Oval Chamber Pistons
- Thread starter Fingers
- Start date
What's the difference or (main flaw) I guess in arias oval bowl? I broke a mahle race cast this season and am in the market for a new set
They are a poor wannabe copy that didn't even use the main purpose of the oval design.
Well if there forged what is the need behind the oval in the first place? I thought it was to keep strength over the wrist pin? But if noones breaking forged why would they even consider the oval
I don't know why the imitation was made. They do not incorporate the elliptical curves in three dimensions that were used in my design to distribute the forces away from the wrist pin and direct the combustion forces. The oval in the Arias that I look at is flat bottomed. Not unlike their round bowls. The improvement, if any, is marginal. However, I have not put a lot of time into analyzing it.
Pistons
Mark I have to call you out on someone hurting a set of Arias pistons. Fingers pistons have there place and seem to work great. I have another RG truck that I think I'm going to build a little for my son and it will probably get Fingers pistons. They seem to work well in a driver and that's what it will be. I'm not sure why Arias made the oval piston and there is no need for it from them. I'm going to guess someone thought they would be better and had them make them and they did. This industry is full of people that like to copy others and that is really a shame.
Mark I have to call you out on someone hurting a set of Arias pistons. Fingers pistons have there place and seem to work great. I have another RG truck that I think I'm going to build a little for my son and it will probably get Fingers pistons. They seem to work well in a driver and that's what it will be. I'm not sure why Arias made the oval piston and there is no need for it from them. I'm going to guess someone thought they would be better and had them make them and they did. This industry is full of people that like to copy others and that is really a shame.
Sorry Jeff, I didn't name brands just said that forged Pistons have been broken. I haven't seen an Arias piston broke personally but you are one of only a few people I know that runs them. I've only seen Mahle forged broken and a bunch of guys breaking race cast Mahle pistons.
I don't think those marks were from valves... I'll get some pictures of how they look after I cleaned them up a bit with brake cleaner. Those circles are injector spray I believe.
The white/yellow stuff is like some weird salt-like crystals. No pitting; it's on top of the carbon. Overall they're in very good shape I think.
Nozzles are 125% over done by Exergy. No timing over 30 degrees if I recall correctly, maybe even less.
Curious as to why only some have the moisture residue. Truck only sat for a few days between when the crank snapped and when I tore this down.
Thanks Shane. I have never seen injector markings like that, thats why I was worried. But why dont they show on all the pistons? The one in front is so much different.
On the bright side, looks like Jon's pistons are doing fine at 1000rw.
Normally a nozzle is spraying a little weird and causes different patterns on the pistons. While I had it apart I would have them checked out to make sure it all good.Thanks Shane. I have never seen injector markings like that, thats why I was worried. But why dont they show on all the pistons? The one in front is so much different.
On the bright side, looks like Jon's pistons are doing fine at 1000rw.
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Adrenaline Performance
Advanced Motorsports Technology / Socal
Blackout Performance
Calibrated Power Solutions
Dans Diesel Perfomance
Danville Performance
Deutech's Truck and Diesel Repair
Diesel Technology Source
Dirty Hooker Diesel / All Season
Fully Spooled Motorsports
Harshman Automotive
HSP DEISEL
HT Performance
Husker Diesel Inc
Maxd Out Diesel Performance
Pfeiffer's Engine Specialties Inc
Precision Diesel
Pro Diesel
Roderigues ATV
Top Notch Garage
Wehrli Custom Fabrication Inc
and others
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Are these a reliable replacement for the cut and coated lb7 pistons? For someone who plans to daily their truck?