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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1195
Registered: 11-2001
| | Posted on Wednesday, August 30, 2006 - 11:29 pm: | 
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J.B.'s new find!
1.Mohawk
2.Mohawk
3.1912 AD
4.Intake
5.Intake 2
6.Port 1
7.Port 2
8.Port 3
9.Port 4
10.Air Bypass
11.Transfer Port
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keith
Senior Member
Username: keith
Post Number: 137
Registered: 02-2002
| | Posted on Thursday, August 31, 2006 - 07:59 am: |
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From a Mohawk Catalogue.
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 161
Registered: 07-2002
| | Posted on Thursday, August 31, 2006 - 08:46 am: |
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Thanks Richard & Keith. I found this engine at the Portland show. Looking at it I could tell it was a three port, but it also had a check valve. This is my first look at a 2-3 port. The intake is split, the valved section feeds the bottom port, the top port is direct from the carb. The piston has a slot which uncovers the port, but it continues up untill the bottom of the piston uncovers the port also. The transfer port is controlled at the top and bottom by the piston, and there is a cross port from the intake side of the cylinder to the transfer port. This can be seen in the top lh corner of picture 11, and top rh corner of picture 9. This port would allow air charge to enter the crankcase through the bottom of the transfer port when the piston is up, but when the piston is down and the cylinder is being charged there is nothing to stop the charge from going back to the carb. The air bypass can be seen on the carb portion of the manifold, it is controlled by one of the levers, the other going to the carb butterfly. |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1196
Registered: 11-2001
| | Posted on Thursday, August 31, 2006 - 10:19 am: |
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Keith
Is there a date on the catalog ?? |
keith
Senior Member
Username: keith
Post Number: 138
Registered: 02-2002
| | Posted on Thursday, August 31, 2006 - 01:01 pm: |
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No Richard.
Although there is a "Certificate of Guarantee" on the first page that allows for info about the motor to be filled in, and it has 191___ , so it would be in the teens. |
keith
Senior Member
Username: keith
Post Number: 139
Registered: 02-2002
| | Posted on Friday, September 01, 2006 - 10:17 am: |
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keith
Senior Member
Username: keith
Post Number: 141
Registered: 02-2002
| | Posted on Friday, September 01, 2006 - 10:57 am: |
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Steve Fox has one of these
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keith
Senior Member
Username: keith
Post Number: 142
Registered: 02-2002
| | Posted on Friday, September 01, 2006 - 11:27 am: |
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 162
Registered: 07-2002
| | Posted on Friday, September 01, 2006 - 09:15 pm: |
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Great info Keith. I hadn't studied the port layout that close, had only removed the manifold and cover while the engine was still in the truck. The diagarm clears it up, the passages I thought were going to the transfer port are additional third ports, feeding the base through slots in the piston. This was high tech for the time. The crankshaft is bent, lucky the flywheel wasn't cracked. I'll have to straighten it and make new timing gears, the old ones looked to be of pot metal. |
foxman
Visitor
| | Posted on Friday, September 01, 2006 - 10:58 pm: |
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I have, as noted the racing 21 hp triple. As originally bought, the engine had been stripped of all brass and bronze external fittings and the timing gears had rotted (pot metal). I was able to find three scheblers at a very reasonable price and have the timing gears recast. I have the same auxiliary air vent set up on mine as well. I have no idea why they made a racing single. As the picture shows there was a oak or mahogany coil box attached directly to the cylinder, but I'm not sure what the bracket looked like. I don't know what the spring on the timer shaft was supposed to do. The ad fro the triple shows the 1912-1916 version. Mine has the larger and deeper timer housing so it, like yours is probably 1910-1912. Does your engine have a round fitting on the manifold for an exhaust stack, mine does. |
keith
Senior Member
Username: keith
Post Number: 143
Registered: 02-2002
| | Posted on Saturday, September 02, 2006 - 10:43 am: |
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Steve's 3 Cylinder Racing Mohawk
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 163
Registered: 07-2002
| | Posted on Saturday, September 02, 2006 - 08:36 pm: |
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Fine looking engine Steve, my engine has a plug in the top of the manifold for a stack, the flange is missing on the rear of the manifold.I would think they made a single cylinder racer for lower classes. The spring on the timer probably keeps the timing geears loaded to prevent rattle. |
richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1337
Registered: 11-2001
| | Posted on Friday, November 17, 2006 - 08:23 pm: |
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Mohawk 1912
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richarddurgee
Senior Member
Username: richarddurgee
Post Number: 1412
Registered: 11-2001
| | Posted on Friday, February 02, 2007 - 10:44 am: |
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Just recieved a 1915 Mohawk catalog, this was certainly was a very sophisticated manufacturing Co. besides the 3 port, 2/3 port and special racing engines They also mfg these Kerosene engs --- two cycle- 2 port and water cooled main bearings !
1915 Mohawk
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jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 226
Registered: 07-2002
| | Posted on Friday, February 02, 2007 - 10:36 pm: |
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Richard, looks like this was a high tech company in it's time. The water cooled mains was enlightening, I haven't seen much main trouble but the explaination about it removing heat from the rod bearing would be a big help. |
