it would be an itneresting test as i belive the scat headds flow more with bigger valves but you gotta control that heat dissipation i too am running an 1835 and would love to know if just fitting bigger valves woiuld make any difference on cooling look at the hvx mods by bob hoover phill ----- Original Message ----- From: "Mark Langford" <n5...@hiwaay.net> To: "KRnet" <kr...@mylist.net> Sent: Tuesday, May 15, 2007 12:14 PM Subject: Re: KR> SCAT heads
> Benjamin Copeland wrote: > >> Is anyone currently running SCAT dual plug heads on a flying bird? For an >> 1835, does it increase >> the HP as significant as the ads imply? > > I have no personal experience with SCAT heads, but I asked a similar > question of Carl Vought, designer (from scratch) of the Buddy Twin > ultralight engine (which was killed by lawyers before the first one was > ever > sold). He said SCAT heads had a reputation for being oil leakers, and > that > they were designed for racing, rather than long term steady state use, and > that cooling was insufficient for prolonged high power applications such > as > airplane use. Having said that, I think Troy Petteway may have had an > engine with Scat heads on it, and somebody out there uses them on aircraft > engines, so they must work to some extent. I would think that at the RPM > levels that we operate at (relatively) low, the stock heads (assuming dual > port) would flow plenty, and that there would be little difference other > than the advantage of dual plugs. A quick Google search for "SCAT > aircraft > head" turned up http://users.lmi.net/~ryoung/Sonerai/SCATHeads.html , > which > also expresses concern over the lack of fin area for SCAT heads, and echos > what I was told by Carl. The fact that they were used by the ill-fated > HAPI > folks might be a bad sign, all by itself. > > Like I said, I have no direct experience, this is just an ignorant opinion > seasoned by hearsay, but nobody else responded so here it is, and perhaps > if > nothing else, it's reason to look into a little more before you leap... > > Mark Langford, Huntsville, Alabama > see KR2S homebuilt airplane N56ML at http://home.hiwaay.net/~langford > email to N56ML "at" hiwaay.net > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at http://www.krnet.org/info.html > > > -- > Internal Virus Database is out-of-date. > Checked by AVG Free Edition. > Version: 7.5.410 / Virus Database: 268.17.15/659 - Release Date: > 30/01/2007 09:31 > > -- I am using the free version of SPAMfighter for private users. It has removed 25575 spam emails to date. Paying users do not have this message in their emails. Get the free SPAMfighter here: http://www.spamfighter.com/len
