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Old 18th July 2011, 13:23   #1
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Default Uses of different Piston Crown designs?

Hi everyone ,
I recently visited the Federal Mogul Goetze factory . It was a good experience watching them make various pistons , piston rings and gudgeon pins . I quite liked the variation in sizes of the pistons i.e from a moped to a tank(forged piston) .However there was a question which struck my mind when i saw various piston crowns . Most of the pistons i saw had a different crown design on them .
Now my obvious question is that - What are the various uses of different piston crown designs ?
I wanted to ask this question to the head of the piston workshop but he wasn't available then . The workers didnt know much about it . Also i couldnt find much on the internet as well.
I request all the guru's to enlighten me on this particular topic . If anyone finds a suitable link then please post it here .
Regards .

MODS- You may move this to an appropriate section ,if required .
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Old 18th July 2011, 16:09   #2
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Default Re: Help: Uses of different Piston Crown designs .

To the best of my knowledge, Piston crown plays a very critical role in compression ratio of an engine. Moreover, it has to take a lot of stress and transmit the thrust. This depends a lot upon engine.

As per the engine requirement, different types of crowns are used. In some cases the crowns are so designed that can take load of higher output when the engine is modded. In some cases, the crown has round deeper surface for valve operations.

Would like to update myself further.
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Old 18th July 2011, 17:03   #3
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Default Re: Uses of different Piston Crown designs?

Crowns have multiple functions:

1. convert the pressure developed in ignition stroke to a downward force - carry that force to the piston rod
2. sustain pressure waves generated by occasional knocking
3. act as a thermal barrier between cylinder and crank area
4. introduce swirl in the fuel - controls knocking and helps more uniform combustion


you can get more info here:

Introduction to piston design for forced induction engines | Supercharger Performance and Engine Performance Parts
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Old 18th July 2011, 17:05   #4
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Default Re: Uses of different Piston Crown designs?

Mostly its designed as per requirement of compression/valve to piston clearance and Squish area. That is keeping in mind the location of the spark plug and how or from where the flame will progress.
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Old 18th July 2011, 17:53   #5
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Default Re: Uses of different Piston Crown designs?

To my best knowledge, piston crown is designed to
  • Fight reversion
  • Aid flow velocity
  • Induce swirl.

Last edited by dhanushs : 18th July 2011 at 17:57.
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