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Falcon Global 343 Pistons |
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PHAT69AMX 
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Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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 Posted: Jun/27/2018 at 8:06pm |
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Rods are -.003 in posted Chart, so stock 5.875 bump CR a little more... Below is stock 5.875 Rods, Falcon Slugs, your cam spec, FelPro Gasket using .043 compressed 4.265 hole dia. I say your new set-up ought to "thump" pretty good with premium petrol and the "right" timing advance... Gonna get a new Timing Chain ? A Cloyes True Roller? Cloyes #9-3118 is the "good" set, not #9-1118 or #C-3091 or #C3008K Here is the Static and Dynamic Compression Calculator page at United Engine and Machine:(edit) - oops, sorry, in your previous post, I overlooked the key word "interpreting"...  Edited by PHAT69AMX - Jun/27/2018 at 10:44pm |
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WesternRed
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Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5798 |
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Posted: Jun/27/2018 at 8:21pm |
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Yes, been there and done that, they used to have a good technical article to go with it on what to expect from a particular dynamic compression number. Their calculation using intake closing angle @ 0.050" + 15 is different to some other calculators that just use the actual intake closing point.
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1982AMCConcord
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Joined: Jul/13/2012 Location: Kenosha, WI Status: Offline Points: 1287 |
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Posted: Jun/28/2018 at 7:20am |
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Doesn't SCAT make an H Beam Rod that is 5.885?
Would using these pistons with a rod at 5.885 increase the CR as well?
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PHAT69AMX
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Posted: Jun/28/2018 at 10:29am |
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Yes, longer 5.885 Rods would increase CR... but as it is with the Stock 5.875 Rods
the Dynamic CR of 8.83:1, with the Cam he is using and the United Engine Calculator, is marginally / questionably high for Pump gas... But all calcs are stock nominal values, so he's gotta measure all his own real parts... |
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1982AMCConcord
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Posted: Jun/28/2018 at 10:32am |
Thanks!
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WesternRed
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Posted: Jun/29/2018 at 2:35am |
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I've looked at those rods on the web, but never noticed before that they are 0.010" longer than stock, handy to know. Unfortunately they are made for a floating pin arrangement and the Falcon pistons are press fit, not that they are in the budget at the moment.
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1982AMCConcord
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Posted: Aug/14/2018 at 7:32am |
Darren... Would the Wiseco pistons work with the Scat Rods better? I'm curious about what the CR would be with those pistons and the longer Scat rods. I've been torn on what pistons/rods to use in my 360 for a while. I see you are using the stock rods with the Falcon Global pistons... and I am glad to see that they are both compatible. That's a good combination. Press fit pistons/rods can be converted to floating right? I realize that doing stuff like that adds to costs... so it its not feasible for a lot of people.
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WesternRed
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Posted: Aug/14/2018 at 4:42pm |
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I'm far from an expert, but I would think that by the time you paid for the extra work to convert the pistons to floating pins, you would be better off just buying pistons that are made that way in the first place.
Couple of other things worth noting is that there appears to be plenty of clearance to the crank throws with the Falcon Global pistons. It looks like I'm at 0.019" deck clearance even with the taller pistons, so have to assume reconditioned rods are slightly shorter than stock and also allow for manufacturing tolerances on the block, not really a big issue for me as far as compression goes. The only other thing that comes to mind is that the pistons are maybe a little small on the diameter, I measured 4.077" towards the bottom of the skirts at right angles to the pin, with no actual instructions on the proper place to measure. Factory spec on the bore is 4.079"-4.083" and mine are coming out at 4.081"-4.082", so the pistons are a little on the loose side, but again no instructions in the box to tell you what to run with these pistons. I'm ok with a little more clearance for what is going to be a race only motor. Final word is that I know somebody else who bought the same Falcon Global pistons a couple of years ago and they were not Rebuilder's Choice brand.
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oldguy
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Joined: Nov/07/2011 Status: Offline Points: 94 |
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Posted: Aug/14/2018 at 11:21pm |
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I have falcon global pistons in the 360 in my AMX. been very pleased,runs great goes like stink
probably 10k miles since I put the motor together
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PHAT69AMX wrote: