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| BronxFigs:
Tom- Already some questions.... What material(s) did you use to fabricate the crankshaft/flywheel combination, and also the crank pin? Diameter of the flywheels? Frank |
| John Stevenson:
Awesome, can't wait. The last one was a classic, in fact best post on this forum for the whole year. |
| micktoon:
I am looking forward to this too Tom, enjoyed every post last time , so good luck and keep up the good work :thumbup: Cheers Mick |
| Manxmodder:
Hi Tom,as the others have said this project will be worth following. I see you're using taper rollers for the main bearings. You may experience some problems with brinelling and surface fatigue due to the slight flex of the crankshaft when it is running. Taper rollers do not tolerate bending loads which load the outer edges of the roller elements and outer race. My own preference would be barrel roller bearings or spherical roller bearings as these are designed with shaft flexure type of stresses in mind. Even the humble ball bearing has better resistance to the type of loadings seen on a crankshaft than the tapers do. Just my thoughts and views on the matter of suitable main bearings.....OZ. |
| OKTomT:
thanks for the support guys. Here are the specs. Flywheels 1.250 x 8" Crank pin 1" 3* taper Rod pin 1" 3* taper on one end press fit on the other bore 3.275 x 2 stroke 3.75 1036 cc :thumbup: This build is going to take a little longer than the last. I am going to try to make the best parts that I can with these worn out machines before I move on to the next part. The crank has a tir .030 because of the rod pin and I need to figure out where I am off and get it right before I move on. The crank in the last engine had a tir of .008 and the rod pin was tapered on both ends. so I know I can get this one a lot closer. I will keep you all posted as I make progress. Manxmodder thanks for pointing this out before I built the crank cases I think you are right. I am going to change to roller bearings Tom |
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