67 replies to this topic

[Gremlin]

Just wondering if anyone could be give me an estimate on what you think my spec would produce?

998 +.80
Pocketed
12g940 head (standard)
266 kent cam
Steel/alloy vernier timing
Mini spares lightened flywheel
Flat top pistons
10.4 CR
Lightened dizzy drive
Polished con rods
Maniflow single box system
HS4 and alloy manifold

60+

Iwould say 65 if not 70

[cradley-heathen]

 

my dad has a cracking 998 in his '73 which my brother put together for him,
 
its much like some of the others really,
 
pocketed block,
12g940 head that was ported and had the chambers tidied up
kent 266
hif38 with a k&n
cooper freeflow, twin box rc40
 
and that is about it, made 80bhp and 70lb/ft torque on hi-tech rolling road a couple of years ago, the same day i took a customers 1275 which made 63bhp!
 
it drives great and really does rev very easily, i would like something similar in my metro when i get round to it.

80HP! Really?

 

there is no guarantee that the rollers arnt out of calibration or anything like that, but i assure you im not making it up, thats what the sheet says, we have the print out to prove it, mick at hi-tech was over the moon with it! as was my dad!

[Gremlin]

 

my dad has a cracking 998 in his '73 which my brother put together for him,
 
its much like some of the others really,
 
pocketed block,
12g940 head that was ported and had the chambers tidied up
kent 266
hif38 with a k&n
cooper freeflow, twin box rc40
 
and that is about it, made 80bhp and 70lb/ft torque on hi-tech rolling road a couple of years ago, the same day i took a customers 1275 which made 63bhp!
 
it drives great and really does rev very easily, i would like something similar in my metro when i get round to it.

80HP! Really?
 

there is no guarantee that the rollers arnt out of calibration or anything like that, but i assure you im not making it up, thats what the sheet says, we have the print out to prove it, mick at hi-tech was over the moon with it! as was my dad!

Fair enough, just doesn't look like the sort of setup that would push out 80BHP

[Cooperman]

That does sound a bit high for the specification.

One might have expected around 60 to 65 bhp. Remember, the original 998 Cooper only had 55 bhp and 80 bhp is over 40% up on that.

I built a Cooper with a very full-on 998 engine which had a 286 cam, big-valve 12G295 head, modified twin HS2 carbs, 10.5:1 CR, everything matched, Aldon Red dizzy, etc, and it gave 73 bhp at 6600 rpm on the Autotechnique rollers in Luton. Nothing below about 3500 rpm, but revved to well over 7000 rpm. This was a tarmac historic rally car.

When we fitted a 970 'S' engine with twin HS4 carbs, 12G940 race head, etc, etc, it gave 84 bhp at 7200 rpm but nothing useable below 4000 rpm.

I got a 1060 cc Cooper engine to give 66 bhp at 6000 rpm with a 295 head, 510 cam, 10.4:1 CR, Aldon Red dizzy, HS4 carb (modified on Howley flowed manifold), freeflow manifold & RC40 box, all lightened, balanced, and carefully built. 

[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

How was the 998 on the road with the RE13OT?? Leaning towards it in my fast road 998!

 

Very fun and very torque, vid whit ultralight flywheel and megajolt but need tune.

 

 

Still running nowadays but whit close ratio gearbox, 3.65diff and a twin box side exit maniflow.... even more fun...!!!

 

After last rebuilt, whit std 12g940.

 

Edited by Pyntas, 18 March 2014 - 10:38 PM.

[Stiggytoo]

998 +20 pocketed (1014cc)

10.2 CR
County flat top pistons
Early mg metro cam
Standard 12G940 head - thought better of the big valve one..
Duplex
hif 38 - AAU slightly richened at top
RC40 twin box

3-1 Manifold

 

54bhp and 60ftlb torque. Not too bad as I haven't gone all out with it. Very driveable now.

Edited by Stiggytoo, 07 May 2014 - 09:38 PM.

