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[110tHunDer]

Those aren't rankings Chip.  No competition between brothers.  The member numbers are based solely on astrology as predicted by the computer in my old Thundemax (since I couldn't find any other good use for it!).

Now that is some funny chit right there!

[djkak]

.....If they sent them with the wrong skirt length, that tells me they sent you pistons designed to be used with a stock TC88 crank, not a stroker crank....My advice, for what it's worth, is after all this time and effort, take a little more time and have them do it right.

Jerry

With standard length cylinders the wrist pin would be located approximately 3/16” higher than in the same piston designed for a 4.0” stroke. The top of the piston will make hard contact with the head if a 4" stroke piston is installed on a 4 3/8" crank with standard length cylinders. 

Regarding the balance issue; in this application the reciprocating pistons don’t counterbalance one another, but move on a common crankpin 45 degrees apart. Matching the reciprocating weights of the pistons and connecting rods is not critical. Maintaining the same total reciprocating weight will maintain the original flywheel balance factor.

Large bore long stroke H-D’s (120’s & 131’s, Sidewinder EVO’s, etc.) often use rear pistons with a very large window cut into the front facing skirt. This provides clearance for the thrust surface of the front piston when the piston skirts pass by each other at the bottom of the stroke....other than that Hoist is totally screwed!!

djkak

[Twolanerider]

Regarding the balance issue; in this application the reciprocating pistons don’t counterbalance one another, but move on a common crankpin 45 degrees apart. Matching the reciprocating weights of the pistons and connecting rods is not critical. Maintaining the same total reciprocating weight will maintain the original flywheel balance factor.

DJ, thanks.  I have no idea how many times I've sat and looked at the rotating assembly of a Harley V-Twin and never thought about what I was looking at.  Too used to automotive familiarity and never thought beyond it.  One paragraph and a mental image and it's obvious they don't counter one another.  Real glad there was at least one smart guy in this thread tonight .

[grc]

dj,

Good catch on the wristpin location, I forgot about that.

True, with a common crankpin and 45 degree angle, exact matching of piston weights isn't absolutely critical (but it is still a reasonable goal).  However, turning someone loose on a piston with a grinder, with no scale and no specified dimensions, is a jack-leg idea at best.  And after all this unscientific grinding, how do they know if they maintained the total reciprocating weight within at least the original factory tolerance for a stock crank?  One other question, isn't it normal to check piston to piston clearance and piston to head/valve clearance during the initial assembly, at least when using nonstandard parts, rather than bolt the thing together and have it lock up?  

You know, this story reminds me of one of the reasons I stopped watching the Orange County folks butcher their builds on TV.  Bushing won't fit?  Grind the sucker down or drill out the hole with a hand drill.  Shaft won't slide into place?  Beat the SOB with a 5 pound hammer.  Slight misalignment?  Heat 'er up with a torch and beat it with that same 5 pound hammer.  Maybe some folks don't mind paying big bucks for crap like that, but you won't find me doing it.  My advice remains the same:  take the time to do it right.

Jerry

[Hoist!]

dj thanks for that. Glad to see one guy who knows this is a common crank pin 45 deg v-twin motor, not a counterbalanced car engine! And I'm glad ya'll asked how much clearancing we're talking about here, befpre you shot your mouths off. But who needs the facts? Since the most experienced builder in the lot here, Chip, statred this whole thing, I'll let him lead ya'll down the road of BREAK HOIST's BALLS! I'd give you all chit back, but since you're all armchair engine experts here, I might as well let you have your fun. Especially since


Ya'll have no F'ing idea what you're talking about!!!

Hoist!

[miker]

You don't need to when you got an asspile of money, that makes you smarter than us slobs who actually spin thier own...   Hand in ther pal....

Miker

[Hoist!]

dj,

Good catch on the wristpin location, I forgot about that.

True, with a common crankpin and 45 degree angle, exact matching of piston weights isn't absolutely critical (but it is still a reasonable goal).  However, turning someone loose on a piston with a grinder, with no scale and no specified dimensions, is a jack-leg idea at best.  And after all this unscientific grinding, how do they know if they maintained the total reciprocating weight within at least the original factory tolerance for a stock crank?  One other question, isn't it normal to check piston to piston clearance and piston to head/valve clearance during the initial assembly, at least when using nonstandard parts, rather than bolt the thing together and have it lock up?  

