42 replies to this topic

[sharps555]

as the title says im just wondering how much you can modefy and how much hp you could grab from a 998?

cheers alex

[Kam]

Give you an insight

http://www.theminifo...x...1&hl=stages

[taffy1967]

John Cooper Garages managed around 60bhp (or close to) with their conversion kits (prior to the launch of the Rover Mini Cooper in 1990).

[sharps555]

thanks kam ive seen that before very usefull but it dont give any indication of hp that you can get from the mods

[Shifty]

How much money do you want to spend?

My 998(now 1015cc) kicks out 68Bhp at the Flywheel and owes me about £1200!!

[minikidx14]

around 150 if you use a 998 r1 engine

[mike.]

How much money have you got is the question...

Wil h on the forum has a turbo 998 pushing out about 150bhp if i remember correctly...

[liirge]

if you take out all the turbo and forced induction jobs, and had a limitless budget..
Then at a push you could put out near 100Bhp, in fact Swiftune told me they had a customer who was running an insane 998 spec, with a Weber 45, and that was pushing just over 100Bhp..
This kind of power can not be used on the road in a small bore, and even if used on the track the rebuilds would constant.
Remember its Torque that really makes the difference, Bhp is just to show off!

Here is My engine Spec:
BLOCK
Surface Skimmed
Over Bore
Honed
Pocketed
Chemical Clean
New Cam Bearings Fitted
Centre Main Strap
ARP Conrod bolts

PISTONS, CRANK AND RODS
Crank Regrind if necessary
Crank Lightened and Balanced (Wedged)
Con rods Lightened and Balanced
Pistons 998+ 120thou inc. Hastings Ring Set making a 1096
Bearings Mains
Bearings Big ends
New Oil Seals, Gallery and Core Plugs

CAMSHAFT and Valvetrain
Swift tune SW10-07
Kent performance Slot Type oil pump
Lightened Duplex Fully Adjustable Duplex Vernier Timing Gears
1.3 Roller Rockers

CYLINDER HEAD AND FUELING
12G940 MG Cylinder Head
Unleaded
35.7 Inlet 29.3 exhaust valves
10.5 - 11 Compression Ratio/ Possible Skim
Twin SU HS4 Carburettors
New Needles
Ram Pipes 3”
Sock Filter
Facet Solid State Fuel Pump with Wired Inertia Kill Switch
Filter and Regulator

GEARBOX
MRA Minis Straight Cut Drop Gears
Gearbox Inspection and Replace where Necessary
FD 3.65
Centre Oil Pickup
Hardened Diff Pin

CLUTCH
Ultra-Light Balanced Fly Wheel and Backplate
Orange Rally Spec Clutch Plate
Friction Plate AP

THE REST
Megajolt V4 Ignition System with Rev limiter
Metro Rocker Cover
Custom Needle Fuelling Profile
Rolling Road Session
Standard Mini Cooling System
New Water pump and Belt
Damper pulley
Extra Engine Breather

I'm hoping to be pushing 80 or just over out of that to give you an idea

Edited by liirge, 15 November 2009 - 03:43 AM.

[sharps555]

wow thanmks for all the replys

liirge why cant you get that type of power into a road car with a small bore?

im only 19 but rely want to have a makeover on my car over a few years of work by myself to help me get to know it would be fun trying to tune the engine up as it rely interests me

[twiggy]

Interesting topic, I always find it entertaining to find people who have 'tuned up' their 998's in Mini mag and similar only to get 50 odd bhp and then you see a standard one in there with only a couple less.

I've driven standard 998's that drive nicer, faster and better than my 1098cc which was 'tuned' to some extent: head, 286 cam, 2" exhaust etc etc

[james962]

liirge why cant you get that type of power into a road car with a small bore?

Possibly due to the power being high up in the rev range, and i would have thought you would need the engine to "come on cam" before you see the power.

How do you find the idling and creaping forward in traffic queues liirge? Any problems or is this why you would not recommend it for a road car?

[liirge]

Not built yet,
but james you have hit the nail on the head, basically:
to get power out of a 998 you will have to put a pretty wild cam in, now on a bigger engine the torque from the higher displacement level alleviates some of the trouble of being off the cam low down. In a smallbore you will find the idle will be all over the place and you will have to rev her to creep forward slightly.
Problem with this is...extra wear on the engine especially the Thrust bearings and the clutch, and when you want to give it some beans you have to REALLY rev it and with that you wear..well pretty much everything, it's all about compromise. If you want a road car that has power and will last years and be a pleasure to drive around town..DON'T really tune your small bore, get a 1275.
Another way you could sort some of this problem is by getting the engine to be over square or nearly square, to do this you will need a 1275 engine and then de stroke the crank, this is costly but i bet the results would be pretty good, they did it with the 997 Cooper S.

Twiggy:
80Bhp is more than little bit than a standard 998, your 1098 sounds like its got a spec with parts that don't compliment each other, would be interesting to hear your whole spec...

[welshdan]

the way i see it (im sure people will disagree), is that if you are willing to put a lot of time,money and effort in modifying a small bore a series, you had might as well start with a larger displacement block (1275), and then spend hthe same amount of time,money and effort on tunuing this, to obtain an engine that will be more powerful than the tuned small bore.

or a mildly tuned 1275 would give the same power as a highly moded small bore, therefore the large bore would be more reliable?

unless you need to keep the small bore for originality purposes (i dont see that modding the engine to extremes keeps it original), or if you have to complete in a form of motorsport that you need to remain withing a certain number of ccs to compete in a certain class, i would persoanlly go for a 1275 based engine.

afterall a moderately tuned 998 for example, will only just keep up with modern traffic, nearly all cars on the market will be quicker, definately the hot hatches.

technology has progressed significantly since the a series was first put into production

[welshdan]

John Cooper Garages managed around 60bhp (or close to) with their conversion kits (prior to the launch of the Rover Mini Cooper in 1990).

jcw also claimed 90 bhp on their later S converted cars. they didnt produce 90bhp at all

[liirge]

Why not do it for:
A. Fun
B. Something different
C. A challenge

also you cant beat the look on peoples faces when you tell them its a 1 litre that's completely destroyed them.