Difference between 5.5 and 5hp flatheads
- Thread starter RegalX
- Start date
- Tags 5.5 5hp difference flatheads
The Briggs I/C motors came as all bushing, bushing in block with roller sidecover, or dual roller. Depends upon how the client spec'd them! Most I/C blocks blocks I seen were bushing blocks and roller sidecover. They are purported stronger blocks than the full roller as there is more material around the bushing than the roller bearing!
as ive been told about the bushing vs bearing/bushing vs full roller bearing blocks is really the application. if you are doing circle track, you want a roller side cover and bushing block, as the left turns pushes the oil towards the bushing keeping it lubed while the roller side keeps the clutch side okay during turns and picks up oil on the straights
if you are running equipment that doesnt move, full bushing blocks are fine, but for moving machines they arent a good idea.
double roller i would think be best for mini-bikes that are going to be leaned left and right. I wouldnt be as worried about the less material around the roller bearing unless i was pushing big numbers, in which case you could easily have a welder add aluminum around the bearing bore.
if you are running equipment that doesnt move, full bushing blocks are fine, but for moving machines they arent a good idea.
double roller i would think be best for mini-bikes that are going to be leaned left and right. I wouldnt be as worried about the less material around the roller bearing unless i was pushing big numbers, in which case you could easily have a welder add aluminum around the bearing bore.
oh and all the IC motors are better because of the cast sleeve, but doenst denote whether it will be a bushing or bearing block. the .5 HP increase couldnt be hard considering its based on cutting edge 1940's technology... getting a .5 out of it could simply be an RPM increase in GOV, little bigger jet, etc
Yes. Plain bearing is the block metal for the bearing surface. Note that some engines have a DU (brass) bushing sleeve on the flywheel side for reduced wear. I pulled my 130212 apart and found it doesnt have that so mines a plain bearing engine in every sense. Im sending it out for work and Ill have a DU bushing and extra oil holes added. Looks like a nice little engine you have there!
