Members of the Milwaukee Model T Club helped tear into my 1912 engine to fix a bad magneto, and oil dumping into the pumpkin. Found a beautiful, counter balanced crankshaft with the name "Sure MIKE" cast into it. It could date back to 1974 when the car was restored. Does anyone know of this company?
Yup, those are notorious for breaking...
They did have a heavier style, which might be o.k., but I'd be concerned if I had one in my car. Sorry. BTW, they were made in the days of the Model T.
The Sure Mike does really look good, and perhaps yours will be fine.
I bought one in 2002 and had check out magnafluxed OK, but finished up .030 under on the throws. Used it with fat rods too. Was gonna run it in a speedster, but changed the plans, and parted out the project.
This engine with that Sure Mike may be running today, but I have no contact with the buyer since then.
The advert forgot to mention that it cures cancer too;)
I have one in my 26 Coupe. It is noticeably smoother than my other engines. I don't run it much but it hasn't broken yet either.
I wonder if the reputation has been the result of people driving the CRAP out of Sure Mike cranks. I acquired one that cleaned up nicely at .010 but haven’t gotten around to installing it yet. Of course I also run fibre cam gears with zero problems!!
We had one in the Speedster, it broke.
The Speedster now has a SCAT crankshaft.
Earlier on the forum it has been written about a smaller radius at the end of the journals on the first series of Suremike cranks, giving them the nickname "Surebreak". Then another improved series was made with larger radii, but the damage was done and nothing is harder than repairing a bad reputation..
Of course, metallurgy is also important and it's doubtful any small company were as good as Ford by the mid 20's when the EE steel was developed.
I too had one in a speedster and it broke to the point that I had to replace the block and and all the moving parts. That $200.00 didn't go to far.
I need to take my Hamilton 23 j Railway Special to 309 N Hamilton so i will look around.Bud.
I had one in my 12 touring. It broke on tour down in Mexico breaking the rear main destroying the block.
If it hasn't broken in the past 80 to 90 years, it seems the odds of it being a good one are pretty high. I'm going to pull the bearing caps and check clearances. Am I taking too much of a gamble by using this crank?
Just finishing up Theodore's repaired 1912 block with a Scat crank. Much better choice.
I agree with Les. I don't think Sure Mikes were ever meant to be turning high RPM's, but rather as a replacement crank to lessen vibration. Other companies making Model T speed parts for racing made stronger cranks. A Sure Mike driven like a stock T crank Should last as long or longer than a stock T crank, but not in a truck, or heavy sedan, especially if you push or 'dog' it too much.
no one commented on the broken cranks if the engines had been balanced! vibration /harmonics can break any crank. have your crank magna fluxed ,checked for run out , journals round, and if it is good spend the $ and have the whole rotating assembly balanced . money well spent on keeping bearings in the block.
A new scat crankshaft is $1,600.00 and 1 phone call.
A good 1912 block might be around $3,000.00 after a lot of searching and evaluation for the right one.
At least have the Suremike crank crack-tested before re-installing it and also check the fillets and make sure they are 1/8”.
Welcome to the forum WW Musil