486 replies to this topic

[PhilipGCaldwell]

Yes, max revs of 4000,
the air fuel ratio is all over the show, desprrately needs a custom needle
all in all, quite pleased

[PhilipGCaldwell]

Yes, max revs of 4000,
the air fuel ratio is all over the show, desprrately needs a custom needle
all in all, quite pleased

[mini_in_progress]

thats awsome mate, like said once its been setup propperly it shoyuld see 60bhp id of thought

[PhilipGCaldwell]

I'd hope near the 60 mark once its all tip top and can rev it to near 6k, the air/fuel ratio was waaaay way out on the gauge, running around 22/1, too lean

[MiniLandy]

I'd hope near the 60 mark once its all tip top and can rev it to near 6k, the air/fuel ratio was waaaay way out on the gauge, running around 22/1, too lean

That is really, really lean, should run a lot better with the timing and fuelling sorted.

[PhilipGCaldwell]

I know, weak as a kitten, will look at getting a different needle, anyone got any ideas? The mixture is 2.5% CO at idle at the mo

[oltonlad]

if its a HIF44 that you are using then i would start with a BBB needle, that should richen it up enough to finish runnning the engine in, running it too weak could cause piston damage.

[racingenglishcars]

I've been following this thread for a while and I've been inspired. It's really great to see what can be done with the small bore, on a budget too.

Running lean will definately eat your spark plugs.

Anyway,
WinSU is a very good program for figuring out needles. At 10 quid it's cheap. I got it because I'm putting 2 HS4s on a 1.3 Marina engine in my Frogeye.

Enough babbling. I ran these specs through WinSU:
998 std bore
single HIIF44
mesh filter on rampipe
minispares manifold
12G940 head ported
Kent 276 cam
1.3 rockers
LCB medium bore
mapped distributorless ign.

They may be wrong, but that's what I remember now without searching the last 15 pages.

I don't remember what needle you have, but WinSU comes up with best; BBZ, next up; AKN.

BBB, BBZ and AKN look spot on each other up through transition to midrange, BBB runs very slightly richer all through midrange then becomes too lean towards high end. BBZ goes a bit richer towards top end and AKN too rich towards top end.

The program also claims 60.7 HP flywheel and 47 HP at wheels.

[PhilipGCaldwell]

I've been following this thread for a while and I've been inspired. It's really great to see what can be done with the small bore, on a budget too.

Running lean will definately eat your spark plugs.

Anyway,
WinSU is a very good program for figuring out needles. At 10 quid it's cheap. I got it because I'm putting 2 HS4s on a 1.3 Marina engine in my Frogeye.

Enough babbling. I ran these specs through WinSU:
998 std bore
single HIIF44
mesh filter on rampipe
minispares manifold
12G940 head ported
Kent 276 cam
1.3 rockers
LCB medium bore
mapped distributorless ign.

They may be wrong, but that's what I remember now without searching the last 15 pages.

I don't remember what needle you have, but WinSU comes up with best; BBZ, next up; AKN.

BBB, BBZ and AKN look spot on each other up through transition to midrange, BBB runs very slightly richer all through midrange then becomes too lean towards high end. BBZ goes a bit richer towards top end and AKN too rich towards top end.

The program also claims 60.7 HP flywheel and 47 HP at wheels.

Thats good info buddy, thank you, looks like I will try the BBB needle first off see how she does, she really needs a RR desperately

[mk3 Cooper S]

if its a HIF44 that you are using then i would start with a BBB needle, that should richen it up enough to finish runnning the engine in, running it too weak could cause piston damage.

+1
No good to run in an engine that is tool lean.
When you say lean, what was the AFR ?

[PhilipGCaldwell]

22/1 , far too weak

[mk3 Cooper S]

Change the needle or richen it up ASAP !!

[oltonlad]

what needle is in it at the moment for the mixture to be that weak?

[Carlzilla]

60bhp isn't bad from a 998 to be perfectly fair. most stage one 998s sit around 50bhp, stage one 1275's sit around 65bhp.
I'd be happy with that!

[oltonlad]

60bhp isn't bad from a 998 to be perfectly fair. most stage one 998s sit around 50bhp, stage one 1275's sit around 65bhp.
I'd be happy with that!

arent standard 998's 38bhp standard?.......i didn't realise that a stage 1 kit would provide another 12 bhp, most companies claim an average increase of 20% which would equal about 45 bhp.

Edited by oltonlad, 27 February 2012 - 09:12 PM.