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Home > Help Needed / General Tech Chat > Running Lean with Rich needle, air leaks?

pickmeup

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Bristol

16th Oct, 2010 at 07:02:57pm

Hey all, im trying to get robs british open running right, initially it was down on power and running really rich and coking up the plugs, i had the head skimmed and new head gasket fitted as it was down on compression on all bores,
While getting it mot'd the CO level was quite high so got it through by leaning it down a bit.

However it had a BEJ needle in the HIF44 which had been masacred with an angle grinder so i replaced it with a BDL to get the fueling somewhere better as its a std MG Metro 1275 with stage 1 but running megajolt and an mpi rad setup, the fueling has been set to 13.7 at idle on the afr gauge but anything over 1500rpm it starts going lean up to 17% and even off the scale!

Ive now replaced the BDL with a BBW to richen it further but im still getting the lean mixture, so i cant drive the car anywhere at the mo, any suggestions what to look for, ive checked for air leaks and nothing is noticeable? Im in the process of servicing a replacement carb and rob is hopefully going to plug the megajolt in? but am i missing something else?

Help greatly appreciated!!

Gaz


Mr Joshua

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Luton Bedfordshire

19th Oct, 2010 at 12:36:28pm

Dash pot oil?

Own the day


pickmeup

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Bristol

19th Oct, 2010 at 01:22:23pm

nope, but that was the problem on my mates mini on the weekend, done a compression test last night and its gone between 2 and 3 on the gasket again :( gonna have to get the mx5 out and motd this week to have a car otr

almichie

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Wiltshire

19th Oct, 2010 at 06:05:47pm

Are you sure it's the gasket gone? All the valves are good and sealing? Chuck some oil down the bore turn it over and do the comp test again

On 7th Nov, 2011 apbellamy said:
 Shaft seems nice and snug


On 24th Mar, 2012 apbellamy said:
no no no no, you need more boost! you can never ever come on here and say I have enough boost, that's just silly.


On 29th Mar, 2010 Star Mag said:
these give no problems with good head

theoneeyedlizard

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The Boom Boom speaker Police!

Essex

19th Oct, 2010 at 09:32:56pm

Is the block cracked / erroded between 2 & 3?

In the 13's at last!.. Just

BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

19th Oct, 2010 at 10:00:55pm

the cause will be pre ignition DETONATION what keeps taking the head gasket out here
cure is compression ratio for the fuel octain your running and or ignition timing too far advanced and a lean mixture,

but firstley check the head so its not warped UNLIKLEY ! and the block deck as again unlikley

use another torque wrench as yours may well be yealding before the the correct torque,

use 55 ft pounds on the head bolts only

hope this helps





Home > Help Needed / General Tech Chat > Running Lean with Rich needle, air leaks?
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