67 replies to this topic

[_mini1000_]

hi guys
im starting to build a fast road 998 and im looking some ideas
itd be great if yous could post your fast road specs and a guestimate of what power its making

thanks in advance

[ministar]

Wheres Wil_h? He has a very highly spec'ed 998 from what I remember!

[miniman92]

998 A series block, 12g295 fully worked cylinder head (35mm inlet and 29mm Rimflow valves), cooper s rockers, fully lightened and balanced bottom end, Close ratio cooper S/GT gearbox, straight cut drop gears, 3.2 metro turbo final drive and hardened diff pin, kent 276 camshaft and iski followers, duplex timing gear, MED ultralight flywheel and backplate, orange clutch diaphragm, aldon electronic ignition, single HIF38 (soon to be twin hs2's) amongst other stuff.

Edited by miniman92, 16 March 2011 - 09:32 AM.

[benpopham]

998cc Block + 0.80'' Pocketed
Knife-edged, wedged and balanced crank
Lighted bigends on rods
compression ratio of 10.75:1
Minispares +0.80'' Mega type flat top pistons
Swiftune 12G940 RR head
3.4 ratio final drive
Minispares CrossPin Diff
Weber DCOE45 using one side
Swiftune SW10 cam
Swiftune timing gears
Swiftune Straight cut roller drop gears 1:1
Swiftune 1.5 ratio Roller Rockers
MiniSport Ultralight Steel Flywheel
Swiftune Ultralite billet back plate
AP Racing Orange diaphragm
Maniflow mini se7en's manifold
Maniflow stage 2 LCB Stainless manifold
Carbon 4 blade Fan
Lightened ISKY cam followers
PoleStar engine management system

Hoping for 90 - 100bhp

Edited by benpopham, 16 March 2011 - 09:58 AM.

[Ben10Raw]

998cc Block + 0.80'' Pocketed
Knife-edged, wedged and balanced crank
Lighted bigends on rods
compression ratio of 10.75:1
Minispares +0.80'' Mega type flat top pistons
Swiftune 12G940 RR head
3.4 ratio final drive
Minispares CrossPin Diff
Weber DCOE45 using one side
Swiftune SW10 cam
Swiftune timing gears
Swiftune Straight cut roller drop gears 1:1
Swiftune 1.5 ratio Roller Rockers
MiniSport Ultralight Steel Flywheel
Swiftune Ultralite billet back plate
AP Racing Orange diaphragm
Maniflow mini se7en's manifold
Maniflow stage 2 LCB Stainless manifold
Carbon 4 blade Fan
Lightened ISKY cam followers
PoleStar engine management system

Hoping for 90 - 100bhp

Niceeeee

when i leave college and earn some real monies i think im gonna go down the long and twisty 998 turbo route

[twrminisport]

From that i think my 998 tuning guide may be of use to you

PM me your email address mate.

Final spec for mine will be A+ block. standard 998 bore. twin hs2's, 12g295 ported big valve head. kent 276 cam, lightened and balanced flywheel with pre-verto clutch.
Central oil pickup and x-pin diff.

Should make 70-80 at the rollers.

Vizard did one similar without the flywheel etc and that got about 72 and was quicker than a metro turbo.

[Stevee]

1060cc engine pocketed
Flat top pistons
Sw5 or metro cam
Duplex timing chain
1.3.1 rockers
12g940 head
stright cut drop gears
4 speed stanard rebuilt gear box
3.44 final drive
centre oil pick up
double valve springs
hif44 carb or 1 1/4" twins
maniflow exhaust side exit
modded water, and oil ways
4 blade fan + eletick for town back up
lighted fly wheels and back plate

should be about 60 - 70 bhp there

[twrminisport]

You should be making 70bhp with that spec Stevee depending on the head modifications.

Where are you going to get 998 straight cuts from

[_mini1000_]

some really nice builds there!
especially that 998 +80 of benpopham! sounds like it will be a bit of a handful

ive got a standard small valve 1275 head 12g940 and a hif44 lying in the garage so i was planning on using those

was thinking of a spec something like:
998 pocketed block
flat top pistons (if funds allow)
sw5 cam
12g940 small valve head with unleaded conversion and ported a bit
lightened flywheel
centre oil pickup pipe
hardened diff pin
hif44 carb
cooper freeflow exhause manifold
rc-40 twin box system

what does everyone thing?

[Stevee]

You should be making 70bhp with that spec Stevee depending on the head modifications.

Where are you going to get 998 straight cuts from

ebay jobby some one makes convertion bushes to use 1275 drop gears on 998 ;]

[liirge]

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 (MiniSport)

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

[george91]

Here's a link th Wil/Ben's 998 turbo.

http://www.twin-turb...k/The Spec.html

[1984mini25]

Standard bore 998 pocketed A+ block
Polished and balanced crank
MG metro camshaft
Duplex timing gears
Standard refurbished 12g940 cylinder head (I’ve got another spare that I might play around with)
Mainflow inlet manifold
Hiff38 carb and k&N cone air filter
Minispares lcb
Twin box centre exit mainflow exhaust
Fully refurbished gearbox with central oil pick up and 3.4 diff.

Should be enough to get it moving while I come up with the funds for engine number 2

[Pyntas]

A-series 998cc Block + 0.40'' Skimmed, pocketed, oil and water channels mod for the 12g940
Bladed, polished and balanced crank (A+)
Lightened polished and balanced Rods (A+)
Stage 3 12G940 whit STD valve size (33/29) special made for this engine, giving about 10,5:1 Compression Ratio
STD flywheel lightened
Minispares light back plate
Keith Calver RE13OT camshaft
Lightened cam followers
1275 Pressed steel Rockers (1.27:1)
Lightened Duplex Vernier, full adjustable
Hif44 carb, on howley maniflow, modified to match the 44
3" Pipercross rampipe
Freeflow manifold, SS centre line, and rc40
STD 998 A-series gearbox whit 3,44 final drive, full recon and reinforced diff whit EN24 pin, windage tray fitted
Running on Bestek ignition, Rally curve

Soon I will change for Megajolt and customize the needle

Edited by Pyntas, 29 April 2011 - 12:18 AM.

[twrminisport]

And the figure for the above spec is...