Stop in for a cup of coffee

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I want to cc the piston/depth on this chebbie engine I got. No published info on the pistons as far as volume goes so I'll check it in the bore. Pretty cool way to do that in your article. Never would have thought.
 
krazykuda said:
If you need any help doing the calculations, let me know...

Just find the head volume of the combustion chamber (with a correct spark plug installed), the head gasket thickness and diameter of cylinder, and the bore and stroke of the engine, and how far the piston is from the top of the block at TDC...
Click to expand...
I played with wallace racing calculator and it would seem I could enter the cc's in as piston volume and come up with the correct #'s????????
 
GeorgeH said:
I want to cc the piston/depth on this chebbie engine I got. No published info on the pistons as far as volume goes so I'll check it in the bore. Pretty cool way to do that in your article. Never would have thought.
Click to expand...

yeah, since it's difficult to calculate the clearance volume, it's best to fill it with liquid to measure it....

When you have nice clean geometry, then you can use formulas to calculate the volume, but when it's more complicated geometry, you break it up into pieces that you can measure and add or subtract to find your info...
 
GeorgeH said:
I played with wallace racing calculator and it would seem I could enter the cc's in as piston volume and come up with the correct #'s????????
Click to expand...

The thing I don't like about those on line calculators, is you don't know what assumptions they are using for some values... I like to go through the math myself so I can see how each bit contributes to the final number and so I can make sure that it's accurate. ...
 
krazykuda said:
The thing I don't like about those on line calculators, is you don't know what assumptions they are using for some values... I like to go through the math myself so I can see how each bit contributes to the final number and so I can make sure that it's accurate. ...
Click to expand...
Makes sense, when I get some numbers maybe hit you up and see what you think. it's a 5.7 chebbie and I'm wanting to put 305 vortec 58cc heads for my boat. If the numbers hit 9.5 or so probably find other heads.
 
krazykuda said:
Yep, I ordered a few because of the shipping... :popcorn:

It helps to have a spare or two when you misplace one.... :BangHead:

Now try to find a small funnel, the one that I got from Bed Bath and Beyond, they don't carry any more....
Click to expand...
I ordered a 6 pack of the little funnels because I'm sure they'll be the first things to disappear. lol
 

GeorgeH said:
order 1 cylinder and one funnel was like 4.90 and 7.75 shipping lol
Click to expand...
Now you just go to the hardware store and get a few pieces of 1/4" thick plexi glass... One for each engine that you will be checking, and one or two in case you mess one up...

when you drill the mounting holes in the plexiglass, the larger drill bits tend to grab the piece and/or make large chips, so you have to clamp it down and go carefully with the drill. Gentle pressure and test which speed it likes best.... Be patient... I've cracked corners off when the drill bit acts up....
 
krazykuda said:
Now you just go to the hardware store and get a few pieces of 1/4" thick plexi glass... One for each engine that you will be checking, and one or two in case you mess one up...

when you drill the mounting holes in the plexiglass, the larger drill bits tend to grab the piece and/or make large chips, so you have to clamp it down and go carefully with the drill. Gentle pressure and test which speed it likes best.... Be patient... I've cracked corners off when the drill bit acts up....
Click to expand...

I'm thinking a unibit
 
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