Possible 2.9 forged pistons deal through alibaba

[G8orFord]

Good luck getting any compression out of that. Is that a 3/4 racing piston to go with the 3/4 cam?

 

[bobbywalter]

True, and agree. Hence the reason I'd e interested in having the CNC program made by the one dude. Worst case, you can hand a piece of bar stock and a flash drive to a local or online CNC shop.

As far as checking the base material for alloy, etc., i have access to a aerospace NDT lab that can do the neutron x-rays of them to check.

Yeah....for sure we can test....we test all the time because we have to explain fishing jobs alllllll the time.


And you can proof spec and test.

If your bitching at the right place you will get what you asked for.

 

[bobbywalter]

Good luck getting any compression out of that. Is that a 3/4 racing piston to go with the 3/4 cam?

Chevy guys.

 

[G8orFord]

Chevy guys.

LOL

 

[PetroleumJunkie412]

Talking to the draftsman at this moment.

Need one of you 4.0 fanboys to chime in. Having the 4.0 drawings based on the trinity piston as well. Need to know what you would want for bore, compression height, and dish.

Ring grooves as well.

@adsm08 @snoranger @gaz @Stroker

 

[PetroleumJunkie412]

Yeah....for sure we can test....we test all the time because we have to explain fishing jobs alllllll the time.


And you can proof spec and test.

If your bitching at the right place you will get what you asked for.

Ah yes.... When you send well fluid samples to test america for halogen group salt analysis, and your boots set off the radiation alarms when you walk through the front doors.

Good times...

 

[bobbywalter]

Cologne is smelly.....


But the power of these ones Will be epic.

 

[PetroleumJunkie412]

Updates, and a few requests!

One of the Trinity pistons has been sent to the draftsman making the production prints. Woo-hoo!

I'm going to see what he charges to have the CNC programs written for them.

If I do have the CNC program made, I'll ask @Jim Oaks to upload them to the tech section. At that point, anyone that would want to have them made could just send the CNC files to any local or online machine shop to have a set made.



Need some input on rings and wrist pins.

Current wrist pin is 0.866". The majority of 302 connecting rods are 0.912 or 0.927...

Thoughts and opinions on which would be the better pick? Or a size I did not list?

Piston specs are attached for reference.

@alwaysFlOoReD, @deathbypsi, @bobbywalter, @19Walt93, @DCinDC, (long shot) @AllanD, (and why not...) @Will




Also, need to hear from one of the 4.0 guys soon if he's going to do a production drawing for 4.0 pistons... Is there no interest in a forged piston for the 4.0l? Seems odd for the engine everyone claims is "better...:"




Also any thoughts on rings would be helpful. Trinity rings are expensive AF, and come in a set for eight pistons, so seems a waste to use them. Draftsman is willing to redraw ring spacing and grooves to take whatever rings we choose.

Was thinking about having them designed to take a Chevy 4.2l ring, or a 2.9 ring....

Goal is to be able to fit these with a moly file-to-fit style ring for bore size, so looking for options before I just flip open the Mahle catalog and point and pick lol.

 

[bobbywalter]

What ever is the minimum work.

 

[PetroleumJunkie412]

What ever is the minimum work.

Those are my thoughts. I've updated the draftsman with the thread so he can get a better feel.

 

[bobbywalter]

Don't tell anybody. Because I will deny this like a railroad.....


But I am actually getting excited about this.

 

[PetroleumJunkie412]

At this point....



Love or hate the 2.9.....





We're basically designing our own sh*t because the aftermarket has failed Cologne.



So I'm freaking stoked. This is awesome.







And it only makes sense to it open source like this because why put $1800 pistons in an engine worth $100.

 

[alwaysFlOoReD]

Any input I have is based on decades old knowledge....
- I have no input on pins.
- Rings...what happened to gapless rings? Are they not good long term?
- How about adding the small ports along the top perimeter of the piston. Drilled down to help pressure reach the back side of the top ring?
Does that allow a ring with less initial tension so less friction except on power stroke?

 

[19Walt93]

Updates, and a few requests!

One of the Trinity pistons has been sent to the draftsman making the production prints. Woo-hoo!

I'm going to see what he charges to have the CNC programs written for them.

If I do have the CNC program made, I'll ask @Jim Oaks to upload them to the tech section. At that point, anyone that would want to have them made could just send the CNC files to any local or online machine shop to have a set made.



Need some input on rings and wrist pins.

Current wrist pin is 0.866". The majority of 302 connecting rods are 0.912 or 0.927...

Thoughts and opinions on which would be the better pick? Or a size I did not list?

Piston specs are attached for reference.

@alwaysFlOoReD, @deathbypsi, @bobbywalter, @19Walt93, @DCinDC, (long shot) @AllanD, (and why not...) @Will




Also, need to hear from one of the 4.0 guys soon if he's going to do a production drawing for 4.0 pistons... Is there no interest in a forged piston for the 4.0l? Seems odd for the engine everyone claims is "better...:"




Also any thoughts on rings would be helpful. Trinity rings are expensive AF, and come in a set for eight pistons, so seems a waste to use them. Draftsman is willing to redraw ring spacing and grooves to take whatever rings we choose.

Was thinking about having them designed to take a Chevy 4.2l ring, or a 2.9 ring....

Goal is to be able to fit these with a moly file-to-fit style ring for bore size, so looking for options before I just flip open the Mahle catalog and point and pick lol.

If you're using 302 rods probably the least expensive way to change the pin size would be to put bushings in the rods and have full floating pins. You'd need grooves in the pistons to retain spiro locks or some other method to keep the pins in place. You must love those little engines to go through all that work and expense.

 

[19Walt93]

I've never seen a sentence that used the word "quality" to describe a Chinese product. Good luck, my fingers are crossed for you.