Heat Riser
Le Mans Master
Joined: Dec 2004
Posts: 5,394
Likes: 2,767
From: Pittsburgh
2024 C2 of the Year Finalist - Modified
2023 C2 of the Year Finalist - Modified
2022 C2 of the Year Finalist - Unmodified
2019 C1 of Year Finalist (appearance mods)
Just make curtain that it pivots open and closed freely. When heated, the external spring heats and weakens causing the external counterweight to drop opening the internal plate to let exhaust freely flow through the side or under exhaust system. Be sure to check for free movement (pivoting). If seized close, noticable performance issues will prevail..... Trust me!
Mine was relatively seized. I bought a spacer and removed mine on my 65 Coupe. If removed, this WILL create a "Worming up" Issue in colder climates.
Others will chime in...........
Mine was relatively seized. I bought a spacer and removed mine on my 65 Coupe. If removed, this WILL create a "Worming up" Issue in colder climates.
Others will chime in...........
Last edited by dcamick; May 12, 2021 at 11:23 AM.
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,270
2. On a cold engine move move counterweight 90 degrees to the open position.
3. Wrap two turns of wire around counterweight and manifold in such a way to hold the valve open.
Duke
Team Owner
Joined: Jul 2006
Posts: 22,163
Likes: 4,171
From: Kannapolis NC
Pull it down as far as it goes (not quite straight down) and tie it down with wire. That's the quick inexpensive way to eliminate the riser function. If you like the way it goes without it, you can always remove it and replace it with the spacer.
Drifting
Joined: Dec 2006
Posts: 1,946
Likes: 405
From: Bronx New York
Easier to just wire it open as described. Did it ten years ago. Easier hot starts due to less fuel percolation in the carb bowls and no popping sounds out of the RH exhaust manifold are the expected benefits. Choke may take longer to kick off in very cold weather but I dont drive it in the winter.
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