Hot Spot Connector. : MGC Forum : The MG Experience

Hot Spot Connector. #1
scarruth1 Sam Carruthers Newtown Abbey, Northern Ireland, UK Sign in to contact 1960 MG MGA 1600 Coupe 1980 MG MGB Limited Edition (LE) "Ric"	Topic Creator (OP) Oct 25, 2014 02:37 PM Joined 10 years ago 32 Posts

I am currently re-assembling my MGC Roadster after a major strip down. About 90% of the way there but as usual, at least for me, I find things which I don't recall removing and vice versa. I have bolted the intake manifold on to the car and noticed there are four screws loosely fitted on the underside of it. When I check parts list it would appear that the bolts are for a holding a 'hot spot connector' front and rear. These I do not have can someone tell me what they are for and if I need them?

Thanks.

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Re: Hot Spot Connector. #2
kirks-auto Robert Kirk (RIP) Davenport, IA, USA Sign in to contact	Oct 25, 2014 03:02 PM Top Contributor Joined 15 years ago 21,573 Posts

This indicates a NA spec car. Do you have single or dual brake systems...front and rear two feeds?

Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match most retail/delivered quote

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Re: Hot Spot Connector. #3
scarruth1 Sam Carruthers Newtown Abbey, Northern Ireland, UK Sign in to contact 1960 MG MGA 1600 Coupe 1980 MG MGB Limited Edition (LE) "Ric"	Topic Creator (OP) Oct 25, 2014 03:12 PM Joined 10 years ago 32 Posts

Hi Robert,

I believe it is a single braking system. The car is a UK spec car but may well have had the intake manifold from another vehicle?

Regards

Sam

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Re: Hot Spot Connector. #4
maartenl Maarten L Den Haag, Zuid-Holland, Netherlands Sign in to contact	Oct 25, 2014 04:24 PM Joined 10 years ago 234 Posts

I have UK/EU manifolding, which should be connected through your 'hot spot connector'. I bought inlet and outlet separate (my us manifolds developed a crack at the hot spot), two purchases. Never bothered connected inlet and outlet, still running/waiting for the inlet to fall off (have spares). No cold running issues (even in winter).

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Re: Hot Spot Connector. #5
kirks-auto Robert Kirk (RIP) Davenport, IA, USA Sign in to contact	Oct 27, 2014 07:01 AM Top Contributor Joined 15 years ago 21,573 Posts

I am under the impression only NA spec cars got the shared hot air style manifolds. I stock the hot spot gaskets but it really begs other issues I believe. I am not an expert on EU nor UK spec cars but the manifolds are most different than NA, as with the carbs and air cleaner. NA spec is considered a better set up and as indicated I have the gaskets and they weigh only a few ounces for shipping purposes.

Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match most retail/delivered quote

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Re: Hot Spot Connector. #6
scarruth1 Sam Carruthers Newtown Abbey, Northern Ireland, UK Sign in to contact 1960 MG MGA 1600 Coupe 1980 MG MGB Limited Edition (LE) "Ric"	Topic Creator (OP) Oct 29, 2014 02:17 PM Joined 10 years ago 32 Posts

As you folks stated that the 'hot spot connector' was only on US cars.

Whilst the four tapped holes are on my manifold the hot spot connector has never been fitted.

Thanks for your comments etc.

Sam

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Re: Hot Spot Connector. #7
BAHAMIAN C Dave Burley Roscommon, Up North Michigan, USA Sign in to contact	Oct 29, 2014 06:52 PM Joined 12 years ago 465 Posts

Sam-

Actually, It was the U.S. cars that did NOT have the "hot spot connectors". Hot spot connectors were originally on 29G (Home Mkt and non-emissions) and 29GB (France) and 29AA / 29AB (Austin 3-Litre / France) engines.

U.S. cars, actually have open ports in the exhaust manifolds that require gaskets to connect to the intake manifolds.

In the diagram below, #17 and #18 are your hot spot connectors, and #8 and #9 are intake manifolds for 29G engines, and #8a and#9a are Austin 3-Litre. Note that #10 and #11 are U.S. manifolds.

Hope this helps-

Dave

scan0003.pdf 67.5 KB

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Re: Hot Spot Connector. #8
maartenl Maarten L Den Haag, Zuid-Holland, Netherlands Sign in to contact	Oct 30, 2014 04:06 AM Joined 10 years ago 234 Posts

The "hot spot connector", on log style manifolds, is just a piece of aluminium. Never take the assembly apart, because the bolts for sure will brake. If you do, I would skip the connectors, nobody will know. Just a bit of old skool MG over engineering.

