Can anyone see what the clearance problem might be at BDC? (The Hemi Shop boy's are excluded from this question, lol) Clue #1: This is an offset ground crankshaft.

 

Just guessing... is it a problem w/ the clearance between the piston and the bottom portion of the cylinder wall? I don't know if the cyl. is smaller on bottom then on top. Please don't tell me you have to send the pistons back to Ross! Laters,

uniball

 

skirt hitting crank?

 

That sounded like my last date!

 

I'm thinking that is a possiblity as well James now that I looked at the side view of the pistons in this thread on page 27. Or is the bottom of the piston skirt possibly being exposed out of the cyl. at BDC? Inquiring mines wanna know Jerry.

uniball

 

Originally posted by hemi2nv:
Can anyone see what the clearance problem might be at BDC? (The Hemi Shop boy's are excluded from this question, lol) Clue #1: This is an offset ground crankshaft.

The little groove on the right side of the piston needs to be deeper?

 

If material is removed, remember to re-balance.

 

Clue, number two.

 

Here's a differnt look at it. Look at the crankshaft on the left. Look above the area, where you see the reflection from the flash.

 

Irregular tooth spacing?

Sounds kinda like Jay's sister!

 

Sounds kinda like Jay's sister

Great for eating corn though.

 

Rear cylinder skirt hitting tone ring?

 

BTW, was I right about the fuel tank question?

 

Great for eating corn though.

Through a knothole in a fence, no less!

 

If you notice the toner ring is only slightly bigger ( 0.005 ) then the crank counter weight. Then look again at the piston with the toner ring relief. The piston relief is .090 deep and we need ALL of that. The way it looks right now we only have .047 between the bottom of the piston and the toner ring. With a negative clearance for the piston.

 

In other words, Ross clearanced the bottom of the piston for the toner ring,(the groove cut in the underside of the piston) but did not take into consideration the height of the crankshaft throw. We will machine down the counter balance portions to make it work.

 

TR1Hemi, Yes you were right, except that I will be using an aluminum plate on top.

 

You make engine building a whole lot of fun. I love the little "what's wrong w/ this picture ???'s." So, a little hiccup. How can other's in the future avoid this? I hope it's not costing you to much more. Laters,

uniball

 

Uniball I think we have it covered. Our rod/piston combo is going to be completely different than what they are running and will clear the 3.80 stroker crank no problem!

 

You can go with a 6.250" rod, but that will only leave about .035" clearance. Too tight for me. Plus you start pushing the ring pack up too close to the top of piston.

 

Stu would be the one to help with all that... I know we discussed several options yesterday and he is looking into it.

 

All I can say is, If you want to be stroked, be prepared to pay.

 

Jerry, would you have had this problem had you went w/ the 6.125" rod vs. the 6.00" rod??? To me that would solve the problem. I know you did want the rings to be that far down on the piston but, that would have made your clearance issue from the bottom end null and void. Or am I missing the picture? Good Luck, you guys will overcome this little issue no problemo. Laters,

uniball

uniball

 

Even with the 6.125 rod there is a problem.

 

With the 6" rod's, or the 6.125" rods. 5 crankshafts were sent out for grinding today.