why turbo the 998cc
Turbo Mini Forums

What are peoples reasons for choosing the 998 over the std unit?

Is it just the "no one else has" reason, which is more than enough. Just wondering, bored at work like!

Alex

AlexF

The reason is quite simple.

The regulation for hillclimb/sprint modified production cars gives a 1.4 multiplier for turbocharged cars. Therefore, a 998cc turbocharged mini can run in the upto 1400cc ModProd class.

This is exactly what I do with mine. I reckon the potential for power vs cost/reliability is good. And the extra torque produced by the turbo really helps pull you up the hills.

And yes, it is a bit different.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

very cool... I hadn't thought about hill climb rules


alex

AlexF

998's have a much better rev potential than the 1275's (so im told)

My local mini shop, Mini Bitz in northampton (anti turbo bastards) Have a racing mini, recons they rev it to over 12,000 easily some times to 15,000

This is motorbike engine teritory, how can the little a-serise be able to cope with this>?

well i reckon they're full of sh1t

Either that or they have a very innacurate rev counter. Maybe one off a 3 cylinder motorbike?

I agree dave...

Its unlikly an mini engine will rev that high... not with std design crank, rods or availble pistons!

1275 milgia's seem to rev well enough to 9k... dont see many 998s doing that lol


alex

AlexF

How much does it cost to build / rebuild a 1275 ?
I can buy a long 998 for about $50 WITH ALL PARTS or a bare 1275 (Block, Crank, rods...) for about $400 .... hhhmmmm
that 277cc dont look so big now does it.... ?
I reckon my 998 is making similar power to some of your 1275 Turbos too ..... seems you UK guys max your boost at about 8Psi.. well so far Mine has taken 16Psi and it was only lightly detonating..... Oh and I dont have an Intercooler yet....

Stupidly reliable, crazy power cheap as chips to build......
Thats why it got my vote....

J

I'm not going to bite :p


alex

AlexF

so you guys actully turbo 998 a series!!!!
y is this, i suppose sum of the stuff said already makes sense but seriously is it a good idea??
998turbo wat exactly id the engine spec of your turbo id love to know how this is achieved and also jus how reliable they are!
cheers guys

go on alex you know you want to bite!! he's saying out 1.3s are not match for the 998

to be fair, turbo phil did manage 25psi...then melted

A-series power! 1972|1310|T3 turbo|Omega pistons|Cantre main strap|Orange clutch diaphragm|AP race plate|Comp pressure plate|Lightened steel flywheel|13-row oil cooler|Vernier duplex timing gear|Phase 2 Piper cam|Green air filter|Hi boost carb needle/spring|2"Stainless exhaust|3"Play mini stainless rear box|Jack Knight s/c 4spd gearbox|Jack Knight s/c drop gears|Silicon coolant hoses|Lumenition HT leads|GAZ lowered height shocks all round|Steel flip-front|Rear safety devices cage|Group 5 arches|6x12 deep dish Minilites|Surf blue/Old english white|

I wqonder if I can settle this, probably not.

I've got a 998cc turbo runing 20psi and 120bhp, which is pretty much 120bhp/litre.

Some of you guys here are running 1275cc and about 160bhp which is about 120bhp/litre, the same.

And, based on all things being equal, in theory a 1275 will make 30% more bhp than a 998. Which is roughly about right if you look at 120 vs 160. It would be foolish to think that an engine of the same design could make moor power with a smaller displacement, surely.

I'm sure we could all make more power if we wanted (or could afford it).

What bhp you got anyway 998Turbo?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

SOrry I didnt get back to you sooner, I've been wearing a towel.
(SImpsons reference...)

Spec ? - Very basic 998 Rebuild, but using locally (Australia) Sourced 998 Low-Compression pistons (High Silicon), Nitrided Crank, 1100 Cam and head (soon going to a custom grind cam and opening the chambers a little).

Exhaust manifold is a total custom jobbie, puts the Turbo over the clutch housing (no body cutting)

Intake is a basic bent pipe to a MG MEtro Plenum and Carb (BDD Needle)

Ignition is standard 998 Deluxy (Mechanical Dizzy) But i've altered the max advance plate to 8' instead of 10'

Possibly adding a water / air intercooler from a WRX in the next few weeks and upping the boost to a full time 16Psi (Curently 12Psi - but has to be dropped when ambient temp is more that 35')

The Turbo is an IHI RHB-4 unit that is a VI44 Trim ....

Cooling is by a Minispares 4-Core (slightly customised to fit a Mk1 body)

ANything else i've missed ?

Totally reliable, its just come up to 12 Months DAILY use and nearly 10,000 Miles including 3 Race meetings .....

Later
J

has anyone else had as much reliability with a 1275 block and T3? just curious, be driving mine for the first time this weekend.

A-series power! 1972|1310|T3 turbo|Omega pistons|Cantre main strap|Orange clutch diaphragm|AP race plate|Comp pressure plate|Lightened steel flywheel|13-row oil cooler|Vernier duplex timing gear|Phase 2 Piper cam|Green air filter|Hi boost carb needle/spring|2"Stainless exhaust|3"Play mini stainless rear box|Jack Knight s/c 4spd gearbox|Jack Knight s/c drop gears|Silicon coolant hoses|Lumenition HT leads|GAZ lowered height shocks all round|Steel flip-front|Rear safety devices cage|Group 5 arches|6x12 deep dish Minilites|Surf blue/Old english white|

Sorry to dig up old posts

Whats the story on these 5 years on then?
i was told by a very well expeirenced fella that turboing a 998 would proablly break valves etc often.
and would be just aswell sticking a 1 & 3/4" carb, manifold and lcb and racing cams into a 998 instead of turboing...


anyone able to weigh up the pros and cons?

"Holy thread excavation Bertman!"

If something is worth doing, it's worth doing half of.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

I set out to build my 998 Turbo because I wanted a moderate power level and the ability to deliver a reasonable mpg if used daily. Plus at moderate boost levels, you should be able to get away with nice quiet helical gears. I'm an old git, you see.

I actually prefer the 998 to the 1275 engines. The 998 does rev more freely, but lacks the torque of the 1275.

In my opinion, you do not need to go overboard on the 998 engine and box to get a reliable 120hp. Time will tell as I shall shortly be fitting the turbo.

It depends what you want, but if you want a simple solution to maximum horsepower, then use the 1275, but be preapred to spend more money on the clutch, drop gears, gearbox, diff etc.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Ok, on another note then...what engine would be best to use a metro or a mini engine? (apparently there is a diffence)

well,,, 998s are cheap as chips compared to 1275s so why the fark not

& here in the land down under the CAMS rules are that the cappcity is multiplied by 1.7 for "forced inducted" cars,,, so i`m now moving over to where you guys live if it`s only 1.4 times

& i was the first to,,,, nah,,,

www.miniman.com.au

"""LazyGoodForNothingSmartArseKnowItAllBackYardMiniMechanic"""

They are exactly the same engine, just differnt mounts and stuff. Mk2 Metro's had cable clutches, but thats sorted with a differnt clutch arm.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."