Going Bigger Turbo....Any Suggestions?
06-22-2010, 05:33 PM
#92
here Reid http://forums.nasioc.com/forums/show....php?t=1942615
accoding to Ed they end up with a timing curve much more similar to an STI rather than a 2.0l WRX.
accoding to Ed they end up with a timing curve much more similar to an STI rather than a 2.0l WRX.
Custom piston sounds cheaper though...
06-22-2010, 05:34 PM
#93
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I have, more than once. The only flaw with that theory is that carbon deposits are not likely to hold heat unlike sharp edges and scoring in the combustion chamber. One of the original problems with the hybrid was people thought they could get away with the bore difference by just running thick head gaskets. Not only did they find out these have a higher tendency to fail but also that the lip of the combustion chamber had a tendency to cause hot spots leading to detonation. This drastically decreased the possible output by limiting the tuning. When dealing with internal combustion motors surface finish is very important. In some race applications you even see people polish the combustion chamber or even ceramic coat it. This is all done to limit the ability of the surface to hold heat.
sorry lorenzo. this has gone way off topic. haha
06-22-2010, 05:37 PM
#95
when i dremel the heads, i start with a carbide bit, then sanding barrel, then fine sanding, then light polish. It is actually smoother than the casting marks left in the rest of the head's combustion chamber. I questioned it myself, but 3 different tuners have told me that they didnt see any type of knock issue while adding timing.
sorry lorenzo. this has gone way off topic. haha
sorry lorenzo. this has gone way off topic. haha
Maybe JE has a custom piston for this combo, and you can try that for your next build, or you could work with them to design one.
06-22-2010, 05:41 PM
#97
when i dremel the heads, i start with a carbide bit, then sanding barrel, then fine sanding, then light polish. It is actually smoother than the casting marks left in the rest of the head's combustion chamber. I questioned it myself, but 3 different tuners have told me that they didnt see any type of knock issue while adding timing.
sorry lorenzo. this has gone way off topic. haha
sorry lorenzo. this has gone way off topic. haha
06-22-2010, 05:43 PM
#98
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too bad you arent going to just do the CNC. then it would be a real moment of truth.
i guess it depends on ho much material is removed. if they lower the compression more then you can add a little boost and timing. netting more top power...but slower spool and weaker out of boost power.
damn compression ratios
i guess it depends on ho much material is removed. if they lower the compression more then you can add a little boost and timing. netting more top power...but slower spool and weaker out of boost power.
damn compression ratios
06-22-2010, 05:46 PM
#100
when i dremel the heads, i start with a carbide bit, then sanding barrel, then fine sanding, then light polish. It is actually smoother than the casting marks left in the rest of the head's combustion chamber. I questioned it myself, but 3 different tuners have told me that they didnt see any type of knock issue while adding timing.
06-22-2010, 06:08 PM
#105
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I have, more than once. The only flaw with that theory is that carbon deposits are not likely to hold heat unlike sharp edges and scoring in the combustion chamber. In some race applications you even see people polish the combustion chamber or even ceramic coat it. This is all done to limit the ability of the surface to hold heat.
Exactly.