Pelican Parts Forums - My new piston 3.0+

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Quote:

Originally Posted by Henry Schmidt (Post 11718894)

Hi Fred
I like your "new" design. Very impressive.
One thing we questioned with CP and JE pistons is the sharp transision between valve pockets. We discovered that by simply rounding those "sharp" edges that horse power gains were substantial and compression loss is minimal. A measured 5 HP in 200. Theoretically, it promotes better exhaust gas expulsion. I'm sure you considered this mild modification but I thought I would mention it for people who didn't.
Cheers

http://forums.pelicanparts.com/uploa...1655387413.jpg

http://forums.pelicanparts.com/uploa...1655387413.jpg

Henry, I'm somewhat a newbie to the Pelican forums, and just finding this thread. I recently built a RoW 1980 SC engine using the 74.4 crank and rods from a Turbo to get a 3.2. I worked with both William Knight and Dick Elverud to spec it and do machine work. I assembled it. One of the things I like to use in engines is thermal barrier coatings (TBC). William advised against TBC on the piston or combustion chamber. However, I did put it in the exhaust port to reduce heat transfer to the heads.

It looks like the pistons you posted have a TBC on them. Is that TBC or just a different surface finish?

Thanks for sharing your extensive knowledge.

�� friendly bump

Still interested, please reach out when you're free.

Sent from my Pixel 7 using Tapatalk

Bumping for me to respond, or Henry? I'm hoping Henry will reply.

Quote:

Originally Posted by PeteKz (Post 11896340)

William advised against TBC on the piston or combustion chamber. However, I did put it in the exhaust port to reduce heat transfer to the heads.

It looks like the pistons you posted have a TBC on them. Is that TBC or just a different surface finish?

Thanks for sharing your extensive knowledge.

I'm not sure I understand the logic in ignoring thermal barrier in high heat applications.

http://forums.pelicanparts.com/uploa...1655387413.jpg

POWERKOTE™ CBC-1 CERAMIC THERMAL BARRIER COATING

Quote:

Thermal barrier/heat management

Reduces part temperature. Protective to above 2000°F.
Keeps heat in the combustion chamber longer through the power stroke.
Blurs hot spots. Reduces the potential for detonation.
Highly resistant to thermal shock. Survives cyclic heating and cooling.

Henry, do the manufacturers of these coatings ever provide a thermal conductivity value at the recommended application thickness?

I googled the one posted, found only application instructions.

How do you evaluate expected effectiveness without that kind of basic data?

Sent from my Pixel 7 using Tapatalk

Responded to all pms
Cheers
James

Shipped a few sets have a few guys waiting for spec sheets.

3.0 set shipping Thursday
In stock we Have
1 3.0 set left
4 3.2 sets
4 3.4 sets
1 3.6

I will take a set of the 3.0 if you still have them. Pm me please.

I wonder too about thermal coatings but am thinking that putting them on the piston crown implies that you would need to adjust cold clearances-perhaps risking them being too tight cold and risking skirt damage,
In other locations though there is certainly merit.

Can I ask how much a set of 3.0’s? I’m building a stock with a 964 cams. Evaluating my budget.

Quote:

Originally Posted by porschedude996 (Post 12144146)

Can I ask how much a set of 3.0’s? I’m building a stock with a 964 cams. Evaluating my budget.

Current pricing is 2300$ shipped.
Just sent a set to California this week about 4 days coast to coast currently.

Thanks guys.
All pms responded too

How do these pistons work with a CIS?

Quote:

William advised against TBC on the piston or combustion chamber.

I guess we all get to choose who we listen to.

From Mahle Motorsports.

Quote:

Ceramic coatings on piston crowns are proven technology, and MAHLE is now offering their proprietary ceramic thermal barrier coating on any of its PowerPak lineup of performance forged pistons, in both the gas and diesel engine lineup. MAHLE’s Ceramic-based coating acts as a physical heat barrier on the crown of the piston.

http://forums.pelicanparts.com/uploa...1708900859.jpg

An article from Engine Builder Magazine.

Quote:

JE’s Nick DiBlasi,
Fortunately, unlike some custom piston upgrades or options, ceramic crown coat is appropriate for all kinds of applications. “One of the great benefits of ceramic coating is that it is so universal,” DiBlasi explains. “We have huge success using this in all types of applications. We apply it on pistons for forced induction, nitrous oxide and naturally aspirated applications regularly, and have tested it on all fuel types. In order to ensure compatibility with whatever customers might throw at it, we have done extensive work creating ‘worst case’ scenarios in an attempt to make the crown coating formula fail so it won’t cause a problem for the end user. We go through a rigorous testing process to ensure we are getting maximum adhesion and benefits.”
Because ceramic crown coating is thinner than a human hair, it can be applied to any piston without requiring any changes to the crown or combustion chamber design.

Overall ceramic crown coating is good insurance for the racer pushing the edge, especially in the forced induction and nitrous realms. In naturally aspirated environments, the additional heat reflected into the chamber can even improve exhaust scavenging that returns real world horsepower!

Has anyone who has purchased these pistons, built an engine and run it yet? If so, what was your engine spec and how did it perform?

There must be at least a dozen sets out in the wild by now?

Henry, thanks for that update. Next time that's what I'll do. If there is a next time...

Quote:

Originally Posted by mikedsilva (Post 12201476)

Has anyone who has purchased these pistons, built an engine and run it yet? If so, what was your engine spec and how did it perform?

There must be at least a dozen sets out in the wild by now?

Mike, as you may know, we have a set of 98mm one for 74.4 stroke 3.4. Looking forward to the engine we do finally build with them.

Cheers

Quote:

Originally Posted by Jeff Alton (Post 12202215)

Mike, as you may know, we have a set of 98mm one for 74.4 stroke 3.4. Looking forward to the engine we do finally build with them.

Cheers

Hi Jeff, yes, really looking forward to hearing from someone like yourself with experience and able to say "yes" or "no" to this design.

We are also waiting for the first engine to get finished with a set of my dad’s pistons.
Currently we have 4-3.2 sets left in stock 4 3.4l sets in stock and one for a ss 3.0.
If anyone needs specs please reach out