[TR] TR4A carburetors woes
piggerp at comcast.net
Tue Jul 29 15:31:53 MDT 2014
I replaced the Grose float valves with needle valves. I also put in new
fixed floats. I used a color tune and set the carbs to the proper mixture
(I think) The Colortune goes yellow at high RPM but is blue at idle. I
checked the mechanical fuel pump which seams to pump a good flow of gas. It
ran great and I thought I was done, but after going up a hill for about a
mile it started to stutter. I noticed if I pull out the choke it runs
better. Any suggestions? Could the gas be bad? It's been in the car for
about 6 months.
From: greg at gelhar.com [mailto:greg at gelhar.com]
Sent: Sunday, July 06, 2014 7:51 PM
Cc: 'Randall'; triumphs at autox.team.net
Subject: Re: [TR] TR4A carburetors woes
A while back, I rebuilt the fuel pump on my TR6. I got to wondering why
with over a hundred horsepower powering the pump what kept it from
delivering sky high pressures. After I had it apart, I realized the
engine's cam only moves the pumps diaphragm to suck in fuel. It is the
spring on the diaphragm that pushes the fuel to the carbs. So no, I don't
think the pump can overpower the carb's float valves.
> Thanks for the input. I'm ordering the viton tip needle. My fuel pump is
> the stock mechanical pump. Can that put out to much pressure?
> -----Original Message-----
> From: Randall [mailto:TR3driver at ca.rr.com]
> Sent: Saturday, July 05, 2014 6:40 PM
> To: 'Jeff'; triumphs at autox.team.net
> Subject: RE: [TR] TR4A carburetors woes
>> When I take it for a spin though I can only get about 2
>> blocks and it starts
>> missing badly. I get it home and pull the plugs and they are
>> really sooty.
> Others will disagree, I'm sure. But my first step would be to replace the
> Grose Jets with the proper needle valves. I don't fully
> understand why, but I've fixed several cars with similar symptoms that
> Or if you happen to have an adjustable fuel pressure regulator installed,
> try turning it down a bit.
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