10 replies to this topic

[Bam]

I am building a 1100 engine for use in rallying.

This is what i am going to do:

Twin 11/4" SU carbs
LCB
K&N filters
Ploished ports on head
double valve springs
lightened fly wheel
balanced crank shaft
peformance diff pin
all bearings changed
all oil seals changed
2 extra engine steadys
6 blade steel fan
lucas sports coil
central oil pick up pipe

Any one have any more ideas, I am on about a £500 budget.

[The Vert]

Well, thats the 500 blown already

[Pavel]

May I ask why you're going for a 1100 engine? These are arguably the worst engines to tune. (Assuming you're talking about the standard 1098cc lump as fitted to clubmans etc.).
If your class limits you to 1100cc, I'd get a 998 engine and bore that out to +60, and use that, chances are you'd get more power, and it'll be a lot easier to tune.

[Bungle]

a 1098 is just a long stroke 998

so tune it the same way

[Sprocket]

Just dont fit a wild cam that increases the rev band into the danger zone that the 1098 suffers from

[Bam]

wel i already have a 1100 (1098) engine in my mini and i was going to tune the one because you do not realy hear of tuned 1100 engines. i will have to take my mini of the road for a bit to strip the engine down and re build it which is making me think that i should tune a diffrent engine and then fit that.
what shal i do?

[Pavel]

Ever wonder WHY you don't hear of tuned 1100 engines?

I'd take that 998 and give it a proper rebuild. For 500 notes don't expect it to fly by any means, and if you want just cheap power forget any rebuilding, get a good condition metro 1275 engine for something like 100-150 quid (more than enough), then you can treat it to a new camshaft, stage 1 kit and cross-diff pin for your 500 notes. Might even have some left over for the rolling road session which you'll need anyway.

[Bam]

i am thinking that i will tune my 1100. the problem is that the con rods can brake above 6000 rpm. how can this be over come as i want to change my cam. can i fit 998 conrods and change it to a 998? or can i buy stronger ones? my budget ca be made bigger if i really need to.

[Bungle]

i'm guessing it a crank change needed

[Jammy]

You can have work done on the rods to strengthen them. Shot peening I believe.

[Steamo]

Have a look on the minispares website there was a great Kieth Calver article on there about tuning the 1100 engine.

I think he did exactly the same to a 998 and a 1098 (stage 3 head, SW5 cam etc IIRC) and the 1098 made a much better engine.

A few snippets:

"The 998 was good - but the 1100 is stupendous."

"Far from being the 'non-revving, boring, slug motor' the 1100 has been drubbed with, it's a very capable engine that gives exceptional results for little cash input."

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