lifters bleeding down?? - Team Camaro Tech
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post #1 of 7 (permalink) Old Mar 11th, 03, 05:35 PM Thread Starter
 
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back in august i posted a question about my BB402 and the noise it was making from the rockers(like they were all loose). i have been unable to work on my car untill this past week and still have the problem so i asked a mechanic to come look at it. well he came out and readjusted them and we fired it back up and still have the same noise, he says the lifters are pumping down almost as quickly as he is adjusting them. he thinks it may be a bad set of lifters but is unsure and needs to check with the engine builder to confirm. the cam and lifters are the ultradyne 280/288 and were purchased brand new. my question is has anyone ever heard off ALL the lifters not pumping up or whatelse could be the problem? as always any advise and help will be appreciated
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post #2 of 7 (permalink) Old Mar 12th, 03, 12:38 AM
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Could be a couple reasons,

1. Lifters could have been made to bleed down to reduce the cam duration at idle to allow engine to idle alittle better, as in a Rhoades lifter.
2. Low oil pressure at idle, too thin of oil, worn pump, weak pressure relief spring.
3. Or, too much bleed down from lifters themselves, made wrong, too much clearance inside the outer body, etc.

Call Ultradyne and ask them about the problem at hand. Have all the surrounding circumstances at hand, engine cold, engine hot, at idle, at cruise rpm, etc.

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post #3 of 7 (permalink) Old Mar 12th, 03, 02:18 AM
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If oil pressure is good, I would look at your valve springs. What valve springs are you running and at what installed height?

I saw this happen once before on a 70 Camaro with a 327. The owner had no idea what cam he was running and the valve springs were stock diameter. It turned out that the springs were binding. He didn't figure it out until a couple lobes went flat. Too much valve spring pressure will kill a hydraulic lifter even if the springs are not binding.
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post #4 of 7 (permalink) Old Mar 12th, 03, 05:26 AM Thread Starter
 
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well ive got 60+ psi for the oil pressure and the oil pump is brand new(high volumne), i tried to call ultradyne but nobody has called back yet, the mechanic is getting me some rhoads lifters in and we are going to see if they work. im not really wanting to spend the money on them but he has asked around and most feel that its a bad batch of lifters. i did take my cam card to the machinist who did my heads so i believe the springs should be correct. the mechanic says in 20 yrs hes never seen this before, figures it would be me
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post #5 of 7 (permalink) Old Mar 12th, 03, 05:37 AM
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Are you getting good oil flow up to the rockers. The oil will create a cooling affect on the springs. An old head builder told me he experimented with oil restrictors on an engine once that began to clatter. He found out that the springs had overheated and you could almost compress them with your fingers.

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post #6 of 7 (permalink) Old Mar 12th, 03, 02:05 PM
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marosss,
The Rhoads lifters will definitely be noisy. Every set I have ever heard made a racket. That is the way they are designed. Why don't you wait till Harold calls you back about your UD lifters, they might be a fast bleed type lifter like the Rhoads and that is why they are noisy. If you want to do anything, replace them with a set of good stock lifters.

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1971 Chevelle "Heavy Chevy" original owner


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post #7 of 7 (permalink) Old Mar 23rd, 03, 06:28 PM Thread Starter
 
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bill, is it possible that i need long slot rockers with that cam? i had a mechanic friend suggest that it might be a possibility. just trying to figure on what direction to go before i buy new lifters.
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