.. a backup electric pump is not a bad idea. They should be installed at
the rear end (pushers, not pullers), having said that, a spare
mechanical is quite easy to install on a TR on
 the side of the road unless at the top of a mountain with frozen
fingers.. lol
DaveP
On 12/3/2022 8:25 AM, Dave Connitt wrote:
> 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. Iâ??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@comcast.net> wrote:
>>
>> I strongly suspect that the â??Constant Depressionâ?? 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@fuse.net>
>>> To: Triumphs <triumphs@autox.team.net>
>>> Subject: [TR] Travel and tuning question
>>> Message-ID: <F4542DD9-3BA7-4684-8DBB-C189C5AB6717@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
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