Piston Bowls

[WolfLMM]

Great job Fingers and WolfLLY!

I just found and read this thread. After our last conversation, I'm glad to see Surfcam was able to generate some paths for you. I had no idea you had posted the geometry or I would have genrated some code for you as well.

Looks like the post could use a little tweaking to get rid of the faceting in the finish product or perhaps play around with setting #85 in your Haas control if it is a pre 2000 version OS.

Looks like you're about done, let me know if you want me to generate some different code.

Guy

And thanks to dmaxlover, for helping me out behind the scenes.

Wolf

 

[Fingers]

I got the calibrated burret last night. Testing the test cuts shows them to have a volume that does matches the Solidworks model.

Stock LLY piston chambers are very close to 39cc to produce 17.5:1 compression ratio.

Test Cuts are measuring 39cc prior to fly cutting for valve reliefs.

I need to increase the fillet along the edge and recalc. (too sharp)

Goal is ~18:1 with valve reliefs.

 

[minisub]

Man, this thread is so, well, 2005....

 

[Fingers]

First actual piston got cut tonight. I have to verify the valve reliefs and so on, but this should give me a solid 17.5:1 compression ratio. If it all checks out, I will cut the rest.

 

[JoshH]

What kind of piston blanks are those? What radius did you put at the top? It looks kind of sharp.

 

[Fingers]

Mahle Cast Flat Tops. Special order.

The pictures don't do the radius justice. .0625 radius around the bowl. That is similar to the radius on the stock pistons. The valve reliefs will be refined after I confirm they are in the correct positions.

 

[TrentNell]

The pistons look awesome , cant what to see how they work for you !!!

 

[Trippin]

Jon,

I just emailed an igs file to you with valve pocket surfaces and locations.

Hope it helps.

Guy

 

[LB7Diesel]

Amazing! Simply F en amazing! I should have went to college! Nice work to all involved:thumb:

 

[Rhall]

Looks good! What are the specs these will be tested under? Sorry if its already been said.

 

[Fingers]

Thanks Guy. That helped.

 

[S Phinney]

Really nice work Jon.

 

[770JOHNNYW]

thats awesome...i would love to see how those work! Very nice work man:thumb:

 

[Fingers]

Looks good! What are the specs these will be tested under? Sorry if its already been said.

LLY block
100 over injectors.
Dual Fuelers
Big Danville VVT stage 2
Castflow manifolds and up pipes.
Howards Rods
SoCal Stage 2 heads.
SoCal Cam

Pistons should produce 17.5:1 with the valve reliefs. I wouldn't put the reliefs in, but a similar build got me only 0.040" clearance on uncut pistons. I fudged a fix that didn't include cutting the pisotns, but it killed the compression ratio. 14.5:1 is just way too low. Live and learn.

 

[Fingers]

Interesting little fact:

These pistons have ~15% less surface area than the stock pistons and ~9% less than typical delipped pistons. If the BTUs of heat absorbed by a piston is directly proportional to the surface area, (it is if the chamber temp is the same) these will run cooler than stock.

 

[dmaxfireman]

jon you are a pioneer! i can't wait to see how these pistons do and might be motivated to tear my motor apart just for another piston swap! hahaha

 

[Dallas S]

8 shipped to 58265....

awesome work guys!

 

[MarkBroviak]

jon you are a pioneer! i can't wait to see how these pistons do and might be motivated to tear my motor apart just for another piston swap! hahaha

X2, awesome work Sir! You are wayyyyyyyyyyyy smarter than me.:thumb:

 

[Fingers]

jon you are a pioneer! i can't wait to see how these pistons do and might be motivated to tear my motor apart just for another piston swap! hahaha

I don't know about all that, but I do have some high hopes. Keep in mind that I have not killed a piston yet. I've only bent rods.

 

[duratothemax]

I've only bent rods.

I remember that.

I dont think ive ever seen one that folded without breaking.