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    Cylinder head



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    Re: Cylinder head

    Just found out that my cylinder head is cracked. I am looking for a good source for used cylinder heads. My car is a 1980 633csi. Help...

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    Re: Cylinder head

    Try to find a 84 to 87 head as they have more metal between the coolant passages making less prone to cracking, They bolt right up to the older block. My M90 head had 5 cracks in it so I tossed an 86 head on.1988 335is
    1995 740i
    1986 528e
    1981 633csi

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    Re: Cylinder head

    Thanks for the info! I found a company on the web (www.bmrparts.com) that has complete used heads with warranty for $408.00. I will find out what the newer year heads cost. Thanks again!

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    No problem

    www.firstfives.org under the FAQ section has a write up on the different year differences between the heads.1988 335is
    1995 740i
    1986 528e
    1981 633csi

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    Re: No problem

    Excellent website. Great article about the different heads! Thanks again!!!

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    Metric Mechanic?

    You can get a really nice head from MM for about $1200 ($2K for the super duper head).

    You may be able tyo find a parts car with a 633 head.

    BEWARE, the other post about using an 84 head on an M90 is BS. The bore is different on the two cars. it might work, but it is not the right head (ie different combustion chamber specs, etc...)

    633 heads shoudl be a dime a dozen.

    If the $480 head is guaranteed and clean, then go for it (after assuring yourself it is for the right block). . Buy new head bolts and gaskets from the dealer ($70), and do the job yourself. Takes a couple of weekends with allowance for other activities.

    S-----
    80 Euro 635 aka Rosanante - Don Quixote's steed...ready to carry me off to dream the impossible dream... La Verdad...the Truth.

    88 US 635 aka Katerina - svelte, smooth powerful, sexy...

    Scott Andrews
    Los Altos, CA

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    Worked just fine

    The block was an 1984 633csi, it had an M90 head on it when I purchased(don't know if it was origanl or not) I pulled it to replace all the gaskets and found all the cracks so on went a 1986 535i head. Like I said read the FAQ on www.firstfives.org
    http://www.firstfives.org/faq/cylind...r_head_faq.htm1988 335is
    1995 740i
    1986 528e
    1981 633csi

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    OK, so you went back to the original head

    from the wrong head...

    M90 has a 93.4 mm bore, the M30 has a 89 mm bore

    S
    -----
    80 Euro 635 aka Rosanante - Don Quixote's steed...ready to carry me off to dream the impossible dream... La Verdad...the Truth.

    88 US 635 aka Katerina - svelte, smooth powerful, sexy...

    Scott Andrews
    Los Altos, CA

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    Hum,

    The head is stamped M90 right behind where the cam gear would go, But it was on an 89mm bore Block1988 335is
    1995 740i
    1986 528e
    1981 633csi

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    Re: Metric Mechanic?

    What about the thickness of the water jacket (long slotted older style compared to the round hole style)? I am waiting for my mechanic to return from California to figure out what will work. The engine was rebuilt back in the 80s with about 30,000 miles (original owner never allowed the car to "break-in" properly / rings never seated). I have no clue what the bore size is and will let someone who knows these cars help me make the final decision. I may be able to use a newer head, but won't know until we take the cracked head off. It is leaking into the exhaust, so I am still driving it around town.

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    6er Engine types

    Call Metric Mechanic or Korman. Give them your block specifics, and see what they can do. I believe the 633 block is just a smaller bore M30 (M30B32).

    My 6er Enthusists Companioin book lists the following bores, strokes and compression ratios:

    US 633 Bore: 89 mm Stroke: 86 mm CR: 8.4
    EU 633 Bore: 89 mm Stroke: 86 mm CR: 9.0
    US 635 Bore: 92 mm Stroke: 86 mm CR: 8.0
    EU 635 Bore: 93.4 mm Stroke: 84 mm CR: 9.8 (PRE 1982) THIS IS THE M90
    EU 635 Bore: 92 mm Stroke: 86 mm CR: 10 (POST 82) THIS IS THE M30B35
    US M6 Bore: 93.4 mm Stroke: 84 mm CR: 9.8 THIS IS THE M90 WITH A DOHC HEAD
    EU M635 Bore: 93.4 mm Stroke: 84 mm CR: 10.5 (PRE 1982) THIS IS THE M90 WITH A HIGH COMPRESSION DOHC HEAD

    Note the M90 is a really different animal. The bores are very large, and close together. I suspect they may have changed the block slightly in the M6 (made it larger?), but I am not certain of this.

    So, your car should work fine with a conventional M30 head. -----
    80 Euro 635 aka Rosanante - Don Quixote's steed...ready to carry me off to dream the impossible dream... La Verdad...the Truth.

    88 US 635 aka Katerina - svelte, smooth powerful, sexy...

    Scott Andrews
    Los Altos, CA

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    Re: 6er Engine types

    Thanks for the info!

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