Tom Wesenberg
Well-known member
Correct........I have a compressor head and that's exactly how it works.
BTW, in the first picture of this thread, what is the yellow by the oil fill pipe?
Was the block cracked and brazed?
weird crankshaft
- Thread starter larry harding
- Start date
Correct........I have a compressor head and that's exactly how it works.
BTW, in the first picture of this thread, what is the yellow by the oil fill pipe?
Was the block cracked and brazed?
Tom Wesenberg
Well-known member
OK, now to add to the mystery of the crank, I just looked at my NOS camshaft and compared the positions of lobes 2 and 6 with those in the first picture of the first post, and both cams are the same. So, in other words, this engine couldn't have run on two of the cylinders with the crank throws being turned 90 degrees for 2 cylinders.
Chris Haynes
Well-known member
So tell me more about this museum. Name? Location? ETC.
hardtimes
Well-known member
I put the card away. Will get tomorrow and give details.
Richard Johnson is a member of the board of directors. I met him years ago while attending the yearly San Antonio Boys Home Charity swap/car meet. What a nice guy and Model A man ! I think that he also heads up the Simi Valley Model A Club, as he has invited me and ZZlegend to attend monthly meeting. He's a good recruiter, I think
!Anyway, Richard has this '31 Model A coupe...beautiful ! You cannot help but notice the BIG tires on the rear...hm...why ?
He opened the hood and there was this GEMSA OHV Donovan engine
!! Yeah, he has plenty of other stock As, but he is a cool old guy.Will go to breakfast meeting ....just to show that Valley boys are sociable, if not joiners
larry harding
Senior Member
the "a" guy i went to see yesterday has an air compressor with an a engine. it looks like it has three heads, #1 and 4 do the running while 2 and 3 do the compressing. i'm pretty sure it would use a stock crank, not the frankenstein i have. i think he used it when sand blasting. it is a neat looking set up, but i didn't notice the brand name on it.
now where can i get a good crank?
now where can i get a good crank?
Steven Ryan
Junior Member
Please tell us about the block, is a 'diamond' type? Is there anything different with the block? In the only picture you posted, the oil pump boss looks raised.
larry harding
Senior Member
,the only thing i noticed is there is a hole with a diamond shaped patch over it held in place with two bolts at the front and back of the block. they are located just below the head and pretty much inline with the valves and ports. i have no idea what purpose they could have served. the eng.# isa1126683 i don't know what is meant by "diamond type".
Richard Lorenz
Senior Member
I have a similar odd crankshaft somewhere in my collection. I bought it as a loose crankshaft, but the seller did not know what it came from. It was Model A in every respect except for the unusual "rotation" of the pistons.
I will look for the crank and report on the exact situation when I find it.
I will look for the crank and report on the exact situation when I find it.
Jim Brierley
Well-known member
The Winfield 2-up-2-down engine had the 2 front cylinders up while the rears were down. This was to even the pulses in the ports. Ed said it did run rough but smoothed out at high speeds.
I don't think so, a reverse rotation engine based on the Model A which has a two gear camshaft drive would need a reverse ground cam and the distributor drive gear would need to be corrected too but the crank would remain the same.
George Miller
Well-known member
There is a way, use a timing chain if it has gears. If it has a chain use timing gears, then every ting will work if you run it backwards.
hardtimes
Well-known member
Hey Larry,
I have a spare B crank(not counterbalanced), but you are so far east from the left coast...shipping might injure your psychic situation, eh
hardtimes
Well-known member
Hey Chris,
Name:
Simi Valley Historical Society & Museum
Strathaern Historical Park (805) 526-6453
137 Strathearn Place, Simi Valley Ca
Richard Johnson (805) 520-7433: mechanical restorations
Very busy and large place. They even have a 'barn' that is used for weddings, etc throughout year and booked up (I'm told) for two years !
hardtimes
Well-known member
Hey Larry,
diamond type...IMO, refers to the cast in 'diamond' shape to the upper right front of the block.....on replacement/after market blocks.
larry harding
Senior Member
i did a little more inspecting and hope by playing with shims maybe the good(at least better) crank i have may be made to work. if so maybe i can get some use from this engine. i'll see how far i get tomorrow.