GTC 374

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monkey135
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GTC 374

Post by monkey135 » Tue Sep 10, 2019 7:58 pm

A brief intro now I have it registered (was on Irish plates). Bought this in July, generally very pleased with it. Not sure if it is on the register?
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Got a carb question...... it's on a Weber 38dgas but doesn't run 'right'. 'Hunting' at idle and just doesn't pull right, bogs down. Already established the fuel jets are the wrong size but what does this do (circled in picture)? It's an open hole with nothing in it, should it have something connected?
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Regards,

Ian


Ian

'83 GTC

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guybetts
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Post by guybetts » Tue Sep 10, 2019 9:39 pm

Hi Ian,
Welcome to GTC ownership.
I took a few pics of the GTC's at Curborough in order to record cars there and check against the register. I spotted yours which wasn't on the register with the registration number (obviously now), but I didn't see you :(
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JBW998Y
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At least now I know which GTC it is :D and it is on the register.

Please can you pm me or drop me an email gtc.registrar@rssoc.co.uk with your details, so I can update the register.

As to your Weber Carb issue, I'll leave that to someone with better technical knowledge... someone will probably be along soon enough :)

Thanks,
Guy


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1966 Straight Six Coupe, 1981 GTC
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scimjim
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Post by scimjim » Tue Sep 10, 2019 10:20 pm

Is it an open hole, or an undrilled boss?


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Post by ard126k » Wed Sep 11, 2019 5:37 pm

I think they all have that, don't they? Must be for some other application.
Where did you find the jet sizes for a 2.8? I've only ever seen them for 3.0 Essexes?
Alex.


1971 SE5 1977 SE6 1982 GTC

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Geraint SabreGTCse5
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Post by Geraint SabreGTCse5 » Wed Sep 11, 2019 5:53 pm

ard126k wrote:
Wed Sep 11, 2019 5:37 pm
I think they all have that, don't they? Must be for some other application.
Where did you find the jet sizes for a 2.8? I've only ever seen them for 3.0 Essexes?
Alex.
the receipt for rejetting a dgas fitted to one of my c's gives the following spec Main jet 142 Air jet 185 idle jet 5.... it was done some time ago but new dgas carbs can be bought for the 2.8


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monkey135
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Post by monkey135 » Wed Sep 11, 2019 7:30 pm

Main jets are currently 135 so I bought some 145's as I read somewhere that was correct. The hole I referred to is open (i.e. not just an undrilled boss) but a couple of people have now confirmed it's the same so I guess that's not the issue.

There are a few pipes blanked off with bolts in the end of rubber pipes (mainly what I assume are vacuum pipes into the manifold/base of the carb). See in picture below. I have a carb rebuild kit so intend to take it off this weekend and have a good look over. What is the general view on best way to blank off unwanted vacuum's, is it as shown?
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Thanks for help.

Ian


Ian

'83 GTC

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Post by ard126k » Thu Sep 12, 2019 7:58 pm

I'm not sure if 4mm is the correct size but something like this would do.
https://www.ebay.co.uk/itm/4mm-End-Caps ... LhZGgNscGw


1971 SE5 1977 SE6 1982 GTC

monkey135
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GTC 374

Post by monkey135 » Sat Sep 14, 2019 1:31 pm

Hi, so I got the carb off and I have a question on the spacers at the base. There are 3 spacers/plates (in first picture right to left = carb to manifold) all with gaskets on both sides apart form the last one which sits directly on what appears to be a plastic type thick spacer (2nd photo) still on the manifold. So that's 3 gaskets.
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First question, my rebuild kit (genuine weber) only has 2 gaskets and they are different. One big hole (right below) instead of 2 small (left below). Is this correct and do I need one more like this or 3 like original?
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Second question, the last plate has a 'peaked' region at the rear pointing up (some kind or restrictor/deflector), in my head this peak would be better pointing down given the air flow direction (or being removed altogether). Does anyone know which way round it should be? This could explain why it struggles at higher rpm or I could be completely wrong.
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Any help massively appreciated, keen to get it together and back on before the sun disappears the winter.

Ian


Ian

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Post by ard126k » Mon Sep 16, 2019 5:48 pm

Can't help with the gaskets but the GTC parts book has a drawing which seems to show the 'peaks' downwards. But it's partly hidden and not very clear.


1971 SE5 1977 SE6 1982 GTC

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