| | 16hp Briggs and Stratton opposed twin shaving the head | |
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243generallee New Member
Age : 26 Join date : 2013-01-02 Points : 4302 Posts : 5 Location : Lincoln,Vermont
| Subject: 16hp Briggs and Stratton opposed twin shaving the head March 5th 2013, 3:59 pm | |
| im working at a milling shop now and i am using the mill and would like to shave the head on my racing lawnmower motor im not sure how many thousandths i should take off so i dont blow a head gasket or break the heads of the head bolts off can someone tell me whats the best amount to take off? | |
| | | Marines2621 Member
Age : 27 Join date : 2012-12-31 Points : 4535 Posts : 215 Location : Mountainburg, Arkansas
| | | | Marines2621 Member
Age : 27 Join date : 2012-12-31 Points : 4535 Posts : 215 Location : Mountainburg, Arkansas
| | | | Chopperhed Moderator
Age : 58 Join date : 2012-10-14 Points : 5206 Posts : 801 Location : Edmonton, Alberta, Canada Eh!
| Subject: Re: 16hp Briggs and Stratton opposed twin shaving the head March 5th 2013, 10:46 pm | |
| Start at .005" and see what happens, measure the depth of your stud holes to make sure you can get proper clamp.
On OHV engines if you take too much you may have to mill the pistons to allow for valve clearance.
On Flatheads, the problem is similar and different at the same time. you need to open up the area above the valve to allow for flow and valve clearance. | |
| | | Chopperhed Moderator
Age : 58 Join date : 2012-10-14 Points : 5206 Posts : 801 Location : Edmonton, Alberta, Canada Eh!
| | | | Thunderdivine Veteran Member
Join date : 2012-12-21 Points : 6495 Posts : 2101 Location : Norway, Europe
| | | | Guest Guest
| Subject: as opposed to shaving the head April 2nd 2013, 12:47 am | |
| One could also use a small die grinder (dremel etc) to put the 'fire slot' into the heads of the briggs flatties. I use that trick rather than shave heads. Doesn't up the compression but allows for a much better spark to be funneled to the combustion chamber (since there is a slight but noticeable offset between combustion chamber and spark plug location on the flattie). With a tuned carb and a good hot spark (I use E3 plugs for such a mod) one can gain a hp or more doing it, sometimes even more than that depending on other mods, fuel/additives used etc.
I understand now it's an aftermarket thing for smaller briggs engine mods, but its much easier to do it yourself (and a heck of a lot cheaper). Just use a copper gasket (or get the material and make your own like I do) and you're off and running... |
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