papsimagoo
Delicious Boost! Nom nom
- Joined
- Jan 3, 2007
- Location
- Los Angeles
Heads off, this is my first cometic replacement. Don't know what thickness originally was used. If they print any ID/PN on them let me know, I didn't see any.
Piston to deck measurements- ~ 0mm-.4mm below block deck height on cylinders 1 and 4 averaged out...
So I believe it goes .003" for every 1000 rpm, redline 7k so 7x.003=.021 +.003" for safety puts me at ordering around a .030" compressed....BUT i have waveguide/large valve relief pistons..want/wanted to make sure I am doing this right before trashing a motor. Do the pros factor reliefs/dished pistons into their CRs?
BTW going to use real hylomar.
Engine Specs:
2.5l B230F + T by RSI
RSI 86mm Billet Stroker Crank
RSI 158mm H-Beam Connecting Rods
RSI Waveguide 8v Turbo Pistons
Cometic MLS Head Gasket
RSI Stage 2+ Cylinder Head Prototype
RSI Race Valvetrain Kit
RSI Stage 3 Turbo Cam Prototype
RSI Square Tooth Adjustable Cam Gear
RSI Twin Scrool SS Turbo Header
RSI Poly Engine Mounts
Twin Tial MVS 38mm External Wastegates
Greddy Type S Blowoff Valve
Holset HX40/Garrett Hybrid Turbo
Isuzu NPR Intercooler
NIW Motoring Intake Manifold
Megasquirt 2 EMS
Mitsubishi Coils
Injector Dynamics 1600cc Fuel Injectors
<a data-flickr-embed="true" href="https://www.flickr.com/photos/vividvideo/43132155281/in/dateposted-public/" title="Head off1"><img src="https://farm2.staticflickr.com/1786/43132155281_a7dfa45dc5_z.jpg" width="640" height="480" alt="Head off1"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
Piston to deck measurements- ~ 0mm-.4mm below block deck height on cylinders 1 and 4 averaged out...
So I believe it goes .003" for every 1000 rpm, redline 7k so 7x.003=.021 +.003" for safety puts me at ordering around a .030" compressed....BUT i have waveguide/large valve relief pistons..want/wanted to make sure I am doing this right before trashing a motor. Do the pros factor reliefs/dished pistons into their CRs?
BTW going to use real hylomar.
Engine Specs:
2.5l B230F + T by RSI
RSI 86mm Billet Stroker Crank
RSI 158mm H-Beam Connecting Rods
RSI Waveguide 8v Turbo Pistons
Cometic MLS Head Gasket
RSI Stage 2+ Cylinder Head Prototype
RSI Race Valvetrain Kit
RSI Stage 3 Turbo Cam Prototype
RSI Square Tooth Adjustable Cam Gear
RSI Twin Scrool SS Turbo Header
RSI Poly Engine Mounts
Twin Tial MVS 38mm External Wastegates
Greddy Type S Blowoff Valve
Holset HX40/Garrett Hybrid Turbo
Isuzu NPR Intercooler
NIW Motoring Intake Manifold
Megasquirt 2 EMS
Mitsubishi Coils
Injector Dynamics 1600cc Fuel Injectors
<a data-flickr-embed="true" href="https://www.flickr.com/photos/vividvideo/43132155281/in/dateposted-public/" title="Head off1"><img src="https://farm2.staticflickr.com/1786/43132155281_a7dfa45dc5_z.jpg" width="640" height="480" alt="Head off1"></a><script async src="//embedr.flickr.com/assets/client-code.js" charset="utf-8"></script>
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