Continued Troubleshoot on Gassy Engine

But would 50CFM really make that much of a difference???

If folks can run a small 650 on a 350 [ stock is 750] surley a BB can handle a 750 no ehy???

Just asking.

 

Thanks, Everyone!
It is an 800 cfm Q-Jet, and I can tell you right now that the primary throttle plates are open a lot more than "just a hair" in order to get the engine to idle. I've tried some plates with a hole in 'em, and it did help the mpg, but as I said, the throttle has been opened quite a bit to get the car to idle. I know the balancer is dead on. The only thing that worries me is that I was showing above 12" advance at 800 rpm before my timing light hit the fan.
Another thing worries me, until I get a bigger cam, I guess I'll have to hang out with guys who have smaller cams.
-Gabe

 

Gabe just out of curiousity what is the altitude in Sweet Home. I don't know if its high enough to make a difference but its up there aways. Good Luck
Bob H.

 

OK Larry not enough to make a big difference. For some reason I thought it was higher than that. Thats what I get for doing my own thinking.:laugh:

Bob H.

 

That's my guess. But why he has to open the throttle that far to idle is the real culpret. This is interesting. I hope we get it nailed because I think we can all learn from this one.

And yeah, check the fuel pump. If you have that much fuel in the oil, then either it is washing off the cylinder walls or leaking from the pump. I'd seriously consider changing that oil daily if you plan to run it a lot to fix this. You don't want to burn the crank bearings from thinned oil.

 

Thanks again for all of the advice.
I was able to take a look early this morning before work. In the primary bores while the engine was idling, I'm getting big drips of fuel from the nozzles. With the slightest provocation, the accelerator pump quirts gas into the chamber. It is very sensitive. If I touch the throttle linkage without changing the rpm's, it'll squirt. Both of these combined is resulting in gas pooling on the throttle plates. It's all raw fuel. No break up or atomization at all. It sure is good to finally see something concrete relating to this problem.
I'm not able to get the rpm's that much higher by advancing the timing, so changing the angle of the throttle plates may take some more work. At least now there is an indication of what my problem might be.
It would be good to have another set of eyes take a look. Especially someone who knows Buicks. So far the advice I've gotten locally has been "shoulda' put inna crate motor"!
Thanks, Gabe

 

Yea a crate motor won't fix a carb problem

Must be cheby guys.


Good luck on the fix.

 

I find it difficult to believe it is a straight carb problem because he said he's tried 3 different carbs. I doubt all 3 of them could have the exact same problem.

This sounds like a timing issue or a vacuum leak. I say replace the intake gasket and see what happens.

 

I know its a 455 but Im the king of timing problems, and never came across that.

Has to be some what carb, unless he just has to much fuel pressure, why all 3 carbs were leaking ehy?

Though either way we are all bound to learn something from it.

 

Ahhhh ok I get what you mean.
[you need to help me wrap my brain around my problem.]


{Nozzle drip, not just an old mans problem }