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Do i time a 2.7 on compression stroke or exhaust stroke

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All cars are on compression stroke #1 t.d.s.

Posted on Apr 01, 2015

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Posted on Jan 02, 2017

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Firing order for rocam1.6


A six cylinder in-line engine has a power impulse every 720 degrees/6 i.e. 120 degrees of crankshaft rotation. The crankshaft has six crank-throws placed at 120 degrees out of phase with one another, which can be arranged only in three planes. Therefore, the crankpin phasing is arranged in pairs. For heavy-duty diesel engines, seven journals and bearings are provided, at each end and between adjacent crankpins. For petrol engines only 4 or 5 main journals are provided. The firing order with the crankshaft arrangement shown in the attached figure is considered. With piston 1 at the top of the compression stroke, its opposite piston 6 is at the top of its exhaust stroke. Rotation of crankshaft through 120 degrees brings pistons 2 and 5 to their TDC and either one of these can be arrangement to complete a compression stroke. If piston 5 is arranged to be at the end of compression and at the start of its power stroke, then piston 2 must be on its exhaust stroke. Rotation of crankshaft through second 120 degrees positions pistons 3 and 4 at the TDC, so either one of these can be on the compression stroke. If piston 3 is made to be on compression, piston 4 must be on its exhaust stroke. A third rotation of 120 degrees brings pistons 1 and 6 back again to TDC, where piston 6 is arranged to be on the compression and piston 1, therefore, be on its exhaust stroke. A fourth 120 degrees rotation brings pistons 2 and 5 to their TDC. Piston 2 is now on its compression and piston 5 on its exhaust stroke. Rotation of crankshaft through fifth 120 degrees brings piston 3 and 4 to TDC. Piston 4 is on compression and piston 3 on its exhaust stroke. Final rotation of 120 degrees completes the 720 degrees displacement of crankshaft and brings the pistons into positions for the next cycle. This cycle provides a firing order of 1, 5, 3, 6, 2, 4. If the phasing of paired crank-throws 3 and 4 and 2 and 5 are interchanged, then a second equally suitable firing-order of 1, 4, 2, 6, 3, 5 is achieved. This arrangement provides excellent dynamic balance and evenness of torque, and is preferred for engines larger than 2.5 liters provided length is not a prime consideration.

Sep 28, 2016 | Cars & Trucks

1 Answer

On a ram 1500 if I turned the pulley number of time and sstopped the groove at TDC but not in cylinder 1 position will the truck run bad or the timing offset?


the timing mark indicates where the no 1 piston is in the bore. It can be at tdc compression stroke (firing) or at tdc exhaust. If it is on compression stroke ( test by removing no 1 plug and feeling the pressure under your thumb) then the rotor button will be pointing to no 1 HT lead in the distributor cap. If it is on exhaust stroke the rotor button will be 180 degrees from no 1 ht lead . It it is point to no 1 HT lead on compression stroke the truck will start ___IF YOU HAVE THE CORRECT FIRING ORDER FOR THE ht LEADS ) and if it is 180 degrees out it will not start. If it starts and runs but backfires then you will have the firing order wrong on 2 leads

Jan 16, 2015 | Dodge Ram Cars & Trucks

2 Answers

After top dead center what valve starts opening number 1 intake or number 1 exhaust?


It depends on which TDC you are talking about, compression TDC or exhaust TDC. On the compression stroke, no valves will open after TDC-this is when combustion has occured, the power stroke. When the piston reaches bottom and starts up on the exhaust stroke, then exhaust valve will open. At TDC of exhaust stroke, exhaust valve will be closed, and the intake valve will then open as piston is moving down.
If you have the intake valve opening right after TDC, you are on the exhaust stroke of that cylinder. The exhaust valve is only open during upward movement of the piston on the exhaust stroke. Immediately after TDC of exhaust stroke, the intake will open as the piston travels downward.

Mar 04, 2014 | Mitsubishi Cars & Trucks

1 Answer

1987 toyota 22re. head was taken off by siomeone who did not mark or align anything. I need to know how to get it on the compression stroke.


With the head off, the bottom end doesn't know compression from exhaust from squat. The crank just keeps pushing the pistons up and down. You set the #1 cylinder at the top of travel, the mark on the pointer scale must be at zero, then when you have the head on with the camshaft sprocket on its mark, and the timing belt or chain on, you should be at TDC on the compression stroke. To verify, both valves on #1 should be closed-the camshaft lobes for #1 should be more or less pointing up-away from the valves.
See? The valve train is what determines compression stroke vs. exhaust stroke. On compression, both valves are closed. On the exhaust stroke, the exhaust valve will be open. As long as you get the camshaft sprocket on the right mark and the crank sprocket at zero-or on its mark-the timing should be right.

