Tazzielittle
Former member ·
As in Piston and barrell kits, Heads, Cranks, Cams.
Between the two.
And wes's waterpipe still runs cooler!
Tazzielittle
Former member ·
Bizarre Moderator The artist formerly known as blue74l
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jakriz Wolfsburg Wizard
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Bizarre Moderator The artist formerly known as blue74l
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Peter Leonard Moderator Volatile
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Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion
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jakriz Wolfsburg Wizard
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Baja Wes V6 Baja Pioneer
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It's always funny when people with no idea post stuff.Peter Leonard wrote:does anyone know what the thermal co-efficient of linear expansion is for chrome molybdenum rods:P
i'm guessing they're quite resistant to creep... damn shame the rods are sized to expand to the right damn length WHEN THEY'RE STOCK!
vw54 Administrator Always Waiting 4 Friday
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Baja Wes V6 Baja Pioneer
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amazer kombi pilot
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geez Wes. Keep those people out of here and there'd be nuffin to read. Have you tried printing this shit out? I did ages ago and I think it was about 50 pagesIt's always funny when people with no idea post stuff.
vanderaj Administrator a suffusion of yellow
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Peter Leonard Moderator Volatile
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jakriz wrote:Don't u worry about us Petey babe
No problem wizzo😉
*waits to hear the sound of a six piece CONROD circulating thru your sump*😎
jakriz Wolfsburg Wizard
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Peter Leonard Moderator Volatile
1,456 posts · joined Apr 2003 ·
🙂Baja Wes wrote:"It's always funny when people with no idea post stuff."Peter Leonard wrote:does anyone know what the thermal co-efficient of linear expansion is for chrome molybdenum rods:P
i'm guessing they're quite resistant to creep... damn shame the rods are sized to expand to the right damn length WHEN THEY'RE STOCK!
fully 🙂
"First I will start with the creep comment. Do you know what creep is? I didn't think so."
WAIT wait wait, i do, i just misused the term, not expecting to have to wade into a ridiculous definition war. i should have just said "resistant to dimensional variation relative to temperature change"
oo and for the record, most types of chrome moly are highly resistant to 'creep'. hence their various industrial applications.
"Creep is virtually non existant until you get up to around 50% of the recrystallisation temperature of the steel. I can guarantee your conrods aren't getting that hot. How hot did you think your conrods got anyway?"
About 100 degrees or so i guess, whenever I stickytaped a sender on them it got flung off into the sump... oo yeah and i agree it's kinda insignificant on the CONRODS.
"Creep is important in high temperature high stress components like turbine blades."
just for the sake of definition (as you didn't bother to actually tell people what 'creep' IS) creep is when components like aircraft turbines (ta wes) and highly stressed structures like boilers take so much heat and pressure and stretching that they deform and remain deformed even after pressure and heat is removed. does that explain it Wes? 😉
"And chrome moly isn't a specific metal."
no kidding. it's a whole series of alloys. so tell us what the difference between say 4130 and E4340 is... and then let me know what they're using for those racing conrods. That would be more useful than making us digest crud like below :P
"Higher grades are stainless steels, which have an expansion of about 0.000016."
approx 0.000017 actually. and that's the unit change in dimensions per degree temperature rise. so for every degree one unit length of steel goes up in temp, it's size increases by 0.000017 of that unit. just to nail down what the numbers stand for.
"Normal steels are around 0.000012. So the difference between the two is 0.000004. Say you conrods are 100 degrees hotter than your cylinders,"
what's a co-efficient again? something to do with sameness or something...
at the SAME test temperature, different metals are found to have expanded more or less than other ones. hence the problem with allying (not alloying)dissimilar metals with each other under the SAME temperature range when you're working to close tolerances.
"(not that your ever going to see that)"
bloody hope not :o
"than your cylinders, and they are 100mm long. That gives you 0.000004x100x100 = 0.04mm difference in growth between having steel and stainless steel conrods. If you are building your engine to that sort of valve to piston clearance, your crazy."
i'm crazy, yes, but that has NOTHING to do with this discussion 🙂
"Besides, race engines use aluminium rods which have an expansion of about 0.000023, about double that of steel [/i]
lugnuts Custom Title Time!
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amazer kombi pilot
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amazer kombi pilot
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But for a little more you can drive a Volkswagen and kick a porsche arse!amazer wrote:You cant drive a porsche with volkswagen dollars.
amazer kombi pilot
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amazer kombi pilot
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jakriz Wolfsburg Wizard
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70AutoStik Insano Dub Head
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Doug Sweetman Nil Bastardo Carborundum
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Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion
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amazer kombi pilot
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jakriz Wolfsburg Wizard
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Peter Leonard Moderator Volatile
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70AutoStik Insano Dub Head
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amazer kombi pilot
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And when Craig gets his thing revving to half that I want to be there in the front row. I like looking at mechanical carnage.Peter Leonard wrote:someone better go tell the formula one people they've got it all wrong. 20,000 rpm.. hell yeah 😀 how awesome would that sound coming out the back of a beetle 😎
craig's got a good point, horsepower per cc has to be the simplest test of an engine.
amazer kombi pilot
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