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Custom Dodge Ram Performance Mods - Engine - 5.9 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!


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  #1  
Old 09-25-2009, 11:50 PM
34blazer 34blazer is offline
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Default Any weak points on these engines?

the reason i ask is i just finished checking the piston diameters for 2 different 360's. first set of pistons were out of my buddy's dak r/t with less than 30K miles. pistons 1 thru 6 mic'ed out ok but #7 and #8 pistons were out of spec. the #7 piston was 3.989" which is questionable but the #8 piston was 3.932"! i checked it at least a dozen times with the same result. then i checked the other set of piston's from my engine which had 130K miles on the ticker with a bad piston. same story there except with a little more wear on them. the bad piston was 3.902". now thats smaller than a 318 piston, and i could rock it back and forth in the bore so i decided to do a little investigating on the block itself. i looked around the #8 cylinder and noticed that the oil filter housing/bulkhead(or whatever you call it) is intruding on the coolant passage around cylinder #8. now ive known a very similar problem to happen on all or most of the GM engines, more common on the 60* V6's that were on the FWD platforms. theres even a website dedicated to the piston slap those engines produce. basically what id like to do is punch out the block and drop in some speedpro pistons with the dry film coating to help with this problem, i know its only a bandaid. id also like to install piston squirters on the #7 and 8 cylinders as well. maybe even a slight modification to the coolant system to help force more flow around the back 2 cylinders. anyone have some input?

*edit* heres that website i was talking about.

http://pistonslap.com/
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  #2  
Old 09-26-2009, 06:38 AM
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Interesting , never heard of that before . Best bet would be contact a reputable engine builder (Ray Barton) and see what he has to say .
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Old 09-26-2009, 08:07 PM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
Interesting , never heard of that before . Best bet would be contact a reputable engine builder (Ray Barton) and see what he has to say .
i took the block down to the machine shop today and they never heard of that problem. the owner suggested that the back 2 cylinders may be running a little too lean as well. either way im going to drill and install fittings in the water jackets by the rear 2 cylinders. then run some -6 hose from the pressure side of the water pump. this way is forces flow from the back of the block up into the heads to help alleviate some of the hot spots that may develop. not sure about the piston squirters yet, have to do some digging and find out the cracking pressure on them. wouldnt want to go thru all the trouble of drilling into the main oil galley if the oil pressure doesnt get up high enough to open the squirter valve.
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Old 09-26-2009, 09:12 PM
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If i'm correct the connecting rods have a squirt hole already .
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Old 09-27-2009, 11:27 AM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
If i'm correct the connecting rods have a squirt hole already .
generally the piston rods are a solid piece, i havent seen any type of drilled passage in one of these rods. guess its time to go check lol
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Old 09-27-2009, 06:35 PM
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I know the small blocks I've have had them .
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Old 09-27-2009, 09:56 PM
34blazer 34blazer is offline
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
I know the small blocks I've have had them .
ok i checked out the rods, and yes they have a squirt passage already machined into them. i guess it will have to work, the only downside is they spray the relief side of the bore and not the thrust side.
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Old 09-27-2009, 10:35 PM
34blazer 34blazer is offline
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also, im picking out some pistons and need a second opinion on these. i think i have my calculations right for ~ 9:1 comp ratio and compression height. let me know what you think

http://www.summitracing.com/parts/STL-H405CP30/


p/n STL-H405CP30
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  #9  
Old 09-27-2009, 10:36 PM
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Quote:
Originally Posted by Toms Blue Ram 1500 View Post
I know the small blocks I've have had them .
Boy need to start proof reading before I submit . What I meant to say is that I've built quite a few small blocks and all the rods I've seen have squirters in them .
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Old 09-27-2009, 10:53 PM
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oh BTW heres a pic of the piston squirters im talking about just to give an idea.
Attached Images
File Type: jpg oilsquirter3500.jpg (54.5 KB, 18 views)
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