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Old 08-04-2017, 03:01 PM   #1
TheSnigg
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Hseries Forged Pistons on FRM Sleeves.

Peace cb7 fam. I wanted to start this thread, though I know this has been discussed @ nauseam. This is not to re-ignite an old topic but to add information and a possible solution to the H-series FRM cylinder liner conundrum.

After much research and hair pulling I may have found some possible solutions and piston options. However it may be contingent upon interest.

I have recently been in contact with a local company in VA called InlinePro. They have contracted CP to manufacture FRM pistons for the S2k. Because inlinePro has a successful clientele base CP can manufacture a set of these pistons at a comparable cost to all the other forgeed piston manufacturers. The upside being that FRM owners will not have to sleeve @ power levels under 500hp!!!

I'm sure if we can show enough interest and possibly spark a group buy to demonstrate demand in the H-series market we could have a solid option for pistons that would not require sleeves under 500hp.

Right now, a lot of tuners and companies do not know that there is a market for the H-series. It is a lesser known motor and many companies do not believe it can make good power. Here alone I have seen quality build producing power that can rival or exceed any K-series or F-series motor in the 4Cyl class. BoostedBoiz on YouTube runs a USDM H22 making 700hp off of the stock sleeves. He is currently running the Mahle Golds with a mild home, however he has already gone through one set of pistons and had slight scarring on the Cylinders. These motors can be formidable if there is enough support. The goal of this thread is to gauge that interest and show that there is a market fo H-series FRM pistons.

This is a huge opportunity! I am not selling anything I just want to see us all benefit from this opportunity. If we can get some chatter going I will be sending multiple communications to the company. I will be sending specs and bore sizes to inline pro this week. CP will need to digitize the specs and the pistons before production. I think we can do it! We have enough members who have built these motors!!

Let's get these positions on the marked and end the FRM debate!!!

http://www.inlinepro.com/s1/

Peace again:
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Old 08-04-2017, 05:21 PM   #2
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Seems like a waste of effort when you have Mahle Gold pistons available.
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Old 08-04-2017, 05:54 PM   #3
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I would hardly label the H-series a "lesser known motor". There are several companies and shops who not only believe in its capabilities, but have proven it. You must keep in mind that it's been well over a decade since it went out of production. Since then the focus has turned to the S2000's F-series and the K-series engines.
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Old 08-04-2017, 11:34 PM   #4
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Quote:
Originally Posted by Jarrett View Post
Seems like a waste of effort when you have Mahle Gold pistons available.
Mahle Golds still scar the cylinder wall. As I mentioned in the post this has been well documented in the past.
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Old 08-04-2017, 11:36 PM   #5
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Quote:
Originally Posted by apalileo View Post
I would hardly label the H-series a "lesser known motor". There are several companies and shops who not only believe in its capabilities, but have proven it. You must keep in mind that it's been well over a decade since it went out of production. Since then the focus has turned to the S2000's F-series and the K-series engines.
Lesser known...or maybe lesser supported in terms of manufacturing. H22a has pretty good support and an after market, though the FRM is still a limiting factor. H23a Vtech has no support though it offers the same HP and more torque.
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Old 08-04-2017, 11:38 PM   #6
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So then it's a waste...thanks for the support!
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Old 08-04-2017, 11:49 PM   #7
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no no no sir. the mahle have longevity issues, FRM is indeed a good thing so if there's an oem equivalent drop in (rings are another thread) that would be awesome, i expect them to start at no less then 800 unfortunately though.
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Old 08-05-2017, 04:17 AM   #8
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FRM is the same "limiting factor" that the S2K and NSX engines face with regard to pistons. There was a time JE used to offer a coating for their H22A pistons for FRM compliance, but now they specify their pistons are only for sleeved blocks.

Fact of the matter is, any piston other than what is on the market now, will have to be custom made. You'd be hard pressed to convince a manufacturer to mass produce pistons for an engine so far past its production end.
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Old 08-05-2017, 04:20 AM   #9
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As for the H23A VTEC, support for it is even further limited because it was never offered in any USDM Honda. Therefore any parts that are not interchangeable between the H22A and the H23A may only exist in overseas markets.
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Old 08-05-2017, 11:45 AM   #10
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Originally Posted by apalileo View Post
FRM is the same "limiting factor" that the S2K and NSX engines face with regard to pistons. There was a time JE used to offer a coating for their H22A pistons for FRM compliance, but now they specify their pistons are only for sleeved blocks.

Fact of the matter is, any piston other than what is on the market now, will have to be custom made. You'd be hard pressed to convince a manufacturer to mass produce pistons for an engine so far past its production end.
Exactly, that's why this could be a chance to get the same solution that has worked for S2k and nsx motors to work on the Hseries. Even if the motors are not made any more, there is still a current market. H's are cheaper and can produce the same power as k's. B and D series motors are also not in production yet there is more support. NSX is mostly specialty shops and the S2k is somewhere in the middle. I don't understand why, when there is a possible solution to an issue, would we not ouch for support.
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Old 08-05-2017, 11:48 AM   #11
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Originally Posted by illinois_erik View Post
no no no sir. the mahle have longevity issues, FRM is indeed a good thing so if there's an oem equivalent drop in (rings are another thread) that would be awesome, i expect them to start at no less then 800 unfortunately though.

The only OEM drop in that I have seen that can run some boost are the Nippon racing pistons. Nippon produces the pistons for the stock DSMs. These motors have been know to push 400+ to the wheels off the stock internals. I have seen Nippon pistons and rings with forged rods run over 350hp I hondas however for the Hseries they only come in 11.2 comp as "type s" pistons.
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Old 08-05-2017, 04:09 PM   #12
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The H is pushing 20 and there is still no coating that can be applied to a standard piston to remedy this issue? Do we even know what the stock pistons are "coated" with? Is it a material incompatibility issue? I would love some drop in pistons for the H.

The H23v is no different than the H22a minus rods, crank and oil squirters. Everything else is the same.

The crank is a standard 95mm Honda crank. The only thing exotic would be the rods, which you can go custom for.
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Old 08-07-2017, 03:40 PM   #13
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CP engineering has a full remedy that works for the Fseries FRM sleeves. However they only make them for InlinePro in VA. I am attempting to get a set made for the Hseries using the same tech.
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Old 10-30-2017, 03:47 AM   #14
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what make frm pistons different then regular pistons? i know the liner on the cylinder walls are different but is the piston different too.
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Old 10-30-2017, 06:59 AM   #15
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The FRM has aluminum in it, and since you can't use similar metals against each other (pistons vs sleeves), the pistons have to be coated in iron. It's still a standard cast aluminum piston underneath; or forged aluminum in the case of the S2000.
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