17 replies to this topic

[booton]

ok in the middle of rebuilding my mini engine is a 998 A+ engine.

is a 998 block full reconned.

a 940 block with the larger valves 32mm
head has beeen ported and double valve springs.
a piper 270 cam supposed to add 10bhp.
if has a hif44 with K&N.
LCB and sports exhaust.
looking in to dizzys atm.

wha bhp u think

don;t even know wha standard bhp these 998 A+ engines are.

[booton]

any one know the standard hp of a 998 A+ engine

[secondopsman]

any one know the standard hp of a 998 A+ engine

Round about 38bhp.The wifes is a 998cc with a 12g295 head (lightly modded) and a stage 1 kit fitted witha Maniflow exhaust sytem.Running standard Metro electronic dizzy.When it was rolling roaded last Nov it had 55bhp at the wheels
HTH
Pete

[booton]

tha pretty good for at the wheels.

must have been nearly 70 at the engine.

tha impressive.
did u have a standard cam
and what carb
thanks steve

[blacktulip]

ditch the hif44 mate, too big for a 998. get a hif38 or hs4. i think 45bhp would be around the figure at the wheels with that spec so long as it is set up properly. why not get a stage 1 kit which has been propely developed such as the minispares kit? along with the rest of your mods.

also what kind of rpm are you hoping to run?

[danrock101]

any one know the standard hp of a 998 A+ engine

Round about 38bhp.The wifes is a 998cc with a 12g295 head (lightly modded) and a stage 1 kit fitted witha Maniflow exhaust sytem.Running standard Metro electronic dizzy.When it was rolling roaded last Nov it had 55bhp at the wheels
HTH
Pete

that's pretty good

[booton]

well with all the mods it pretty much the same as a stage 2 kit as its a 3-2-1 manifold. and a 1" 3/4 exuast.
the head i'm in the middle of porting and polishing.
copper head gaskest due to the head, has the larger valves.
k&n filter.

so a stage 1 kit would reduce performance. also the cam should produce more power than that i thought.

the cam has a power range from 1500 to 6500 will add 10bhp.

on the carb from i have a hs4 and a hiff 44 i would hav though the 44 be better.

[northy]

Read vizzard, the carb only supplies enough for the engine, under a certain potential power, a bigger carb will just lead to worse fuel economy with no increase in performance.
A HS4 only marginally chokes a 1275, so you'll be better off with that.

[booton]

fair enough. just though due to the higher rpm ranage would be better but will fit the hs4 going to be a *woman of ill repute* to idil any way with the cam

[booton]

any advances on 45 bhp as secondopsman got more bhp from less mods.

tha strange. thats all.

[Purple Tom]

Without meaning to sound harsh to secondopsman I'd be tempted to say that the rollers the car was on weren't reading correctly. 55bhp at the wheels is a massive increase for just a cylinder head and a stage one kit. When you factor in approximately 20% losses for the transmission it would indicate that the power output has been almost doubled. I'm willing to be proven wrong, but for a 12G295, stage 1, Maniflow exhaust and a dizzy with the incorrect advance curve that increase seems a little excessive.

Going by your spec booton I reckon if it was set-up really well you may be looking at 50-60bhp at the flywheel. I had a friend who built an all-singing all-dancing 1040 with full mappable ignition (MJ), twin 1.25 SU's, MSPD PH2 cam, modded 295 head etc, set-up over a few hours on ML Motorsports rolling road and it managed an estimated 63bhp at the fly, considerably less at the wheels. It was very torquey though with an almost flat torque plot on the graph.

I guess it depends how far you're willing to go to chase power figures. In terms of drivability and real world performance I personally would be looking at getting as much torque from the engine as possible.

Oh, and as advised, ditch the HIF44 and fit a decent HS4 or a HIF38 in good nick if you can find one. AAA needle is a good place to start and if you can justify it, go for MJ or another similar mappable ignition system, so much better if you're chasing power.

Hope that helps a bit

Tom

Edited by Purple Tom, 01 February 2010 - 07:54 PM.

[In-a-mini]

what compression ratio?. is it standard cc or bored out is the block deck'd?. also when you say larger valves 32mm what are the inlet sizes. go for a hiff38 with a 12g940 you can get away with a hiff44 but you lose some low down torque.

[secondopsman]

tha impressive.
did u have a standard cam
and what carb
thanks steve
[/quote]

Carb is hif38 and the bottom half engine was purchased from someone on here and is belived to have a kent266 cam and had some crank work done.I just put my head on it after inspecting the bores and its run like a dream since (approx 4500miles).As Purple Tom said though rolling roads are all different.I used http://www.mgcars.org.uk/peterburgess/ and must admit although he made a brilliant job the equipment did look a little dated.
Pete

[booton]

any u would recommend to create more toqure
thanks steve

[booton]

not worked the compression ratio yet as i haven't machined the block out to fit the head with larger valves.

the block is a standard size. with new rings and all other new parts etc.