Did I get screwed

**zooguy** · 12-03-2016, 06:06 PM

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*** · 12-03-2016, 06:32 PM

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** · 12-03-2016, 08:54 PM

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** · 12-03-2016, 10:55 PM

Originally Posted by 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?

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** · 12-03-2016, 11:19 PM

Originally Posted by 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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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** · 12-04-2016, 12:01 AM

Originally Posted by Camaro96

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** · 12-04-2016, 12:27 AM

@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** · 12-04-2016, 12:32 AM

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** · 12-04-2016, 04:43 AM

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** · 12-04-2016, 04:48 AM

Originally Posted by 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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dowel is at the 3 o'clock