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Guest Message by DevFuse
 

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What jets you using? 1979 EA71 with weber, Also-timing issues


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11 replies to this topic

#1 Demon Brat

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Posted 16 August 2014 - 06:04 PM

Just finished rebuilding my son's 1979 BRAT with a EA71.  We put a Weber 32/36 DGAV 33B1 on it and want to make sure we put the right jets in it.  We have not changed anything yet...slapped it on right out of the box.  Right now we have to turn the idle mixture screw out 3.5 turns to get it to idle smooth.  Seemed to  be running rich.   Research says I need bigger jets.

 

You guys could save me some time and money if I could find out what jets you guys are using in your weber.

 

Details...Standard bore, 1979 Subaru Brat EA71, electric choke.

 

I have both valve covers t-together and running into the breather.  The PVC valve in the intake also runs to the breather. (hope this is ok??)

 

AIS is gone, EGR still hooked up.

 

Having issues getting the timing right...runs and sounds best about 20 degrees BTDC,

 

Help me out knowledgeable ones.... :clap:

 

Thanks,

Shawn and Michael

 



#2 ferox

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Posted 17 August 2014 - 12:16 PM

Timing should be 8-10.

 

Jetting is listed in my signature.

 

You are going to want to do more research to find the proper PCV routing.

 

You say it's an electric choke but list a DGAV carb?



#3 Demon Brat

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Posted 17 August 2014 - 04:12 PM

Yep, it has an electric choke.  Here is what the stamp on the base cof the carb says...

 

   32    36

DGAV33B1

 

Got the timing resolved.  Had to cap off the vaccum on the PVC and Distributor.  Dialed the carb in the best I could and hit 8 degrees perfect.,  It is running smooth now.  Still need the idle mixture screwed out too far.  

 

Thanks.



#4 ferox

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Posted 18 August 2014 - 01:27 AM

I take it you bought a used carb and someone swapped out the original coolant choke for an electric choke.  

 

Now you just need to verify your jetting and get your PCV system corrected.  

 

I suspect you do not have a 50 for a primary idle jet at the moment.



#5 Dirk

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Posted 18 August 2014 - 04:37 PM

Not sure what your emissions rules are over there but if you can get away with it I would cap the PCV and let the breathers vent into the air.

 

Not the most environmentally conscious method but it does keep the induction system clean.

 

I have one breather hose up near the radiator fan and one trailing down beneath the car.  In theory this should allow fresh air circulation.

 

Why do I suggest this?  In my experience even correctly setup PCV systems get clogged up and ultimately spew emulsified oil into the carb and manifold.  My solution is not perfect but if you change your oil regularly then there should not be a problem.

 

Cheers,

 

Dirk

 

 



 



 



#6 lvsarge

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Posted 26 August 2014 - 03:55 PM

Did the OP find out his jet sizes? I'm curious as I am going to rejet mine and I was running similar to him before I tore apart my motor.



#7 Demon Brat

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Posted 28 August 2014 - 11:26 AM

Hoping to pull the jets this weekend and see what size.  Can't get the kid to leave it at home long enough to check.  I will post after I look at it.



#8 Demon Brat

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Posted 01 September 2014 - 05:23 PM

So my primary and secondary idle jets are 50.  I have the timing set perfect at 8 degrees BTDC.  I have to back out the idle mixture screw 3.5 turns to get a smooth idle.

 

Do I go with a 55 or 60 jet to get my idle mixture turns down to 1 or 2 turns?



#9 ferox

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Posted 01 September 2014 - 08:22 PM

How many turns do you have on your idle speed screw?



#10 Demon Brat

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Posted 01 September 2014 - 08:46 PM

 I have about 1/2 turn past contact on the Idle speed screw and about 3.5 turns on the idle mixture screw.



#11 ferox

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Posted 02 September 2014 - 01:26 AM

Have you verified the rest of the jetting and cleaned and inspected the air bleeds?



#12 Demon Brat

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Posted 17 September 2014 - 10:38 AM

Replace the primary Idle jet with a 60 and the secondary with a 55.  I had 50s in both.

 

Idle mixture screw is now screwed out 1.75 turns.  The idle speed screw is in about a turn, idle so much better, cleaner exhaust, no hesitation during quick acceleration, idles like a dream.

 

Never thought different jets could make that much different.  






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