Did I get screwed

[zooguy]

Help .... is this right?

I took my motor and had it put on an engine Dino and they said the intake valves were opening up 4 degrees pass stopped dead center and should be around 30*

They told me it was a mis alignment of the timing chain ... Top Gear and bottom gear only go on one way and only have one Mark

Wtf .... cost me $1160 and I still don't know what's wrong

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[Fastbird]

If they were running it on an engine dyno HOW did they know the valves were opening early without taking it apart? Something doesn't add up. Set up as your picture shows you should be at #6 TDC. If you were 180° out on #1 TDC then the car wouldn't be running.

If you have a cam card you could degree the cam in and see what happens. It's possible it was a misground cam.

How was it running before?

[firebird_1995]

Been beating on this on lt1 nation. Basically what we've said was, if when the cover was pulled it was in that position and they were measuring off the #1 valve, they are incorrect in what they found on the degreeing.
The shop was saying it was backfiring through the carb, tried another carb and did the same thing. More than likely the backfiring through the carb was just the ignition timing not correctly set.
I don't think he's started yet, which was probably something that should have been done prior to taking it to a dyno, to avoid an issue like this.

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[zooguy]

If they were running it on an engine dyno HOW did they know the valves were opening early without taking it apart? Something doesn't add up. Set up as your picture shows you should be at #6 TDC. If you were 180° out on #1 TDC then the car wouldn't be running.

If you have a cam card you could degree the cam in and see what happens. It's possible it was a misground cam.

How was it running before?

it has never run before ... its a fresh build and never started ... i wanted to have the dyno do the initial break in and seat the rings under a load then tune it once it was broke in

so now something i can check ... with my timing chain how it is ... how should the rotor point if i pull the distributor cap off ?

[Camaro96]

Help .... is this right?

I took my motor and had it put on an engine Dino and they said the intake valves were opening up 4 degrees pass stopped dead center and should be around 30*

They told me it was a mis alignment of the timing chain ... Top Gear and bottom gear only go on one way and only have one Mark

Wtf .... cost me $1160 and I still don't know what's wrong

http://uploads.tapatalk-cdn.com/20161204/383b1035797b3c817a8c4f3fc231c218.jpg

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When I look at your post the timing marks are in the correct position. The only thing I can think of is that the number 1 cylinder was not at top dead center on the compression stroke. When the timing set was installed. I

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[zooguy]

When I look at your post the timing marks are in the correct position. The only thing I can think of is that the number 1 cylinder was not at top dead center on the compression stroke. When the timing set was installed. I

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how is that possible?

[Camaro96]

zooguy In a conventional four stroke engine. There are four cycles intake, compression, power, and exhaust. If when the timing chain was installed when the piston ws at TDC on the exhaust stroke instead of the compression stroke. The timing is going to be of and cause a backfire thru the exhaust. ( engine should not run if this occurs.)


I can not tell in the picture that's posted if the dowel pin on the cam shaft is in the 3 o'clock position.

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[Camaro96]

Will you be run an opti? I know for the dyno they were running a carb and distubuter in the back of the manifold. Did you degree the cam upon installation? To make sure the cam card matched the cam you received? In case you received the wrong cam?

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[Spartan7]

Wait, are you running an opti or a conventional distributor? Because that will change things. You can't screw up an opti regarding #6 or #1 TDC, but you CAN screw up a dizzy.

[zooguy]

@zooguy (http://ltxtech.com/forums/member.php?u=2003) In a conventional four stroke engine. There are four cycles intake, compression, power, and exhaust. If when the timing chain was installed when the piston ws at TDC on the exhaust stroke instead of the compression stroke. The timing is going to be of and cause a backfire thru the exhaust. ( engine should not run if this occurs.)


I can not tell in the picture that's posted if the dowel pin on the cam shaft is in the 3 o'clock position.

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dowel is at the 3 o'clock

[zooguy]

Wait, are you running an opti or a conventional distributor? Because that will change things. You can't screw up an opti regarding #6 or #1 TDC, but you CAN screw up a dizzy.


no more opti

[Camaro96]

zooguy since your running a conventional distubuter. The dowel pin dose not matter it is used to drive the opti spark. With the conventional disubter. Then timing is done just like the gen 1 small block.

Have you checked to see if the rotor is setting on number 1 cylinder when you bring it up on TDC during the compression stroke?

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[firebird_1995]

it has never run before ... its a fresh build and never started ... i wanted to have the dyno do the initial break in and seat the rings under a load then tune it once it was broke in

so now something i can check ... with my timing chain how it is ... how should the rotor point if i pull the distributor cap off ?
With the timing set in the position it's in, you are on #6 tdc of the compression stroke. Your rotor should be pointing at the #6 terminal on the cap. If its pointing to #1 you are "180 out" as in the timing is trying to fire the #1 plug when it should be firing the #6. If this is the case, pull the distributor out, rotate 180°, and drop it back in. Then call up your she and ask them why they started chasing cam timing before checking ignition timing. Pretty basic shit imo

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[BALLSS]

On a rear distributor motor, backfiring through carb and no start is almost always 180 degrees out

you need to have #1 on compression stroke and the rotor pointing to #1 or #6 at TDC compression and rotor pointing to #6

[zooguy]

https://vimeo.com/194268787

Well it doesn't look like it's 180 degrees out of time

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[popo8]

Video wont show for me... what is it a video of?

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[firebird_1995]

His video shows the rotor pointing at the #6 terminal, so the distributor is in correct. You're going to have to put some effort into getting it going, it's not like efi where everything is set where you tell it to be.

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[Injuneer]

http://shbox.com/1/4th_gen_tech2.html#cam_timing

[Camaro96]

I watched the video you posted on FB. When you done away with the LT1 2GEN time and all you need to do is set the time like you would a Gen 1 engine. Bring number one cylinder up on top of compression stroke. You will be able to hear the piston push air out the number one spark plug hole. From the video I believe that you will find that the rotor cap will be pointing at cylinder number 6 if that the case. Loosen up your disubter and lift it up and rotate the rotor and timming gear so the rotor cap is at cylinder one. Then fasen down the distubuter and check by rotating the crankshaft until you get the compression stroke on cylinder number one. Then look and see if the rotor is pointing at cylinder number one, and then look at the cam gear and sprocket gear and timing marks are lined up.

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[Spartan7]

...

The video shows he did exactly that. The distributor appears to be clocked right, now you just have to set up the timing. Which I would think the dyno shop would be familiar with? Do you have an aftermarket timing pointer on the front cover? Because you're going to need that to dial in the advance with a timing light.

[MoeHorsePower]

Did the shop even try to rotate the dizzy to try and get it started? backfiring thru the carb is usually retarded timing not advanced. if its so advanced, then it will sound like the engine is trying to lock up when cranking, like way too much compression., Hard to explain..

[popo8]

Can u contact the person whom u purchased the cam from and ask if there was any advance ground into the cam that u are not taking into account?

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