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Posted on Jan 02, 2017
Do not use this piston. We are not taking about thousanths of an inch (which would be bad enough) but hundredths. This would drastically change your combustion chamber volume in one cylinder only. Also the spark plug would fire with the piston further down the bore quit likely leading to detonation in that cylinder and may damage your engine because of it. It may, as you say, also be a balance concern since it may not be within the weight tolerance of the pistons. Simply changing the thickness of a head gasket by thousandths of an inc can make a combustion chamber difference - so as mentioned earlier - hundredths of an inch in one cylinder is not acceptable. Let me know your thoughts. Thanks. This actually was scary for me to read.
Posted on Jan 09, 2011
SOURCE: i have a oz xe 4.1 lt 250 xflow motor which i have rebuilt and put flat top pistons in bored out 60 thou shaved yella terra head 15 thou and has a very mild cam after lining up timing marks the inlet
when setting up the valve timing it is always done on the exhaust stoke.. Place the piston on TDC and set the valve timing so that the exhaust valve is just closing and the inlet is just opening. Rocking the crank a bit before tdc to a bit after tdc will produce a movement where the exhaust starts to close as the inlet starts to open. This is known as valve rock or valve overlap. The cam modification is of no consequence as the as all that is modified is the valve duration , not when they open or close. With the cam now timed to the crank turn the crank 180 degrees and set the ignition timing to the degrees advanced recommended ( 10-12 degrees bftdc is recommended for starting). Place the HT leads in the correct firing order and when running use a timing light to adjust ignition timing. If you are fitting a new cam then you must bedding in grease and when the motor starts it has to be run at around 2.000rpms for around 10 minutes to set (harden) the cam lobes or else they will wear off very quickly.
Posted on Sep 28, 2014
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