mikey4410 Posted March 25, 2015 Share Posted March 25, 2015 (edited) heya guys, so tonight i got home and checked my timing.removed rocker cover etc as my mechanic friend said it maywell be out a bit..... lined all the relevant markings up and this came to light on the cams....................tooth out on cams soooooo i went about correcting it, as above its all now lined up CORRECTLY. have yet to see what compressions like but my mechanic friend has said despite it being just one tooth it should make a difference. does seem to rev up alot quicker on the throttle , hopefully this sorts things Edited March 25, 2015 by mikey4410 Quote Link to post Share on other sites
daniel_g Posted March 25, 2015 Share Posted March 25, 2015 You fooooooool!! Quote Link to post Share on other sites
mikey4410 Posted March 25, 2015 Author Share Posted March 25, 2015 ahh dont.cant believe it was wrong.but will it make a difference.... im looking forward to driving it. Quote Link to post Share on other sites
abbott Posted March 25, 2015 Share Posted March 25, 2015 Will defently make a differance chap i know from experiance Quote Link to post Share on other sites
mikey4410 Posted March 25, 2015 Author Share Posted March 25, 2015 abbott has similar happened to ureself ?? starlet or other car ? Quote Link to post Share on other sites
jayc-glanza17 Posted March 25, 2015 Share Posted March 25, 2015 Compression test and report back tomorrow mikey.I agree with Abbott as had it myself on my stock original 4e. Quote Link to post Share on other sites
akyakapotter Posted March 25, 2015 Share Posted March 25, 2015 Mine was a took out and it was horrible to drive I could hardly pull off lol Quote Link to post Share on other sites
mikey4410 Posted March 25, 2015 Author Share Posted March 25, 2015 potter all I can think is that it was the opposite way wrong to mine as mine "drives fine".started hot or cold.reved up.afrs fine.and all the rest of it.I am looking forward to driving it tommorow to see if theres a difference. Quote Link to post Share on other sites
akyakapotter Posted March 25, 2015 Share Posted March 25, 2015 I was a tooth in front of the dot on the head was a pain lmao hopefully yours will be fine now Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 (edited) I have worked out on my car that the inlet valves would have remained open a fraction longer than it should as my inlet timing was "LATE" on the compression cycle .this would obviously lead to a small amount of compression/ air and fuel to be lost and put back into the inlet system which isnt great. lol. Edited March 26, 2015 by mikey4410 Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 (edited) f found this as doing research and bored at work... remember I believe my inlet valves opening late and shutting late .The point that the intake valve goes closed has a large effect on cylinder pressure. When the piston is traveling back up the cylinder, it will force some of the fuel/air mixture past the still open intake valve into the intake port. If the intake valve closes later in the cycle, some of the fuel/air mixture will be forced past the intake valve into the intake port, which will reduce cylinder pressure.The point in the cycle where the intake valve opens is very important. If the intake valve opens too late in the cycle, the initial amount of fuel/air mixture draw into the combustion chamber is reduced and spent gasses will not be effectively flushed from the chamber. Edited March 26, 2015 by mikey4410 Quote Link to post Share on other sites
decdd19 Posted March 26, 2015 Share Posted March 26, 2015 Worth a shot to get you timing checked then? Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 yeap all timings fixed as it explains above.just gota do a compression check tonight. Quote Link to post Share on other sites
decdd19 Posted March 26, 2015 Share Posted March 26, 2015 Ah good best a luck hope it was a simple fix like that Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 (edited) thanks decdd,me to.already drives better so I am hopefull :-D Edited March 26, 2015 by mikey4410 Quote Link to post Share on other sites
AdamB Posted March 26, 2015 Share Posted March 26, 2015 The point that the intake valve goes closed has a large effect on cylinder pressure. When the piston is traveling back up the cylinder, it will force some of the fuel/air mixture past the still open intake valve into the intake port. If the intake valve closes later in the cycle, some of the fuel/air mixture will be forced past the intake valve into the intake port, which will reduce cylinder pressure.The point in the cycle where the intake valve opens is very important. If the intake valve opens too late in the cycle, the initial amount of fuel/air mixture draw into the combustion chamber is reduced and spent gasses will not be effectively flushed from the chamber. That's not true mate, look at the cam specs of the E series and you will see that the valve closes at 42 degrees ABDC, so the piston is already coming up the bore. The reason behind this is because the mixture can continue to plough in the cylinder, more air = more fuel required = bigger bang. Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 well those are just quotes from something I found online. Quote Link to post Share on other sites
AdamB Posted March 26, 2015 Share Posted March 26, 2015 Don't believe everything you read online I've got some good engine test data I did here when I was last in the engine test cell with a BMW Mini Turbocharged engine if it would make for some educational reading if you wanna take a look? Obviously the engine is different but the principles are the same. Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 so u reckon my compression will still be at 150 even though my timings now correct ?? Quote Link to post Share on other sites
AdamB Posted March 26, 2015 Share Posted March 26, 2015 (edited) It might well change, but not because of the reasons you mentioned. The reason being is that the overlap period had been changed. What you have found with your motor is that opening and closing the intake valve later alters the engines power spread, have you looked at other dyno graphs of those running the same turbo and same boost? Compare the low-mid range as you might find that your low top end power is because it's been sacrficed for the mid range power. Dwelling on it a little longer, an N/A engine may well push air back out the inlet valve, however that would be a case of an engine with a volumetric efficiency below 100% and a poorly designed inlet tract where airflow doesn't reach the correct velocity, Edited March 26, 2015 by AdamB Quote Link to post Share on other sites
5e colin Posted March 26, 2015 Share Posted March 26, 2015 compression will be higher now !!!! cheap fix ha ha Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 so anyway the bits that I found online were spot on and correct.my compression ratio is now 170 over all four !!!!!!!!!!very happy and thanks for all helpful inputs and advice.much appreciated. Quote Link to post Share on other sites
akyakapotter Posted March 26, 2015 Share Posted March 26, 2015 so anyway the bits that I found online were spot on and correct.my compression ratio is now 170 over all four !!!!!!!!!!very happy and thanks for all helpful inputs and advice.much appreciated.Sweet glad you checked before ripping it all apart Quote Link to post Share on other sites
mikey4410 Posted March 26, 2015 Author Share Posted March 26, 2015 170 baby !!!! so chuffed and car pulls hard as fook now Quote Link to post Share on other sites
akyakapotter Posted March 26, 2015 Share Posted March 26, 2015 i set my timing on the mark inbetween the 10 and the 0 same as my other engine Quote Link to post Share on other sites
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