Ians GTC rebuild. Now she runs, and stops.

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GTC Ian
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Ians GTC rebuild. Now she runs, and stops.

Post by GTC Ian » Tue Jul 16, 2019 8:25 am

Having sorted the brakes out and with thoughts of an MOT test getting closer, problems arose setting up the carb along with a badly fitting rotor arm. Its running very rich but I cannot cure the fault.Also I can get the car to tick over, and when I put it in gear it stalls (its an auto box). I increased the revs to 1500, put in gear and fine. Drove it down the road and back, smooth gear change etc and all gears working. Turned the revs down and it cuts out. Cleaned out carb ( I had a service kit for it) apart from crap in the float bowl, nothing else jumped out. So its back to the drawing board. It will have to take a back seat for a day or 2 as the SS1 will need getting ready for Silverstone next week and the caravan will need loading.


White GTC no 91 (Now getting the TLC it justly deserves)
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AJL Electronics
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Ians GTC rebuild. Now she runs, and stops.

Post by AJL Electronics » Tue Jul 16, 2019 9:22 am

GTC Ian wrote:
Tue Jul 16, 2019 8:25 am
Having sorted the brakes out and with thoughts of an MOT test getting closer, problems arose setting up the carb along with a badly fitting rotor arm. Its running very rich but I cannot cure the fault.
Rich running through the range is caused by the float level being too high. Either it is maladjusted or the fuel pressure is forcing the needle valve off its seat. Rich at idle will be either the wrong jets (should be 0.45 in a Weber) or emulsion tube blocked or wrong. Is it rich both banks? How far will the CO go down?


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GTC Ian
RSSOC Member
Posts: 396
Joined: Fri Jun 24, 2011 10:50 am
Location: Whittlesey Cambs
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Ians GTC rebuild. Now she runs, and stops.

Post by GTC Ian » Tue Jul 16, 2019 11:19 am

AJL Electronics wrote:
Tue Jul 16, 2019 9:22 am
Is it rich both banks?
Yes its rich on both banks. No idea about the CO. The carb was working fine before the rebuild started.Mpg was good. Ive not re-jetted it as the carb was brand new when I bought it. But I will check the float level


White GTC no 91 (Now getting the TLC it justly deserves)
Personal mechanic to Barbara's SS1
Previous SE5a JKG 236N (R.I.P)
Members since 1984

GTC Ian
RSSOC Member
Posts: 396
Joined: Fri Jun 24, 2011 10:50 am
Location: Whittlesey Cambs
Has thanked: 12 times
Been thanked: 5 times

Ians GTC rebuild. Now she runs, and stops.

Post by GTC Ian » Mon Aug 05, 2019 7:20 pm

After a break for getting Barbaras SS1 ready for Silverstone the 'C' kinda took a back seat. Further examination revealed a couple of potential causes. The power valve diaphram looked a bit iffy and when I put the carb on the surface table it revealed a bow of .3mm in the base. No way the gaskets would compensate for that.So a new power valve fitted and I machined the carb base.
Fitted back on the car and there was an improvement, but still having problems setting the idle. So Im just waiting for a selection of idle and main jets to arrive from Fast Road cars.
Sadly it means the car will not be at Curborough this year. Sorry Guy.
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White GTC no 91 (Now getting the TLC it justly deserves)
Personal mechanic to Barbara's SS1
Previous SE5a JKG 236N (R.I.P)
Members since 1984

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guybetts
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Ians GTC rebuild. Now she runs, and stops.

Post by guybetts » Mon Aug 05, 2019 8:15 pm

GTC Ian wrote:
Mon Aug 05, 2019 7:20 pm
Sadly it means the car will not be at Curborough this year. Sorry Guy.
That's a shame, but better that it's running well than causing any further issue. Still there's next year... which should be a big birthday for the GTC :D

It's touch and go whether mine will make Curbs too, as it may be needing some engine tlc. I'll be there though.


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1966 Straight Six Coupe, 1981 GTC
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