The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Exhaust Ports
PostPosted: Wed May 30, 2012 8:43 pm 
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Location: Winscombe, North Somerset, England
So I've just got my head back from the machine shop. On closer inspection I see these scallops/chunks/dents in the exhaust ports (one in every port)...

Image

Now I never noticed them before because of the carbon coating the ports. Straight away I thought "that's odd, they shouldn't be there" so I checked with a couple of old heads I have and they don't have them.

I can't see these enhancing the flow of the exhaust gases out of the head!

BTW, the machine shop didn't make them they must have been there already.

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1997 TVR Chimaera 450


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 Post subject: Re: Exhaust Ports
PostPosted: Thu May 31, 2012 1:21 pm 
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I suppose I will have to fill them with something like this...

Image

...then get the dremel on it. Not ideal but needs must.

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Sprintless for the first time in 35+ years. :boggle2: ... Still Sprintless.

Engines, Gearboxes, Overdrives etc. rebuilt. PM me.


1997 TVR Chimaera 450


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 Post subject: Re: Exhaust Ports
PostPosted: Thu May 31, 2012 2:33 pm 
^Brilliant stuff! Used it to fix the carb float on my bike. The satisfied customer quotes on the back are great too.


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 Post subject: Re: Exhaust Ports
PostPosted: Fri Jun 01, 2012 1:17 am 
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I wouldn't mind and do nothing about it.

Jeroen

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 Post subject: Re: Exhaust Ports
PostPosted: Mon Jun 18, 2012 9:01 pm 
Leave them, it is not important to have a perfectly smooth surface as it is on the inlets.


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 Post subject: Re: Exhaust Ports
PostPosted: Wed Jun 20, 2012 11:57 pm 
As far I know it was ment to use airinjection, but it never came that far.
You even can see it on the picture, the flat earea above the ports can be machined to take air lines.
Take an USA MGB as example.

Honda call it a PAR cystem, usa versions do have the air lines, Euro versions not.

Hans


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