Turbobike Web Site www.Turborick.com
EXTREMELY well put John,........ Jeff Churchill J.C. Performance 617-06 Bicycle Path Port Jefferson Station NY 11776 USA tech: 516-928-6679 or 516-928-9863 website: http://www.jcperformance.com/ On Thu, 20 May 1999 23:29:26 +0100 "John C Williamson" <john.williamson5@virgin.net> writes: >After thinking about this for a bit I think that the main reason that >coper >gaskets 'go' as such (apart from the oil seep / cappiliary problem) is >that >the head may 'lift'. The PEAK cylinder pressure goes up enormously >with >ignition advance but power output may only increase marginally. So if >you >have clamping / barrel stud strength problems causing you to blow >gaskets it >makes much sense to reduce full advance to a lower figure, and up >boost >instead, producing less peak pressure but more where it counts ie, >later! >when the crank is in a better or more advantagous position to take >advantage >of the increased cylinder pressure to produce more torque from less >pressure. I suspect most detonation / pre-ignition / head gasket probs >are >caused by too much advance. >This is one of the reasons that Nitrous does not seem to cause >detonation >and head gasket probs as often, because it is inert (and can put out >fires!, >like C02 does!) and only breaks down into Oxygen & Nitrogen (most of >the >atmosphere - and does not support combustion) LATER in the chamber as >it >takes time for this to occur. Just the same as less advance really. > >So basically if you want to go fast safely, go rich - less advance - >and >loadsa boost and Nitrous and you will not break the engine.. look for >black >smoke (a little!) and anything that sounds harsh or 'pings' (you >cannot hear >it on a bike...) nedds less advance... This will still blow gearboxes >/ >clutches etc, even more so in fact but the motor should be OK >without >expensive parts. > >I welcome your coments (Rick?) , anybody! > >JOHN WILLIAMSON >----- Original Message ----- >From: Bob Shammas <b.shammas@worldnet.att.net> >To: Rick <gsxr1100@ptw.com>; Turbo list <turbobike@natvideo.com> >Sent: 20 May 1999 22:16 >Subject: Re: [turbobike] Re: SOHC Honda headgasket problem > > >> I like the multi-layer steel head gaskets. They probably don't make >one >for >> that application but I've found they seal compression very well >without >> o-ringing (I either use Yamabond-4 or Gasgacinch as a sealer) and >tend to >> leak much less oil than solid copper. I still use solid copper for >my >KZ/Z1 >> dragbikes (and put up with the oil seepage), but go for MLS anytime >it is >> availbable for one of my newer projects. >> >> Bob >> -----Original Message----- >> From: Rick <gsxr1100@ptw.com> >> To: Turbo list <turbobike@natvideo.com> >> Date: Thursday, May 20, 1999 10:33 AM >> Subject: Fw: [turbobike] Re: SOHC Honda headgasket problem >> >> >> > >> >----- Original Message ----- >> >From: Rick <gsxr1100@ptw.com> >> >To: John C Williamson <john.williamson5@virgin.net> >> >Sent: Thursday, May 20, 1999 6:25 AM >> >Subject: Re: [turbobike] Re: SOHC Honda headgasket problem >> > >> > >> >> I would try like john said but I use Yamabond on the head >gasket. >> >> Silicone gasket sealer made things worse than nothing at all for >me. >> >> If that doesn't work then try oringing the cylinder. >> >> >> >> Turbo Rick >> >> 350HP Turbo GSXR1100 Street bike >> >> Web Site http://www.ptw.com/~gsxr1100/ >> >> Southern California Timing Association 1998 Fastest Bike of the >year >> >> EL Mirage Land speed Record holder 204.626 MPH >> >> E-mail gsxr1100@ptw.com >> >> >> >> >> >> > Slightly more seriously, make sure that the gasget is well >annealed, >> and >> >> > that the surface of the head / block is FLAT and not polished. >A >> >flycutter >> >> > usually used to machine the surfaces leaves a 'machining' >pattern on >> the >> >> > surfaces. This 'bites' into the gasket and holds it into >position. >Make >> >> sure >> >> > that the surfaces are fully degreased, and then use a SMALL (I >mean >> very >> >> > small smear!) smear of silicone gasket sealer (very thinly!) >around >all >> >> the >> >> > bore edges, and oilways. This stops the capilliary effect that >actually >> >> > makes the oil penetrate under the gasket, which allows the >gasket to >> >blow >> >> > out of position. Try to get stronger studs as they probably >lift / >> >stretch >> >> > under boost. >> >> > >> >> > John Williamson >> >> > >> >> > ----- Original Message ----- >> >> > From: Joe Allan <beak@seaside.net> >> >> > To: <turbobike@natvideo.com> >> >> > Sent: 20 May 1999 06:13 >> >> > Subject: [turbobike] Re: SOHC Honda headgasket problem >> >> > >> >> > >> >> > > Hello All; >> >> > > Just came back from trying out my supercharged 750 >Hondamatic >dirt >> >> > > dragger, goes good but after the 10th run down the track the >copper >> >head >> >> > > gasket blew :-( Pulling it apart tomorrow....any hints?? >> >> > > Stock studs only allow 16 pounds torque. >> >> > > Joe Allan >> >> > > Vancouver Island >> >> > > Canada >> >> > > >> >> > > >> >> > >> >> >> > >> > >> > >