whats the safe amount to mill a head
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Topic: whats the safe amount to mill a head
Posted By: mjbower
Subject: whats the safe amount to mill a head
Date 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. |
Replies:
Posted By: steve(ill)
Date 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. |
Posted By: Dick L
Date Posted: 03 Aug 2013 at 6:48pm
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.   
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mjbower wrote:Posted By: THE-MAN
Date Posted: 03 Aug 2013 at 8:47pm
| 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. |
Posted By: volfan
Date Posted: 03 Aug 2013 at 9:55pm
| 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. |
Posted By: THE-MAN
Date Posted: 03 Aug 2013 at 10:11pm
| That's very true Pank. I do have a flat head for sale is anyone is interested. |
Posted By: Dick L
Date Posted: 04 Aug 2013 at 7:22am
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 . |
Posted By: SF 49ers Fan
Date Posted: 04 Aug 2013 at 8:57am
|
LEE??? OK, LOL that's cute.
XXXOOO's
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Posted By: steve(ill)
Date 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. |
Posted By: SF 49ers Fan
Date Posted: 04 Aug 2013 at 9:14am
|
Here you go Dick. I didn't have anything to do.
XXXOOO's
http://s1357.photobucket.com/user/SF_Fan1/media/Picture2027-vi_zps110f85d3.jpg.html" rel="nofollow">
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Posted By: mjbower
Date Posted: 04 Aug 2013 at 6:43pm
| thanks everybody i think ill stick with .100 off from it to play it safe. |
Posted By: Dick L
Date Posted: 08 Aug 2013 at 9:23pm
I took .200 off with no problems. |
Posted By: Ken(MI)
Date 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 |