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In this Discussion
- 46HudsonPU April 2012
- 53jetman April 2012
- Kevin C. April 2012
- Ottobethere April 2012
Terraplane head
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What years do the 37 Terraplane head interchange to?
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If memory serves, I believe any 212 ci engine from 1937 thru 1947 head would be the same. The 175 ci heads will work, but you must be sure that they have not been plained because they would already give a boost in compression.
JerryJerry
email: HudsonJetman@mail.com
2nd Generation Hud-Nut
HET Tech Adviser on Hudson Jets 1953 & 1954
HET Registrar of all Hudson Jets -
The 175 ci head will boost the compression to 7.25 to 1. The 212 ci cylinder head is 6.50 to 1. The difference in horsepower is between heads is about 7 HP. This is if the head has not been resurfaced. When I went to rebuild the 212 I had to cut .0028 to get it straight. So I decided not to run the 7.25 to 1 cylinder head.
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What about the splasher heads that are marked with a compression ratio?
From previous threads (long ago, a bit hard to find), I seem to recall that optional, higher compression heads were offered by Hudson (boosted HP a bit). I have one of these - had pictures here on classiccar.com, however my 'archive photos' are all gone (?). I'll look when I get home, might have to take another picture... -
From what I remember, the heads for the 212's were 6.0
The 112's ('38 & '39) were 6.5 (112 was cast into the head)
The Traveler '40 was 7.0 (7.0 was cast into the head)
The Traveler '41 & '42 were 7.25 (7.25 was cast into the head)
Somewhere in this computer (but I've never been able to find) is a picture of a '37, a 112 and a Traveler 7.25 head setting next to each other. You can easily see the difference in the three heads!
I ran a 212 with a 7.25 head in my '39 for 5 years without any problems. The timing was set to factory specs and I never ran it hard.
Kevin C.
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Hi Kevin,
Here are a couple of photos -
The first one has '7 to 1' cast into the head, the second has '7.25 to 1' cast into the head. Click on the photos, they are a bit larger -
You might recognize the second one (engine still attached ;) ) - it's the engine I got from you that came out of that '39 you were speaking of. I'm holding onto this one, as a backup - in case "Plan A" for my '39 Hudson 112 pickup doesn't work out...
7to1 #2.JPG1920 x 1080 - 524K
7-25to1 #2.JPG1920 x 1080 - 538K
