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  #16 (permalink)  
Old 07-21-2008, 03:21 PM
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Hmmm...I wonder what I was thinking? Let me do some digging. Here is the rods I was using (I agree they are nothing special) but per class rules we have used them on several race motors.

http://www.competitionproducts.com/p...number=804335P

Let me go grab the balance card off the latest one and see what it says.

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  #17 (permalink)  
Old 07-21-2008, 03:29 PM
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Carl is right, it's been known for years that there is nothing special about the "Pink" rod, it's beyond me why people still hunt for them. I got a good laugh at an Ebay seller who regularly list sets of NOS OEM pinks at $599!!!!! Made me wonder how many fools had bought them

DoubleV23, 417 grams sounds like just the big end weight.

Tom beat me to it, I was still typing.

Last edited by ericnova72; 07-21-2008 at 03:33 PM. Reason: more info
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Old 07-21-2008, 03:30 PM
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Quote:
Originally Posted by machine shop tom
417 grams is the weight of the big end of the rod. The small end is around 175-180 grams.

A good regular type of Sealed Power or Hastings ring will work as well as a gapless type and cost less.

A normal hydraulic lifter will be fine if set up at about 1/8 turn down from zero lash and will cost less.

tom

Thanks for the correction I get the numbers stuck in my head some times.

In the classes that are limited on compression we have seen that the gapless rings work better and reduce leakdown to less than 2%.

Howards sells an anti pump up lifter for 80 bucks per set that we tested on the dyno and found that the max HP was moved up in the RPM and stayed up there longer. These are super sensitive though and any gains were lost if the lifters were set to anything more than .004 preload. (which was about an eigth of a turn)
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Old 07-21-2008, 04:10 PM
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Quote:
Originally Posted by Double_v23
In the classes that are limited on compression we have seen that the gapless rings work better and reduce leakdown to less than 2%.
Static-state leakdown and running leakage are 2 different things. Static-state testing doesn't load the rings as seen in running conditions. That's why most race teams still run standard-gap style rings. There is no real advantage to gapless rings.

tom
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Old 07-21-2008, 08:42 PM
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Quote:
Originally Posted by machine shop tom
Static-state leakdown and running leakage are 2 different things. Static-state testing doesn't load the rings as seen in running conditions. That's why most race teams still run standard-gap style rings. There is no real advantage to gapless rings.

tom
Gapless rings work great as far as a leak down but running is a different story, I get a kick out of the guy that buys gapless ring package but does not have the block plate honed and has to run rags on breathers, we run gaped ring packages with low tension oil rings and after a season of running normal leak downs are 1.5 to 2% and never no rags.

We have used the GM lifter for years with zero problems and in the old GM manual it was mentioned that adjusting to an 1/8 tums the lifter into an ati pump up lifter and the GM lifter have the hardest bottoms compared to any other hyd. lifter out there.
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Old 07-21-2008, 08:47 PM
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Here is a pic of cylinders after 2 seasons good oil, filters and machine work.

The camara makes the honing more pronounced but its a 280 finish with a 600 polish for a plateau finish.
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