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fifthcenturycheese Samba Member
Joined: May 04, 2014 Posts: 172 Location: Pismo Beach
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Posted: Wed Feb 20, 2019 7:35 pm Post subject: Kadrons "popping" when I hit the throttle...why? |
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The motor:
1776
Dual Kadrons (new) Berg linkage
Pertronix flamethrower SVDA + flamethrower coil
110 engle cam
8:1 compression
Timing 7.5 initial
91 octane
pump shots on both kadrons measure to .6 cc
idle jets 55 , mains 135's
carbs synched, butterflies match...
Installed vacuum port on driver side kadron and changed out German 009 with Pertronix flamethrower. Very pleased with results so far, stumble has smoothed out, but when throttle is punched I get a pop from both sides. Not everytime, but a couple times. I feel like I am real close to having it dialed in... Any suggestions on what is happening here? Thanks, Mike
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Mikedrevguy Samba Member
Joined: October 15, 2008 Posts: 2240 Location: Medford, OR
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Posted: Wed Feb 20, 2019 7:50 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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How are they synced? _________________ 74 1303 (RevBug): plan for German Look
76 914 with 2260
79 VW Iltis
69 Bwajaja
"The wise speak because they have something to say; while the foolish speak because they have to say something." Plato
Illigitimi non-Carborundum!! |
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APPLEGREENVW Samba Member
Joined: November 30, 2003 Posts: 2388 Location: Seekonk,Massachusetts USA
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vwracerdave Samba Member
Joined: November 11, 2004 Posts: 15309 Location: Deep in the 405
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Posted: Wed Feb 20, 2019 8:07 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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With 8.0 compression ratio I'd try some 87 octane gas. _________________ 2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK |
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nsracing Samba Member
Joined: November 16, 2003 Posts: 9481 Location: NOVA
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Posted: Wed Feb 20, 2019 8:14 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Are you sure the distributor is advancing properly?
Also, you might want to add more squirt --maybe you need to adjust the fuel advance.
yes, check the synchronization on the carbs. |
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fifthcenturycheese Samba Member
Joined: May 04, 2014 Posts: 172 Location: Pismo Beach
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Posted: Wed Feb 20, 2019 8:32 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Fuel pressure is around or slightly above 1.5 lbs. |
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modok Samba Member
Joined: October 30, 2009 Posts: 26790 Location: Colorado Springs
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Posted: Wed Feb 20, 2019 9:30 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Appears you haven't installed the airfiter or........ the rest of the car yet.
Won't even be able to get it warmed up with no load on the engine. |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12744 Location: Western Canada
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Posted: Wed Feb 20, 2019 10:00 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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modok wrote: |
Won't even be able to get it warmed up with no load on the engine. |
Excellent point!
Also make sure you have the thermostat and flaps installed and working correctly. My Kadrons would not stop popping and farting at part throttle until the engine was fully warmed up - as in - several miles at highway speed. Then without the thermostat they would start popping again after 4 or 5 sets of lights back in town and the engine was too cool again.
Once I added the thermostat there was no more popping in town. |
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fifthcenturycheese Samba Member
Joined: May 04, 2014 Posts: 172 Location: Pismo Beach
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Posted: Wed Feb 20, 2019 11:16 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Modok and Oprn:
Took the engine out to do some adjustments, but I guess I am at the point where I can now "install the rest of the car"...I'm still on my learning curve. Thanks for the input. You guys are absolutely correct, the engine has not been getting hot enough, thermostat is installed and works perfectly.
Will install and post results.
Thanks, Mike |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16757 Location: State College, PA
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Posted: Thu Feb 21, 2019 6:17 am Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Yeah - it should run a bit crappy until fully warmed up unless you have it jetted too fat. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16757 Location: State College, PA
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Posted: Thu Feb 21, 2019 6:18 am Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Yeah - it should run a bit crappy until fully warmed up unless you have it jetted too fat. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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Alstrup Samba Member
Joined: July 12, 2007 Posts: 7221 Location: Videbaek Denmark
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Posted: Thu Feb 21, 2019 8:30 am Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Yeah, not enough cr and not enough timing at idle.
The timing is easy to change. Set it up for 10-12 degrees at idle and limit the advance to 30 max 32 without vacum. That'll help some. The rest is jetting. |
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fifthcenturycheese Samba Member
Joined: May 04, 2014 Posts: 172 Location: Pismo Beach
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Posted: Sun Mar 31, 2019 10:57 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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So, the engine went back in the car and I am extremely pleased with the results! The Pertronix 034 svda cured the problem. The engine needs to warm up for the Kadrons to operate efficiently. The svda really smoothed out the performance of the engine over the German 009. Opening the "already provided" vacuum port was very easy to do without having to send the carburetor off somewhere for a while and at no added expense! Just need a black distributor cap!
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fifthcenturycheese Samba Member
Joined: May 04, 2014 Posts: 172 Location: Pismo Beach
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Posted: Mon Apr 01, 2019 5:45 pm Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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With black cap!
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earthquake Samba Member
Joined: January 10, 2008 Posts: 3984 Location: SANDY VALLEY, NEVADA
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Posted: Thu Apr 04, 2019 1:12 am Post subject: Re: Kadrons "popping" when I hit the throttle...why? |
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Do the discharge tubes for the accelerator pump squirt straight down the vent?
Some times they need to be tweaked over a bit because the squirt on top of the Aux vent and just kinda splash fuel allover when you open the throttle.
Casey _________________ 74 CLASS 11 LOOK-A-LIKE
69 DUNE BUGGY
79 INTERNATIONAL SCOUT II
05 SCION XB SERIES RELEASE 2[#437]
95 Chevy C3500 dually
98 Ford E150
Link to Kelly J. Nolte 3/20/53 - 11/6/08
https://time-zonelabs.blogspot.com/p/about-kelly.html
DEATH TO CHINGERS!
[From a military recruitment poster in the novel "The Stainless Steel Rat" By Harry Harrison] |
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