Anyone have an idea of of what it is for the h22?

 

bump

 

it's whatever you can afford to make it

 

lol he means stock

vin I don't think anybody is gonna know this, but you could always try to find an SAE article on it or something, or you could always do the math

 

Found the answer. Honda engineers published an SAE paper on the F20c after the s2k's release, in which they discussed volumetric efficiency. Apparently they showed the graph of the f20c and for comparison's sake, also showed the h22.

F20c peak VE: 112%
H22 peak VE: 102% !!- This was accomplished what...almost 15 years ago!

 

see I knew it damnit....now i gotta go show those idiots in the all motor forum....

where'd you find the info??

I'd like to see the k series numbers also

good info dude

 

Another quick interesting fact: at 7000rpm, the F20c has ~30% lass friction loss than the H22. This article should be a score since our engine is used as a reference point. I'm going to see if the university library has the article, otherwise I'll dl it from SAE.

Here's the link to the article that referenced all the info I posted:
http://autospeed.drive.com.au/...=1127

For any of you interested, here are the details of the SAE paper:
SAE Technical paper (2000-01-0670) Titled Development of the High-Power, Low-Emission
Engine for the "Honda S2000" by Yutaka Otobe, Hiroshi Kawaguchi and Hideo Ueshima of Honda R&D Co., Ltd.

 

Slowly, but surely the facts are revealed. I want the truth!

 

For those of you at a university campus, you have access to the SAE Digital Library through your school. Looking at the article right now..very detailed comparison of the F20c and H22. The way the paper is written by the Honda engineers, it's clear that the f20c is based on h22 and that the h22 is what they strived to improve of off.


Modified by vinuneuro at 2:53 PM 10/24/2006

 

Wait.....am I reading this right? This paper says the F20C has FRM sleeves and forged pistons?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Televator &raquo;</TD></TR><TR><TD CLASS="quote">Wait.....am I reading this right? This paper says the F20C has FRM sleeves and forged pistons?</TD></TR></TABLE>

Yes...so does the NSX. High silicon content.

 

I thought FRM=Cast pistons. Does Honda use forged pistons for all FRM aplications?
What makes them different from other forged pistons?

 

Search.

 

Iron coating.

 

good find Vin.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vinuneuro &raquo;</TD></TR><TR><TD CLASS="quote">The way the paper is written by the Honda engineers, it's clear that the f20c is based on h22 and that the h22 is what they strived to improve of off.</TD></TR></TABLE>


impressive

 

what exactly is volumetric efficiency?

 

^if you read last months grassroots motorsports, they give a quick summary.

if not, just type that into google/wikipedia

http://en.wikipedia.org/wiki/Volumetric_efficiency

 

So can h22's use f20 pistons? they are both 87mm bore, sorry if that'sa noob question

 

Most street motors run anywhere around 65-70%, performance motors run around 100%, Nascar runs 115%, drag 120-125%. Cosworth actually has a bike that runs at 145%

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludesleep &raquo;</TD></TR><TR><TD CLASS="quote">Most street motors run anywhere around 65-70%, performance motors run around 100%, Nascar runs 115%, drag 120-125%. Cosworth actually has a bike that runs at 145%</TD></TR></TABLE>

so I guess the h22 is pretty good at VE...

 

So why exactly is having high velocity efficiency good?

 

the higher the VE # the more air is in the cylinder.

100% VE means that the cylinder is 100% percent full of its air capacity

when you know what you're doing you can get a head that flows so good that when the piston reaches bottom dead center and starts to come back up the bore, air is still coming in.

Its kinda like having boost without having boost, its just the momentum of air coming in the head that will actually fill the cylinder with more air than its volume.

 

damn.. I'm loving the amount of GOOD threads we are having lately. there are soo many good reads/threads, I have to bookmark some to read later.. I NEED to get the SAE article. How to I get to it for free from my college? is there a thing through the website or do I need to be at school for this?

 

I think you can buy them online for around 15 bucks? but i'm not sure

do a search on society of automotive engineers and i think you'll find the site.