"sony1492" (sony1492)
07/06/2019 at 18:59 • Filed to: SC400
5
3|
"sony1492" (sony1492)
07/06/2019 at 18:59 • Filed to: SC400 | 5
| 3 |
Oem
After
Material removed to mark the boundry
Spent some quality time with a dremel, still some work to be done evening out each cylinder but it’s basically done.
P olished the combustion chambers down to 500 grit, soon the heads will be sent off to be skimmed down to a perfect surface in preparation for an mls Head gasket.
Plans seem to wash back and forth with this motors output, after needing to rebuild it there was a hope for 18-20 psi and high 6 or low 700whp. But the clutch price combined with the chance of random failure sent that idea home, it’s been too long since this car drove and stayed driving. So the current plan is to rebuild the engine using stock components save for Mls head gaskets, then run the engine at wastegate pressure(8psi) and see where that leaves me. Hopefully the clutch I already have(rated for 390hp) wont slip like crazy at the 380-450whp it’s going to make, otherwise it’ll be another $1300 for the custom-ish clutch.(not too bad in the long run but really out of this budget) The hope is to make power without having constant reliability issues, it should be okay since unopened 1uzs take about 450whp before running into issues but then again I have excellent luck with them.(*jump cut to my last car on fire after replacing the head gasket*)
Also apparently my new stock pistons and rings are coming from the UAE.
Discerning
> sony1492
07/06/2019 at 19:23 |
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I don’t have the nerves to port and polish heads. I would be too concerned I would actually decrease peak flow and the flow across the lift range.
This article in particular made me not even want to try:
http://speed.academy/10-myths-of-cylinder-head-porting/
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sony1492
> Discerning
07/06/2019 at 19:50 |
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It was a consideration.
My thought process: With the engine being tuned for maximum low end torque to cope as an automatic luxobarge the cylinders were optimized for maximum low end air velocity to create that very flat torque curve you see above(also very conservative valve overlap). As a result the intake necks down sharply before the valves, here I tried to highlight that area;
If anything this will jut be part of the learning experience having had an unopened motor at 7psi with the same trans and turbos to compare with.
The polishing of the combustion chambers was primarily to remove carbon and remove minor casting imperfections that I feared would heat unevenly.
MM54
> sony1492
07/07/2019 at 17:39 |
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Nice work!