Cruising without cruise control!!

Disco Inferno · Aug 16, 2006

Hi

Have a V8 manual disco on twin su carbs. The carbs have just been re sealed and had new diaphrams. I now have a landy that goes realy well untill it is up to normal operating temperature where upon the reves drop normaly untill about 1800 - 2000 rpm and then very gradualy drop. If in gear it just keeps pulling and eventualy slows over about 15 seconds. The pistions in the carbs are returning to normal idel position correctly but the reves remain high for a while and then gradualy drop. The car works perfectly when cooler and then messes about when hot. It has been settup cold, hot, warm, with breathers, without breathers, both carbs are balanced.... You get the idea... I dont know what else to try other than throw the carbs away and try some different ones which would kind of defeat the object of having rebuilt carbs. Please help!!!!!!!!!

slob · Aug 16, 2006

did you put the correct amount and waight of oil in the dampers?

Disco Inferno · Aug 16, 2006

Excuse me for being dumb but... What?

GRUNT · Aug 16, 2006

Eeeeeeeeee they called em dashpots when I wuz a lad.

slob · Aug 17, 2006

Disco Inferno said:
Excuse me for being dumb but... What?

on the top of yer carbatooters there is a black cap. unscrew it and squirt a small amount of oil in it. if i remember correctly you fill it to the bottom of the threads. if the oil is too light it will reduce the damping effect and yer piston will fly up when its not susposed to. if its too heavy it will remain down or rise too slow.
too quick and yule get a rich mixture too slow and it will be weak.
i just used to bung engine oil in them but i can't remember which was the best weight.

Disco Inferno · Aug 17, 2006

Yep. I filled the dash pots just below the threads with 10-30w engine oil when they were rebuilt. Boo hoooooo...

My poor land rover's poorly. Any other ideas???? Keep em comin cos I have run out of things to try.

slob · Aug 18, 2006

you get the right needles in them?

slob · Aug 18, 2006

and jets?

slob · Aug 18, 2006

it does sound like it running rich when hot...is the choke set correctly

eightinavee · Aug 18, 2006

If it has those horrible little spring loaded tits in the throttle butterflys you need to solder them up.

clutchdust · Aug 18, 2006

junk the SU's and fit a weber 4 barrel, better mpg and performance

Disco Inferno · Aug 18, 2006

The needles and jets are the origional ones. Its just been resealed and had new diaphrams. Has been set up and tuned by a landrover specialist who has no idea what to do with it next.

1) Whats a springy tit?
2) How do I know if I have saggy tit?
3) Shouldn't springy tits be able to move and not be soldered up?

Nothing worse than a saggy tit

slob · Aug 18, 2006

are we talking su's or strombergs here??

Disco Inferno · Aug 18, 2006

1 3/4 Twin Su's

slob · Aug 18, 2006

i must be missing something in the memory dept. the su's i remember had a piston and no diaphram whereas stromberg had a diaphram and no piston

Disco Inferno · Aug 18, 2006

The landy garage rebuilt them for me and said diaphram and seals?? What happened was I'd fill the dash pots with oil and every thing would be fine and the next day I'd floor the accelerator the pistons would fly open and it would slowly pick up speed cos all the oil had leaked out of the pots. It wasn't visibly leaking though. They did their bit re building them and thats when it started sticking and revs droping slowly but only when hot. Its fine the rest of the time when cool (((Just remembered!!! When the revs stick if you switch the engine off and then re start it without touching the choke or accelerator tick over returns to normal untill you blip the accelerator again. When its sticking or slowly droping you can see the pistons have droped to tick over position with the air box and aluminium pipes off????))). I think I might just go and have a little cry now cos i've had enough of driving around in my estate and want my toy back! Any one got any carbs that are surplus to requirement gathering dust on a shelf some where?

slob · Aug 18, 2006

**** its years since i played with these things..but you have to ensure the needle is centered and the the enrichment jet is at the correct height

mondo · Aug 18, 2006

slob said:
**** its years since i played with these things..but you have to ensure the needle is centered and the the enrichment jet is at the correct height

That avitar yer new business image then slob?

Yellaslob Safari Adventures

Yep I can see it now....
Oh **** wots append to me typin

slob · Aug 19, 2006

duh!! its the french connection dummy!

OutbackJack · Aug 20, 2006

Aaah..SU carbs..twins no less.. had all sorts of bother with them on my old Rover SD1...and my Mini Cooper for that matter as well if I remember rightly...they are the only part of the car that is capable of more faults than there are parts for them.

Cruising without cruise control!!

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