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Honda Tuning; let's Talk FRM

 
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Old 01-04-2010, 09:15 PM
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Honda Tuning; let's Talk FRM

As we all Know, Were the odd balls. I was lookin on the web to find out if a b18b1 was iron walled ( still kinda unanswered ). and i came across honda tunings FAQ. I've never known the truth about FRM (or remotely about it t all) until i stumbled across this in my b series search (go FIGURE!)

I cannot say it's true 100% but i Find it useful. So let's talk about FRM!

I get your magazine every month and in the Exhaust Notes section of the May '08 issue you were talking about the H22A. You were saying that its cylinder walls are fiber-reinforced metal (FRM). What exactly does that mean? I have wanted to put an H22A into a CRX or Del Sol for some time. Are there advantages or disadvantages to FRM?
- David Jones
Houston, Tex.

With the exception of a few oddballs, including the H22A, most Honda engines use cast-iron cylinder liners. Unlike cast iron, FRM is a metal-matrix composite made from carbon fiber and aluminum oxide, both high-end materials. The benefits of FRM as opposed to cast iron include improved heat transferring from the cylinders to the water jackets, higher wear resistance, and less weight. FRM allows designers to keep engine package and cooling system sizes minimal since heat-transfer properties are better, but Honda didn't exactly do that with the H22A. Instead of making the block smaller, which would in turn decrease the cooling system's jackets and port dimensions, Honda kept it the same, which means FRM-lined H22As are potentially more efficient in terms of cooling than cast-iron-lined engines, which means, in theory, they'll last longer. FRM is ceramic based, like spark plug insulators, so it's more durable than cast iron and theoretically has a longer service life. Theoretically. There's nothing wrong with FRM liners, that is, until you get into a buildup, and even then they're not so bad. The problem lies not just with the liners but the pistons. Honda developed special gravity-cast, aluminum-alloy pistons with specific expansion rates that work in an FRM environment. FRM liners expand more than cast-iron ones, which means the pistons have got to account for the expansion. Most aftermarket forged pistons are manufactured for use with cast-iron liners, which means popping a set in an FRM block can spell serious problems. None of this is really that big of a deal anymore though. A few piston manufacturers offer FRM-compatible forged pistons and ring sets and, if that doesn't float your boat, you can always sleeve the block with ductile iron sleeves, which you'd end up needing anyway if you're shooting for big numbers.


Honda Engine Swap and B16 Cam Questions Answered - August 2008 Exhaust Notes - Honda Tuning Magazine
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Old 01-04-2010, 10:29 PM
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Re: Honda Tuning; let's Talk FRM

wow really good info that I never knew about nice
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Old 01-04-2010, 11:56 PM
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Re: Honda Tuning; let's Talk FRM

indeed, reall cool info about what many deem an "Omen"
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Old 01-05-2010, 12:59 AM
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Re: Honda Tuning; let's Talk FRM

its no omen. Automotive engineers have been writing papers and doing research on FRM since the 60s and 70s.

do some searching on sae.org for the technical papers and you will find some interesting abstracts.
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Old 01-05-2010, 06:26 PM
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Re: Honda Tuning; let's Talk FRM

good find
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Old 01-05-2010, 07:40 PM
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Re: Honda Tuning; let's Talk FRM

still don't like frm...
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Old 01-05-2010, 08:15 PM
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Re: Honda Tuning; let's Talk FRM

yea i remember reading that article....
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Old 01-05-2010, 10:44 PM
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Re: Honda Tuning; let's Talk FRM

Quote:
Originally Posted by eludeauthority View Post
still don't like frm...
still don't like FRM?!
thats why your h23/h22 lude definitely has over 100,000 miles and you brag all over chevy's how your car will run for ever right?

Thank the FRM and timeless hours put into your engine.


blake, i've talked to you a few times, I know damn well from those conversations it isn't an omen!
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