You know, this story reminds me of one of the reasons I stopped watching the Orange County folks butcher their builds on TV.  Bushing won't fit?  Grind the sucker down or drill out the hole with a hand drill.  Shaft won't slide into place?  Beat the SOB with a 5 pound hammer.  Slight misalignment?  Heat 'er up with a torch and beat it with that same 5 pound hammer.  Maybe some folks don't mind paying big bucks for crap like that, but you won't find me doing it.  My advice remains the same:  take the time to do it right.

Jerry

When you're told that you're getting properly designed parts and to just assemble them like stock, they should bolt up properly. Alex thought this was all properly setup. He wasn't told he was doing a custom build. He found out because the vendor, CP, couldn't get these pistons right. Alex checked rotation after installing the barrels and heads. That's how he found this. The motor wasn't together nor tried to run. It was being checked thru the build process. Now the pistons are clearanced, waiting for new gaskets this morning, and will continue thru the assembly process.

Sorry if you relate this to a butcher job as you describe. I, Wes, nor Alex see it that way. We know how much was clearanced. No one else asked. It's not important now. Chip wouldn't be able to post in every thread about piston balancing, if he knew he was clueless about this!

Hoist!

[Chief]

Ya'll have no F'ing idea what you're talking about!!!

Hoist!

I'm sorry dude, buy you live too far north to be allowed to use "Y'all". Better off if you stick with "Youze guys".

[SBB]

It's not important now. Chip wouldn't be able to post in every thread about piston balancing, if he knew he was clueless about this!
Hoist!

Damn

I'm not feeling the love here!
But as Howie said "It's not important now".
So I guess to him it isn't.
In the 120 and the 95 it was important to me.
But I build to last, maybe that's the difference.


And Howie,

your quote,

if he knew he was clueless about this!

Hello, hello what does that mean?
If I knew, then I wouldn't be clueless.
What happens to you Howie?
Do you type this stuff because your finger go crazy and you can't control them or
is it another case of "let me throw this chit up against the wall and see if it sticks?"
Maybe somebody will believe it!

Good luck in your build and hope it last.

S
  /
    B

[Hoist!]

Damn

I'm not feeling the love here!
But as Howie said "It's not important now".
So I guess to him it isn't.
In the 120 and the 95 it was important to me.
But I build to last, maybe that's the difference.


And Howie,

your quote,

Hello, hello what does that mean?
If I knew, then I wouldn't be clueless.
What happens to you Howie?
Do you type this stuff because your finger go crazy and you can't control them or
is it another case of "let me throw this chit up against the wall and see if it sticks?"
Maybe somebody will believe it!

Good luck in your build and hope it last.

S
  /
    B

You're not feeling the love? How can that be? I'm giving you all the love back that you show to me!

And I really dig your technical descriptions of what's going on here. Keep that tech stuff coming. It's so much more useful than djkak's engineering explanations on the issue. I modify my build with each one of your informative responses!

Hoist!

[Twolanerider]

Well, did UPS make it on time one more time?

[Hoist!]

Well, did UPS make it on time one more time?

Gaskets weren't in as of 1/2 hour ago. But either was Alex. I'm waitnig on the call now.

Hoist!

[Twolanerider]

Gaskets weren't in as of 1/2 hour ago. But either was Alex. I'm waitnig on the call now.

Hoist!

Nothing like pushing things to the wire from everyone.  Tracking for the package even showing it in town?

[Talon]

Nothing like pushing things to the wire from everyone.  Tracking for the package even showing it in town?

Don't always trust those tracking reports. I had one that said my package was in town, didn't show up on time, even though I paid for two day. I called UPS, they said that they hadn't had a physical scan in 12 hours and in that case they said that they assume it has gone on to the destination city. So they updated the tracking site with their assumption!

[Twolanerider]

Don't always trust those tracking reports. I had one that said my package was in town, didn't show up on time, even though I paid for two day. I called UPS, they said that they hadn't had a physical scan in 12 hours and in that case they said that they assume it has gone on to the destination city. So they updated the tracking site with their assumption!

Amen.  Couple months back I had one that tracking said I'd received and signed for personally.  Except I was 1100 miles away.  Driver thought it would be ok to sign my name for me.


(bet we're really making Howie feel good about now)