If you were going to build an engine from the ground up, what would be in it?

FixedWing · 10-24-2005, 01:29 PM

I'm just talking about the internals of the engine - not turbos, etc. The goal would be maximum breathing and strength to take big horsepower.

Here is my initial list:

* RS4 block
* RS4 crankshaft
* Aftermarket connecting rods (but which ones?)
* RS4 pistons (enough I think)
* RS4 or 2.8 heads (which offers the most potential?)
* RS4 or modified cams

What would others do differently?

Stephen

Bahn S4 · 10-24-2005, 01:37 PM

Funkweasel · 10-24-2005, 01:39 PM

1)Aftermarket crank(there is supposed to be a forged stroker available).
2)S4 block(I don't buy into the smaller main web windowing being very beneficial with the rs4 block)
3)Arrow rods.
4)JE Pistons.
5)2.8 heads
6)SDR cams(duh! ;-) )
7)Head studs
8)Lighter valvetrain components(maybe even to the point of going mechanical lifters/cams from Cat).
9)RS4 oil pump

WindyCityS4 · 10-24-2005, 01:41 PM

Mechanically lightened all aluminum block
H-beam forged rods
Forged pistons
Splayed main caps
forged and knife-edged crank
flow bench ported heads and intake manifold
equal length tubular headers
custom ground cams
dry sump oil system
piston oil sprayers
stand alone engine management

Johnny Bravo · 10-24-2005, 01:44 PM

especially as length increases.

WindyCityS4 · 10-24-2005, 01:48 PM

you know I respect your opinion.

clicky

Johnny Bravo · 10-24-2005, 01:49 PM

where did you hear about this?
any more information on cat's solid lifters?

WindyCityS4 · 10-24-2005, 01:50 PM

Johnny Bravo · 10-24-2005, 01:55 PM

I beams are only less popular in the aftermarket becuase of the extra operations required to machine them.

from a strenght/ mass i beams make the most sense.

Funkweasel · 10-24-2005, 01:55 PM

10-24-2005, 01:29 PM	#1
FixedWing Senior Member Account #: 66531 Join Date: Dec 2003 Posts: 7,155	If you were going to build an engine from the ground up, what would be in it? I'm just talking about the internals of the engine - not turbos, etc. The goal would be maximum breathing and strength to take big horsepower. Here is my initial list: * RS4 block * RS4 crankshaft * Aftermarket connecting rods (but which ones?) * RS4 pistons (enough I think) * RS4 or 2.8 heads (which offers the most potential?) * RS4 or modified cams What would others do differently? Stephen __________________ ================================================== ======================

10-24-2005, 01:37 PM	#2
Bahn S4 Elder Member Account #: 53141 Join Date: Mar 2003 Posts: 14,626	There are better and prolly cheaper pistons available. Simmply posted a pic a while back. __________________ ------------------- Bahn S4's non-fried non-breaded wing recipe Diet and Exercise: Paleo + Crossfit

10-24-2005, 01:39 PM	#3
Funkweasel AudiWorld Super User Account #: 28517 Join Date: Nov 2001 Posts: 10,145	Hmm....price barriers? 1)Aftermarket crank(there is supposed to be a forged stroker available). 2)S4 block(I don't buy into the smaller main web windowing being very beneficial with the rs4 block) 3)Arrow rods. 4)JE Pistons. 5)2.8 heads 6)SDR cams(duh! ;-) ) 7)Head studs 8)Lighter valvetrain components(maybe even to the point of going mechanical lifters/cams from Cat). 9)RS4 oil pump

10-24-2005, 01:41 PM	#4
WindyCityS4 AudiWorld Super User Account #: 52314 Join Date: Mar 2003 Posts: 7,544	Well....if $$$ was no object.... Mechanically lightened all aluminum block H-beam forged rods Forged pistons Splayed main caps forged and knife-edged crank flow bench ported heads and intake manifold equal length tubular headers custom ground cams dry sump oil system piston oil sprayers stand alone engine management __________________ In a world of constant change, it is the learners that shall inherit the future. For the learned soon find themselves capable of living in a world that no longer exists. Autobahn Country Club (North, South, combined), Blackhawk Farms, Gingerman, Grattan, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill and "The Ring"

10-24-2005, 01:44 PM	#5
Johnny Bravo AudiWorld Super User Account #: 6784 Join Date: Jun 2000 Posts: 5,384	everything but the H beam.. I beams are lighter and stronger. especially as length increases. __________________ Aim: Johnaudi mail: Johnaudi / Aol.Com

10-24-2005, 01:48 PM	#6
WindyCityS4 AudiWorld Super User Account #: 52314 Join Date: Mar 2003 Posts: 7,544	Not trying to change your mind, but a little light reading.... you know I respect your opinion. clicky __________________ In a world of constant change, it is the learners that shall inherit the future. For the learned soon find themselves capable of living in a world that no longer exists. Autobahn Country Club (North, South, combined), Blackhawk Farms, Gingerman, Grattan, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill and "The Ring"

10-24-2005, 01:49 PM	#7
Johnny Bravo AudiWorld Super User Account #: 6784 Join Date: Jun 2000 Posts: 5,384	As far as the crank? where did you hear about this? any more information on cat's solid lifters? __________________ Aim: Johnaudi mail: Johnaudi / Aol.Com

10-24-2005, 01:50 PM	#8
WindyCityS4 AudiWorld Super User Account #: 52314 Join Date: Mar 2003 Posts: 7,544	No lifters on a OHC engine __________________ In a world of constant change, it is the learners that shall inherit the future. For the learned soon find themselves capable of living in a world that no longer exists. Autobahn Country Club (North, South, combined), Blackhawk Farms, Gingerman, Grattan, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill and "The Ring"

10-24-2005, 01:55 PM	#9
Johnny Bravo AudiWorld Super User Account #: 6784 Join Date: Jun 2000 Posts: 5,384	From Someone .. way smarter than me.. I beams are only less popular in the aftermarket becuase of the extra operations required to machine them. from a strenght/ mass i beams make the most sense. __________________ Aim: Johnaudi mail: Johnaudi / Aol.Com

10-24-2005, 01:55 PM	#10
Funkweasel AudiWorld Super User Account #: 28517 Join Date: Nov 2001 Posts: 10,145	We have hydraulic lifters.

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