Glowing Exhaust manifold
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Topic author
Glowing Exhaust manifold
I changed my 1915 model t over to a Z head. It began to knock on first start up. I shut her down as this happened on a friends 1925 Roadster on first start up. 2 identical start ups, 1 week apart. The exhaust manifold glowed between 2 and 3 cylinders. I changed her back to the original head and fired her up. No knock but the same glow occurred between 2 and 3 cylinders. I adjusted the mixture between lean and rich and settled on 1/2 way between; the remained. Any suggestions for a fix. Mark J
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- Posts: 1112
- Joined: Mon Jan 07, 2019 8:01 am
- First Name: Mark
- Last Name: Nunn
- * REQUIRED* Type and Year of Model Ts owned: 1926 Runabout
- Location: Bennington, NE
- MTFCA Number: 50321
- Board Member Since: 2017
Re: Glowing Exhaust manifold
When you installed the Z head, did you test the head by putting it on without a gasket and with loose bolts to check for interference between the pistons and head? Hand cranking would reveal interference by lifting the head slightly. There could be interference especially if your engine block has been decked and/or if your block has a large overbore. If that is a problem the combustion chambers can be ground for clearance.
I can't help from here with the glowing manifold. Are you certain that it was not glowing before the change? You may have an exhaust gasket leak.
FYI, if you post this question in the general discussion forum will get you many more responses and advice.
I can't help from here with the glowing manifold. Are you certain that it was not glowing before the change? You may have an exhaust gasket leak.
FYI, if you post this question in the general discussion forum will get you many more responses and advice.
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- Posts: 4967
- Joined: Sat Jan 05, 2019 1:57 pm
- First Name: Mark
- Last Name: Gregush
- * REQUIRED* Type and Year of Model Ts owned: 1925 cutdown PU, 1920 Dodge touring, 1948 F2 Ford flat head 6 pickup 3 speed
- Location: Portland Or
- MTFCA Number: 52564
- Board Member Since: 1999
Re: Glowing Exhaust manifold
Copy and repost on the general forum, this section is for problems with the site not car questions.
Last bumped by Anonymous on Mon Sep 28, 2020 10:50 pm.
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup