MOMMA , Will said NASCAR..... --- Will Wood <evilscientistboo@xxxxxxxxxxxxx> wrote: > Approx 5.4" is the stock length. Engine Builders > like to use the term rod ratio. The higher the rod > angle, the more stress > that is put on the rod via side load hence all of > the I Beam and H Beam rods on the market. The > advantage however is that you get more low end and > midrange out of the engine because you're > accelerating the crankshaft and pistons faster. If > you have a higher RPM engine or clearance issues > then you're forced to longer rods. In my 2387 using > Mahle B pistons I have 5.5" rods on an Okrasa 86mm > crank. The rod to skirt distance is about .80" at > maximum angle. Another drawback to higher rod angle > is more piston slap but you'll get that with B or > stroker pistons anyway. > > Another way to put it is a term called rod ratio. > That's the length of the rod divided by the stroke > of the crank. > Most engine builders like the ratio to be between > 1.5 and 2.0. Again, preferences, experiences may > vary on that number > but for a given rod length the lower the ratio the > higher the rod angle. NASCAR engines are somewhere > over 2+ because they > live at high RPM all day long. I had to put that in > there for all the NASCAR fans out here. > > A stock set of rods and a stock crank has a ratio of > 1.98 (5.394 / (69mm / 25.4mm/in)). 5.394 is the > actual > VW Stock Rod length but what's .006 between friends > right? > > So, assuming Denis goes with his stock 78mm crank > and stock rods that gives us a ratio of (5.394 / > (78mm / 25.4mm/in)) = 1.75 > > Like I said, stock rods will work on a stroker but > if you want to play with it invest in some better > rods. > > > > -----Original Message----- > >From: Dan <ThatVWGuy@xxxxxxxxxxx> > >Sent: Sep 13, 2007 6:55 AM > >To: tcb@xxxxxxxxxxxxx > >Subject: [tcb] Re: Engine building next chapter > > > >Longer than stock. > > > >Someone will correct me but I think stock is 4.8". > I'm using 5.0" rods on > >my 2017...something like that anyway. The point is > if you increase the > >stroke of the crank the rod angle changes. Picture > a cutaway view of an > >engine with the rod on a stock crank with the crank > at it's highest in it's > >revolution. The rod will be pointing down toward > the cylinder at an angle. > >Now picture it with a stroker crank, the angle > increases because the > >connecting point on the crank just got higher but > the connecting point on > >the piston stayed the same. By using longer rods > the connecting point on > >the piston moves out reducing the rod angle. > > > > > > > >----- Original Message ----- > >From: "Denis Dodson" <coocoo@xxxxxxx> > >To: <tcb@xxxxxxxxxxxxx> > >Sent: Wednesday, September 12, 2007 10:21 PM > >Subject: [tcb] Re: Engine building next chapter > > > > > >> This is a multi-part message in MIME format. > >> Mime-Version: 1.0 > >> Content-Type: multipart/mixed; > >> boundary="=======AVGMAIL-46E922D203C9=======" > >> > >> --=======AVGMAIL-46E922D203C9======= > >> Content-Type: multipart/alternative; > >> > boundary="----=_NextPart_000_00F8_01C7F582.F0CE6440" > >> > >> ------=_NextPart_000_00F8_01C7F582.F0CE6440 > >> Content-Type: text/plain; charset=iso-8859-1 > >> Content-Transfer-Encoding: quoted-printable > >> > >> Longer stock rods? > >> ----- Original Message -----=20 > >> From: Dan=20 > >> To: tcb@xxxxxxxxxxxxx=20 > >> Sent: Wednesday, September 12, 2007 8:40 PM > >> Subject: [tcb] Re: Engine building next chapter > >> > >> > >> 2017cc if 78.4 crank and 2007cc with 78.0 crank. > Lots more torque = > >> than what you had before. Because of the rod > angle you should consider = > >> using longer than stock rods. > >> > >> -Dan =20 > >> (...who is also building a 2017cc) > >> > >> ----- Original Message -----=20 > >> From: Denis Dodson=20 > >> To: tcb@xxxxxxxxxxxxx=20 > >> Sent: Wednesday, September 12, 2007 10:36 AM > >> Subject: [tcb] Engine building next chapter > >> > >> > >> That is a good idea, Shirley, about the engine > in Ruby, the Ghia. It = > >> is almost brand new. And if you will send me the > Porsche engine, Dunc, = > >> I'll pop that booger in as soon as I get it. > >> > >> I do think that it will go this way: Tomorrow, > probably, I will pull = > >> the engine and take it up to Wayout where he says > that he has all the = > >> tools to do machining and build. We will, at > least, tear it down and as = > >> Will suggested, see what we have. > >> > >> Then I will either build the new engine there, > probably using the = > >> 90.5 pistons and cylinders, or take the parts and > bus down to Chuck's = > >> and build it there the week before T@P. > >> > >> I have to tell you guys that it fees really > cool to have four = > >> engines offerred as loaners, not even counting > the Ghia. Thanks y'all. > >> > >> So, if I use the 90.5s and I have a 78.4 > stroke, what will the new = > >> engine size be, and what is the formula, anyway? > Multiply, add? I have a = > >> 1914, how do you get that number > >> > >> > >> > -------------------------------------------------------------------------= > >> --- > >> > >> > >> No virus found in this incoming message. > >> Checked by AVG Free Edition.=20 > >> Version: 7.5.485 / Virus Database: > 269.13.15/1002 - Release Date: = > >> 9/11/2007 5:46 PM > >> > >> > >> > >> > -------------------------------------------------------------------------= > >> ----- > >> > >> > >> No virus found in this incoming message. > >> Checked by AVG Free Edition.=20 > >> Version: 7.5.485 / Virus Database: > 269.13.15/1003 - Release Date: = > >> 9/12/2007 10:56 AM > >> > >> ------=_NextPart_000_00F8_01C7F582.F0CE6440 > >> Content-Type: text/html; charset=iso-8859-1 > >> Content-Transfer-Encoding: quoted-printable > >> > >> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 > Transitional//EN"> > >> <HTML><HEAD> > >> <META http-equiv=3DContent-Type > content=3D"text/html; = > >> charset=3Diso-8859-1"> > >> <META content=3D"MSHTML 6.00.2900.3157" > name=3DGENERATOR> > >> <STYLE></STYLE> > >> </HEAD> > >> <BODY bgColor=3D#ffffff> > >> <DIV><FONT face=3DArial size=3D2>Longer stock > rods?</FONT></DIV> > >> <BLOCKQUOTE=20 > >> style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; > MARGIN-LEFT: 5px; = > >> BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: > 0px"> > >> <DIV style=3D"FONT: 10pt arial">----- Original > Message ----- </DIV> > >> <DIV=20 > >> style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; > font-color: = > >> black"><B>From:</B>=20 > === message truncated === Paul Smith www.23window.com/thezone T.C.B. H.B.B.