SCAT Rotating Assembly
09-27-2011, 10:17 AM
#27
The only way to know for certain is to use something like a Moroso sbc CC plate, it's thick and drilled for head bolts. CC the piston at TDC, with a used (same as going on the engine) head gasket under the plate. Then CC the heads. Add those together, then do the math. Anything else is pulling numbers out of your butt. Amazes me how many try to build their own engines and don't even own a CC burett. That is not building, that's just bolting one together.
09-27-2011, 11:32 AM
#28
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Not everyone is going for a 9 sec car or has the means to do so, can u buy parts proven as good combos, yes... Build it...bolt it together... Tomato TOMahtoe.. Damn why don't we all own CNC and CC machines so we can all pull wheelies 
anyone Wana loan me a dollar? Lol HEY! I got it!!, I need a million people to loan me a buck then outt those million people we'll have a lottery and draw one name and the same million people plus me will loan that person a buck.. We'll continue untill we're all millionaires and can pull wheelies!!
I think the bum's in the medians are on to something here lol
anyone Wana loan me a dollar? Lol HEY! I got it!!, I need a million people to loan me a buck then outt those million people we'll have a lottery and draw one name and the same million people plus me will loan that person a buck.. We'll continue untill we're all millionaires and can pull wheelies!! I think the bum's in the medians are on to something here lol
09-27-2011, 02:43 PM
#32
09-27-2011, 03:38 PM
#34
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The thing is, its easier to ask a question on a forum than it is to spend $130 on a glorified water dropper and what ever else is needed to get the exact chamber size of my engine at TDC. That's why I asked, I don't have the money or equipment to do that, otherwise I would. I also want to figure out what pistons I need and order them before I bore my block .030" over. That's why I'm asking. I know I'm not taking the complete scientific method to building an engine, or as you say, bolting together an engine. I plain and simply don't have a resources to do that. That's why I don't run 9's, and don't plan to.
09-27-2011, 05:28 PM
#35
You do not seem to understand, your question can not be answered without more info.
For the too lazy or too uninformed to research for yourself:
A cheap 383" combo:
If you use SRP 138089 pistons with 5 CC valve pockets (and do not have to cut the valve pockets further), a Fel Pro 1074 head gasket (.039" thick = safe min total with zero deck), and actually zero deck the block, if your heads hold 56 cc, you should have about 12.27-1 compression.
53cc heads = 12.78-1
52cc chambers (GM's LT1 blueprint spec) = 12.967-1.
4.030" bore and 3.75" strock = 783.847 CC cylinder volume. I would not use thinner gaskets with zero deck clearance on a street engine. If you really know what you are doing you can fudge that total deck number and get the chambers down a little, to get over 13-1. You have to angle deck the pistons on one side to do it.
That glorified water dripper is a vital tool. You have no idea where you actually are without it, or some hand holding.
Hope this helps.
For the too lazy or too uninformed to research for yourself:
A cheap 383" combo:
If you use SRP 138089 pistons with 5 CC valve pockets (and do not have to cut the valve pockets further), a Fel Pro 1074 head gasket (.039" thick = safe min total with zero deck), and actually zero deck the block, if your heads hold 56 cc, you should have about 12.27-1 compression.
53cc heads = 12.78-1
52cc chambers (GM's LT1 blueprint spec) = 12.967-1.
4.030" bore and 3.75" strock = 783.847 CC cylinder volume. I would not use thinner gaskets with zero deck clearance on a street engine. If you really know what you are doing you can fudge that total deck number and get the chambers down a little, to get over 13-1. You have to angle deck the pistons on one side to do it.
That glorified water dripper is a vital tool. You have no idea where you actually are without it, or some hand holding.
Hope this helps.
09-27-2011, 08:44 PM
#37
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You do not seem to understand, your question can not be answered without more info.
For the too lazy or too uninformed to research for yourself:
A cheap 383" combo:
If you use SRP 138089 pistons with 5 CC valve pockets (and do not have to cut the valve pockets further), a Fel Pro 1074 head gasket (.039" thick = safe min total with zero deck), and actually zero deck the block, if your heads hold 56 cc, you should have about 12.27-1 compression.
53cc heads = 12.78-1
52cc chambers (GM's LT1 blueprint spec) = 12.967-1.
4.030" bore and 3.75" strock = 783.847 CC cylinder volume. I would not use thinner gaskets with zero deck clearance on a street engine. If you really know what you are doing you can fudge that total deck number and get the chambers down a little, to get over 13-1. You have to angle deck the pistons on one side to do it.
That glorified water dripper is a vital tool. You have no idea where you actually are without it, or some hand holding.
Hope this helps.
For the too lazy or too uninformed to research for yourself:
A cheap 383" combo:
If you use SRP 138089 pistons with 5 CC valve pockets (and do not have to cut the valve pockets further), a Fel Pro 1074 head gasket (.039" thick = safe min total with zero deck), and actually zero deck the block, if your heads hold 56 cc, you should have about 12.27-1 compression.
53cc heads = 12.78-1
52cc chambers (GM's LT1 blueprint spec) = 12.967-1.
4.030" bore and 3.75" strock = 783.847 CC cylinder volume. I would not use thinner gaskets with zero deck clearance on a street engine. If you really know what you are doing you can fudge that total deck number and get the chambers down a little, to get over 13-1. You have to angle deck the pistons on one side to do it.
That glorified water dripper is a vital tool. You have no idea where you actually are without it, or some hand holding.
Hope this helps.
That's the kind of stuff I'm looking for, it was very useful. So do you guys think I'd be better off pieceing together my own rotating assembly than buying a "kit" made from just one company?
I have a quick question, were the stock pistons made from MAHLE? Was taking a look through the old rotating assembly today, and noticed MAHLE stamped inside the piston.
09-28-2011, 07:40 AM
#39
in reality its a very useful tool for more than just chambers.......i was amazed at the consistancy of the AI CNC chambers when i measured them........also how i know what my CR is down to .01 of a point.....guess that makes me a garage geek haha
09-28-2011, 07:47 AM
#40
That's the kind of stuff I'm looking for, it was very useful. So do you guys think I'd be better off pieceing together my own rotating assembly than buying a "kit" made from just one company?
I have a quick question, were the stock pistons made from MAHLE? Was taking a look through the old rotating assembly today, and noticed MAHLE stamped inside the piston.
I have a quick question, were the stock pistons made from MAHLE? Was taking a look through the old rotating assembly today, and noticed MAHLE stamped inside the piston.
