I'm thinking of getting the Moly coating on the side skirt's and the ceramic coating on the top of my Endyn Rollerwave's.

I will be running a 10:1 CR with around 18 psi.

Anyone sware by this technology? or...just think it's a waste of money?

Thank's for any info.
Bryson

 

Anybody?

 

No one?

 

That bad eh?

 

No one has any info?

I'm shittin' a brick over here! help me out!!

 

Bryson:

How about calling Larry and asking him?

Also, how are you planning on getting 10:1 out of those pistons in a ZC? The Rollerwaves only give 8.5:1 from Larry. I'm going to lightly deck the block (.005") and mill the head (.025") and get the CR to about 9:1. Compared to the other D series engines, the ZC has a very large chamber.

There's no way to get the Rollerwaves to 10:1 unless you close up the chamber somehow. I will be using cam gears to correct for the milled head.

Sonny

 

Hey Sonny...

Good to hear from you..

I feel lost without the Hondata forum.. LOL

See ya,
-Jason

 

I got a set of rollerwaves from PaynTech and I bought them with the coating. I would have to have the pistons with and without the coating to give you an honest opinion so I can't really. I'm just getting the engine going this week so I can't say anything at all just yet.

 

From a theoretical point of view...the benefits from the coatings are well worth it. Jet engines use coatings...dont know if they are exactly what swain uses...but those engines see more heat than any of our motors will ever see. And if engineers who are meant to build stuff reliably and cheaply put them in..the coatings must work.

 

I was told by Larry himself, and also by Abaz(homemadeturbo) that they have a 9.5:1 ZC flat top piston. Larry told me to then shave the head to .02" to acheive the 10:1.

?

 

Bryson:

Are you sure that those are not the NA pistons? The FI pistons have a compression height of 1.174" and they have a "dish" (negative dome volume). The stock brown top ZC piston is 1.181" and it is flat. That piston yields 9.3:1 in a stock sengine.





The above piston has a compression height of 1.174" and a dome volume of about -4cc (I'm guessing here since I haven't actually measured it). This yields about 8.5:1 in a stock ZC.

Here are some OEM Honda pistons:


To get the compression ratio you want, you need a flat top piston with a tall compression height. In this picture, that is the PG6B (86-87 USDM D16A1 and 86-87 JDM ZC). That piston has a compression height of 1.181 and the dome is +1.5cc.

With the pistons above, decking the block .005" (it needs it anyway) and milling the head .025" will bring the compression ratio from 8.57:1 to 9.07:1. That is my plan.

Sonny


[Modified by Sonny, 7:06 PM 7/1/2002]

 

Abaz-

"Compression is 9.5.1 (basically stock) These pistons are made by Wiseco designed by Endyn."

To me those piston's are a flat top design. I havn't seen the differences between the N/A and the FI piston's so I can't really tell if they really are the N/A.

 

Bryson:

I saw those before...don't rely on pictures or what other people said or you will not get what you want. I don't know if Jeff's pistons are different than the ones that I got, but I can tell you with 99% certainty that the ones that I purchased will NOT yield 9.5:1 compression unless you make some big changes:

Compression Height: 1.174"
Piston to deck clearance: 0.000" (assuming a decked block of .005")
Head gasket thickness: .048" (stock 89 Integra gasket)
Piston dome/dish volume: -4.0cc
Combustion chamber volume: 43.8cc (I measured this and verified that it is correct)
Bore: 75.5mm
Stroke: 90.0mm

Plug those numbers into the compression calculator here:
http://www.c-speedracing.com/howto/c.../compcalc.html

...and you'll see what you get. I'll double-check everything after the stuff is installed (by using my buret again), but that calculator is very accurate.

Don't get me wrong...I just want you to make sure that you get what you really want. The compression ratio in the ZC is always going to be a lot lower than other D series because it has a huge chamber in comparison:

ZC/D16A1: 43.8cc
D16A6: 38.0cc
D16Z6: 34.6cc
D16Y8: 32.8cc

I don't think it will be possible for you to run 10:1 compression on FI Rollerwave pistons. You could do it, but you would have to deck the block A LOT, you'd have to mill the head A LOT, and you'd have to run a very thin headgasket.

If you are absolutely certain and dead set on running 10:1, you might want to run the ZC pistons made by JE that http://www.raceeng.com sells. I was thinking about getting those, but I had a hard time getting the technical specs on them, so I stuck with the Rollerwaves at 9:1 and plan on upping the boost a little more to compensate.

Keep me posted.

 

I might end up going with them then if that's true.

Could you some how calculate how much I will need to shave the head to get a 10:1 out of the 9:1 JE's?

I wonder if there will be a power difference in running the JE's? I don't think they have as much ZC specific design feture's as the roller waves.

I will do what ever I need to run a 10:1 CR though. That is the basis of my setup

I am trying to track down so much info on these part's, but everyone has their differnet stories. I have to make up my mind at some point.

 

Bryson:

It's easy to do if you can get them to tell you the following numbers:

Compression Height
Dome/Dish volume
Piston-to-valve clearance

If you know those numbers, everything can be derived. If you have to shave a small amount off of the head/block to get the #'s you want, I think that's ok. However, if you have to go crazy, it's not worth it. You'll need cam gears to compensate and you may run into clearance issues since you're bringing the whole chamber closer to the piston.

Sonny

 

i thermal coated everything possible on the motor, have yet to see alot out of it, stilll waiting on the turbo manifold, but the concept is sound, and it does take a tad bit longer to warm up soo not sure,

id say do it if you got the time and money

give you alittle more security for those high combustion chamber tempuratures scenarios

 

Well I've got plenty of time(almost a year) to get everything setup and finalized.

If I can't end up with EXACTLY a 10:1 CR that is fine. I will take the highest CR I can squeeze with out clearance issues or changing piston design's.

It look's like I am going to swain coat the piston's, as I want the piston's to reflect most of the compustion heat away from the piston top's. I will most likely also send off ZC valves to get coated as well, so they will reflect the heat instead of absorbing it.

Any thought's?