Part 65. More work on the exhaust system.

We did some more work on the exhaust system. The front expansion chamber was made earlier and modified for twin exhaust pipes according to the Haynes manual. The next job is to modify the rear silencer for the twin pipes.

Here’s a picture of an original two stroke rear silencer:

exhaust
There are perforated walls at both ends of the expansion chamber. Behind the walls is some wool for silencing effect (I’d presume it’s for reducing resonance).

Here’ another view:
exhaust3

But, as it turned out, our cheap V4 rear silencer is constructed a bit differently: There’s no perforated walls at the ends and no wool:
exhaust4

This makes the modification easier – we just removed the endcap with the single pipe:
exhaust5

And constructed an endcap with twin pipes:
exhaust6

exhaust7

I think I will drill a few extra holes to increase flow (location indicated by the red dots in the next photo).
extraholes
I bet the exhaust sound will not be very quiet…

I did a little work on the heating system also. The original heater valve was shot, so we bought a new one – a generic model (there are some original valves available they cost a bit too much).

valve

Attaching the new valve was not that straightforward since the construction is completely different from the original.

I closed off the hole in the firewall for the original valve:
valve2

And made a bracket to hold the new valve – I’ll paint it black later…
valve4

One thought on “Part 65. More work on the exhaust system.”

  1. Wonderful, you guy’s are making a fantastic, quality job on the old stroker…Well done and thanks for the great website. I own a ’62’ Bullnose 96 RHD and your documented story, gives me encouragement to work on mine.

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