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Technical Advise - E36
- Thread starter beemer E36
- Start date
It is not equivalent to stroking up an engine. Stroking is best described as a process or modification to make your piston travel a longer distance within the cylinder, hence your engine capacity increases. It usually involves changing the crank shaft, con-rods and often piston as well. Most of the time it also involves matching fuel injection to the increased capacity and likely a re-map of your ECU.
Port & Polish (PP) is meant to smoothen the intake/outlet valves assembly including altering the approach angle of the port to allow better air-flow in and out of your combustion chamber. The aim is to improve the volumetric efficiency (VE) of your combustion to increase power and acceleration. It is more beneficial to older designed engine e.g. 2 valves type. You can further capitalized on your PP by improving your intake and exhaust tracks. Given a constant in all other factors (air temp/density, fuel, ARF, Brake specified F/C etc), the % increase in your VE is often proportionate to the % increase in bhp.
jeromez;298511 said:
It's not equivalent to stroking an engine, but since stroking is the easiest ways to increase demand on the head, doing it after a stroker conversion would yield the biggest gains. This is provided the orignal min. cross section was already sized perfect for the stock engine, or that the stock port trajectory and finish were poor...which is not often the case as mentioned earlier.
Even if the stock port had perfect cross section and trajectory, stroking alone would still net you power gain because equal flow is occuring now at a lower engine speed, and engine speed is the largest determinant of friction in an engine (square relation). So lower engine speed, dramaticaly lower friction.
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The first stroker limit you run up on varies from engine to engine. Anything from interference in crankcase, to interference with cam (OHV), or if not those, then in the end, for all engines, overall cylinder length to where the piston skirt starts to protrude from bottom of cylinder at BDC. It is tolerable to some degree, but once breakover on piston skirt (1 of 2 only real balance points) goes unsupported at BDC, then wear and oil consumption skyrockets, piston loses stability ----> ring seal is compromised, smoking begins.
There is also a theoretical interference limit of little over 0.5 rod length to stroke ratio where piston will contact crank or require cylinders far too long and wide, but this is never reached before any of the above limits. Other limits taken into consideration, you end up at a minimum of 1.3-1.4 range.
beemer E36
Active Member
Wah !
After hearing all the comments/views, am confused whether to 'Port & Polish' my engine.
Got a lobang in Malaysia to do it. Cost about RM$4,000.
If using additives can improve slightly, I would like to give it a try.
Can anyone advise me the type of additives to use.
Appreciate your reply.
Rgds.
