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Author Topic: All quiet on the home front ???  (Read 15974 times)

Online teazer

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Re: All quiet on the home front ???
« Reply #110 on: Sep 24, 2018, 19:54:51 »
Good news is that they lasted way longer than expected.  Out with the old and in with the new.

Offline Titan performance

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Re: All quiet on the home front ???
« Reply #111 on: Sep 26, 2018, 17:13:53 »
Fitting a new crank and top end will keep me off the streets.....quite literally !

Offline CrabsAndCylinders

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Re: All quiet on the home front ???
« Reply #112 on: Sep 26, 2018, 17:27:52 »
Does anyone know the purpose of the ribs on the pistons, I never found that ribs made much difference but then I thought they went on the inside.  Seriously, were they to hold oil onto the piston or what. 

Would it have been possible to rebuild the crank but cheaper to buy another?

Speaking of cranks, what do you guys think of the scalloped ones, I don't understand why this would not screw up crankcase compression but then I am the guy who put the ribs on the inside, (I wonder where Rosie is today, hmmm).

Brian
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ZX-14, 900F x 2, 1100F, R100, CBR600, SR500, GT500, RZ350, KZ1000 x 2, Moto Guzzi Lemans lll, CBX550, RD 350, 750 SOHC police special, RG250, TL1000R, GT750, KTM Super Duke 1290 R, Harris/Z-1, Norton 750 Commando, Green 77 KZ650

Offline irk miller

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Re: All quiet on the home front ???
« Reply #113 on: Sep 26, 2018, 18:56:34 »
Does anyone know the purpose of the ribs on the pistons, I never found that ribs made much difference but then I thought they went on the inside.  Seriously, were they to hold oil onto the piston or what. 

Contact reduction.  Less surface area for friction.  They're more often run, especially on cammed motors, above the rings. 

Online teazer

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Re: All quiet on the home front ???
« Reply #114 on: Sep 26, 2018, 19:05:44 »
On that old two stroke design I would suggest that they are there to retain oil rather than reducing friction.  At the time a 250cc single was fairly big for a 2 stroke and a 500 twin was really adventurous for the time. 

Wiseco et all machine small grooves above the top ring to reduce the flow of combusting gas down to the top ring.  They disrupt flow towards the ring.

Offline irk miller

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Re: All quiet on the home front ???
« Reply #115 on: Sep 26, 2018, 19:30:03 »
On that old two stroke design I would suggest that they are there to retain oil rather than reducing friction.  At the time a 250cc single was fairly big for a 2 stroke and a 500 twin was really adventurous for the time. 

Wiseco et all machine small grooves above the top ring to reduce the flow of combusting gas down to the top ring.  They disrupt flow towards the ring.
Funny, I thought oil was there to reduce friction.  Look up JE pistons.  They have diagrams on their site that say exactly why the rings are there. 


Offline unclerob

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Re: All quiet on the home front ???
« Reply #117 on: Nov 05, 2018, 15:42:58 »
Yet another Honda built....one day I'll do something different!

Offline CrabsAndCylinders

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Re: All quiet on the home front ???
« Reply #118 on: Nov 05, 2018, 17:11:49 »
Beautiful work, Uncle!
Lighter, Quicker, Faster.
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Offline beachcomber

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Re: All quiet on the home front ???
« Reply #119 on: Nov 05, 2018, 19:11:44 »
Yet another Honda built....one day I'll do something different!

You just keep doing the beautiful work you're doing - it's an inspiration for the rest of us mere mortals .............  always an Aer Macchi ?????
"if at first you don't succeed, you've already been a failure once"

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