17 replies to this topic

[josh.evans]

i have been looking into a stage 3 head for my 998

what sort of power increase will i get also will it be noticeable?

are they easy to fit

and are they worth the money

hope you can help

cheers
josh

[IainR]

My understanding is that a stage 3 head would need a lot of other changes, i.e. manifold, carb, exhuast and cam to make a difference. A stage 3 head on its own would be useless, it would need the camshaft changed.

See the links to stages of tuning for A Series at the top left of the home page.

For an immediate increase in performance changing to a 1275 would probably be cheaper.

Edited by IainR, 11 February 2010 - 12:07 PM.

[PhilRobbo]

My understanding is that a stage 3 head would need a lot of other changes, i.e. manifold, carb, exhuast and cam to make a difference. A stage 3 head on its own would be useless, it would need the camshaft changed.

See the links to stages of tuning for A Series at the top left of the home page.

For an immediate increase in performance changing to a 1275 would probably be cheaper.

Would it definately need a cam change? i have been running a stage 3 head on my mini, with exhaust system, mg carb and 1.5 rockers and a standard cam with no problems.
having a look at the likes of a minisport stage 3 kit for a 998, they provide everything you suggest in their kit, apart from the cam. just saves the whole engine out jobby?
ps. i am still learning myself, not arguing, so just tryin to understand.

Edited by PhilRobbo, 11 February 2010 - 12:20 PM.

[Pauly]

You dont need a cam change to get good figures out of a modified head, although it helps. The cylinder head is the most limiting factor of an a series, get this flowing well and the rest can follow on.

[Cater_Racer]

Hi Josh,

I run a 998cc stage III, I know lots of folk say always go straight to 1275, but I can (sometimes) run in a 1000cc class and then I'm extreemly compeditive.

I have the 276 cam LCB, with gas flowed inlet but only HS2's.

I'm getting about 70BHP and it's quite quick enough to give the 1275's a run for their money.

Cater_racer

[liirge]

Hi Josh,

I run a 998cc stage III, I know lots of folk say always go straight to 1275, but I can (sometimes) run in a 1000cc class and then I'm extreemly compeditive.

I have the 276 cam LCB, with gas flowed inlet but only HS2's.

I'm getting about 70BHP and it's quite quick enough to give the 1275's a run for their money.

Cater_racer

70Hp....Really?
i think you might of been on some fairly optimistic rollers!

[bmcecosse]

A 'stage 3' head could mean anything! And is likely to be very expensive!! Better to go with a simple 12G295 head and skim it 80 thou, or even better - a 12G940 head - no skimming required, just sink the exhaust valves by 40 thou. The 998 cam can be easily changed without taking the engine out! It's well worth doing if you want decent power.

[crossy71]

not to hijack the thread because it is relevant, my 998 has the stage 1 kit, a 266 cam and a standard unleaded head a fairly common setup i believe.
I didnt feel a great power increase with the cam and im guessing the standard head was the limiting factor.
Id rather get a stage 3 head as i love showing up chavs in there corsa's and fiesta's with a 1 litre . With this sort of setup what sort of Hp boost would the aformentioned stage 3 head make?

Also Josh i belive that fitting 1.5 rockers would be the best route of gaining power if you do not wish to change the cam

[liirge]

the 266 is a very mild cam, thats why you didn't really feel much of a power boost.

[bigminiandy]

mt mini runs a 998 stage 3 and 266cam with standard rockers and standard ignition system.

The rolling road reckons it makes 55 horse power, which is exactly what the guy tuning said he expected it to achieve.

[valve bounce]

get yourself a 12g295 head off ebay or somot get it skimed cost will be half the amout that an off the shelf stage 3 hed will cost from any of the major supplyers.

on another note i fitted 1 of these heads on my 998 with a 997 cooper cam, hif 38, stage 1 kit, all this gave 44bhp @ the wheels so about 55-60 at the flywheel even tho at the time i had ruined piston rings so the compression was down from 180psi to only 130psi

whatever you decide to do good luck

[bmcecosse]

This one looks good - and there are some others on ebay at present. http://cgi.ebay.co.u...=item27af3c0a61

But note he is (v wisely) changing it to fit a 940 head!

Edited by bmcecosse, 11 February 2010 - 09:24 PM.

[Cater_Racer]

by the way Josh, you need to be careful, when I bought my stage III, I had to have the block pocketed to stop the valves touching.

So that's engine out anyway......................................

And I needed cold plugs, without extended extrodes to avoid running on, but both of these maybe due to the head, and as has been said, there's no real standard Stage III.

Minisport rolling road, did the final set-up, I was very pleased with their standard of customer service and skills.

[Mini_city10]

get yourself a 12g295 head off ebay or somot get it skimed cost will be half the amout that an off the shelf stage 3 hed will cost from any of the major supplyers.

on another note i fitted 1 of these heads on my 998 with a 997 cooper cam, hif 38, stage 1 kit, all this gave 44bhp @ the wheels so about 55-60 at the flywheel even tho at the time i had ruined piston rings so the compression was down from 180psi to only 130psi

whatever you decide to do good luck

my mini has a stage 1 kit on it got a dyno print out with 47 bhp at the wheels!!

56 at the flywheel

[valve bounce]

thats good going, mine would of been alot better but as i say the piston rings were shot so it was using LOADS of oil and had no compression. the guy that dyno'ed it said it would of made atleast 50@ the wheels if the compression had be back were it should of been