<VV> Surging at cruise

[S M]

I agree with Bob Helt.. the easy way to check is to warm the car up, then at idle, pull the hose off the vacuum advance unit and watch for the advance arm moving. That tells you the idle speed is too high on the right carb. The idle speed screw has opened the butterfly a bit and exposed the advance port to vacuum. 
yea, Vairily ... Shaun 
----- Original Message -----

From: "Bryan Blackwell via VirtualVairs" <virtualvairs at corvair.org> 
To: "VirtualVairs" <virtualvairs at corvair.org> 
Sent: Wednesday, November 11, 2015 7:04:53 AM 
Subject: <VV> Surging at cruise 

Hi folks, 

Now that the seats are in our '66, we've been driving it and I'm back to something I had forgotten about that really is annoying. At any sort of throttle opening to maintain speed, in any gear, the car surges rapidly - a quick, on-off sort of thing like I'm jiggling the gas pedal just a bit. Car starts and idles fine, any bit of acceleration makes the surge go away and the car has good power. Basically idle is fine, accelerating is fine, but in between it just feels a little nervous. It does the same thing cold or hot. 

Patient is a '66 Corsa, with a '66 110. It has the primaries from the 140 in it that were rebuilt some time back and a correct 110 distributor with a Crane XR-700 conversion. It does have individual air filters and an electric pump but did the same thing with the stock parts. There's no obvious miss, the carbs are balanced, and it sure feels like it's running on all 6 pulling away from a light. 

Where should I start looking? 

--Bryan 

Bryan Blackwell | Springfield, Va. | bryan at skiblack.com | http://autoxer.skiblack.com/ 
CORSA Eastern Div Director 
Corvairs: '62 700 Wagon, '64 Greenbrier, '65 Corsa, '66 Corsa 
'69 Road Runner, '99 Neon R/T, '00 Miata SE, '09 Ford F-150 
"Why do something if you're not going to obsess about it?" 



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