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Re: Hot Spot Connector. #9
kirks-auto Robert Kirk (RIP) Davenport, IA, USA Sign in to contact	Oct 30, 2014 07:53 AM Top Contributor Joined 15 years ago 21,573 Posts

In reply to # 2838087 by maartenl The "hot spot connector", on log style manifolds, is just a piece of aluminium.

Good to know!

Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match most retail/delivered quote

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Re: Hot Spot Connector. #10
simon58gladiator Simon Wilkinson Colne Classics, Colchester, UK Sign in to contact 1966 MG MGB "Harvey" 1967 Jaguar Mark 2 1969 MG MGC "Maisie" 1969 MG MGC "The Beast" & more	Oct 30, 2014 10:38 AM Joined 13 years ago 683 Posts

I will post a pic of UK spec units tomorrow. I think they are needed to give the support to the alloy inlet manifold.

Colne Classics www.colneclassics.com

Suppliers of MGC floor pans, torsion bar panels, drain covers, wing reinforcers, engine restraint brackets, radiator brackets, servo pipes, swan neck fillers. I also have a store of parts if you are missing anything from your MGC.

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Re: Hot Spot Connector. #11
scarruth1 Sam Carruthers Newtown Abbey, Northern Ireland, UK Sign in to contact 1960 MG MGA 1600 Coupe 1980 MG MGB Limited Edition (LE) "Ric"	Topic Creator (OP) Oct 30, 2014 04:03 PM Joined 10 years ago 32 Posts

This topic has attracted a lot of comments which I appreciate. Perhaps the pics which Simon says he will post tomorrow will shed some more light on the subject because at the moment I am not sure if the connectors should be fitted to my UK manifold or not. The 'Owners Club' suggested that UK manifolds did not have them fitted only NA. Th explanation given for the connector was to evaporate any fuel that dropped out of the air stream so it was burnt on the engine?

Regards

Sam

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Re: Hot Spot Connector. #12
BAHAMIAN C Dave Burley Roscommon, Up North Michigan, USA Sign in to contact	Oct 30, 2014 06:16 PM Joined 12 years ago 465 Posts

Sam-

The diagram (scanned from an original "Service Parts List"- AKD 5102) that I posted above, should verify that "Owners Club" is not a very reliable source of information! eye rolling smiley

As can be easily seen, the UK manifolds are at the top of the page (with hot spot connectors), and U.S. spec. manifolds are at the bottom of the page (gaskets- no hot spot connectors)

As Simon stated above, they probably add needed support to the intake manifold, in addition to creating a "hot spot" to evaporate any pooled fuel confused smiley

laying on the bottom of the intake manifold. So, if you have them, put 'em on. smoking smiley

For what it's worth-

Dave

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Re: Hot Spot Connector. #13
simon58gladiator Simon Wilkinson Colne Classics, Colchester, UK Sign in to contact 1966 MG MGB "Harvey" 1967 Jaguar Mark 2 1969 MG MGC "Maisie" 1969 MG MGC "The Beast" & more	Oct 31, 2014 03:29 AM Joined 13 years ago 683 Posts

UK hot spot connectors. This set is for sale if you want them Sam.
Simon.

Colne Classics www.colneclassics.com

Suppliers of MGC floor pans, torsion bar panels, drain covers, wing reinforcers, engine restraint brackets, radiator brackets, servo pipes, swan neck fillers. I also have a store of parts if you are missing anything from your MGC.

image.jpg 29.5 KB

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Re: Hot Spot Connector. #14
scarruth1 Sam Carruthers Newtown Abbey, Northern Ireland, UK Sign in to contact 1960 MG MGA 1600 Coupe 1980 MG MGB Limited Edition (LE) "Ric"	Topic Creator (OP) Nov 2, 2014 09:54 AM Joined 10 years ago 32 Posts

Simon,

Yes i would be interested I have sent you a pm.

Regards

Sam

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Re: Hot Spot Connector. #15
scarruth1 Sam Carruthers Newtown Abbey, Northern Ireland, UK Sign in to contact 1960 MG MGA 1600 Coupe 1980 MG MGB Limited Edition (LE) "Ric"	Topic Creator (OP) Nov 2, 2014 10:01 AM Joined 10 years ago 32 Posts

Dave/Simon,

Thanks for your comments. Today I went and looked at an MG C GT which is owned by a friend of mine. It has the hot spot connectors fitted. At last I know now how they are fitted and would agree with Simon's comments re support to the intake manifold. If I can obtain a set I will fit them. By the way I also noticed on my car that there is a 'drain' connection at the end of the intake manifold with a very small diameter pipe connected to it. Is it a drain and just left open to the atmosphere?

Thanks to all.

Sam

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