timing 16 degrees advance is that crazy
Ok i have a 1.6 short nose i bought used.
IT has a Bipes timing retarder. I checked my timing in the correct procedure and it reads 16 degrees advance. I was concerned about the keyway being shoot. So I took off the valve cover and pulled the plugs put a dowel in #1 and spun the crank. It is hard to determine tdc because it seems like it as at the top for a couple of degrees, but it appears the tdc mark is correct or at least with in 2%. Is it possible 16% advance and bipes pulling timing is the way the old owner had it set. I changed the timing to 10 and it runs like crap and even miss's a little some times at 3-4k rpm as bipes pulls timing. I am really just trying to get timing 100% right for my upcoming MS diypnp install. Please Help Also I check compression at the same time 1= 195 2=190 3=185 4=200 all warm with no oil added and throttle open. Is that ok? |
It did not have any pinging or detonation as far as I could tell the old way it was set up and my other budy whos dad has a miata he helped tune and heard detonation before the dyno showed it at begi drove it and did not hear any pinging.
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Did the balancer slip, giving you an incorrect timing light reading?
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can that happend and how to I tell. I figured since the mark on the pully and the marks on the cam gears matched up both saying top dead center it was on correct.
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1 Attachment(s)
Put the engine at TDC, then make the little tick mark in the pully match with the TDC mark at the plastic "gauge".
https://www.miataturbo.net/attachmen...ine=1326415040 Bingo: http://www.miata.net/garage/hsue/crank/tdc2.jpg |
Originally Posted by 90 Turbo
(Post 819313)
can that happend and how to I tell. I figured since the mark on the pully and the marks on the cam gears matched up both saying top dead center it was on correct.
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this is how I check for TDC
take all the plugs out place the oil dip stick through the plug hole for #1 cylinder [the one in the front] BEING CAREFUL NOT TO SCRAPE the top of the piston or the cylinder wall!!! rotate the crank with a socket wrench until the dip stick stops rising don't rotate the engine backwards, puts stress on the exhaust lobes check the timing mark to the reference pointer |
OK. I took off the valve cover but a screw driver in the #1 and rotated the crank clock wise. The screw driver would get to its highest point around 2% to tdc on pulley in pics above. The valve gears i and e with the arrow looking marks above The I and e on the gears where pointing straight up. So that leads me to believe the lower cam gear and pulley are in synce with the cam. Is that right you think. Like I said the screw driver was at its highest point for about 2% of rotation.
So if it is set right would 16 advance be crazy with the bipes pulling timing at 2800 less to 3500 where it pulls upto 12 degrees? Again i never heard a ping or anything. And it def misses and bogs now with it set at 10 from 3500-4900rpm. Again i am swapping to ms the weekend after this so i dont need it to run good now but i want the timing set right so all my adj and maps in MS have are from a correct starting point timing wise. Thanks again for the replys. |
Changed it back to 14 and now no issues 3-4k rpm.
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