The Triumph Dolomite Club - Discussion Forum

I am trying to get my 1850 into some sort of correctly tuned state. It is a completely standard car.
When I time thre ignition with a strobe, I set the revs at 1000 rpm and set timing at 11 degrees.

This is the problem, at about 11 degrees the engine is spluttering and about to stall, at about 25 - 30 degrees (way off the marks) the engine is racing up to about 2000 rpm and is running smoother.

What am I doing wrong? or is that normal behaviour ie when the timming is correct it runs like a pig.

Hi, Have you removed the dizzy at any stage, if so, maybe its been refitted 180 degrees out?

I don't have the manual to hand, I know its 11 degrees for a sprint but not sure about an 1850.

the dizzy is 180 out it wont run at all....

I strongly suspect that you have a manifold air leak. Check your carb breather hoses and then flexible mounts. Use some sort of carb spray and if it picks up when you spray the joints its leaking. New carb gaskets and /or pipes should cure it.

It should run smoothly at 850 rpm at 11 btdc. If it doesnt something is wrong.....probably carb related. You could check the bob weights in the dizzy to see if a spring has broken...but in all my years of 1850 ownership its always the carbs if it starts at all...

Jonners

Jonners to the rescue....again!

According to the factory workshop manaul the timing should be 11 deg BTDC at 750 rpm so I second what Jonners says. It will also be running lean at the correct timing if there is indeed an air leak hence the spluttering.

Sure jonners is spot on. Just another one that has thrown me before: Check the vac advance unit on dizzy. Just suck on the pipe ans watch the baseplate more or not!

Carb mounts are perished and cracked, if I lift the whole twin-carb assy. the engine speed increases. The linkage moves a bit but not enough to open the throttle as far as I can tell.

I think I'll have a go at knocking up some home made solid mounts. When I put the air filter box back on after syncing the carbs, they sat differently and caused the butterflies to no longer open at the same time.

Does anyone have any tips, I did see on another thread mention of people that had made their own solid mounts but not much detail. I am thinking of tearing the current mounts apart, finding some steel tube with as near to 1 1/2inch internal dia. and welding 'em together. A bit "agricultural" in terms of technology, fit and finish I know, but what else is there other than £40 for new ones that last about 2 years?

Yep, club solid mounts. 65.99 inc vat and delivery. Fit once and forget forever.

Tinweevil

Do the club solid carb mounts fit the 1850 too? I thought they only fitted the Sprint.

D'oh! ignore me.

Can get them from Chris Witor for the 1850. Bout 100 quid a pair