smooth runnings

[dorisandjack]

evenin' all, not long fitted my hs4 carb and after a bit of mucking about with needles finally got the running about as bang on as it'll go without a colour tune, general driving is absolutely fine although the only issue seems to be (which is driving me round the bend) is that when idling and i depress the clutch and put it into first there is a fair amount of vibration and the revs drop steadily but considerably enough that the engine is nearly cutting out (sometimes will) along with this there seems to be a slight whir from the clutch itself, i would higher the tick over to counteract the problem but then it would be too high with the clutch depressed, as a result of this i normally have to blip the throttle slightly to pull off, could this be an ignition advance/retard issue? i was hoping someone might be able to shed some light on the brain frying conundrum!

[panky]

Maybe running a little lean, have you tried the lift pin test?
Which needle did you settle on by the way.

[kennatt]

only since new carb,ok before that

[bmcecosse]

Seems to me the clutch is being over travelled. Is there an inch of free play ? Don't waste money on colour tune - just use the pin as already suggested. And try a heavy oil in the dashpot. And indeed you should adjust the timing to get the smoothest idle. What manifold did you use with the larger carb?

[dorisandjack]

i tried M1 and BQ needles after reading the vizzard book but these were farrrr too rich, i finally settled for the AAU, i've just replaced the relay shaft bushes and spring both gearbox and chassis side although there's a lot of play in the linkages so I'm not getting much free play so i'll be replacing them too next pay check, should all be done at once i know but money runs thin on running projects! so maybe the clutch is disengaging too far??

[bmcecosse]

It is - slacken off till you have an inch free play.

[Declan_Burns]

The linkages that are being sold are rubbish. I had to re-bush them and still was not happy so I made my own adjustable link.
If anybody needs such linkages contact me.
I have being making stainless steel linkages and pedal box gaiter kits for MG's for some time using rose joints to eliminate play-see second photo.

[frame][/frame]

MG clutch linkages
Regards
Declan[frame][/frame]

[123]

evenin' all, not long fitted my hs4 carb and after a bit of mucking about with needles finally got the running about as bang on as it'll go without a colour tune, general driving is absolutely fine although the only issue seems to be (which is driving me round the bend) is that when idling and i depress the clutch and put it into first there is a fair amount of vibration and the revs drop steadily but considerably enough that the engine is nearly cutting out (sometimes will) along with this there seems to be a slight whir from the clutch itself, i would higher the tick over to counteract the problem but then it would be too high with the clutch depressed, as a result of this i normally have to blip the throttle slightly to pull off, could this be an ignition advance/retard issue? i was hoping someone might be able to shed some light on the brain frying conundrum!

Have you heard of "Plug chops" and / or "Cam dwell Meters"?
.

[bmcecosse]

[123]

. . . .

[Declan_Burns]

Here's a photo of the modified clutch linkage installed (without the dust boots).
Regards
Declan[frame][/frame]

[bmcecosse]

I'm surprised you haven't rose jointed the long link too Declan !

[Declan_Burns]

It's on the cards.
Regards
Declan

[Declan_Burns]

Here's a more detailed photo of the linkage. This is bolted up tightly between the relay shaft and the pedal and removes all play at this part of the clutch linkage. It replaces the metal plates and is adjustable by a few mm although that was not the object of the exercise. The chamfered brass spacer is a seat for the dust boot and prevents the boot being squashed when tightening the bolts.
Now on to the long link. I think this is a 5/16 UNF thread-can anybody confirm?

Regards
Declan[frame][/frame]

[IslipMinor]

Hi Declan,

Definitely 5/16" UNF - please see the 'sticky' at the beginning of the 'Mechanical' section.

[Declan_Burns]

Thanks Richard.
Regards
Declan

[danielvoorwerk]

Nice new (for me too) project Declan !

Will do when swapping the gearbox soon (First finish my demper-overhaul, all parts sourced ;-)

[Declan_Burns]

Here's the long link to match.
Regards
Declan[frame][/frame]

[bmcecosse]

Looks to be 'the business' - are you planning on selling it as a kit Declan?

[Declan_Burns]

I might give it some thought with the dust boots as an option. The dust boots are the most expensive part at £3.43 each.
Regards
Declan