11 replies to this topic

[Bam]

I want to tune my 998 and i was wondering what a realistic BHP aim is this is what im am going to do:

12g940 head
flat top pistons
strengthened con rods
port and polish cylinder head
balanced crank shaft
double valve springs
1:3:1 roller rockers
lightened fly wheel
peformance diff pin
straght cut gears
cebtral oil pick up
sports coil
weber 45 dcoe
all new bearings
polished valves
4 balde fan

[Sam]

Weber 45 on a 998??

Also no mention of cam, are you using a standard cam? Do you really need "strenghened" con rods on a lightly tuned 998?

I would say about 50bhp..

[Bam]

i for got about the cam, i want a road/rally cam form mini sport and a cooper S clutch plate.

you can get the weber jetted for a 998, do you thnk that twin 11/4" SU's would be better, in the mini peformance manuel it says that you can put a weber 45 on a 998.

[Bacon]

I'm building a fast road 998 at the moment.

12g940 MG head
Bocket the block
Kent 266 cam
SU HIF 44.
Stage 1 kit.

I've just read the "All in the head" question in this months workshop Q+A in miniworld.They think that if this sort of set up, is set up well,it should be between 65-70bhp.I was amazed with that.

[miniboo]

at least 70 bhp i reckon mainly because of using the 1275 head. will make a massive difference.

[Bam]

The reason that i am doing all of this to a 998 i because i have a spare 998 engine, what sort of diffrence will doing all of this to a 1275, and what will the 0-60 speed be?

[Bam]

And duplex timing gears NGK plugs.

[Pooky]

my mini was standard with a maniflow stage 1, got 45bhp at the fly (55 at wheels) after a rolling road session

something to compare it with

[Bungle]

my mini was standard with a maniflow stage 1, got 45bhp at the fly (55 at wheels) after a rolling road session

pooky i want you gear box

most boxes lose power yours makes it

[Pooky]

secret ingredient

[Jammy]

my mini was standard with a maniflow stage 1, got 45bhp at the fly (55 at wheels) after a rolling road session

pooky i want you gear box

most boxes lose power yours makes it

Bungle, I swap you one just like his for your JK 5 speed!

[Purple Tom]

Rob3 has a tuned 998:

+0.40 to 1040cc
modified 12G295 head
twin 1.25" SU's
Morspeed phase 2 cam
10.5:1 CR
roughly 3.6:1 FD
Freeflow manifold with 1.75" system
Fully set-up by AC Dodd
other stuff I can't remember

63 bhp and very flat torque curve - lovely engine to drive.