Sooty back?

[tsunamivw]

Hi All

Just back from a nice jaunt and the back of my westy is again covered in black marks, I'm running a 1600 with twin carbs and it backfires when you take your foot off, we've heckled the timing and tapped the tappets, is the mix too rich?

Ideas welcome

Cheers

 

[A5H]

Check for air leaks on the carb(s) and particularly on the exhaust.

 

[tsunamivw]

Cool, how do I check for leaks, just run the engine and try to feel the leak?

 

[weeboll]

stick your foot over the exhaust to check for leaks at that end

 

[aogrady]

Hi!

If one of the pre heat pipes has rusted through, this will make it backfire, mine did this. The pipes are the thinner ones on the inlet manifold that go to the top of the exhaust, on a stock set up anyway.

Or a oil leak will splat the back, pushrod tubes, rocker covers or crank seal which will leak between the engine and gearbox join, oil will splash up the back like this too.

As already mentioned, a air leak somewhere, inlet or exhaust (pre heat pipes)

HTH

Cheers,

Alistair

 

[tsunamivw]

I covered the exhaust while it was running as suggested and it didn't seem to change the engine note, is that an air leak? If it is apart from the manifold where should I be looking? Its a 1.6 twin carb with a stainless from Bluebird

Cheers