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  1. #1

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    Expanding Combustion Chamber In SOHC Head

    So I'm curious about this. We have a spare SOHC head laying round the shop. I wanted to play with it a bit b4 I do my DOHC swap, since I'm still accumulating parts. So i saw all this space where the piston meets the head. I was curious if that can me killed out to create a deeper "pocket" in the head for combustion. I have no dea what the ramifications of this would be. Any ideas. I have a dremel and some bits I really wanna use lol.
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  2. #2
    Get off my lawn.
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    It could. It would lower compression. Might be good for boost. Too bad the rest of the head is shit.

  3. #3

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    Can it be improved...mild porting at home with my dremel...this is my back up car...I'm getting a dohc head dont up for a fresh swap. Just wanna use what I got as a test bed...does anyone have a link for the post I saw before. Someone had posted pics of heads cross sectioned. I think there was a SOHC head. I cant find it. Also how would I find the new compression ration.

  4. #4
    siris's Avatar
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    The quench pad helps push the charge towards the exhaust valve/spark plugs and for a more efficient combustion. It also helps with swirl when the intake valve is opened. You won't gain anything by grinding it out.
    72 Charger: pissed me off, on jackstands.
    95 SW1m: Dohc swap. DD. I can haz boost?

  5. #5

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    Well that makes sense. That's the straight forward answer I was looking for.

  6. #6
    siris's Avatar
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    72 Charger: pissed me off, on jackstands.
    95 SW1m: Dohc swap. DD. I can haz boost?

  7. #7
    6S Moderator S.Bretz's Avatar
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    There is no telling how thick the material is there. On the DOHC head a cut up, most of the casting was about 1/4in thick. If you remove to much the combustion cycle may pop a whole in a thin area.

    I would just not do it. You will lower compression and lower fuel economy. As the piston comes up to that quinch area, the gasses between the piston and head shoot out into the chamber. The stuff that shoots out makes the charge air/fuel mix better so that you get a more complete burn.
    -6S Resident Mechanical Forensics member #001.
    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
    1998 F-250 5.4L triton...stock.

  8. #8

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    your best bet is a flat top piston with good piston/head clearance. instead of the dish piston that only uses a fraction of the quench area

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