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MG Rocket
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PostPosted: Sat Feb 06, 2010 5:41 pm 
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1275cc
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Location: Port Stephens, a little north of Newcastle, Australia
Std Cooper S rod - 690 grams
Std 1275 rod - 650 grams
These new rods - ?

These new rods are a "H" pattern.
Most rods are an "I" beam pattern.
What is the advantage of "H" pattern rods?
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drmini in aust
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PostPosted: Sat Feb 06, 2010 5:43 pm 
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Location: near Baulkham Hills, NSW
Lighter for the same stiffness.

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aaron
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PostPosted: Sat Feb 06, 2010 6:37 pm 
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475g I would say :wink:

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winabbey
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PostPosted: Sat Feb 06, 2010 6:38 pm 
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MG Rocket wrote:
Std Cooper S rod - 690 grams
Std 1275 rod - 650 grams
These new rods - ?

The weights were written in texta on the two rods in GR's photo.
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MG Rocket
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PostPosted: Sat Feb 06, 2010 7:03 pm 
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Location: Port Stephens, a little north of Newcastle, Australia
winabbey wrote:
MG Rocket wrote:
Std Cooper S rod - 690 grams
Std 1275 rod - 650 grams
These new rods - ?

The weights were written in texta on the two rods in GR's photo.

Ah ha.. 548g and 475g... quite a difference.... I wasn't very observant. :oops:
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aaron
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PostPosted: Sat Feb 06, 2010 7:11 pm 
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Blinded by the bling! :D :lol:

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winabbey
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PostPosted: Sat Feb 06, 2010 7:21 pm 
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MG Rocket wrote:
Ah ha.. 548g and 475g... quite a difference.... I wasn't very observant. :oops:

The top one is heavier than the bottom one because they used very dense ink to print the SC logo and name on it :shock:
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benjamin
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PostPosted: Sun Feb 07, 2010 12:15 pm 
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Location: Leonay nsw
GR wrote:
Hi Kev
you can run the 1275 rods in the small bores, ihave them in my formula juniour motor, you just have to push the piston out of the bottom of the bore, fit the pin through the piston and rod then push it back up into the bore i use teflon buttons when i do it that way i have at least 8 race motors using the big rods, just be very careful when pulling the pistons out the bottom you don't pull it out to far and let the rings pop out,
BIG PROBLEM.
Graham Russell


what size bore would they need to drop in?

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GR
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PostPosted: Sun Feb 07, 2010 7:55 pm 
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Oh dear, worry, worry...

Joined: Fri Jun 19, 2009 5:31 pm
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Location: North Rocks
Hi Ben
Sorry, bigger than you can bore a small bore out to,
can you give me a ring when you get a chance please
Graham

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benjamin
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PostPosted: Sun Feb 07, 2010 7:56 pm 
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no worries ill ring after work tommorow maybe ill pop around :)

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norm74
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PostPosted: Tue Feb 09, 2010 7:33 pm 
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why arent they bushed in the small end? Most aftermarket rods come bushed(Chev, Ford etc) these are all H Beam as well. wouldnt it be better if the small end is bushed less friction etc.
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drmini in aust
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PostPosted: Tue Feb 09, 2010 7:41 pm 
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You then need to use circlips, and in a long stroke Mini at high RPM, they do break. That's why the Cooper S and all 1275s have a press fitted pin.
It's debatable whether friction is any less using a bush, as the piston is a looser fit on the pin than the bush is, at operating temp.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Last edited by drmini in aust on Tue Feb 09, 2010 7:43 pm, edited 1 time in total.

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norm74
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PostPosted: Tue Feb 09, 2010 7:43 pm 
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why not teflon buttons, thee not that hard to make.
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douglas42l2
 Post subject: Lightweight conrods
PostPosted: Mon Jul 12, 2010 2:45 pm 
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If anyone is looking for a set of these conrods Lindsay Seibler has advised that the price drops by $100 to $580 if two sets are ordered.

I need a set so if someone wants a set we could both benefit.

You would pay for your set separately and have them sent to you directly. We just need to order at the same time, so keep me posted if you want to order.
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850man
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PostPosted: Mon Feb 07, 2011 9:40 pm 
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Location: Lemmings, everywhere.
How are these rods going in engines, esp race motors? Has anyone had any problems with them? They seem too cheap for what you get, I would like some feedback before I buy some, my engineer will make a set of rods for me out of titanium but they will cost a fortune, so I would like to try some of these new rods. Dont get me wrong, I think these rods are great but would like some positive stories before I buy a couple of sets of them.

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