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  #16 (permalink)  
Old 11-13-2012, 10:14 PM
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OK, so currently we have 795.56 cc's in the cylinder, 2.12 cc's in the piston deck height, ~64 cc's in the chamber, 9.1 cc's in the gasket and 6.0 cc's in the piston crown. Total- 876.78 cc's. Less cylinder cc's- total 81.22 cc's. Divide 876.78 by 81.22 and find 10.795:1 static compression ratio. Intake valve closes at 42 degrees after bottom dead center, yielding a DCR of 9.143:1 on the KB calculator. So, yeah, I suspect it sounded like a coffee can full of marbles.

Keep the cam and all else except the pistons. Change 'em out for some 18cc dish pistons. SCR will be 9.70:1 and DCR will be 8.23:1. And everyone will live happily ever after.

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  #17 (permalink)  
Old 11-14-2012, 04:53 AM
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Huh so the Summit cam won't work. Now its back to changing the pistons. I have looked at Summit and Jegs for pistons and they both only offer 12cc dish pistons in the Speed Pro range. Im not really wanting to spend $600 plus for pistons. Though I will if I have too. Where can I get 18cc dish pistons?

I also think my CR is a little bit higher because I had the Edelbrock heads resurfaced on the last rebuild, because they had been on 3 previous builds and my machinist recommended it.

Cdminter I bought the Comp K-kit. So I used the proper springs and lifters. I did check the install height and it was correct. I also am using .100 longer pushrods for the Edelbrocks. I remember when I put them on my stock 350 I was pissed because I didn't know about the pushrods and had to wait 5 days for them to come in the mail. And then 388 was run periodically during the 8 years just not everyday.

This engine ran perfect when I first installed it back in April of 2004. I did a full rebuild because I got promoted at work and was going to be driving more. But I went and bought an 02 Camaro SS in Nov of 2004, so the Caprice sat in the garage ever since. Its just frustrating that it has got to the point that I can't drive it anymore.

I also have a 64' Chevy stepside that I recently inherited. It sat for 10 years and with new gas, ignition and battery I got it running great. It has a stock 350 with a small RV cam in it. I am just enjoying the stock engine its much easier to tune. That's why I want to detune this engine as well. I guess my Hot Rod blood has thinned a little as I have gotten older.

Bret
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  #18 (permalink)  
Old 11-14-2012, 03:37 PM
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Yeah I can see how you are confused. It did sit for the last 8 years except for the month of January in 2010 when I drove it to work due to my Camaro being down. When I stopped driving it that month it started running really bad and I parked it.

I have tried for the last 2 years on and off to find the problem. I started by changing out the original HEI dist(which was worse for wear) with the Procomp and that didn't fix anything. Next I readjusted the valves and that didn't change anything so I thought maybe the gas had gone bad.

I put off dropping the tank for the last year and I finally did it a couple of weeks ago and didn't realize how easy it was. So I started it up again hoping it would run better with new gas but it still has the same problem. Alot of detonation when I try to drive it. So I messed with the timing from 8* to 18* and no luck.

So I thought I would just detune it to more of a stock motor. So thats when I posted on here looking for a more tame or stock cam that would work with my existing parts and changing the pistons to lower compression. (even though I know this engine is a mild combo).

I do have a set of 882 heads I could put on and just change the cam, but I really like the Edelbrocks.

Sorry for the confusion.

Bret
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Old 11-14-2012, 04:41 PM
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I hear what you are saying. I did change the plugs. Did a compression check this past week and all cylinders were between 180-190 psi. I havent changed the oil in a long time because the engine only has about 3,000 miles on it. As far as going above 4500 rpm it won't go that high in gear right now! And I only put about 3 gallons of gas in the tank. The tank looked really good inside I was really surprised for being 33 years old.

I will drain the oil and cut the filter apart as you said and see if there are any signs.

Bret
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Old 11-14-2012, 06:57 PM
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When I put it in gear and hold my foot on the brake and push on the gas, that is when I can hear the valves rattling as I call it, or real bad detonation.

The weird thing is it does not blow any smoke from either tail pipe. The last time when my cam went flat in my last engine it was blowing smoke like a train and idling very rough.

When it is idling it runs fine and you can blip the throttle and it doesn't sound like there is any mechanical issues.
Thats one of the disadvantages to a lopey cam. Sometimes its hard to diagnose if you have a ignition, vacumn leak or what is wrong.

