[TR] Travel and tuning question

[Dave Connitt]

Tony,
Several people responded the same regarding not having to adjust the carbs for altitude due to their design. There was one comment regarding a group of Triumphs traveling up Pikes Peak having fuel starvation issues related to mechanical fuel pump cavitation. Others in the same group that had electric fuel pumps had no problems. I’m not sure if I want to go that far or not but I have a few months to decide. If I decide to install an electric fuel pump then I have to install an inertia switch too I suppose..I wonder if I can install the electric pump in series between the tank and mechanical pump as a backup?
Dave


Sent from my iPhone

> On Dec 3, 2022, at 6:40 AM, Anthony Rhodes <spamiam at comcast.net> wrote:
> 
> I strongly suspect that the “Constant Depression” design of the SU and ZS carbs compensates for altitude a fair amount.  So, the mixture is probably going to be reasonably good.   
> 
> What you cannot compensate for is the fact that there is just less air up there.  You will get fewer HP up at high altitude.
> 
> Now, a nice turbocharger (aka Turbosupercharger, which seems like a cooler name) would help that. :)
> 
> -Tony
> 
> Sent from my 1837 Babbage Analytical Engine
> 
>> From: Dave Connitt <dconnitt at fuse.net>
>> To: Triumphs <triumphs at autox.team.net>
>> Subject: [TR] Travel and tuning question
>> Message-ID: <F4542DD9-3BA7-4684-8DBB-C189C5AB6717 at fuse.net>
>> Content-Type: text/plain; charset=utf-8
>> 
>> Hi all,
>> This coming summer my wife and I are planning a fairly long trip in my TR4A  leaving from Cincinnati, Ohio (altitude approximately 500?). Our first destination is going to be Colorado Springs, Co. to drive up Pikes Peak (altitude approximately 14,115?). Then north to Mt. Rushmore (altitude approximately 5,700?), then north to drive through Yellowstone national park (altitude approximately 9,200?). That?s going to be quite a swing in altitude and I am wondering if I will have to occasionally tune the SU HS-6 carbs? Has anyone on the list done a similar drive? If so, how did your Triumph run and what did you have to adjust?
>> Thanks in advance!
>> Dave Connitt
>> ?67 TR4A-IRS
>> DavesTR4A.com
>