Increased fuel, less compression?

[Fredrikkk]

I turned my fuel screw in about half a turn in and backed off the smoke screw to get a good balance between smoke on and off boost. I have the turbo dialed in to 1.1-ish bar and there is no smoke on boost. I was able to adjust the idle down to 950 afterwards. However, now that I'm driving it, it seems like it's either lost compression or there is some residual fuel that runs into the cylinders after I let off the throttle.

Engine braking isn't as effective as before..

I didn't blow my HG or piston rings did I?

[Smokey Eddy]

Is the only symptom that engine breaking doesn't seem as effective?
does it still start fine?

[Fredrikkk]

It still starts fine, drives like never before, leaves a little bit of black smoke and then it clears up.

[nathan_b]

fuel screw in too far?

[Fredrikkk]

I haven't gotten the metal jacket off, so I doubt it...  I can still adjust the idle with the long idle screw on the back of the pump. It barely smokes too.

[nathan_b]

I haven't gotten the metal jacket off, so I doubt it...  I can still adjust the idle with the long idle screw on the back of the pump. It barely smokes too.

wrong throttle spline does strange things

[Fredrikkk]

But I haven't touched the throttle lever either..  I mean it doesn't really bother me, but I was just wondering if anyone had an answer!

[R.O.R-2.0]

if you turn the fuel screw in too far, you dont get the same quantity of engine braking, try turning it back out about 1/8 or 1/4 turn..

you didnt lose compression, the governor is just hanging ever so slightly.

[Fredrikkk]

The man who has an answer for everything.

Thanks! I will do that

[nathan_b]

The man who has an answer for everything.

Thanks! I will do that

I told you way at the top that you had the fuel screw in too far, do I not have enough posts to be taken seriously yet or something? dang,

[R.O.R-2.0]

The man who has an answer for everything.

Thanks! I will do that

I told you way at the top that you had the fuel screw in too far, do I not have enough posts to be taken seriously yet or something? dang,

you guessed tho, i gave him a definitive answer, and a reason why.. thats why i got the praise. good job for being on the right track tho!!

[Fredrikkk]

The man who has an answer for everything.

Thanks! I will do that

I told you way at the top that you had the fuel screw in too far, do I not have enough posts to be taken seriously yet or something? dang,

I need a definite answer you see. And I do tend to listen to people with more posts as they usually have more experience. you were on the right topic though so I thank you

[blackbird82]

yeah that ROR guy is pretty bang on. but does the governor hang? THe "MAX" fuel screw. really, what it does is limit the potential travel of the flyweights in the governor.  The more you turn it in, the more they are held back. and when they get held back, the springs connected to your throttle lever win the battle and pull the spill collar further on the spill port, resulting in more fuel.

Hence less engine braking, cause after a certain point you never get the sweet, zero injection duration when off throttle at highway speed.

[R.O.R-2.0]

yeah that ROR guy is pretty bang on. but does the governor hang? THe "MAX" fuel screw. really, what it does is limit the potential travel of the flyweights in the governor.  The more you turn it in, the more they are held back. and when they get held back, the springs connected to your throttle lever win the battle and pull the spill collar further on the spill port, resulting in more fuel.

Hence less engine braking, cause after a certain point you never get the sweet, zero injection duration when off throttle at highway speed.

it hangs the governor, but just ever so slightly.

basically not enough so that your engine holds rpms, or runs away, but just enough that when you engine brake, it hangs just a tiny bit.

its supposed to basically shut the fuel off to the engine when you let off the pedal and the engine is braking.. but with the screw in a tad too far, the governor hangs a tiny bit, and cant completely shut off fueling, like it previously did..

just play with your smoke screw till you get it, 1/8 - 1/4 of a turn at a time. turning it out, not in.. turning the screw in will only make things worse..

[Fredrikkk]

Alright well I turned it ever so slightly out and it is all well now. No more hanging and the engine brakes properly  '

Thanks for all help!