kaiser supersonic head |
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silverbullet72tnt
Member Joined: 20 Oct. 2010 Location: Littleton NH Status: Offline Points: 544 |
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Also interesting to note: My 3A has both a supersonic head and block, I noticed a small tag under the distributor that has a barely legible "supersonic" on it...
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Insert some clever signature here...
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sean
Moderator Group Sponsor Member Joined: 20 July 2005 Location: North Idaho Status: Offline Points: 7388 |
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1940 Willys civilian model "440" engine. Engine machined/assembled on Nov. 30, 1939. These are occasionally found installed as replacement engines (not factory, the PO just found a used engine to put in, rather than overhaul the original). Go ahead and put it in the database. The database is for what you "found" in your rig. Thanks! Sean
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john jay
Member Joined: 08 June 2014 Location: n.e. oregon Status: Offline Points: 20 |
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friends:
i am a newbie. just acquired a '48 willys, w/ a supersonic head from kaiser. (serial no. 741422, ... , must have made several of them, eh?) i wrote to inquire about it, posted at a place i wasn't supposed to. "read the notice," a subsequent (private) letter said, to spare me the embarrassment of publicly telling me i'd messed up, and they replaced the post in a general "discussion" page. anyhow, a person came on and told me that the numbers "6410" in the casting numbers indicated a latter date replacement motor for my '48 from willys, and that the supersonic head was didn't start manufacture until the 1950's, perhaps 1953, and from kaiser. it is indeed a "performance" head, by the simple expedient of shaving about 1/8" from the bottom, and therefore decreasing the combustion chamber and raising the compression ratio from 6.48 to 1, to slight above 7 to 1. this added about 5 horsepower, a not inconsiderable amount in a 60 base horsepower motor. (this i read somewhere else, and somewhere else they have pictures of the resultant size and shape of the combustion chamber. i don't have the link, though i saved it somewhere.) so, i have a replacement motor from willys, with a head from kaiser post-1953 manufacture. neat. cool, even. this is a very informative blog, and i like it. john jay
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john jay
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Mike S
Member Joined: 20 May 2006 Location: West Coast Status: Offline Points: 2318 |
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You can effect the same change in compression by shaving your head and/or decking the block. I have a shaved head on my '47 and a spare that is 'factory'. I think the best way to indicate a difference in compression is to 'cc' the combustion chambers. My shaved head has, I think, 72cc chambers. I will have to double check the numbers.
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'47 CJ2A -- #114542
Warn FF D41 rear Lock-Right locker 11" drum brakes Dual master cylinder T90C Transmission 16 X 6 Jeep truck wheels Cooper STT Pro tires |
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john jay
Member Joined: 08 June 2014 Location: n.e. oregon Status: Offline Points: 20 |
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mike s:
i think kaiser took a little off the bottom of the head, and added a little to the top, to make up for it structurally. at least, that is how the people who have commented about this (at other chats) described the raised ribs on top of the kaiser block, e.g., to lend strength for the increase in compression. i never in my wildest dreams ever thought that a "simple little flathead" motor could have so many permutations. it is all very interesting, to say the least. |
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john jay
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