entropy
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posted September 06, 2006 01:28 PM
yep, that'll work!
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psycho1122
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posted September 06, 2006 03:40 PM
So, entropy; what would a quench of .027" with a stock (unmilled) head give you for CR?
This set up is on my 2000 12R with a Muzzy 1270 kit, no base gasket 
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entropy
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posted September 06, 2006 04:00 PM
psycho,
I have no experience with stock stroke motors, but a quench of .027"???
YIKES!! way thinner than I'd run it. Did you get that quench just by taking the base gasket off??? It seems the block would have to be milled???
Are you sure it's .027" (zero deck)???
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osti33
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posted September 06, 2006 04:07 PM
 Edited By: osti33 on 6 Sep 2006 17:08
quote:
So, entropy; what would a quench of .027" with a stock (unmilled) head give you for CR?
This set up is on my 2000 12R with a Muzzy 1270 kit, no base gasket
Damn! .027" is pretty tight for a forged piston. Tighter than I would want to run it, but if it's it working for you who am I to argue? 
I would also like to know if the cylinder block has been decked??
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psycho1122
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posted September 06, 2006 04:07 PM
YEP!! I ran this set up twice now. I shared this little bit of info with Doug Meyer:
When I pulled the head off the first build, all the pistons (JE) had a small polished spot in the quench area where no carbon would build up!!! I called Doug a bit concerned, his reply was a suprise and quite refreshing......."PERFECT!" he claimed. So, I put it back together the same way. It runs sooo NICE! Torque is over 100 by 4,000 rpm and peaks at 112 ft. lbs at 7,400.
Piston to valve is still roomy at .060.
You think I'm over 14:1??
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psycho1122
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posted September 06, 2006 04:09 PM
No detonation issues either!! Gasses don't hang out in the quench area
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osti33
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posted September 06, 2006 04:09 PM
Edited By: osti33 on 6 Sep 2006 17:11
Did you deck the block?
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psycho1122
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posted September 06, 2006 04:11 PM
Edited By: psycho1122 on 6 Sep 2006 17:16
No, Block is stock (1270 bore only). Pistons are right at deck w/o base gasket.
Don't mean to HighJack here gentlemen!! I'm "kinda" on topic....
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Wideout
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posted September 06, 2006 06:04 PM
I say fire away. This is good info.
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Johnnycheese
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posted September 06, 2006 06:14 PM
on a 1270 you can easily go that tight and even spary
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entropy
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posted September 06, 2006 08:45 PM
quote:
on a 1270 you can easily go that tight and even spary
JC: why can you get so close on a 1270 and not on a 1375???
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Johnnycheese
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posted September 07, 2006 02:13 AM
stroke
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entropy
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posted September 07, 2006 02:22 AM
why "stroke"? what difference does 4.6mm make???
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TRNorBRN6001
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posted September 07, 2006 05:26 AM
Were you guys realy up at 3:20 AM????..........and I thought I was crazy for staying up till 1am doing paper work!
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psycho1122
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posted September 07, 2006 05:27 AM
I would bet on overall elongation of rod / wristpin / piston due to increased piston speed.
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osti33
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posted September 07, 2006 01:10 PM
quote:
Were you guys realy up at 3:20 AM????..........and I thought I was crazy for staying up till 1am doing paper work!
No doubt in my mind. Karl keeps some crazy hours...
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osti33
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posted September 07, 2006 01:11 PM
quote:
why "stroke"? what difference does 4.6mm make???
Yeah. What he said. 
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buddy
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posted September 07, 2006 02:08 PM
It's like I said. Carl's hard to keep up with because I think he only sleeps on the third day or so.
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Johnnycheese
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posted September 07, 2006 03:32 PM
quote:
I would bet on overall elongation of rod / wristpin / piston due to increased piston speed.
close but the rod is the same length
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osti33
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posted September 07, 2006 03:53 PM
quote:
quote:
I would bet on overall elongation of rod / wristpin / piston due to increased piston speed.
close but the rod is the same length
The suspense is killing me here John.
Why can you go tighter with no extra stroke??
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psycho1122
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posted September 07, 2006 06:22 PM
Edited By: psycho1122 on 7 Sep 2006 19:36
Ok, so rod length is the same.....granted.
Has it something to do with piston motion at TDC?
The longer stroke creates more turbulence and faster combustion BTDC and ATDC at the top of the stroke. This has to do with the increase of "Rod Angle". Rod angle increase will significantly speed up the piston just before TDC vs. a shorter stroke engine with the same rod length.
So, is "Rod Angle" part of the correct answer?
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Johnnycheese
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posted September 08, 2006 03:12 AM
Damm this is why I like this site.
someone will always know
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aliveagain
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posted September 08, 2006 07:44 AM
splain
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psycho1122
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posted September 08, 2006 09:12 AM
The longer stroke crank w/ the same length rod has increased leverage on the rod big end.
The rod big end is X amount further from the crank center vs.stock stroke, this leverage typically peaks at 80 deg. ATDC. (when crank arm and rod are at a right angle)
The angle of the Rod from big to small end is greater during this portion of crank rotation vs. a shorter stroke engine.
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TRNorBRN6001
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posted September 08, 2006 09:16 AM
4:12AM !!!!!!!!!!!!!!!!! Are you going to bed or getting up? What time do you do lunch on Sat? If your not doing much I can drop by with some Popeye's.
With the increased piston speed and increased angular moment at TDC does it cause the piston to rock, or is it because there is a greater lash in the rod bearing and piston pin floating areas, or a cobination of all the above? Or am I still not getting it?
Very Cool Topic, There should be a technical section for all this cool stuff! Or build section with all this neat stuff.
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