617 N/A Piston needed ASAP! - Page 2 - PeachParts Mercedes-Benz Forum

ROLLGUY · #16 11-02-2015, 04:18 PM

Quote:

Originally Posted by Stretch

So that's a difference of 3 grams?

Well within the FSM specifications

Yes, but I still need to weigh the rods. If not a significant difference, I will concede on the compression (lack thereof). Do you think the design of the piston top makes that much difference? I am having a hard time finding a piston, so I may end up using the same one with the different top, but honing and installing new rings like suggested.

Stretch · #17 11-02-2015, 04:21 PM

Quote:

Originally Posted by ROLLGUY

Yes, but I still need to weigh the rods. If not a significant difference, I will concede on the compression (lack thereof). Do you think the design of the piston top makes that much difference? I am having a hard time finding a piston, so I may end up using the same one with the different top, but honing and installing new rings like suggested.

Yes there is additional trouble with the pre-chambers too. I've posted a link for you in your other thread.

t walgamuth · #18 11-02-2015, 04:29 PM

I have some I am pretty sure....same as 240 D motors. If you want one I'll get my machinist to examine and sprinkle holy water on it.

ROLLGUY · #19 11-02-2015, 05:35 PM

Quote:

Originally Posted by t walgamuth

I have some I am pretty sure....same as 240 D motors. If you want one I'll get my machinist to examine and sprinkle holy water on it.

If you have one that matches, that would be great. Please let me know as soon as possible. Thanks, Rich

ROLLGUY · #20 11-02-2015, 05:39 PM

Quote:

Originally Posted by Stretch

Yes there is additional trouble with the pre-chambers too. I've posted a link for you in your other thread.

I can see no problem with the prechamber, as there is plenty of clearance with the piston right up against the head. Just to be sure, I will put a piece of clay in the dish of the piston and press it tight against the head. I will then measure the thickness of the clay.....Rich

ROLLGUY · #21 11-02-2015, 05:41 PM

Quote:

Originally Posted by ROLLGUY

Yes, but I still need to weigh the rods. If not a significant difference, I will concede on the compression (lack thereof). Do you think the design of the piston top makes that much difference? I am having a hard time finding a piston, so I may end up using the same one with the different top, but honing and installing new rings like suggested.

I weighed the rods, and they are both exactly the same weight. That tells me that I do not have a piston/rod balance problem.