<VV> VirtualVairs Digest, Vol 177, Issue 7

[hallgrenn at aol.com]

FWIW I don't know the engineering reasons for the steps, but there probably were good ones.  Some of my carbs on my high mileage Corvairs did get worn, but dressing the rounded notches with a flat file gave them their "edge" back.
Bob Hall

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Sent: Sat, Oct 5, 2019 10:50 PM
Subject: VirtualVairs Digest, Vol 177, Issue 7


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Today's Topics:  1. Re: Carb idle cam mod?
Message: 5
Date: Sat, 5 Oct 2019 22:49:56 -0400
From: FrankDuVal <corvairduval at cox.net>
To: virtualvairs at corvair.org
Subject: Re: <VV> Carb idle cam mod?
Message-ID: <c99b576c-ce56-34b9-1b07-a712f29c4dfe at cox.net>
Content-Type: text/plain; charset=utf-8; format=flowed

My curious question is, what happens to all the fast idle cams that came 
on the carburetors to be rebuilt?

I see no reason why a curve would not work in place of the steps. Only 
exception is the setting of certain adjustments that rely on steps, 
like: Place fast idle tang on second step of fast idle cam next to 
highest step.

Frank DuVal

On 10/5/2019 12:26 PM, Grant Young via VirtualVairs wrote:
> One of the HV carburetor parts I am regularly scrounging for is the 63-69 fast idle cam. I have been trying to get some reproduced without much luck. My last attempt has resulted in a comeback of no, because of the difficulty in cutting the steps that ride on the end of the throttle lever. So, I'm wondering what the problem might be to just have a smooth contact area in an arc (cam) that follows the low areas to replace the steps? There are many other style carbs that work that way, and I'm not able to determine why there are steps in the first place other than to compensate for the "slop" in that system. I have noticed that the cam goes straight from the top step to no step with the pump of the accelerator, if the engine warms quickly. Input as to whether it would still work okay will be appreciated. And, if anyone has a collection of cams they would like to sell, please let me know.
>


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End of VirtualVairs Digest, Vol 177, Issue 7
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