Side Rod Clearance Question

[e philpott]

Many of the high rpm/high dollar builds are now using piston guided rods. The crankshaft big end side clearances are large.
See interesting article: https://www.enginelabs.com/engine-tech/the-great-rod-side-clearance-imbroglio-clearing-up-the-confusion/
Cool picture below.

Oil loss is determined by bearing clearance, not the side clearance (unless side clearance is too tight).



My stroker 385 series engine ended up with over 100 thou side clearance (offset ground crank and + .400" BBC connecting rods) Not a problem at all in 15 years.

Is the rod area on the Piston Pin side tighter on this set up to keep the rod centered up with less movement  for piston guided rod ? or just normal ? Floating too ?

[blykins]

Many of the high rpm/high dollar builds are now using piston guided rods. The crankshaft big end side clearances are large.
See interesting article: https://www.enginelabs.com/engine-tech/the-great-rod-side-clearance-imbroglio-clearing-up-the-confusion/
Cool picture below.

Oil loss is determined by bearing clearance, not the side clearance (unless side clearance is too tight).



My stroker 385 series engine ended up with over 100 thou side clearance (offset ground crank and + .400" BBC connecting rods) Not a problem at all in 15 years.

Is the rod area on the Piston Pin side tighter on this set up to keep the rod centered up with less movement  for piston guided rod ? or just normal ? Floating too ?

Rod little end doesn't hardly have any side clearance between the wrist pin bosses on a piston guided rod.

[frnkeore]

What sort of end play do they use on piston guided rods and is there any wear or battering issue with it?