67 replies to this topic

[craig 1010cc]

Rob walker +0.20 bottom end (1014)
Kent 256 cam
Rob walker stg2 head
Cooper freeflow
Single box Maniflow (1.625" if I remember right)
HIFF44
3.44 diff with central oil pickup

Made 62BHP and was an awesome road engine

[danrock101]

I reckon if you had swapped the hif44 for a hif38 you would of gained a couple of bhp and a bag tourqe

[craig 1010cc]

we couldn't get the fueling in a HS4 right, but on the HIFF44 (with a needle that was normally used on a 1380) it worked fine, mixture was spot on through out the range so we went with that. The plan was to go to a set of twin HS2's but then I sold it

[Wil_h]

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

All my 998s make over 100bhp, but all are turbo'd. Had one on the rollers last week and made 178bhp. Zoooooomm

[sir Jake the brit]

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

can you get 100bhp from an NA 998mini?? if so thats awesome!!! good luck fella!!

[Pyntas]

And the figure for the above spec is...

A very fun engine to drive, should give about 60hp and a good torque.
Will go to the rollers to tune the megajolt, can anyone recommend a good map for this set up? I'm thinking in put the Aldon yellow map and start from where....

Edited by Pyntas, 30 April 2011 - 08:12 PM.

[danrock101]

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

can you get 100bhp from an NA 998mini?? if so thats awesome!!! good luck fella!!

seen over 80 at the wheels before

[sir Jake the brit]

seen over 80 at the wheels before

so that would be near enough 100BHP @ fly!

[minimender]

998 from scrap Metro

MG Metro cast LCB

MG Metro cam

Standard 1275 head from old Metro

reprofiled valve stems

MG Metro valve springs

MG Metro 10 degree distributer

Lightened flywheel and backplate (Machine Shop)

MG Metro inlet manifold

HIF 38 with modified needle

1275 air filter housing and filter

Metro gearbox with (3.6 diff)

Engine put together from bits from scrap cars, dont know output as couldn'd afford rolling road but the Mini would outdrag 1275's easy and would pull strong up to 95mph on the speedo which was probably about 90.
Revs peaked at 7500rpm and the power came in gradually from 2000 being strongest after 3500 then tailing off at about 6000.

Lost bottom end torque but gained it at top end, 998 should spin wheels on half throttle pulling out of junctions but big valve head spoiled all that. It would have been far better with modified 998 head keeping smaller inlet ports in my opinion.

Did put an 8 degree distributer on it off a Mini E that I scrapped and that improved the bottom end a bit by allowing more advance low down but it was a lovely car to drive, sounded great with the single big bore box and looked standard under the bonnet.

[jaydee]

vintage 998 A+ block flat top pistons
295 head skimmed to 10.2 CR ported and polished with 30mmx26mm valves


standard sitered rockers (to be changed for 1.3 rollers)
kent 276 camshaft

intensively modified Hs4 carb (to be swapped for an HS6) on a custom alloy inlet
twin box centre exit exhaust on a termotec wrapped LCB (on its last legs, to be swapped soon probably for a cooper freeflow)
lightened balanced flywheel
balanced crank
123 electronic ingition
plus a lot of other bits and bobs

Fuelling set up done with a lambda sensor before any event
dizzy curve selected before any event
cam timing checked before any event

I dont have power/torque figures as i havent rolling roaded it

[craigr91]

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.

This seems the most simple as I haven't a clue lol just like to read and learn, am reading a vizard book (how to modify your mini) taken from a library in 1990 ( before I were born lol) what's the cost for the stuff to do this?

[minimk1]

Want to try and get this thread going as it is so useful


It's my 1968 998 cooper engine

Spec should be near this :

Cooper s forged rockers
12a185 head ported polished and with big valves and double valve springs
Std d top pistons
Mg metro camshaft
Isky cam followers
Duplex lightened timing gear
3.5kg lightened flywheel
Wedged and balanced crank
Lightened and balanced con rods
Centre main strap
Centre oil pick up
Uprated diff pin
Grey clutch
'S' type uprated big ends
Twin 1 1/4 carbs with trumpets

Hope for 60-70 bhp would be happy if it was between 60 and 70

[minimender]

Latest......

 

MG head

MG cam

998 Mini City E Distributor (8 deg) modified

HS inch and a half carb 

Howley Inlet

1.3 Metro air filter

Electric fan

1.3 Metro cast exhaust manifold

Modified 1.3 Metro exhaust with single back box

Lightened Flywheel

Metro gearbox

3.76 Diff

 

Sort of budget,  insurance friendly,  fast road

Edited by minimender, 03 February 2014 - 08:23 PM.

[coopdog]

Latest......
 
MG head
MG cam
998 Mini City E Distributor (8 deg) modified
HS inch and a half carb 
Howley Inlet
1.3 Metro air filter
Electric fan
1.3 Metro cast exhaust manifold
Modified 1.3 Metro exhaust with single back box
Lightened Flywheel
Metro gearbox
3.76 Diff
 
Sort of budget,  insurance friendly,  fast road

What bhp?