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Topic: New Engine, tuning help? (Read 1443 times) previous topic - next topic

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New Engine, tuning help?
So, I picked a rebuilt motor up from this guy out in Estacada... I wasn't paying a lot of attention to the parts beyond I saw it was a 1641.  So basically stock motor.  It's for a 74 super beetle that is my Son's fiancée. One of the thing I wasn't thinking about until I got there and he mentioned it again was he put an Engle 110 cam in it. It showed some lope in the motor as he bench ran it. But it seems to be running ok...

Well, here I am, with a 009 dizzy on a 34 Pict3 carb and an Engle 110 cam.  Pulling my hair out trying to get this thing to run right. I don't expect it to not have a lope to it, but I don't want it dying at idle (if you can call it an idle). It also will barely start when hot, you have to slightly keep the chock on and runs in spurts (power spurts?) when going down the road.

Idea's / Suggestions?  I think I have a paid of Kadrons I can toss on it I suppose.  Or, can I get it running right with a Pict3?
RyanB
 
66 Baja

Certified Project addict

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Re: New Engine, tuning help?
Reply #1
I could hook you up with a better distributor...I have several SVA or SVDA distributors
lying around.  That would help with your pict3 carb
1971 Super Beetle

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Re: New Engine, tuning help?
Reply #2
I'll take you up on that sir! I've never been a fan of the 009 at all!

I think I would like to also go to a pertronix setup. Anyone have a used one for sale?
RyanB
 
66 Baja

Certified Project addict

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Re: New Engine, tuning help?
Reply #3
Is it a known-good carb? Distributor is a distributor.  It doesn't change at idle.  Where the 009 has it's issues is its advance curve not being all that great and can have a flat spot. I've run plenty of 009's and can't think of one that had the flat spot but that's what they say.  The SVDA is a better choice but I can't see it solving your issue.  Thought about putting a smaller carb on like the 30PIC?  They don't have the air bypass screw that makes tuning the 34 a challenge.  I personally have never tuned a 34.  The ones I have had already had a decent tune on them and worked fine. 

Are you setting the points with a gauge or a dwell meter?  It can make a difference.

What color are the plugs?  Are they white, brown or black?  Assuming you put new plugs in, too lean will be white, too rich black.  Brown is just right.  The plugs will tell you a lot about how the carb is working.  Too lean will make the engine overheat.  Too rich will do the same thing but not as quick.

Is the fuel shut off working?  Hear it click when power is removed/replaced? (this will make it die at idle too)

Just checking on some of the basics.
Mark

1967 Convertible
1967 Ragtop (really)-SOLD IT!
1967 Standard Bus
1974 Thing
1977 Rabbit

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Re: New Engine, tuning help?
Reply #4

So, I picked a rebuilt motor up from this guy out in Estacada... I wasn't paying a lot of attention to the parts beyond I saw it was a 1641.  So basically stock motor.  It's for a 74 super beetle that is my Son's fiancée. One of the thing I wasn't thinking about until I got there and he mentioned it again was he put an Engle 110 cam in it. It showed some lope in the motor as he bench ran it. But it seems to be running ok...

Well, here I am, with a 009 dizzy on a 34 Pict3 carb and an Engle 110 cam.  Pulling my hair out trying to get this thing to run right. I don't expect it to not have a lope to it, but I don't want it dying at idle (if you can call it an idle). It also will barely start when hot, you have to slightly keep the chock on and runs in spurts (power spurts?) when going down the road.

Idea's / Suggestions?  I think I have a paid of Kadrons I can toss on it I suppose.  Or, can I get it running right with a Pict3?


I doubt it is the distributor unless the shaft bushing is so worn that the radial runout causes the point gap to change significantly as the shaft turns and flops around.

More-likely causes are a vacuum leak or a blocked primary jet in the carb.

Is the carb mounting tight and well sealed? Are the manifolds tight to the head and well sealed? Are the rubber boots on the manifold joints sound? One test is to spray these areas with carb cleaner. If the engine smooths out you found a problem.

Also make sure all the vacuum outlets on the carb are capped -- there are lots of them on a 34 PICT.

Are the valves properly adjusted?

Last two times (My Bus and FIAT 124 Spider) I had this problem it was dirt in the primary jet.

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Re: New Engine, tuning help?
Reply #5
Thanks for the replies everyone.

I ended up putting on a pair of Kadron's as mentioned and she is purring like a Kitten.

I had 3 other Pict 34's in my stash and I went through each one. They all acted similar.

A new set of plugs and she is running well now (So far, this IS an aircooled...)

I really think the Pict34 Center mounted carb just couldn't handle the intake pulses from the larger Cam.
RyanB
 
66 Baja

Certified Project addict

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Re: New Engine, tuning help?
Reply #6
 :2up:
Mark

1967 Convertible
1967 Ragtop (really)-SOLD IT!
1967 Standard Bus
1974 Thing
1977 Rabbit