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whats the safe amount to mill a head
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mjbower View Drop Down
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Joined: 04 Oct 2009
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Points: 255 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mjbower Quote  Post ReplyReply Direct Link To This Post Topic: whats the safe amount to mill a head
    Posted: 03 Aug 2013 at 6:56am
on a b with m&w sleeves and pistons.need to keep in mind this is a hand crank tractor.thanks for any input.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81242 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2013 at 9:26am
.100 inch. Remember the  original compression was about 5.7 to 1... You will only get to about 6.5 to 1 if your lucky.  Wont ever be a "high compression " motor.
Like them all, but love the "B"s.
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Dick L View Drop Down
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Points: 5087 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dick L Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2013 at 6:48pm
Originally posted by mjbower mjbower wrote:

on a b with m&w sleeves and pistons.need to keep in mind this is a hand crank tractor.thanks for any input.


Up to .200 can be taken off without a problem. That is the most that I have removed on several heads.
For some reason this picture will not show.

http://images16.fotki.com/v301/photos/6/34676/7550174/Picture2027-vi.jpg?1375576752



I determined how much I could remove when building my pulling engines by sawing a head and boring into the firing chamber. This took all the opinions and myths out of what can or can not be done.







Edited by Dick L - 03 Aug 2013 at 7:13pm
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THE-MAN View Drop Down
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Remember to take a stone on a die grinder and chamfer ( round )   The crap out of the edge of the combustion chamber. You don't want any sharp edges.
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I do not know if the diferences in head stud loctation or any other issues would.make it not interchange but the 149 head has no combustion chamber and is flat.it would up the compression if it will inerchange.
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THE-MAN View Drop Down
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That's very true Pank. I do have a flat head for sale is anyone is interested.
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Dick L View Drop Down
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Originally posted by volfan volfan wrote:

I do not know if the diferences in head stud loctation or any other issues would.make it not interchange but the 149 head has no combustion chamber and is flat.it would up the compression if it will inerchange.


They will not interchange but if they would then you need to figure out how do you would keep the valves from contacting the pistons .
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SF 49ers Fan View Drop Down
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Points: 147 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SF 49ers Fan Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2013 at 8:57am
LEE??? OK, LOL that's cute. 
XXXOOO'sHeart


Edited by SF 49ers Fan - 04 Aug 2013 at 11:12am
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 81242 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2013 at 8:59am
Dick, its been a year or so since i did the "figuring", but it thought about .150 inch and the valves "might" touch the piston tops, so i stopped at .100 ... Did you cut into the pistons for valve clearance, or is the clearance really over .200 ?
Like them all, but love the "B"s.
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Joined: 18 Jun 2013
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Points: 147 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SF 49ers Fan Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2013 at 9:14am
Here you go Dick. I didn't have anything to do.
XXXOOO'sHeart


Edited by SF 49ers Fan - 04 Aug 2013 at 9:15am
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mjbower View Drop Down
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Points: 255 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mjbower Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2013 at 6:43pm
thanks everybody i think ill stick with .100 off from it to play it safe.
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Dick L View Drop Down
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Originally posted by steve(ill) steve(ill) wrote:

Dick, its been a year or so since i did the "figuring", but it thought about .150 inch and the valves "might" touch the piston tops, so i stopped at .100 ... Did you cut into the pistons for valve clearance, or is the clearance really over .200 ?

I took .200 off with no problems.
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Ken(MI) View Drop Down
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Points: 618 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken(MI) Quote  Post ReplyReply Direct Link To This Post Posted: 09 Aug 2013 at 6:55am
Mike, if you want to take it to the limit, let me know and you can borrow my sonic thickness tester. Hope to see you in Mulliken tomorrow. Ken
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