kaiser supersonic head |
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john jay
Member Joined: 08 June 2014 Location: n.e. oregon Status: Offline Points: 20 |
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Posted: 10 June 2014 at 6:15pm |
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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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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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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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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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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silverbullet72tnt
Member Joined: 20 Oct. 2010 Location: Littleton NH Status: Offline Points: 544 |
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ok, I went and got all the numbers I could. I didn't want to put them
into your data base, as I belive the block is not even close to
correct.....
Block number on side by starter 636953 w2 NI CR N2 Date is the non clock style 11-22 Has the small w/p boss with no numbers, they are on the side pad: 440-37-595 Oil pan flange numbers are 11 30 39 Not sure but I think the block is too old to be a replacement motor from the factory, I am guessing somebody got it out of an older willys car or something at some point in the jeeps life. If only the little guys could talk.... |
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sean
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Yes, but ya need more than just that. Check for everything listed here: http://www.thecj2apage.com/forums/another-engine-block-survey_topic18318.html |
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silverbullet72tnt
Member Joined: 20 Oct. 2010 Location: Littleton NH Status: Offline Points: 544 |
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No numbers on the waterpump boss. Would the numbers on the bottom starter side of the block help identify this? |
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sean
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Search for "supersonic": lots of prior discussion & photos
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silverbullet72tnt
Member Joined: 20 Oct. 2010 Location: Littleton NH Status: Offline Points: 544 |
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I bet I wouldn't either......
I just want to see the physical difference |
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rocnroll
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I'd be willing to bet you won't feel the difference in the seat of your pants.
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'47 CJ2A PU
'48 CJ2A Lefty "Common sense is not that common" |
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silverbullet72tnt
Member Joined: 20 Oct. 2010 Location: Littleton NH Status: Offline Points: 544 |
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Both of my motors came with them installed. My dads 51 M38 has a willys head. When we rebuild I am gonna check out the differences.....
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ralf
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I just put a Supersonic head that I picked up from a member on my 1945 MB block. looks good but have not started it. There is a difference in the combustion chambers.
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1947 CJ2A
1948 CJ2A 1953 Ford NAA Golden Jubilee Tractor 1941 J-3 Cub 1957 Farmall Cub Low Boy tractor 1942 Clarktor WW2 tug |
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DiverDownJames
Member Joined: 14 July 2011 Location: East Lansing MI Status: Offline Points: 538 |
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http://www.earlycj5.com/forums/showthread.php?7101-Kaiser-supersonic-head
7.5:1 Compression http://en.wikipedia.org/wiki/Willys_Go_Devil_engine 6.45:1 Compression for L-Head 4 So there would be some performance gained with a supersonic head. It could be a head swap from a jeepster, because I know some of them had supersonics. |
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samcj2a
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You'd think if Kaiser presumed to put a designation like that on the engine that they'd have done something different, but I'm no expert on those engines.
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DiverDownJames
Member Joined: 14 July 2011 Location: East Lansing MI Status: Offline Points: 538 |
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isn't the combustion chamber shaped differently for more HP, (about 5 I think)?
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samcj2a
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Kaiser built some cars in the 1950s, I believe, that used a version of the L-134 and had a cylinder head having Kaiser Supersonic cast on the head. I'm not sure if there was a functional difference. |
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Carlsjeep
Member Joined: 15 Jan. 2011 Location: Taylorsville Ky Status: Offline Points: 2642 |
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What is a Supersonic head?
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