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| Northstar rebuild: Will style (Page 36/119) |
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AJxtcman
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SEP 02, 02:33 PM
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What size pin are you using?
You are using the the Eagle rods?
93-99
DIMENSION
Comp. Ht. Inch. 1.256
C. Ratio 10.3:1
Pin. Dia. Inch 0.8658
SIZES
STD, .25, .50
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'00-03
Flat top.
1.250" CH.
Anodized head.
.8266 pin dia.
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late 03 FWD to current... 04 RWD to current
Piston Pin Diameter 0.9053-0.9055 in
4.4L S/C
Piston Pin Diameter 0.9448-0.9449 in
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Will
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SEP 03, 01:30 AM
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I'm using the standard piston pin diameter but with CP supplied pins which are shorter and lighter than the GM pins. [This message has been edited by Will (edited 09-03-2007).]
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AJxtcman
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SEP 03, 12:31 PM
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GM uses 3 pin sizes in FWD 4.6L
I am wondering what rods you are using?
I like the GM rods and have a lot of sets, but I may build a 00 engine. I have soooooo much more I can do with the PCM.
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jstricker
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SEP 03, 01:31 PM
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As near as I can tell, GM doesn't sell the pins separately, do they? My manuals show them as NS, only available in a piston assembly. If you have a good p/n for the first generation pins I'd be interested.
John Stricker
| quote | Originally posted by AJxtcman:
GM uses 3 pin sizes in FWD 4.6L
I am wondering what rods you are using?
I like the GM rods and have a lot of sets, but I may build a 00 engine. I have soooooo much more I can do with the PCM. |
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Will
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SEP 03, 10:11 PM
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I'm not using any '00 or later hardware. Eagle rods are for '99 and older pins. [This message has been edited by Will (edited 09-03-2007).]
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AJxtcman
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SEP 04, 02:26 PM
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| quote | Originally posted by Will:
I'm not using any '00 or later hardware. Eagle rods are for '99 and older pins.
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Thanks
The only rods avalible are 99?
I have not looked for them.
I have only one set of the 99 and prior.
Now what size pin is the best? smaller or bigger?
Smaller is or can be lighter, but the surface area is less.
The larger has more surface area, but is heavier.
The S/C motor uses a large pin.
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Will
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SEP 04, 05:21 PM
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The Eagle rods were made for the '99 and older engines... before the Y2K engines even came out. Since they all have the same bearing bore diameter and length, only the pin is different.
Dunno the design considerations behind going to a smaller pin on Y2K engines, but they did go to a bigger pin for the SC engines as you observe.
I wanted Hank the Crank ceramic piston pins, but they went out of business or something.
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ryan.hess
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SEP 04, 07:34 PM
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probably related to in cylinder pressures/torque.
If you're going high revving low torque, you can get away with a smaller wrist pin. High torque (esp supercharged!) requires larger pin to reach 100k mile reliability.
I think the 2000+ engines might have been originally designed with a higher rev limiter than the <99's
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AJxtcman
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SEP 04, 08:01 PM
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DIMENSIONS
93-99 Pin. dia. Inch 0.8658
00-03 pin. dia. Inch 0.8266
03-08 pin. dia. Inch 0.9053-0.9055 This is from the late 03 engine update
4.4L Pin Diameter 0.9448-0.9449
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4.6L info
Connecting Rod Length Center to Center 5.9449 in
Connecting Rod Bore Diameter - Bearing End 2.2495-2.2501 in
Width 0.8572 in
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I am just throwing this out. I am not sure what is the best way to go. Big pin dia with light weight aftermarket pin? The rods all look the same just the small end is different. Maybe the next engine I build for my self. hmmmmm.
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AJxtcman
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SEP 05, 01:57 PM
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Does the wrist pin size affect dwell time? I can't remember. long rod vs short rod. big pin vs little pin. Hmmm I am way to old to think any more.
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