started running lean
Turbo Mini Forums

I changed the engine in the mini for the metro engine the other day and have taken the car for a drive today and found that it feels to be running lean with a lot more induction noise then before.

It is running the carb that was running fine on the previous engine, and nothing else apart from the engine has been changed. What possible reasons could it be running lean for?

Thanks.

are the engines the carb was on both identical specs?

as iain said
also check all the pipes to and from the carb for air leaks

and the exhaust as well, on a NA would make a fair bit of difference

did you lift the engine using the manifolds? might have moved and created an air leak?

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

It could be the exhaust. I will check.

The only difference is that the previous engine I think was the either 8:1 comp ratio or 8.8:1 and the new one is 9.4:1

a new manifold gasket was put on.

well there's your difference!

get it set up properly and it will be loads better

changes like that need more fuel!

Thanks. I will get it as near on as I can through how it drives. It is only the tempory motor until I build a pokey one.

well you could try a bit of diy, throw a richer needle in, or one suited to the engine you have now. its not "as critical" on a NA.
you can get one something like to get it to run nicely, to get the best mpg and performance though it needs a good tune up.

Erm! I found why it was running lean. It helps if the dashpot is filled full with oil:$:$:$:$:$

there you go