are standard rst pistons forged or cast?
14-11-2010, 08:06 PM
#5
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They are pressure cast. AKA forged. They are a really good piston for a standard item and many people have had well over 200 bhp from them. The only reasons they usually fail is DET.
Last edited by juffer; 14-11-2010 at 08:09 PM.
15-11-2010, 11:52 AM
#11
Thats good to know, as im running a standard bottom end... So my planned 180bhp on 16psi should be fine lol!?
That was with a totally standard and semi shagged bottom end, went really well.
Rob,
15-11-2010, 11:56 AM
#12
Well im on OFAC so limited to 16psi, and im aiming for 180bhp. With a cam (yet to choose which) and a standard T3, if not il maybe get a stage 2/3 T3...
200bhp would be nice, but if i can break the 200lbsft barrier with around 180bhp i'll be happy! Esp on a standard bottom end.
200bhp would be nice, but if i can break the 200lbsft barrier with around 180bhp i'll be happy! Esp on a standard bottom end.
15-11-2010, 03:47 PM
#14
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15-11-2010, 10:47 PM
#16
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Well I'm still running my standard bottom end since the car was new, it now has 109k on the clock with a f.s.h which is amazing it's still going strong, and had mine running that sort of power for the last 2 or 3 years, as long as your bottom end is in good health you shouldn't have a problem mate.
15-11-2010, 11:42 PM
#17
Pistons are effected by cylinder pressure which isnt directly related to boost.
Put washers into your inlets and you could feed 100psi into your intake and still not see cylinder pressures that hurt the pistons.
As above they are pressure cast, so FAR superior to normal cast pistons, they are the same construction essentially as the standard YB pistons.
Put washers into your inlets and you could feed 100psi into your intake and still not see cylinder pressures that hurt the pistons.
As above they are pressure cast, so FAR superior to normal cast pistons, they are the same construction essentially as the standard YB pistons.
16-11-2010, 01:17 AM
#21
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The Mahle pistons are pressure cast - superior to typical cast auto pistons.
But - they are not forged.
A pressure cast piston is not the same as a forged aluminum piston.
This does not mean that the Mahle piston is crap - it is very good for what it was designed for.
But - they are not forged.
A pressure cast piston is not the same as a forged aluminum piston.
This does not mean that the Mahle piston is crap - it is very good for what it was designed for.
16-11-2010, 06:54 AM
#22
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Currently running 267bhp with 21psi standard c/r, pistons and rods. So pretty good for price. As above said rst mahles was designed to handle 136bhp and 180NM of torque.
Last edited by Antti O; 16-11-2010 at 06:57 AM.
16-11-2010, 07:48 AM
#24
Pistons are effected by cylinder pressure which isnt directly related to boost.
Put washers into your inlets and you could feed 100psi into your intake and still not see cylinder pressures that hurt the pistons.
As above they are pressure cast, so FAR superior to normal cast pistons, they are the same construction essentially as the standard YB pistons.
Put washers into your inlets and you could feed 100psi into your intake and still not see cylinder pressures that hurt the pistons.
As above they are pressure cast, so FAR superior to normal cast pistons, they are the same construction essentially as the standard YB pistons.
Rob,
16-11-2010, 08:05 AM
#25
The pressure in the cylinder is determined not from the amount of boost that is in the inlet, but the volume of air that is in the cylinder after the inlet valve has shut.
So if you have a very poor flowing inlet (ie washers to make the ports tiny like some motorbikes are restricted by) then even with huge boost you still wont swallow much air.
Im not recomending it as a mod, was just an extreme example of where boost isnt the b-all and end-all, its only 1 of many factors that effects cylinder pressures, so is cam profile and cam timing and exhaust flow and head flow and inlet design etc etc
So if you have a very poor flowing inlet (ie washers to make the ports tiny like some motorbikes are restricted by) then even with huge boost you still wont swallow much air.
Im not recomending it as a mod, was just an extreme example of where boost isnt the b-all and end-all, its only 1 of many factors that effects cylinder pressures, so is cam profile and cam timing and exhaust flow and head flow and inlet design etc etc
16-11-2010, 12:47 PM
#26
Lol that makes much more sense thanks, you seem to be pointing toward VE, didn't know what you were getting at with washers. I totally agree, cylinder pressure is one of the many forces at work on a piston.
Different pistons have different characteristics, different flaws etc, the cvh mahle piston seems to have a very low detonation tolerance compared with a few others, but seems very good in other areas, perfectly good enough for the majority of rs turbos on the road.
Rob,
Different pistons have different characteristics, different flaws etc, the cvh mahle piston seems to have a very low detonation tolerance compared with a few others, but seems very good in other areas, perfectly good enough for the majority of rs turbos on the road.
Rob,
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