Bret
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Old 11-15-2012, 12:35 AM
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Rod

I don't guess it might have a rod starting to knock?? Just a thought, Is the old pressure steady? Does it drop when the engine warms up?? Just a thought , It sounds like its very loud, And some times you can here it on both sides?? I would drain the oil and cut the fiter open and just look,
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Old 11-18-2012, 10:32 AM
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Bodiebyes it has good oil pressure. 80psi when cold and about 60-65psi when warmed up.

I cut the oil filter open today. I didn't see any large pieces of metal in the filter media. However the oil at the bottom which was about a 1/2" deep had a metallic tint to it. Very small particles. I have never cut a filter open is this normal? The oil I drained out of the filter before cutting it open was fine just a little dirty.

Looking for advice from here. If the small particles are normal, then I am going to put a set of rebuilt 882 heads I have on and change the came to a small RV. Make it basically into a stock engine.

Bret
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Old 11-18-2012, 11:37 AM
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Heads resurfaced

How much did you take off the heads? Did you use a pushrod checker to check what length you need? Too long , wrong angle, Nosiey? Just a thought? Man I have been there chasing Gremlins!!! Taking the performance out of the is not the awsner. It has to be timming related. Take the plugs out. take the valve covers off. Turn the engine over by hand untill you get to top dead center. It will push air out the number one plug. Both the rockers on number one will be loose. Number 6 they should have tension on them. if Number one has tension . you are on Number 6. Rotate 180 degrees. Balanance should be on zero. Rotate it to 20 degrees before. Check where distubter is pointing. Line it to # 1. put evrything back together and crank it. Timming should be set. Thats how I do it. and It should crank and run. You might have to play withthe timming,But it should be close. I like to set the valves on cynder at a time. Just how you got # 1 up turn the engine by hand, keep the plugs out . When the exhaust valve stats to open. Set the intake, Back it off till loose , the tighten till you feel Zero play the turn it a half a turn. Exhaust valve, Rotate the engine untill the intake valve stats to close. Then set the exhaust the same way. I know its time consuming, But it will be right. I only run soild cams so it set the lash like this. An Old timer showed me this way and its the only way I do it. I works evrytime. Check the push rods and Balancer first, You'll get it. Don't go back stock!! It sucks!! If you are worried about compression try a thick headgasket first, I would. As long as you are under 10-10.5:1 you should be ok. Especally if you have alumnium Heads. Just a thought. Good luck!!
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Old 11-18-2012, 12:22 PM
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If you are worried about compression try a thick headgasket first, I would.
Generally speaking, a thicker gasket will make the situation worse due to a wider squish.
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Old 11-18-2012, 12:52 PM
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Head gasket

If the heads had been cut alot. The push rods would be to long?? A thicker head gasket would give him less compression?? Isn't that what he wants??
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Old 11-18-2012, 12:58 PM
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I'm out , You Can't even talk on here with out someone telling you , You are wrong!!! I was just trying to help the guy out!!
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  #27 (permalink)  
Old 11-18-2012, 01:02 PM
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I'm out , You Can't even talk on here with out someone telling you , You are wrong!!! I was just trying to help the guy out!!
That's a flaw in your character dude. If you can't take constructive criticism when you don't know what you're talking about, then you need some professional help with your problem.
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Old 11-18-2012, 01:19 PM
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bj383ss,
I didn't read where you had said anything about the carb. If you have good compression and ignition(blue spark) and it won't turn over 4500rpm I would suspect the fuel system. There are some Holleys that have had problems with "rotting" in the fuel bowels on later models(foreign made metal)and elsewhere on other websites. If you know the fuel presure is good I would check the fuel filter, float levels, and remove the carb float bowels and look for debri clogging the jets(especialy since it sat so long) or a blown power valve.
It would probably be easier to swap a borrowed carb to install on the engine for a quick test.FWIW
ssmonty

Last edited by ssmonty; 11-18-2012 at 01:28 PM.
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  #29 (permalink)  
Old 11-18-2012, 01:28 PM
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tech,you are blunt like I am. What you said was correct and bottom line,we all learn something here.
debates are healthy,arguing is a waste of time,,,,
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Old 11-18-2012, 01:35 PM
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tech,you are blunt like I am. What you said was correct and bottom line,we all learn something here.
debates are healthy,arguing is a waste of time,,,,
Thanks Vinnie, I just call 'em like I see 'em. If I'm wrong on a subject and I'm called on it, I'll eat crow and find out the truth and I expect the same from others.
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