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.

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

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

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?

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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.

Henrys post
 

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.

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

Thanks guys.
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How do these pistons work with a CIS?

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

From Mahle Motorsports.

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

An article from Engine Builder Magazine.

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...

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

Anyone with real world experience using these?

Waiting for a few guys to finish engines on set me and my father have sold.
My dad ran them in a bunch of motors before releasing his final revision to the public

I’ll stay tuned. Thanks!

I used them for my 3.8 MFI build and made 410 hp at 11 to 1 compression on 93 octane.

MST0118 - the piston pic at the beginning of this tread has inverted dome (channel between intake and exh valve), however pic in your engine post did not… Most likely because cr only 11:1 on 102’s which must not need volume on either side of channel to get cr?

Yes.. his pistons look more conventional to me.. not at all like Fred's design.. But I am still learning as we go...

Yes, my pistons probably had to have more conventional shape because had reduced compression height due to using longer rods and Xtreme heads have less chamber volume. The weight of Fred’s 98mm piston is 430 grams where my 102mm piston was 422. So, maybe these factors caused the shape to be less of a dish? There’s probably less of an advantage with dish design when piston has less dome like mine.

I have a set of 98mm going into a 3.2 to make a 3.4 , comp is 10-1piston.
Measured at 9.78 deck clearance at .040", knight 75 cams , "MaxxEcu Street" Brain
Carrillo rods, should be on the dyno at the end of the month.

I forgot, PMO ITB's

Ian

Looking forward to seeing the results. Have the same set of pistons on our shelf....

Will go a different route ECU/CAM wise, and run on ITB's....

Cheers

Ian... also looking fwd to how this all shakes out...
You got this Ian & you have put in the time & have the experience & resources to achieve a great build...!!
Carry on...!!

I say 183.2 RWHP

I talked to Ian this morning.. I'll up my guess to 350 HP

Well this engine fired right up this am, 2200 rpm to 2600 for 20 minutes to brake in the cam and rockers .

It is running very well, very crisp, and snappy . A little drive up and back put a huge smile on the drivers face . 315/35/17 tires on the rear .

The dyno run is set for next Monday at 8 am eastern time .

Congrats… Sounds awesome…. But, we need some pics… a picture says a thousand words…

A dyno chart says 2 thousand words..

A video says it all....

Ok, the short story is , 308 hp at the crank @ 6350 rpm on the Dynojet 248 scale

I will post Dyno graphs and info shortly , the TQ is the amazing set of numbers .

All on 1.5" standard SSI heat exchangers, too small for this displacement of 3.4 ltrs

More to come
Ian

Ian… Fred is looking down on you from above with a great big smile & applauding…!

1.48 HP/CI, that is pretty good..

Well done Ian!

I look forward to seeing the dyno graphs.