14 replies to this topic

[mini.rich]

Hi, I'm in the idea's phase for an engine build and I'm after some advice

As the title, I'm looking at possibly building a supercharged 998, it's going to be used everyday so I'm not looking for out and out power, just want something a little nippy that will compensate for the 2.7FD I'll be using as it will be used for doing a fair amount of travelling. It'll be a Blow Through system (SRE) and I'm looking at using Specialist Components 5 port engine management/injection setup eventually.

I've got a standard 998 engine (A-series) with 24,000 on the clock so I'll be using that. For the head and cam I was thinking about using MG Metro items(which I've got kicking about), would these be ok? if not what cam would be best suited? I also have an MPi cam if thats any good? will the standard pistons be ok for the output?

Also while I'm thinking about it, what exhaust manifold would be best a Cooper freeflow or LCB?

What I'm going to do is build the engine and use it without the supercharger and ignition setup to start with, so I need to do the cam before it is installed.

Any other advice would be helpful.

Thanks Richard

[james962]

How would a swiftune SW5 in a 998 fair with forced induction?

[haimesyboi]

If you have a N/A mg metro cam this would be a good one to fit.

Standard pistons in good condition are fine, find out your compression ratio and determine if you need to make any changes for the boost level you intend to run at.

If you have a standard diff it would be worth upgrading to a x-pin one.

[Gr4h4m]

the SRE kit mybe different to the suck through. A 266 runs well with a 998 suck through. Turbo Phil sorted my head (a 295) with some porting etc and it makes good power. Supercharged suck throughs seems to be more at home with a more agressive cam, suck through might be a different ball game... I would run the LCB.

[mini.rich]

Yep, definitely going to run a x-pin diff with the 2.7 FD, they eat standard diffs, god knows what it would do with a supercharger on it! Lol

I've decided I'm going to go +.20 now, instead of staying standard, so I will be starting with a fresh engine.

Which would be the better cam, the mg metro or a 266, because that was what I was considering.

Thanks

[BoboGib]

I'm just about to start my build, which is spookily similar. i've gone for

MG Metro Cam,
12G295 head (standard)
Cooper free flow.

[mattsmadmini]

pistons: I would be more inclined to OB the block and fit the next size up, being a daily i would go forged pistons, though as others have said, modern cast may suffice. bugger going 20' thou, go the whole hog, get some 80' thou will help with decompressing the engine

Cam: with a 2.7 you will want something torquey im a customer of Graham Russell in Sydney here, he would tell you (as he told me) that his RE83T will outperform any cam on the market at the moment... (i believe it too...) it is on 'cam' from 2000 up to 6500rpm peak power is 4k....

Head: a 12g295 or worked 12g202 would be fine, fit some larger intakes

LCB's as they are strong for mid range and sound amazing...

i think thats about it...

-Matty

[Turbo Phil]

bugger going 20' thou, go the whole hog, get some 80' thou will help with decompressing the engine

How will increasing the engines capacity decrease the compression ? Increasing the swept volume will raise the compression.

[Wil_h]

bugger going 20' thou, go the whole hog, get some 80' thou will help with decompressing the engine

How will increasing the engines capacity decrease the compression ? Increasing the swept volume will raise the compression.

Exactly Phil.

The problem with going +20 on a 998 is the availability of pistons. You'll need +40 minimum.

[mini.rich]

bugger going 20' thou, go the whole hog, get some 80' thou will help with decompressing the engine

How will increasing the engines capacity decrease the compression ? Increasing the swept volume will raise the compression.

Exactly Phil.

The problem with going +20 on a 998 is the availability of pistons. You'll need +40 minimum.

I have! just secured a 1030cc short engine.

So what cam would be best suited for this application?

[Gr4h4m]

depends if its blow or suck through.

suck - Seem to like a more aggressive cam like a 266 or 276 depending on how you drive and what you want. Vmax do some supercharger specifics cams. (264/274 if I remember correclty)

Blow - I would guess you would be better with a turbo style cam like the metro / KC 500 or the PH2. but you are best to chart to SRE as they seems to hae the most experiance as they have desighed the kit. Just depends how much work they have done with different cams esp with a small bore engine.

[mattsmadmini]

bugger going 20' thou, go the whole hog, get some 80' thou will help with decompressing the engine

How will increasing the engines capacity decrease the compression ? Increasing the swept volume will raise the compression.

Exactly Phil.

The problem with going +20 on a 998 is the availability of pistons. You'll need +40 minimum.

I have! just secured a 1030cc short engine.

So what cam would be best suited for this application?

Im biased... RE83T or for the higher revs RE13T (both made by GR over here in Oz!)

[twrminisport]

Mg metro cam or Kent 266

[NG007]

Re83t! 266 cam is boring and disappointing

[jpc]

What about these pistons if going +20
http://www.calverst....&products_id=80
As far as i know there the same as the old minispares ones.