Rod casting #'s and dimensions

[Eagle 5]

Here is my problem. I took my crank, rods, pistons down to a crankshaft shop/ machien shop to have some work done. I'm using a different set of 1G big rods I got that have the pin end already machined for the 2g pistons. The crankshaft shop told me the rods were too wide at the bearing end by about a hundred thousandth i or 80 he said. Now, they look like the 1G big rods but the casting numbers are different from the big rods i took out of my engine. My question is, are all of the 6 bolt big rods all the same just they have different casting numbers? Are the rods supposed to actually be that big or slightly oversized? And does anyone know what the casting numbers mean if anything at all? I need to know by this afternoon if possible so I can let them know. He said he was going to do some more measuring but any information would be helpful. Never heard of a rod being too wide but he thinks they are for something different. Didnt know if maybe the big rods were different in the E/T/L compared to the VR4 but to me that makes no sense since they use the same rods etc. I need to know soon. He said they would not fit the crank shaft but should I ask him to test fit them first?

Now this is width of the rod as if you were looking at it from the side, and not through the bearing/ pin holes.

 

[Eagle 5]

my rods that came off the crank say G6-A

The ones I bought say G6-Y

any difference? or are the rods supposed to be somewhat tight fit?

 

[EagleTalonRacer]

its probably the date that is was made, I just recently replaced a synchronizer on my tranny and the numbers were different, but if its for that application, it'll work but stone it if its a really tight fit careful with the torque specs MAN!

 

[Eagle 5]

The guy was going ot make more measurements and he told me to call him back this afternoon. Just never heard of the rods being too wide though. Guess i could ask him to test fit the rods and see if they fit the crank fine or if they are too big. He said something about possibly machining that tiny bit off, but I dont know.

Does anyone have the rod specs? I am at work and dont have access to the dimensions, not even sure if the rod width would be a dimension given. Any help is needed guys. Thanks.

 

[Eagle 5]

Well I called the shop back and the guy said they will fit. He thinks there is just 60-80 thousandths clearance on the old rods. I'm going to measure the set I pulled out of the engine with the set he is using and compare the widths. Maybe there is a difference between the wdiths of some 1g big rods and maybe the casting number has something to do with it, maybe not but Ill see what the difference is.

Main thing is he said they would fit the crank. Ill find out this Friday/ Saturday.

 

[blue1]

As far as i know there are only two rod widths 1.038 and 1.117 dont know if this info is any use?

 

[Eagle 5]

As far as i know there are only two rod widths 1.038 and 1.117 dont know if this info is any use?

Is this for 6 bolt rods vs 7 bolt rods? I gave the guy the big rods, and he had to take the pistons off the 7 bolt rods (2g pistons). The difference between those two rods is .079 or ~ 80 thousandths which is what he said the rods were bigger by. So I wonder if he just measured the 7 bolt rods and compared them to the 6 bolt rods, which would explain the difference in widths. He said they would fit the crank so thats all he needed. Now I can explain to him when I go to pick up the stuff the difference between them.

 

[blue1]

Just make sure you only end up with a few thou side float on the big ends (think its about 006) not 070' or say goodbye to your build before you turn the key!!

 

[Eagle 5]

Just make sure you only end up with a few thou side float on the big ends (think its about 006) not 070' or say goodbye to your build before you turn the key!!

It shoudl be, he said they fit the crank so he is not going to do anything to them. Just cleaning the pistons, putting the 2g pistons on the big rods (already machined for the 2g wrist pin), balancing the rotating assembly from flywheel to harmonic dampener, and replacing valve seals, clean up head, new seals. So engine should be pretty good. Just have to install pistons, rods, and crank myself.