[Dr s]

1050cc, cooper 997 cam. Twin hs2, pocketed block big valve 12g295 maybe 1275 gt size valves can't remember! Super light fly and strapped crank. Free flow and rc40 single box. 3.76 diff. 10.2:1 cr on hepolite pistons.
72bhp and all period mods

[minimk1]

Std 998
Mg metro cam
Lightened cam followers
Lightened duplex chain
12g295 head
Double valve springs
Maniflow manifold
Works cooper s exhaust
Oil cooler
Stage 1 inlet
Aau needle
K and n filter

Hasn't been to the rolling road yet

Edited by minimk1, 07 May 2014 - 09:02 PM.

[coopdog]

a 998cc +60 so its a 1046cc
a stage 3 12G295 head
28/36 Weber
Maniflow manifold
Rc40 twin box
MG Metro cam
Centre oil pick up
Duplex timing chain
 

64BHP 64Torquessss


New build

a 998cc +60 so its a 1046cc
a stage 3 12G295 head
28/36 Weber
Maniflow manifold
Rc40 twin box
MG Metro cam
Centre oil pick up
Duplex timing chain
T2 turbo

120BHP

[Dextercooper]

I'm building

 

998cc Standart Block

Flat top pistons

12g295 (not sure if standart or staged)

Twin HS2 Rebuilt

SW5-07 Camshaft kit

LCB Exhaust Manifold

Have to see CR

Duplex timing chain

 

Hopping 60 at the wheels

[minimk1]

Std 998
Mg metro cam
Lightened cam followers
Lightened duplex chain
12g295 head
Double valve springs
Maniflow manifold
Works cooper s exhaust
Oil cooler
Stage 1 inlet
Aau needle
K and n filter

Made 57bhp

[John Gervais]

Fun thread...

 

998 A-series

Keith Calver stage 3 head

9.5:1 CR

997 cooper cam

1:3 roller tip rockers

HIF38 & modified needle

K&N filter in modified plastic airbox with modified (flow-optimized) alloy carb elbow

Minispares alloy intake manifold

Maniflow Freeflow exhaust manifold and Maniflow 1.75" Twin Box (Large Rear Box made w/1.75" internals) Center Exit Exhaust System

Lightened Duplex timing chain

Minispares lightened steel flywheel & backplate

H&H Ignition Services rebuilt/recurved 45D distributor

Luminition Optronic ignition

3.44 FD

4-blade fan & electric fan supplement when required

 

Don't really know what it produces, but it's a lot of fun and pretty quick.

Edited by John Gervais, 05 February 2016 - 02:55 AM.

[Hollywood Vampire]

998cc STD pocketed block

D-crown pistons

10.5:1 CR

Lightened rods (balanced with the pistons)

649 camshaft

Adjustable Duplex timing gear set

Lightened STD flywheel & 22G270 backplate

Orange clutch

12G940 head STD valves

1275 pressed steel rockers

Lucas Distributor 25D No 40955 (Cooper 998)

Powerspark electronic ignition

Weber 40 DCOE

5" Inlet manifold

Exhaust manifold "pressed steel" (the old 3 into 1)

Cherry Bomb exhaust silencer

1300 GT C/R gearbox

S/C drop gears

3.65:1 Final drive 

Upgrade diff pin

Central oil pickup

 

About how many HP, I don't know! My engine is more like a upgrade of the 55HP 998 Cooper engine, so 65HP maybe? 

Edited by Hollywood Vampire, 04 November 2015 - 09:31 PM.

[gazza01]

I don't wish to be rude but the amount of money some of you guys are spending to get a 998 up to 80 bhp you may as well stick a 1275 in and be done with it. The many hundreds of pounds saved will cover any extra insurance cost if that's an issue. 

Sure if it's a car that needs to keep it's originality, but otherwise??

Like I say, I don't want to dig you guys out, I just don't get it.

Good luck though.

[coopdog]

I don't wish to be rude but the amount of money some of you guys are spending to get a 998 up to 80 bhp you may as well stick a 1275 in and be done with it. The many hundreds of pounds saved will cover any extra insurance cost if that's an issue. 
Sure if it's a car that needs to keep it's originality, but otherwise??
Like I say, I don't want to dig you guys out, I just don't get it.
Good luck though.

Because it's fun......