What could be the answer?

[Boomyal]

This is regarding a boat motor but really has nothing to do with boats. Today I was winterizing my boat and I set about to fog the engine. Running at a fast idle. I squirted the fogger down the primary venturiis, In spraying the left venturii, the motor would stumble. Spraying down the right venturii produced no such stumble. I ended up spraying down the left venturii until the motor died.

This is in a 4 bbl 4160 Holley. The motor idles and runs great and I have no reason to suspect any other difficulties.

Why might this be?

 

[Another retired guy]

Re: What could be the answer?

I'm guessing that the right side is blocked/restricted in some way.

 

[86 century]

Re: What could be the answer?

Winds to me that the idle circuit on one side is out of wack.

When you bring her back out in the spring play with idle screws a bit I would bet one side is out further than the other and the eng is idling on the primary jets

 

[tpenfield]

Re: What could be the answer?

I would imagine that the intake manifold is optimized for flow at the typical operating range and may not flow as evenly at other ranges of speed.

FWIW . . . I could never get my 7.4L to choke on the fogging oil even if I sprayed 2 cans at once.

 

[EddiePetty]

Re: What could be the answer?

I would imagine that the intake manifold is optimized for flow at the typical operating range and may not flow as evenly.........

If you have open phlemns in your 302 intakes, if one idle jet is advanced over the other your condition is very possible.

 

[Boomyal]

Re: What could be the answer?

If you have open phlemns in your 302 intakes, if one idle jet is advanced over the other your condition is very possible.

It is a dual plane Edelbrock Performer intake with the divider intact and a 1" spacer with 4 separate passageways.

 

[Tail_Gunner]

Re: What could be the answer?

Oil does not atomize like gas and is by far heavier...and its a dual plane you dumping a lot of mass where it was not intended to be nor can it go there due to lack of atomization.

Intake Manifolds: Single Plane or Dual Plane? - EngineLabs

Much better link:http://victorylibrary.com/mopar/intake-tech-c.htm

 

[EddiePetty]

Re: What could be the answer?

EXCELLENT point ole gunner from the rear!!!!

 

[Boomyal]

Re: What could be the answer?

From the looks of that diagram, even gas vapor could not get to the right bank? But I kinda do get your point. Gas vapor will follow circuitous paths that an oil might not.