I bought this 32/36 used and its now installed on my '86 hatch. Runs very well with proper jetting and hopefully all vac leaks sealed up. But, it wants to idle at 1200. I believe the carb is tuned properly and the electric choke is set right. Still idles too high. My question is, would this little hole drilled thru the primary butterfly cause a high idle. Also, what would be the purpose of ever drilling a hole thru the butterfly.

 

 

 

 

 

That is weird... and yes, it could be the cause,

 

because it lets more air to get in, despite the butterfly is closed.

 

I Kindly suggest you to obtain another butterfly and change it.

 

Kind Regards.

Thanks, Jeszek. Ill switch it out, see if it changes anything. I got the weber from a guy who had it on a Chevy 4.3 Vortec. 200 Mains!

What jets are you running in it now ? I can only imagine how it'd run with 200 mains lol I have an 86 hatch with a weber as well & I've been thinking about playing with jets. My mpg is a little poor.

 

Thanks, Jeszek...

 

 

You're Welcome.

 

I bet he had idle problems, maybe he changed both mains to 200 while kept the air needles stock and weren't enough to keep that engine idling, and thus might explains why he drilled a hole on one butterfly...

 

The mains on my Weberized EA82 are 140 in low and 162 in High, but Redline-Weber sells their kits for EA82's with both @ 140.

 

Good Luck!

Kind Regards.

... I have an 86 hatch with a weber as well & I've been thinking about playing with jets. My mpg is a little poor.

 

 

Since EA81's and EA82's are pretty similar, I suggest to run the Weber with 140 on both Low & High and try driving it in mixed conditions; if your mileage is poor, maybe you might reduce the low one to 120... The original craptachi carb on my EA82 came jetted from factory with 116 on Low, as far as I remember.

 

Kind Regards.

What jets are you running in it now ?

I think it was GD's recipe I found here on the board. I ordered everything online exactly how it was written.

Seems right as the ea81 runs well enough but I gotta figure out this idle. Before the new jets arrived, I ran the weber with the 200s. Within a couple miles driving down the road, I was heading back home with my head hanging out the window trying to escape the gas fumes. Yeah, it was running a little Rich.

Edited January 13, 201412 yr by markjw

I bought this 32/36 used and its now installed on my '86 hatch. Runs very well with proper jetting and hopefully all vac leaks sealed up. But, it wants to idle at 1200. I believe the carb is tuned properly and the electric choke is set right. Still idles too high. My question is, would this little hole drilled thru the primary butterfly cause a high idle. Also, what would be the purpose of ever drilling a hole thru the butterfly.

 

 

 

 

 

 

Yeah,that will give you a high idle.

 

Holes are added to throttle butterflys  in order to change the timing of the transition ports in the idle circuit.

Completely normal for some applications.

 

Sometimes they are added to compensate for a lumpy cam w/poor idle qualities.

Often.in order to get an acceptable idle speed w/a hot cam,throttle butterfly is too far open,uncovering the transition ports at idle(undesirable).

 

In your case,hole was added in an attempt to compensate for the added idle airflow requirements of a 4.3 engine(too large for this carb).

 

Adding a hole to the throttle plate allows it to close furthur and cover the transition ports at the same idle airflow.

 

I would solder some copper or brass over the hole and call it done.

Or a nut and screw,peened over to hold them in.Or a rivet or epoxy or .........

Edited January 13, 201412 yr by naru

naru, thanks for the explanation. I know I've seen small holes drilled in carb butterflies in the past, never knew the reason. And yeah, when he said Chevy 4.3, I thought that was a bit much for a weber regardless of jetting. Was a Toyota truck, wheeler application.

Drilling holes in your primary butterfly is a BAD Idea. I took the butterfly out of another 32/36 I have. And WOW. What I thought was a acceptably tuned weber is now SO much better. The un-holed butterfly changed EVERYTHING. After preliminary tune, I was even able to idle down to 200rpm and it actually ran decent. It fixed a slight dieseling problem I was having as well. Im feeling a lot better about running around in this hatch now. I do love F.I., thou. Thanks for all the help!

Glad to know that changin' butterflies fixed it!

 

Kind Regards.