Crate engine swap advise please?

[350runner]

Yea it really is. Thanks dude.

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[73 C10]

I went for a drive. About 40 miles round trip. The engine felt good, and sounded good except I can feel an acotional miss light footing it up to 45.

On the way back, 10 miles down hill and 10 miles of flat on the hwy., 65-70f. When I got back on the surface streets the spark knock was very noticeable on power leaving stops. The exhaust sounded a bit tinny.

The next morning I checked the base timing and it had not moved. In hindsight I did the wrong thing I think. I added two notches to the spiral va limiter. It looked to be at ~15* of va on the crank. I set the base to 12-13 BTDC. It's hard for me to read the deg. Because I have not figured out how to mark my balancer sutch that a mark is ever on the tab. My tab goes from -12 - 10. -16* is off the tab so it's a bit of a guess. Then I guesstimate the va by watching how far a rusty spot moves across the tab, and then trust that the mechanical is what the spec says.

I also got the 6857 rod and put it in.

It still rattles under heavy foot power.

So I think that leaves me with the timing a bit retarded. Why would I get spark knock then? Low octane gas? Lean on power?

 

[MadOgre]

Sounds like to much timing to me. Did you rule out all the other reasons for spark knock that Ceasar posted on that link ?

You should get an adjustable timing gun.

 

[73 C10]

I think from what I've been told, read and tried, it sounds like to much timing. But the base is stock -12 and the va I limited. And I haven't done anything with the mechanical. I don't have feel for the va diaphragm adjustment. I just know that when set at the starting point given in the paperwork, the va was 0*. I felt I had to adjust it 7 turn clockwise to work.

As for everything on the list? Rich says my plugs could be hotter if I remember right. So that rules that out. I'm running the setup Rich advised on the carb. I just put the rod he suggested. So I don't know about the lean condition. He does have me leaned out from stock on the power part of the needle.

 

[MadOgre]

I think from what I've been told, read and tried, it sounds like to much timing. But the base is stock -12 and the va I limited. And I haven't done anything with the mechanical. I don't have feel for the va diaphragm adjustment. I just know that when set at the starting point given in the paperwork, the va was 0*. I felt I had to adjust it 7 turn clockwise to work.

As for everything on the list? Rich says my plugs could be hotter if I remember right. So that rules that out. I'm running the setup Rich advised on the carb. I just put the rod he suggested. So I don't know about the lean condition. He does have me leaned out from stock on the power part of the needle.

Are you at sea level? If so you need to be richer not leaner!

With lean settings any little bit of slag or sharp edge in any of your combustion chambers on the heads can cause pre ignition. The sharp little edges will glow hot like a glow plug and cause pre ignition. If you have a proper air/fuel mixture you will not have this problem.

 

[73 C10]

The 6857 needle looks pretty far left on the chart to me, and Rich discussed this earlier in this thread. Stock is 7547 I think. Rich said this was his best guess without a AFR meter.

I'll get an adjustable light.

Altitude is 164 ft.

 

[350runner]

One thing you do not ever want to do is go lean when advancing the engine timing. In many cases when power timing an engine you will need tip step up and go Rich a little. No pun intended...
Please read that link that I posted. Understand when making timing adjustments that you make them a little at a time. In the last thread I posted a very good combo that is safe. I understand you have chosen tip take other advice and I understand... Your spark knock could now have turned into ruined rod bearings or maybe it's still an issue that can be resolved via fuel enrichment or timing adjustment. I wish you well on this endeavor.

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[MadOgre]

The 6857 needle looks pretty far left on the chart to me, and Rich discussed this earlier in this thread. Stock is 7547 I think. Rich said this was his best guess without a AFR meter.

I'll get an adjustable light.

Altitude is 164 ft.

What jets ? and what Rods do you have in there now ?

 

[MadOgre]

Follow the chart you have for the 1406 start with #2/3 if that doesn't work go to #23 if that seems to much then go with #24 if that seems to go back to far then do #25 if that's not enough try #18 and finally #19

What ever you do stay going gradually in the top right direction. Do not go in any other direction. The guys at Edelbrock are not that helpful either. I followed there suggestions, and my truck ran like crap! I then went with the chart and it runs very well now! The chart is the way to go. If you need to get in between #s then do the math and split the difference.

 

[rich weyand]

Whoa. Stop. Make sure your timing marks are accurate and you are timing it correctly before you go changing everything in sight or you will end up chasing your tail. This -- "It's hard for me to read the deg. Because I have not figured out how to mark my balancer such that a mark is ever on the tab." -- does not inspire confidence.

You need to find TDC on #1 piston and make sure your timing marks are correct before you do anything else. In the meantime, you can back off the timing to 4, 6, 8 degrees to kill the knock so you can drive it around.

 

[MadOgre]

Whoa. Stop. Make sure your timing marks are accurate and you are timing it correctly before you go changing everything in sight or you will end up chasing your tail. This -- "It's hard for me to read the deg. Because I have not figured out how to mark my balancer such that a mark is ever on the tab." -- does not inspire confidence.

You need to find TDC on #1 piston and make sure your timing marks are correct before you do anything else. In the meantime, you can back off the timing to 4, 6, 8 degrees to kill the knock so you can drive it around.

Yes but at Sea level there is absolutely no way he should be in the lean side for any reason.

 

[rich weyand]

He's not lean, MO. I am at 600 feet above sea level, and I set my mixture to the numbers with an A/FR meter. 12.5 on secondaries, 13.5 in power and 14.25 in cruise is not lean, no matter what the Edelbrock charts say. The issue is that the 1406 mixture charts may be fine for hot rods or whatever, but apparently aren't set up for a torquer engine that pulls 19" of vacuum at idle.

He needs to be able to know what the heck his timing really is, and I still recommend getting an A/FR meter.

 

[350runner]

Rich,

He is lean if he is getting spark knock. Pinging is too much timing. Spark knock is too low of an octane rating or too lean of an A/F mix.

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[MadOgre]

Well it all depends on what jets are in it? And yes the Timing definitely needs to be accurately dialed in.

 

[MadOgre]

He's not lean, MO. I am at 600 feet above sea level, and I set my mixture to the numbers with an A/FR meter. 12.5 on secondaries, 13.5 in power and 14.25 in cruise is not lean, no matter what the Edelbrock charts say. The issue is that the 1406 mixture charts may be fine for hot rods or whatever, but apparently aren't set up for a torquer engine that pulls 19" of vacuum at idle.

He needs to be able to know what the heck his timing really is, and I still recommend getting an A/FR meter.

You both have the same Cam? Where did I miss this ?