1981 E4ME carb question

[rlsterling3]

Hey everyone, I've been searching the threads and can't quite find the answer I was looking for so maybe someone here can help. I noticed quite a few older threads by Sensei talking about the performance upgrades he had done for some forum member on the 1981 CC carb (E4ME) I am going to be rebuilding the carb soon and his post mentioned that his build would be excellent on a modified engine. The 81 I have has been bored .30 over, new pistons, cam, etc. I'd really like to build a performance version of this carb but I can't find any information as to what he actually modified on the carb. I've sent him a PM but it appears that he hasn't been active here for a few years. Does anyone know what modification or adjustments he made to the carb? I know there were a few forum members here that were running his modified carb, any info or tips for me? Thanks for the help.

 

[Peer81]

Hello,

First welcome to this Corvette forum
If you have a 81 Corvette or with your E4ME questions the L81 section has more members with knowledge about this single year used carb.
Chris (Sensei) his 81 was stolen and a joyrider totalled the vette so that is why he isn't around anymore. :cry

But back to the carb. All te mod's Chris did you can find them in the Q-jet book by Cliff Ruggles and Doug Roe!

I would like to say, first rebuild the carb in stock mode the best way you can with these two books (Cliff's book is better with pictures). After that and if you totally understand the carb buy another one from ebay (better buy 2!) and modify that one. I f*cked a few up while rebuilding and modifying.

Most important things you want to do is make sure the ball bearing next to the acc well is sealing perfectly, this will stop the very lean moment and hessitation you could have when putting the pedal to the metal. In addition to this you can make some moon shaped transfer openings in the big butterfly valves right behind the acc openings. This will give the acc openings some vacuum as the seconairy throttle opens and fuel can start flowing.
Some other things, you can check if the throttle valves are at 90 degrees comparted to the throttleplate. But I also read in Dougs book that the rear cylinders are running lean all the time so giving them some extra air and fuel doesn't hurt anyone.
Second but more important, check if the throttle truly goes all the way open, also check this with your throttle cable and adjust.

As for Chris his summary, without the technical idea behind it you still don't know what to do so buy the two books and you're on your way

Greetings Peter

 

[bill81vette]

Welcome to CAC!!!!
enjoy!!

If you would like your thread moved to the L-81 section let me know and I'll move it.

 

[rlsterling3]

Hello,

First welcome to this Corvette forum
If you have a 81 Corvette or with your E4ME questions the L81 section has more members with knowledge about this single year used carb.
Chris (Sensei) his 81 was stolen and a joyrider totalled the vette so that is why he isn't around anymore. :cry

But back to the carb. All te mod's Chris did you can find them in the Q-jet book by Cliff Ruggles and Doug Roe!

I would like to say, first rebuild the carb in stock mode the best way you can with these two books (Cliff's book is better with pictures). After that and if you totally understand the carb buy another one from ebay (better buy 2!) and modify that one. I f*cked a few up while rebuilding and modifying.

Most important things you want to do is make sure the ball bearing next to the acc well is sealing perfectly, this will stop the very lean moment and hessitation you could have when putting the pedal to the metal. In addition to this you can make some moon shaped transfer openings in the big butterfly valves right behind the acc openings. This will give the acc openings some vacuum as the seconairy throttle opens and fuel can start flowing.
Some other things, you can check if the throttle valves are at 90 degrees comparted to the throttleplate. But I also read in Dougs book that the rear cylinders are running lean all the time so giving them some extra air and fuel doesn't hurt anyone.
Second but more important, check if the throttle truly goes all the way open, also check this with your throttle cable and adjust.

As for Chris his summary, without the technical idea behind it you still don't know what to do so buy the two books and you're on your way

Greetings Peter

Thank you for the response. I am planning on rebuilding this carb. I have been tossing around the idea of replacing it with an older carb and changing out the distributor etc. To run with the computer or without it... seems to be a question thats often asked around here. I'm actually buying another qjet from a guy this weekend for $50. I'll be rebuilding them both.