Post away 
CT spring GTG May 7th 2016
- Thread starter Paragon Builder
- Start date
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ri chevy
ArboristSite Guru
Spoken with true confidence!
I will say ahead of time that the piston is a one of experiment. I tried something different with trying to "cylinder match" the sides of the piston. This piston actually was in my 346 and I simply re-purposed it. A new piston will be going back in my 346. While it looks kind of cool, I don't see it really making any difference. I don't anticipate doing it again.
Mattyo, should I post stuff like this in this GTG thread, or rather your dedicated 350 thread?
Mattyo, should I post stuff like this in this GTG thread, or rather your dedicated 350 thread?
This thread is fine. I'll work on posting some stuff in the 350 thread as well.
I'll compile the vids and post...probably tomorrow or Tuesday
I also want to do a summary vid explaining the 350 challenge that I undertook.
All in good time
I'll compile the vids and post...probably tomorrow or Tuesday
I also want to do a summary vid explaining the 350 challenge that I undertook.
All in good time
Brad did you happen to do a compression test on this I got a hundred and seventy-five pounds
I'm not positive, but I thought it was 185. I can check it again on my SnapOn gauge if you'd like for comparison.
It definitely didn't get that high....I pulled for a while. When you get it back together check it.
drf255
BAD CAD
Brad, your little 340/350 was pretty amazing.
Would I be correct in saying that you made a very large angled squish?
Would I be correct in saying that you made a very large angled squish?
You'll see soon.
I didn't alter the squishband. I used a pop-up piston.
drf255
BAD CAD
But you matched the entire chamber with the piston. So in essence, you created squish throughout the chamber.
The piston was cut flat, so the squishband is the same as stock.
Brad's saw...the popup
I gotta say... its pretty
My measurements were:
Squish - .014". It was machined based on my 346 where it wasn't that tight.
Exhaust -106°
Transfers - 120°/122° staggered with the mains opening first.
Intake - 81°
You may notice that the main transfers are about .100" wider than stock. I only cleaned up the width on the secondaries. When case matching the cylinder base, I didn't just taper it into the duct, but took it all the way up to match with the widened main transfer port. This was an experiment, something that I've not tried on this model. I will be testing this with my 346, comparing it to another cylinder where the secondaries are widened like I normally do.
The cylinder wall was raised about .100" along the transfer ducts.
Both the intake and exhaust are 70% in width along the chord as compared to the bore. The intake is squared up on both the floor and roof, and the roof raised just a bit. The bulge in the one side of the intake was removed.
All of these details make a difference. It all adds up. Like I told Mattyo, it's more in the porting than the 357 intake system. I originally had the 346 intake and carb on it when I made the video. I considered leaving it on there just to make the point that it's mostly in the porting. I wad talked into switching it out when I pulled it back apart to add the impulse passage.
my uk kit saw for comparison
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