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Runs Like a Scalded Dog
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Jon
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Joined: 01 Jun 2006
Posts: 2421
Location: Bishop GA

1969 Volkswagen Type 3

PostPosted: Tue Sep 28, 2010 8:33 am    Post subject: Runs Like a Scalded Dog Reply with quote

At Volkstock I addressed some issues that I attributed to my carbs. When the engine was cold it would pop thru the idle jets. Once it warmed up the problem lessened, but I still had a dead spot as I hit each gear, which I thought might be accelerator pump jets that were too big.

At Volkstock I cleaned all my idle jets, removed the mixture screws and cleaned them, blew out the idle curcirts, and installed #35 accel pump jets in place of the #50s. Reassembled and Clyde adjusted the mixture screws. The screw for #1 had no effect; turned all the way in to backed all the way out there was no change in idle. After messing with it for a while, it was set to the same setting as the others and left there. Drove home in the rain and it ran fairly well. The engine was warm when I left from the adjusting.
Monday morning the engine is cold and it pops thru the jets for the first mile. Once it warms up it runs better, but still not like it should. The dead spot is still there, just not as bad. One thing I do notice is a different sound from the carbs. I can always hear the air being sucked thru the carbs, but one seems to be pulsating and not a steady draw unless I am accelerating hard.

Does this sound like a carb issue as I have been assuming, or could it be a problem with the distributor?

One other note; on the way to work today it was popping in the carbs, then as it warmed it was popping thru the exhaust. My head temps were higher than usual today. They are usually around 320 and today went to just shy of 350. Outside air was 56 when I left the house. Give me some ideas cause it isn't much fum to drive, but right now I've got nothing else. Crying or Very sad
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Last edited by Jon on Fri Oct 08, 2010 3:11 pm; edited 1 time in total
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Mountain Power House



Joined: 26 Jul 2006
Posts: 879
Location: Aircooled Heaven USA


PostPosted: Tue Sep 28, 2010 10:36 am    Post subject: Reply with quote

Most carburetor issues are really ignition issues.. That said, I'd change the dizzy to introduce a variable and see what the results are. Lazy advance, or advance thats too fast will both give a huge flat spot just off idle, like what you describe.

The reason why the heads were hotter this morning is because it was cooler outside... The CHT gauge is calibrated to be 100% accurate at 76*F, for every degree that you are under 76F the CHT reading will be 1* hotter than relative. For every degree you are above 76F the CHT value will be 1* cooler than relative.

So this morning, if it was 50 degrees your CHT reading was 26F hotter on the gauge than the actual temp at the thermocouple on the head... Since it was 56 outside when you left the CHT was reading exactly 20 degrees hotter than the actual temp at the thermocouple.

If it
's 100F ambient the effect is backward and the heads are really 24* hotter than the gauge reads.

This is because the gauge and sender are not temperature compensated.
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Jake Raby
57 Oval
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Jon
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Joined: 01 Jun 2006
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1969 Volkswagen Type 3

PostPosted: Tue Sep 28, 2010 12:01 pm    Post subject: Reply with quote

Thanks Jake. I'll try a different dizzy after work.
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serprice



Joined: 26 Nov 2007
Posts: 349
Location: Statham

1974 Volkswagen Beetle

PostPosted: Tue Sep 28, 2010 7:38 pm    Post subject: Reply with quote

Sounds like a vacuum leak to me innocent0009
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Mountain Power House



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PostPosted: Tue Sep 28, 2010 8:53 pm    Post subject: Reply with quote

Could be, but if it were the idle would be erratic and inconsistent, especially with different engine temps..
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Jake Raby
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Jon
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Joined: 01 Jun 2006
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1969 Volkswagen Type 3

PostPosted: Tue Sep 28, 2010 9:19 pm    Post subject: Reply with quote

Shane called it! Wink The gasket under the driver's side intake is bad. I guess that is why the mixture screw has no effect. I also assume that is why it has been popping thru the exhaust when I let off the gas.

Jake do you have any gaskets you could sell me? Clyde hasn't been able to stock them yet.

