Smoking exhaust after accelerating

[west E]

Hi all,

I have 2ltr Aircooled with dellorto drla 36 carbs. after my van has warmed up and i stick my foot down to say 3000rpm for a bit and then release it i get loads of smoke coming out of the exhaust. The smoke is a blueish colour. Can anyone let me know what it could be. I thought it might be oil or unburnt fuel but i ain't no mechanic.

thanks

ian

[AngeloEvs]

usually an indicator of worn valve guides, stem seals, or overfilling but there may be other causes that I am unaware of!

[Ian Hulley]

If this was a Cortina/$ierra/Granada you'd say 100% valve stem seals .... smoking on the over run, thus my money's on the valve guides I'm afraid.

Ian

[toomanytoys]

Check the easy things first...
What have you done with the crank case breathers??? if these have been blocked off you are generating a lot of pressure in the crank case... this pref needs feeding into the filters to generate a slightly negative pressure..

What oil are you using?? A good mineral 15w40/15w50 or even 20w50 is ideally whats needed...

No valve stem seals... so either guides are worn or the piston rings are...

[jason k]

i ran these carbs on my a/c wedge and fitted a catch tank for the breather as it has nowhere to go.

plus you should vent the rocker cover boxes as the big carbs can cause crankcase vent probs.

buy a cheapie empi kit but use proper hose.

makes a big difference.

you aint got my old bus have you!!!

[albertramsbottom]

Check the easy things first...
What have you done with the crank case breathers??? if these have been blocked off you are generating a lot of pressure in the crank case... this pref needs feeding into the filters to generate a slightly negative pressure..

What oil are you using?? A good mineral 15w40/15w50 or even 20w50 is ideally whats needed...

No valve stem seals... so either guides are worn or the piston rings are...

I thought it was straight 30 for Aircooled