I will be really interested to hear about how this setup gets allong, my L26 has a limited lifespan and I will probably be looking at a bit of a step up in the performance stakes. I dont suppose you know any dyno figures for the setup?
------------------- > Terry, > > Sorry I was vague on my previous post. The clearances I'm talking about > is between the SC mounted where the AC pump used to be, and the passenger > side chassis rail. The SC is wider than the AC pump was and there is > about 8mm gap between the SC and the chassis rail (note: now 25mm and now > the top of the SC hits my extractors.. grrrr.. going to slot the sc > mounting bits so i can try to find a nice even spot). Anyway.. what I > meant was in relation to how an engine will "twist" when its revved? How > it moves sideways a bit? How much clearance do i need between SC and > chassis rail so it won't bang when i plant it? > > The L28 sits exactly (as near as I can tell) where the L24 did so the > angles between gearbox etc should still be good. > > Thanks for the detailed response, appreciate your time/input as always. > :) > > Dave > > >>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<< > > On 8/18/02, 11:02:16 PM, "Terry Rudd" <[EMAIL PROTECTED]> wrote > regarding RE: L28->240Z almost there! Questions.: > > > > Dave, > > > You have been busy. > > > With regards to your question I don't fully understand what you are > asking > > about so I'll write in very general terms - usually clearances are seen > to > > be OK by engineers RTA types etc as long as there isn't any evidence of > > solid component contact at anytime. They mainly look at exhausts, > alternator > > brackets, filters, air cleaner assemblies and the like. > > > What component(s) are you referring to that have only 8mm clearance eg > sump > > to xmember? > > > Does a 240Z have a split tailshaft? It's so long since I looked under one > I > > can't remember. If they have a split shaft then ignore what I'm about to > > write as it only applies to single piece tailshafts. > > > One thing to watch when you modify the natural position of the engine > > and/or gearbox is that you don't upset the plane between the gearbox > output > > uni the diff input uni. If the distance between plane is outside 5% from > > parallel then this will put the unis out of harmony with each other and > it > > will cause all sorts of noises and/or vibrations at certain speeds on the > > road, technically it's relative to tailshaft revolutions but much the > same > > thing. I've seen this problem with gearbox conversions in 1600's as it's > > very often overlooked and it will also come into play if you modify > engine > > mount heights and not modify gearbox mounting heights. I'll try to draw a > > simple picture as if you've never had someone explain this to you while > > under a car, it's a bit difficult to get a handle on. > > > gbox uni ---------------- > > ---------------- diff uni > > > A one piece tailshaft typically follows a straight line from the > beginning > > of the top broken line to the end of the bottom broken line and as the > > gearbox and diff in the example are in a parallel plane the angles that > both > > of the unis spin in are the same and everything will be sweet. If you > move > > either of these components up or down so the angle on the unis is greater > > than +-5% of each other then they'll rumble. How did manufactures get > around > > this problem in the family car or race car for that matter? Invent the > split > > tailshaft, and I wish our early Dattos had them, especially those with > IRS > > ala 1600. > > > Does this problem occur in IRS uni half shafts? Short answer is Yes, but > as > > a driveshaft is ~2' long, then 5% is a much greater distance to modify > the > > position of either the diff or the short axle. Interestingly, lowering a > > 1600 has far less effect on this in the rear end as does fitting > > wheels/tyres that are way oversize from stock. Anyone who's been in a > 1600 > > with 17's with the rear springs that have about 1/3 of them cut off and > > stock uni half shafts fitted would have noticed the racquet that goes on > in > > the rearend. How did manufacturers fix that one? They invented the CV > > shafted rear end. > > > I recall reading recently that someone is snapping half shafts or unis, I > > would mind betting that there is a bit off, could even be something along > > these lines in the rearend of that Datto as you have to really try hard > to > > snap a uni - side stepping the clutch at 6 grand with 300 hp on tap on > > slicks can do it though. > > > regards > > Terry > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED]]On Behalf Of David Andrews > > Sent: Saturday, 17 August 2002 8:24 PM > > To: [EMAIL PROTECTED] > > Subject: L28->240Z almost there! Questions. > > > > G'day All, > > > Well I spent today plonking my L28 into my 240Z and am happy to report > > that everything is going well so far. This is the supercharged (baby > > SC12) engine I just purchased and my query is with regards to clearances > > for the chassis. How much clearance between engine/chassis is required? > > Currently there is bugger all (8mm) but I'm modifying the mounts tomorrow > > which should take it up to around 25mm. Will this be enough? > > Regards, > > > Dave > > > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