We also changed distributors, but changed them back when we found the leak. When retiming the engine it became apparent the dizzy I have in there now only has about 12-14 degrees of advance. I think I'll try the original 009 again.
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Adams77



Joined: 07 Oct 2008
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Location: Statham, GA


PostPosted: Tue Sep 28, 2010 9:34 pm    Post subject: Reply with quote

yeah, Shane is freaky like that.

One time I told him the car was making a strange noise and he said "hold the phone up to the dash I think I can fix it from here" Cool
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serprice



Joined: 26 Nov 2007
Posts: 349
Location: Statham

1974 Volkswagen Beetle

PostPosted: Tue Sep 28, 2010 9:54 pm    Post subject: Reply with quote

I thought that when he said that one mixture screw made no difference but I never heard it run. Today after he swapped dist. I helped him time it and I notice it had a bad lean miss at idle and the dist didnt help the flat spot. Once I listened to it for a sec I had a brain fart. Rolling Eyes I guess I couldve listened to it before he did all that stuff for nothin... my bad! Very Happy
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Mountain Power House



Joined: 26 Jul 2006
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PostPosted: Wed Sep 29, 2010 5:02 pm    Post subject: Reply with quote

Must have ben a bad leak not to be surging at idle..at least you found it.
I blamed it on the 009 because they generally cause that issue and the engine has had hesitations for a while.

16 degrees of advance is perfect for TIV.. That way you can set it at 12/28 full advance and be perfect. Need to get it back on the rollers again.
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Jake Raby
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Jon
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Joined: 01 Jun 2006
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1969 Volkswagen Type 3

PostPosted: Wed Sep 29, 2010 5:37 pm    Post subject: Reply with quote

Mountain Power House wrote:
Must have ben a bad leak not to be surging at idle..at least you found it.
I blamed it on the 009 because they generally cause that issue and the engine has had hesitations for a while.

16 degrees of advance is perfect for TIV.. That way you can set it at 12/28 full advance and be perfect. Need to get it back on the rollers again.

We pulled the 009 a year ago at Volkstock 3 and put in the current vacuum advance. If 12/28 is good, we are set as that is where it is now. All I need is new intake gaskets and I'm back on the road.

Where can I get those gaskets?? innocent0009
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Mountain Power House



Joined: 26 Jul 2006
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Location: Aircooled Heaven USA


PostPosted: Wed Sep 29, 2010 9:22 pm    Post subject: Reply with quote

Beth and I will be at Petit Le mans the rest of the week.. If you make a trip to Cleveland, Dean can set you up with the exhaust gaskets and a pair of intake gaskets.
Otherwise it would be Tuesday before I could get anything to you as I won't be back at the shop.
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Jake Raby
57 Oval
64 Porsche 356C Outlaw
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79 VW Iltis 4X4
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Jon
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Joined: 01 Jun 2006
Posts: 2421
Location: Bishop GA

1969 Volkswagen Type 3

PostPosted: Fri Oct 01, 2010 4:21 pm    Post subject: Reply with quote

Thanks Jake. I got by there this afternoon and picked up the gaskets.
The new asphalt is super nice. I can get up that hill REALLY fast now. Twisted Evil
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Mountain Power House



Joined: 26 Jul 2006
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PostPosted: Sat Oct 02, 2010 9:35 am    Post subject: Reply with quote

Glad you got what you needed.. I am loving that driveway!
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Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4
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Jon
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Joined: 01 Jun 2006
Posts: 2421
Location: Bishop GA

1969 Volkswagen Type 3

PostPosted: Fri Oct 08, 2010 3:15 pm    Post subject: Reply with quote

Got everything back together and all my engine problems are sloved except the big flat spot and we're working on that some more tonight. Cool

I've essentially been driving on 3 cylinders for the last month or so. It is much more fun using all 4!
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Jon
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Joined: 01 Jun 2006
Posts: 2421
Location: Bishop GA

1969 Volkswagen Type 3

PostPosted: Sat Oct 09, 2010 4:40 pm    Post subject: Reply with quote

OK we tried bigger idle jets. Made the dead spot worse so switched back to original jets and removed a spring from the dizzy to make it advance faster. It advanced too fast so we changed it back. Adjusted dizzy to advance slightly slower-still not better. That's where we are now. Gonna try the German 009 in it again to see what it does. If that doesn't help, I'm open to suggestions.
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