I worked on this for my TR4A with stock engine and everything.
I forget the details but as I recall the mixture needed to be a bit richer.
Again, as I recall, pure ethanol needs to be quite rich compared to pure
gasoline.
I then computed the added mixture for E10. Then I calculated the open area of
the stock needle in the jet. I made a first approximation that the mixture is
directly proportional to the open area between the needle and the jet.
So I needed to calculate a smaller diameter such that the area was the correct
proportion larger. I then did that for each of the "stations" on the needle
specification.
I then used an excel spreadsheet that can search for the closest overall match
for the hypothetical needle profile. As I vaguely recall it was RL. I'd have
to check on that.
I put that needle in the carbs and it runs fine and a wide band oxygen sensor
up the tail pipe said the mixture was quite reasonable throughout the full
power range
-Tony
Sent from my 1837 Babbage Analytical Engine
> On Jun 7, 2019, at 2:00 PM, triumphs-request@autox.team.net wrote:
>
> Message: 2
> Date: Thu, 6 Jun 2019 13:05:47 -0700
> From: "Randall" <TR3driver@ca.rr.com>
> To: "'Pete Arakelian'" <Arakelianp@mossmotors.com>,
> <triumphs@autox.team.net>
> Subject: Re: [TR] U.S. EPA Finalizes Rulemaking to Permit Year-Round
> Sales of E15 Gasoline
> Message-ID: <02CFBDF94A114C64BBA34ABFF7FB0EFB@RYPC>
> Content-Type: text/plain; charset="us-ascii"
>
>
>> EPA has authorized year round sale of E15. What is that
>> going to do to our cars?
>
> Not much, especially if you don't put it in the tank.
>
> Seems like a sales opportunity to me, though. Find (or have made) some carb
> needles that are better calibrated to E15 and the world will beat a path to
> your door.
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