<VV> Turbo Carb
jvhroberts at aol.com
jvhroberts at aol.com
Sat May 23 14:34:17 EDT 2009
The YH can be made to work well, and I had no trouble doing so. However, if the goal is to get a buttload more air through the carb and make more boost, the YH has serious limitations. I've bored a couple, with some luck, but the SU is a major step out of the box in this respect. No way will a YH flow what a 2" SU flows.
And as far as the hole through a YH, it's pretty small for a 150-180HP engine. But then again, GM intended that small venturi to be the boost limiter. I remember measuring as much as 12" Hg vacuum between the YH and compressor inlet, and that's pretty damn restrictive.
From: Tony Underwood <tony.underwood at cox.net>
To: virtualvairs at corvair.org
Sent: Sat, 23 May 2009 12:57 pm
Subject: Re: <VV> Turbo Carb
At 11:15 PM 5/21/2009, Smitty Smith wrote:
>To say the YH carb is a POS or that it can't be made to work right
>is defeatest and misleading at the least.
Kinda makes me wonder why Carter made the things for decades if they
don't work right.
>Sure there are several better carbs. Get a yh right and it will
>allow your low compression turbo to idle with the best 95 twin carb
>for a half hr at a stretch without loading up. Open the throttle
>and it will pass a surprising amouut of controled fuel air mixture
>for the size of its venturi. Educated tinkering with its metering
>rods can give a smooth flow of power from idle to over 5000 rpm with
>no problem. The fact that it limits ultimate engine output was
>planned by the engineers to save the engine from destruction by the
>owner. The 150 carb is more conservative than the bigger 180 of
>course. Even a high output turbo can't pull enough air through a
>180 carb to make a beast out of the engine. Good performance is
>about all you can hope for, with emphisis on "good", not exceptional.
There's that old magazine article that managed to extract well over
200hp from a turbo engine using that YH... and mostly stock GM
parts. I thought that was pretty good, using 1960s tech.
By the way: That YH is not a very small 1xbbl carb. There's a
respectable size hole through it.
>I am defensive about the Generals economical choice of a carb for
>the turbo. It does a good job for what he spent for it. If you say
>it is a POS then you better come armed with some facts. I mean
>other than you aren't mechanic enough to make it work as designed.
I always managed to get them to work, by hook or by crook, one way or
the other. Thus, I never felt the need to change out a YH for
...except another YH.
"Everybody gots one..."
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