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  1. rich weyand

    Crate engine swap advise please?

    This is very important to get correct. Play with it with your vacuum pump and gauge until you get it correct. If you are holding VA in all the time, you will never be able to tune the engine properly. Remember the spec for the stock AR23 can: 5-7 7.5 @ 11-12.5 - starts pulling in between 5"...
  2. rich weyand

    Crate engine swap advise please?

    Exactly. And that's exactly where I was before I got the meter, and getting 6mpg on top of it. Oh, I wasn't lean! After I got the mixture sorted, I was surprised at how much timing it would take. And timing is like a horsepower adjustment right up to the knock limit. More is gooder...
  3. rich weyand

    Crate engine swap advise please?

    Wait for the meter! You can also bog too rich. Get the numbers first. It'll also bog if his step-up springs are too light or the pistons are stuck.
  4. rich weyand

    Crate engine swap advise please?

    Beats hell out of me. Funny what you learn when you actually get the AFR numbers though. I would never in a million years have thought these needles would be right either, but that gives me the correct AFR across the range. I got the AFR meter after stumbling around with the chart and never...
  5. rich weyand

    Crate engine swap advise please?

    Timing went up and down as they tried to meet pollution standards in different ways. Best performance and best mileage are when timing is as advanced as possible without detonation. Suggestion is to keep the timing lower than optimum until you get the mixture straightened out and nail down the...
  6. rich weyand

    Crate engine swap advise please?

    Yup, now you got it. Exactly correct, except I would say the sweet spot is 36* for a Chevy V8, which is why I like 16+20 (or with 21 mechanical, 15+21) to get 36. Limit the VA to somewhere in the 12-15 range. Stock is, I think, 15. The bog now is in your mixture, I think. Get that meter...
  7. rich weyand

    Crate engine swap advise please?

    You can see the centrifugal advance kick in on the timing light if you have someone slowly rev the engine higher just sitting there in Park. It should be all in before 3000. I wouldn't mess with the mechanical. Part of the problem is you have too many available adjustments as it is. I have...
  8. rich weyand

    Crate engine swap advise please?

    OK, but it's gonna run lean unless you have your foot into it enough for those springs to win against the vacuum and pop up. Running lean is not good. Especially when you are already trying to figure out a knocking problem.
  9. rich weyand

    Crate engine swap advise please?

    And with 19" of vacuum, you want the 8" springs.
  10. rich weyand

    Crate engine swap advise please?

    Understood. What I don't understand is whether the light is showing you difference (VA only) or total (VA + base) the way you are using it. 15* on the crank is what you want.
  11. rich weyand

    Crate engine swap advise please?

    OK, so I re-read this and maybe you are reading the difference. I don't know what light you are using. If you are reading the difference, that is too much VA.
  12. rich weyand

    Crate engine swap advise please?

    OK, so that is not 20 degrees of vacuum advance. That is 8 degrees of vacuum advance, which is probably too little. The following are "terms of art", and what we assume you mean when you use them. "Base timing" is what you read at idle when the VA is unplugged. "Vacuum advance" is what...
  13. rich weyand

    Crate engine swap advise please?

    Yes, that's right. Another issue is that the vacuum advance may come in too soon, keeping you advanced after it should have dropped out. Stock is something like the AR23: "5-7 7.5 @ 11-12.5", which is: Advance starts coming in at 5-7" Hg, and maxes out at 7.5* (camshaft degrees -- 15...
  14. rich weyand

    Crate engine swap advise please?

    ^^^ This. I don't like that your tab and the delay timing light disagree. There's something goofy in all this. Here's my recommendation, reviewing all of the above: 1) Find TDC and get an accurate set of marks on the timing wheel and polish up the tab so you can see WTF your timing...
  15. rich weyand

    Crate engine swap advise please?

    At the crank: 16 base plus 15 VA plus 20 mechanical. On acceleration at rpm, that is 36 (base+mech). That's what MO is talking about. At idle is 31 (base plus VA). At cruise is 51 (base+mech+VA).
  16. rich weyand

    Crate engine swap advise please?

    MO, without a meter reading from him you don't know that. You can't just read their stupid chart, which makes no allowance for displacement or vacuum or anything really except "how far off Edelbrock stock am I?" I'm running 62/52 on a 95 jet, which is same as 67/57 on a 98 jet, and I am dead...
  17. rich weyand

    Crate engine swap advise please?

    Not necessarily the same cam, but he's pulling 19" of vacuum, like me, and that tells a lot about his cam. That's also was the carb is seeing: same displacement, same vacuum, same carb response. That's why I suggested he try my mixture settings. My recommendation remains to buy the meter...
  18. rich weyand

    Crate engine swap advise please?

    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...
  19. rich weyand

    Crate engine swap advise please?

    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...
  20. rich weyand

    A note on carburetor flow capacities

    The topic comes up often: how big a carb should I put on my XXX engine. Bigger cfm numbers -- higher flow capacity -- is always better, right? No. Carburetors approximate the correct mixture for the engine. Exactly correct mixture can only be achieved in a closed-loop system, like...
  21. rich weyand

    Issues

    The Eddy 1406 does not have an internal fuel filter. So you should be able to see a fuel filter in the line from the fuel pump to the carb, usually at the carb end. Do not use a glass filter. I use a metal filter on mine, which you can see in this photo just behind the heater hoses.
  22. rich weyand

    Rattling is driving me insane

    I had a rattle in the transfer case shifter. Turns out the the handle that sticks into the cab is not the actuator in the shifter mech, one is bolted to the other, and one of the bolts had come loose.
  23. rich weyand

    Crate engine swap advise please?

    Remember that crankshaft degrees is double camshaft degrees. That's only about 5 camshaft degrees of VA. I would probably go 7.5 (15 on the crank). If you are getting any knocking, back off two degrees and try again. I don't know what you mean by "bottom end knocking" though. Red line...
  24. rich weyand

    Issues

    Couple questions: Did you change anything else that may be a cause? Have you ever cleaned the step-up pistons and cylinders? They get dirty, and then stick, and then give a hesitation on acceleration. You loosen the two screws on the top of the carb under the air cleaner, swing the little...
  25. rich weyand

    Crate engine swap advise please?

    Shop manual says 80W90 or straight 80W. Is that your recommendation, MO? I have this service coming up....

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