Author Topic: Vintage Jeep Engine Blocks Now Available!  (Read 1285 times)

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Offline Jeffy

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Vintage Jeep Engine Blocks Now Available!
« on: September 01, 2016, 07:29:09 PM »


Rick Péwé
Editor-in-Chief, 4Wheel & Off-Road
Photographers: John Lampl

Truth be told, old flathead Jeep engines are getting hard to find. And since the Willys four-cylinder flathead is the heart of the Jeep, it only makes sense to make new blocks available. At least that’s what John Lampl figured when he was rebuilding his old Jeep and found that the engine block was cracked. In some cases, a cracked block can be fixed, but other times, it’s just not cost effective or reliable. In fact, the supply of good used core engines are so slim that John’s machinist stated the he “could use 20 a month” if they were available. That got John thinking about reproducing the Go Devil engine block so he and other enthusiasts could have a cost-effective alternative.

John’s background is in manufacturing and marketing, and much of his experience came from the overseas companies that do quality work for major car manufacturers. He set out on a fact finding mission to see if an engine block could be produced in the US or abroad, and what it would entail. While not a machinist himself, John worked with many of the right people to figure out how to get this project done. He found that while anything could be built in the US, the cost effectiveness would not be there, even at high quantities of production. In the United States, many of the smaller foundries found they could not compete with the large industrial makers who use more cost-saving automated processes. The downside of this that the large American foundries/factories have put the “Moms & Pops” out of business and cannot serve the lower-quantity demands of the vintage markets like for the old Go Devil. The sad fact is that we have lost manufacturing diversity to other countries, and to get what we want at the price we want to pay, we have to reach out to other countries that still have those resources. In addition, while these new blocks are made in China, it’s the quality side of that equation that results in a good product. The Chinese manufacturing base is much like that of America in the ’40s and ’50s as far as a great diversity of resources. The upside is that all of these little factories and foundries are using 21st century technology in production. For example, John’s machining operation is using automated CAD CNC machining with tolerances exceeding .0005 inches—far more precise and exceeding the tolerances of American-made ’40s Willys engines. It’s the best of both worlds.

First, John found a foundry willing to produce the small quantities of blocks he envisioned; this isn’t a 10,000 unit production run - at least not yet. Then he had to find the right machining company to precisely CNC machine the castings to his exacting specifications, and also guarantee the repeatability. With the groundwork laid and a business plan made, John took some old blocks over to the foundry to completely map them on a Coordinate Measuring Machine (CMM) and create a 3-D drawing in Solid Works to begin the process. The CMM John’s factory used can measure up to 1.5 micrometers in accuracy (0.000059”). Fortunately John had some in-house help, his daughter Sunnie, a recent graduate of MIT with a mechanical engineering degree was there to look at the design process and advise him throughout the course of development.



In effect, they reverse engineered a ’52 CJ-3A engine block and set it up as such. Instead of using a green sand casting as the original blocks were made, they used the investment cast method for more structural integrity and durability, as well as surface finish and machining surfaces, even though it is more expensive. In addition, the new grey iron blocks have a higher content of chromium and copper for added strength and durability over the original design. He also had them tested by SGS, as well as having his own machinist measure, check, and build the first test units.

Fortunately for the hobby, John reports that, after building an engine with the new block, then installing it in his CJ-5, it is up and running and passing all the tests, Of course, final price to the retail buyer will depend on how many units he can produce and sell, but for now, we believe it will be very affordable for a ready-to-go block. Merlin Hanson of Hanson Mechanical Restoration is working with John and is responsible for bringing the block to the market and to distribution. Merlin is well known in the vintage Jeep world and was the first to post about these new blocks on hansonmechanical.wordpress.com. It immediately created quite the stir, as this has been the one important item that hasn’t been reproduced for Jeeps, while bodies, frames, and most other parts have been. As the project continues, we will be at the forefront bringing you the latest details of the greatest Jeep engine ever produced: the Willys Go Devil!

<a href="http://www.youtube.com/v/6q6gtDyMaRI" target="_blank" rel="noopener noreferrer" class="bbc_link bbc_flash_disabled new_win">http://www.youtube.com/v/6q6gtDyMaRI</a>
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline neale_rs

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Re: Vintage Jeep Engine Blocks Now Available!
« Reply #1 on: September 02, 2016, 07:57:18 AM »
This is good news for the old Jeeps.
'95 YJ, 33 x 12.5 BFG MTs, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline chardrc

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Re: Vintage Jeep Engine Blocks Now Available!
« Reply #2 on: September 04, 2016, 07:13:16 PM »
very interesting. It is getting really hard to find serviceable go-devil engines around here for a decent price. Not sure why you would put a flat head in a cj5 when cj5s did not come with them to my knowledge (had to be some changes to make the F-head block). hopefully we don't end up needing to use one of these on our Willys but good to know there are more options now.
1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

Offline Jeffy

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Re: Vintage Jeep Engine Blocks Now Available!
« Reply #3 on: September 04, 2016, 09:35:19 PM »
very interesting. It is getting really hard to find serviceable go-devil engines around here for a decent price. Not sure why you would put a flat head in a cj5 when cj5s did not come with them to my knowledge (had to be some changes to make the F-head block). hopefully we don't end up needing to use one of these on our Willys but good to know there are more options now.
Actually, the F134 was offered in the CJ-5 and CJ-6 from 1951 to 1971  It was also found in the military counter-part M38A1.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline neale_rs

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Re: Vintage Jeep Engine Blocks Now Available!
« Reply #4 on: September 05, 2016, 11:07:10 AM »
I sounds like the L-head is the one getting very scarce. Maybe the F-heads are still more available.
'95 YJ, 33 x 12.5 BFG MTs, RE 4.5 ED lift, Atlas 4 speed, rear D44, ARBs front and rear, 4.56 gears, 8000# winch

Offline chardrc

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Re: Vintage Jeep Engine Blocks Now Available!
« Reply #5 on: September 09, 2016, 06:31:19 PM »
Actually, the F134 was offered in the CJ-5 and CJ-6 from 1951 to 1971  It was also found in the military counter-part M38A1.

The F head was the over head intake valve, exhaust in the block 134 ci engine (reason for the higher hood on the cj5&6). the video shows the block used as an L134. I know the F head block is based on the L134 block but i doubt they are fully inter changeable.  So as I was trying to say it doesn't make send to put a L134 flat head into a cj5 or cj6...  :digdeeper:
1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

Offline Jeffy

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Re: Vintage Jeep Engine Blocks Now Available!
« Reply #6 on: September 10, 2016, 02:00:48 PM »
Ah, I see what you're getting at.  You can swap an F-head onto a L134 block but it does require some machining IIRC.  The ports all back up but the head bolts don't.  I think there are some other minor internal differences as well that can br overcome as well.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."