97 replies to this topic

[Danthefestaman]

Just got my hands on a 1098 engine which id like to build into a fun road engine for nice country lanes.

Im a novice on the mini engine so would need some help and advice,

So my question is what kind of set-up / work should i do? Il buy whats needed to do it but i dont have a stupid large budget.

As it is the head has been skimmed 30thou and it has dished pistons thats all i can say. And it came out of a T-reg.

Il need advice on cam, carb, exhaust set-up, clutch and flywheel to use e.t.c

Thanks in advance!!!

[BlackJester]

Will be watching this closesly, been thinking of doing another engine up as a project for something to do but i am not sure what works best with what.
goodluck!

[Danthefestaman]

Well i hope i can get something put together that is a great engine. I understand the 1098 is a great torque engine so i really want to use it to the most!

[twrminisport]

Head work would be good, either a 12g295 type cooper casting or a 12g940 1275 type (May need to pocket the block- measure first) would be good

Go for a torquey cam rather than a revvy one because you dont want to rev a 1100 too much - the cranks snap if you hold it above about 6k for a prolonged period
However they can make excellent torque with the right setup - try a ACD RT maybe

Carburation - hif44 or twin hs2's would be good.

Ligtening the flywheel is primarily to make the car 'revvier' not necessarily a good idea in a 1098 but some limited lightening/ balancing would be good

Jesus

[Danthefestaman]

Excuse my ignorance what is an ACD RT??

The head on the engine is the 12g202 (think thats right) is that any good with the right work? I want to keep the engine simple as im a novice to the mini engine and in putting engines together full stop!

[PhilipGCaldwell]

ACD RT is a type of camshaft produced by AcDodd of ML Motorsport

[twrminisport]

Top marks to Phil as usual :)
AC Dodd does a range of camshafts, the RT is Road Torque as opposed to RS - Road sport ;)
Simple really :)
http://www.mlmotorsp...id=86&Itemid=30
^^ More info :)

the 202 is an 'alright' head. The difference between that and the 295 head really is the difference in nominal cc as the inlets on both are 30mm, exhaust 26mm. The 295 is easier to modify, however personally i would measure first, pocket the block if necessary and fit a 12g940 head. That way you get 33.2mm inlets and 29mm Exhausts valves as standard which will be perfect for a fast road application. Least cost and hassle really. You could even do the pocketing DIY.

Jesus

[Danthefestaman]

And exactly what does pocketing the block require? Does anyone have a picture?

Can i alter the valves in the 202 head to suit, for example if i get it converted to unleaded could the valves then be alterded to suit at the same time?

Excuse the questions, doesnt mean im ignoring the answers just trying to understand LOL

[twrminisport]

You could alter the 202 head, but it is prohibitably expensive to do so.
The amount of man hours required to get rid oo that much metal and it is a closed chamber head rather than open chamber anyway.
Yes in theory you could do this.

However, you could pick up a 12g940 head (1275) for alot less money than the costs for the work outlined above.

Err pocketing the block is where you 'cut away' a portion to stop the exhaust valve hitting the block due to the higher lift. i think MRA do it for £50. You can do this yourself.
Alternatively you could get a machine shop to sink the exhaust valves into the head to alleviate the problem

The only good picture i can find where it shows this clearly is ...




Sorry Liiarge... You do have some nice illustrative photos though :)

Jesus

Edited by twrminisport, 29 February 2012 - 02:30 AM.

[Danthefestaman]

Ahh right so then you can use the 1275 head and head gasket? Does this ever cause a problem then with the headgasket blowing because of the sealing ring being bigger than the bore??

Well tonight im going to start to pull the block down and just have a fiddle. When i have so free time i will speak to an engine builder i know and he may help a bit! Hes cut some valves into an Escort rs head for me before so he may be able to do it that way.

With regards to cam, if i use the above what rocker gear do i want?
Where is the best place to buy engine parts, i.e nuts studs, gaskets, components?

[PhilipGCaldwell]

engine parts - I never have any issue using minispares or minisport for bits

regards to gaskets you use a 1275 one (BK450), however on the block it is necessary to block one of the water passageways to prevent head gasket failure. Not heard of any/experienced issues with sealing area to bore size problems

[project mini chris]

I hope to building something similar with my 1098... It already has a ported and skimmed 12g202 head and MG Metro Cam in it but I am unsure where to go from there really...
Will be watching this thread!

[Danthefestaman]

Also the chap i got the 1098 off has a 998 for sale soon and he said i could use the flywheel and everything to complete the engine i have as its missing a few parts is this correct?

Also what distributor would i need?
And as for the carb set-up id love twin hs2's but do they come at a cost?? Could a weber be cheaper or would it be far to overkill?

[Danthefestaman]

Just looked at the AC Dodd cam info it says all cams are A+ slot drive only, Would my 1098 be that??

[twrminisport]

Depends on the year.
Worst case scenario you get a slot drive oil pump.
That way you get a new oil pump aswell
Oh and its £15.

Not really a massive expense

Jesus