Conrod and bolts, total 408,7 grams. Pretty nice compared to stock 4A-GZE (514.8 grams) weight.
I havent yet weighed the new pistons, but I believe each was around 300 grams.
Tag: conrod
Stock piston and conrod weight
Stock 4A-GZE piston and conrod. My scale maxes at 500g so I had to weigh everything separately
Piston and 20mm pin (pin got stuck) – 412.5g
Conrod upper 381g
Conrod lower 119.2g
Nuts 14.6g
Total weight 927.3g
Camshafts, bearings and intake
Here are the camshafts. Coatings for more slippery 🙂
Sadly, at the moment they’re the only engine bits I have. Rest of the stuff is at Martelius’
The bearings thing.
I spoke with a friend about conrods in general and also about symmetrical conrods, when I realized what the “always turn the engine to normal rotation direction” means. I’ve thought it had something to do with piston rings but oh boy was I wrong. It’s about bearings.
See the little notch there? The bearings should have a tang that goes into that notch. If the engine is turned “backwards”, the bearings could dislocate and jump off the notch, maybe resulting spun bearings.
Fuck I’m an idiot! I havent ever realized this before 😀
Second peek to the intake! Still much to do.
Connecting rod info
Better put this info up for later
ATM I can’t recall where I found the numbers, but with these I made my order to Auto Verdi and everything fits.
So, the stock 4A-GZE conrod measures:
Wrist pin diameter: 20mm Pin end width: 21.825mm Center to center length: 122mm Big end diameter: 45mm Big end width: 21.825mm