and mid range torque and fit a higher final drive to use the torque and also maintain some road driveability..... ie motorway useage

[bmcecosse]

Put a 940 head on it - decent carb and exhaust, maybe an MG Metro cam - you won't be disappointed. But don't try to rev it over 6k!

[Cooperman]

Put a 940 head on it - decent carb and exhaust, maybe an MG Metro cam - you won't be disappointed. But don't try to rev it over 6k!

............ or it will probably blow-up!

I once had an 850 Mini into which I put an MG 1100 unit with a 731 cam.
It went well, well it went too well until I put decent brakes on it, but I daren't rev it like I used to rev my old 998 Cooper. I did a deal to sell it and got a 1275 'S' with a standard lump. I must say the 1275 was a much better road car. But, hey, that was back in 1969 - 40 years ago now!

Going back to the original post, one has to say that if the 1098 engine needs a re-build, the OP is probably better going for a decent 1275 engine. I just bought an A+ block and crank assembly for not a lot of money. I've yet to take a good look at it, but I think it's standard bore and crank with little wear. Going to take a better look tomorrow.

[Big_Adam]

Oooooooooow, what can you do with a 1098,
What can you do with a 1098,
What can you do with a 1098 early in the morning!

Way hey, where my Vizard?
Way hey, where my Vizard!
Way hey, where my Vizard early in the morning.

1. Sling in a 1275 cc,
2. Keep it stock sling in a turbo.
3. Pull out the plug and rebuild him up again,
4. Take 'im and shake with a lumpy cam again.
5. Trice him up on a rollin' road.
6. Give 'im a taste of the SU Twincarbs.
7. Give 'im a dose of NOS.
8. Stick on 'is back a fiddle with timing.
9. Shave his seams and make him smooth again.
10. Send him up the tuner till it falls down again,

...

Crap. Can't think of anything good for the rest.

[benb12]

Oooooooooow, what can you do with a 1098,
What can you do with a 1098,
What can you do with a 1098 early in the morning!

Way hey, where my Vizard?
Way hey, where my Vizard!
Way hey, where my Vizard early in the morning.

1. Sling in a 1275 cc,
2. Keep it stock sling in a turbo.
3. Pull out the plug and rebuild him up again,
4. Take 'im and shake with a lumpy cam again.
5. Trice him up on a rollin' road.
6. Give 'im a taste of the SU Twincarbs.
7. Give 'im a dose of NOS.
8. Stick on 'is back a fiddle with timing.
9. Shave his seams and make him smooth again.
10. Send him up the tuner till it falls down again,

...

Crap. Can't think of anything good for the rest.

I just had to sing that... worked well til I got to verse 8.

[liirge]

if its an 1100, than its most likely going to need a rebuild, as they are real Oil burners when they got old.

[minimanpage]

hmmmmm okies, my main mission is to build a mini to break the 100bhp, i drive a 1275 at the moment but building another seems more fun. soo is that even possible with a 1098.

also does it matter what gearbox to use because i have a mk2 cooper gear box


thanks for the help any info s better then no info

[liirge]

Urrrm, it is possible but the cost would be prohibative, infact it would be ridiculous.

[minimanpage]

Urrrm, it is possible but the cost would be prohibative, infact it would be ridiculous.

soo could i keep the gearbox and change the head then for a 1275?

[Sherlock]

You could bore out the 1098 & create a replica of the old Speedwell 1152cc engine, an engine I always liked & am considering doing one for my Mini. (Even that didn't break the 100bhp)

Edited by Sherlock, 18 October 2009 - 08:50 PM.

[liirge]

You could bore out the 1098 & create a replica of the old Speedwell 1152cc engine, an engine I always liked & am considering doing one for my Mini.

Have you got any more information about that engine?

[Sherlock]

You could bore out the 1098 & create a replica of the old Speedwell 1152cc engine, an engine I always liked & am considering doing one for my Mini.

Have you got any more information about that engine?

I do have more information ,but some of it is hidden away in my archives (in other words can't quite remember where I put it!) but what I do have to hand, it had a highly modified 12g295 head, cast in alloy, but it turns out it was not 1098 based, it was a very much overbored 997cc Cooper block, which for some reason had a 998 Cooper crank. It produced 90 bhp at 7,500 rpm & ran on twin 1.5" SU's. The idea of an 1098 based replica of this engine actually came from an engine machinist as a more affordable way of getting a similar engine, although it would not rev as high. Sorry for that confusion, but now I have retrieved my info, it all comes clear, but I think I shall have a go at it when time (& finance) permits.

Edited by Sherlock, 18 October 2009 - 10:44 PM.