Jan 20, 2014 | Toyota Pickup Cars & Trucks

2 Answers

98 cabrio 2.0 trying to find top dead center.have compression on both revolutions of cam


Of the cam? Is that a typo, because you want to be thinking the crankshaft. The crank turns two revolutions for every single revolution of the cam, the compression stroke and the exhaust stroke. You want to find TDC of the compression stroke. Unless your timing is really messed up, you should have NO compression on the exhaust stroke. The exhaust valve should be open as the piston comes up to TDC on the exhaust stroke. On the compression stroke as the piston starts to rise, a finger over the spark plug hole, you should feel a bit of pressure, and then just turn the crank on around to the zero mark-TDC. Now your cam sprocket should be on the mark, if timing is correct.
Good luck. I have a minor emergency, have to leave, but if you post back needing any more help or questions, I can answer in about 6-8 hrs. Lots of top-notch experts on here-some excellent mechanics. I'm just an old shade tree mech, so I don't get a lot of feedback-hint, hint. lol

Aug 02, 2013 | Volkswagen Cars & Trucks

1 Answer

Step by step instructions on timing belt installation 2000 hyundai accent


Right, so you have two TDC's-the exhaust stroke and the compression stroke Top Dead Center-and both occurr when the crank hits the zero mark on the timing scale.
Always set timing with the number one cylinder at TDC on the compression stroke. How do you know which is which? If you have a distributor, the rotor will be pointing to number one cylinder tower, when at TDC of the compression stroke. If you are on the exhaust stroke's TDC, the rotor will be pointing just opposite of number one .
If you don't have a distributor, look at the valves for cylinder one under the valve cover. If at TDC of compression stroke, both valves will be closed. At TDC of exhaust stroke, the exhaust valve will be open.
You can also find the compression stroke on number one by pulling out the spark plug for number one, and either put a wrench or socket on the crank pulley and turn it clockwise, or use the starter and bump the engine over in short bumps. Put your finger or thumb over the spark plug hole and feel for the pressure to build up. As soon as you feel pressure on your finger, (if turning by hand, pressure will be slight, but you can feel it) you are on the compression stroke. Stop bumping the starter and turn the crank on around by hand until the zero mark lines up on the timing scale-TDC of compression stroke! The exhaust stroke will have no pressure build-up as the piston comes to top-because the exhaust valve is open. On the compression stroke, both valves are closed as the piston travels up the cylinder.

Dec 07, 2012 | Cars & Trucks

1 Answer

Overbored a cl175 50 thousands .cant get it timed.acts like it is out 180.


You're wrong. It should not fire when the exhaust valve is open-that is the exhaust stroke. As the piston moves down after the exhaust stroke, the intake valve opens and the air-fuel mixture is pulled into the cylinder. Then piston travels up, compressing the mixture( both valves are closed, now), and at the top of this stroke the ignition fires, driving the piston down.
Sounds like your timing is a bit too soon, if it's firing when the intake is open. Try retarding the time just a bit.
If that doesn't work, find tdc of the compression stroke of number one cylinder: pull the sparkplug out and turn the crank around by hand (with a socket on the crank pulley) with your finger over the plug hole. As the crank comes around to the zero mark (TDC), you will feel pressure bui;ld up on your finger if you are on the compression stroke. If you are on the exhaust stroke there will not be pressure buildup as the piston approaches TDC. Once you have number one cylinder at TDC of the compression stroke, the rotor will be pointing to the number one plug wire tower on the distributor cap. If the dist. is off 180, rotor will be pointing opposite of number one.

Nov 01, 2012 | Cars & Trucks

1 Answer

What does the cam sensor do?


It sends a signal to the Powertrain/Engine Control Module (ECM or PCM) so that the control module knows when to fire the fuel injectors.

Each cylinder in a 4-stroke engine reaches top dead center in its travel 2 times for every time the cylinder fires. Once on the compression stroke and once on the exhaust stroke. The ignition and fuel injector timing is based off of the position of #1 cylinder. If the computer knows what position #1 cylinder is in, then it can accurately calculate what position all of the other cylinders are in. The crankshaft position sensor (CKP) tells the controller when #1 cylinder is at top dead center. The cam position sensor (CMP) tells it if #1 is on the compression stroke or the exhaust stroke. With the data from these two sensors, both injector and ignition timing can be acurrately controlled.

I hope this helps you to understand.

Mar 24, 2012 | Ford Escort Cars & Trucks

2 Answers

Making sure i'm on the compression stroke


Hi,
The compression stroke is when the piston is traveling UP and the intake and exhaust valves are both closed.

Intake: Piston going down, intake valve open, exhaust valve closed
Compression: Piston going up, intake and exhaust valves closed
Power: Piston going down, intake and exhaust valves closed
Exhaust: Piston going up., intake valve closed, exhaust valve open

Mar 16, 2011 | Toyota Tacoma Cars & Trucks

2 Answers

Explain the four stroke cycleof a three cylinder


Is this a quiz? Each cylinder contains one piston that takes four strokes to coplete a a full cycle. the intake-down,compression-up, power-down, exhaust -up.
A two stroke has up and down only . Compression and power Now, I thik you really meant the firing order. I'm not sure but Would make sense 2-3-2?

Nov 18, 2009 | 1995 Isuzu Rodeo

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