Jerry,
these guys(SS/nightrider) have a good grip of whats going on
in the realm they are operating in.
but.......these explanations and efforts don't cover what's
going on with the V-4 and cobra pipes.
guys on this list you are pretty sharp have stated that the
problem is that the cobras don't maintain the cross-over pipe between the 2
rear cylinders thus upsetting the backpressure (lower) a nd allowing the
pipes to over scavange the incoming fuel charge and drop power.
perhaps one of those "smart" guys will post the whole story
for us?
steve
>From: "Jerry Novak" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: V-MAX TECH LIST <[EMAIL PROTECTED]>
>Subject: Cobra exhaust and decreased HP - the reason?
>Date: Sun, 10 Sep 2000 18:26:29 -0700
>
>After doing some reading this afternoon, I found this:
>http://www.sscycle.com/Tech.html#anchor296534
>S&S does not recommend drag pipes because there is a reverse pressure wave
>that propogates back to the cylinder, decreasing HP!
>
>The link below:
>http://www.nightrider.com/biketech/exhaust.htm
>describes a modification to break-up that wave, and restore the lost HP.
>
>Since the Cobras are not straight-though pipes, this mod would have to go
>in
>the engine side of the slip-ons.
>
>Regards,
>Jerry Novak
>
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
>Sent: Saturday, September 09, 2000 11:40 PM
>To: V-MAX TECH LIST
>Subject: Re: Airbox "Y"
>
>
>In a message dated 9/10/2000 12:11:54 AM Eastern Daylight Time,
>[EMAIL PROTECTED] writes:
>
><< How can the Cobra exhaust
> (with lower restriction than stock) decrease HP? >>
>When I was looking for an exhaust, every person I spoke with told me that
>the
>Cobra exhaust, for some reason, is the only system that robs HP. That
>bummed
>me out because I had my heart set on it. The guys on this list know their
>shizzit, so if they concur on something, I will usually take their word for
>it.
>
>Frank
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