Conrod Bushes
Turbo Mini Forums

I have just brought some fully floating Omegas and am now looking at getting some bushes made and fitted into the small end of the rods. Can anyone who has done this give me a rough idea of how much i should be looking at paying for this to be done. This is one of the last things to get done before i start to put it all together.

Any comments of help would be appreciated.

Thanks
Luke

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=9898

searchin is fun

That sir, is not rust, it is the progressive mass reduction system

http://aseriesmodifications.wordpress.com/

You are right 'Searching is fun', that is why i done it first!!

I have had a look at that thread and there is nothing in there that says about bushing the rods, only says about teflon buttons.

I am trying to find out about the gudgeon pin going through the rod, at the moment it doesn't fit!! I want to run a (bronze?) bush in the small end, that is what i am trying to find out. So if anyone has any info on this it would help. I do remember reading that some people have done this but cannot find much info in it.

Thanks
Luke

If the gudgeon pin doesn't fit, then it is not fully floating.

Why do you feel that you cannot just get the pins press fitted as usual?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Schrödinger's cat - so which one am I ???

I am led to believe that with the 18cc forged omegas with the fully floating bush, you need to bore the small end out. And then fit the bronze bush. That is why the pins do not fit through the rods at the moment.

And the reason why i went for the fully floating option was that it should be far easier when it comes to rebuilds. Thats the plan anyway.

Luke

sounds like rubbish to me,

std gudgeon pins are 810 thou IIRC,

i think the bush type are 18mm (about 700 thou) which would fit the rod like a turd in a top hat.

Can anyone tell me what the difference between the fully floating with circlips or fixed press type pistons are then?

I have just measured the gudgeon pins and they are 812 thou, so i take it that they are standard size. So the difference must just be that the pistons have circlips. So to make these floating i need to bore the small end out.... And i am looking at fitting a bush in there as surely having a bearing face is better than the pin running straight on the rod.

Luke

Edited by LukeAnsley on 2nd May, 2008.

Sorry, I didn't realise Omega made a version specifically for a bushed rod end, I've only ever used interference fit pins (other makes of piston).

I've just checked the web and they do, complete with circlips, and it says (as per mini13 above) that the pin is 18mm, ie, a lot smaller than a standard one (standard is over 20mm).

If your gudgeon pin doesn't go in the rod end currently, then maybe you have the inerference ones anyway.

So did you get supplied the bronze bushes with the type you chose ???

Anyway, around here, any decent machine shop would charge by the hour and I wouldn't want them to rush a job like that.

Schrödinger's cat - so which one am I ???

Maybe you've been mis-supplied ?

I would assume the ones designed for fully floating have the smaller pin so the bush goes in the current rod end (ie, press the bush into the current hole and ream the bush bore to size for the smaller pin, rather than having to enlarge the rod end hole).

I (personally) wouldn't want to enlarge the hole in the rod end to fit a bush for a standard size pin - look at the amount of metal there is there, not much to start with.

Schrödinger's cat - so which one am I ???

depending on how many miles you intend to do, you can get away with just honing or reaming put the little end, the pin runs straight on the rod material, . when rebuilt this winter there was not a mark on the pins, thats what the oil is there for.

carl.

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

I had read that some people were running the pin straight on the rod, and by the sounds of it with good results. The car might be doing quite a bit of mileage so that is why i liked the idea of running a bush.

I have just been to a local engineering firm that i have found, who specialises in engine components. They are going to bore the rods out, make a bush and then fit and hone the new bush and drill an oil hole on the end of the rod. They are doing this for £90 for the 4 rods, so not too bad.

I will let you know what they are like when i get them back.

Thanks for the info

Luke

The omegas come with circlips so that you can run a floating pin if youu ream or bush the little end like you have said. Or you can use them without as a interferance fit.

Steve @ MED will be able to assist as the Omegas I have required this operation (73.5mm flat tops thou)

On 5th Sep, 2011 Vegard said:
I stand corrected. You should know

Just thought i would let you know i have got the rods back from the engineering company today. They bored the rod out, made the bush, fitted the bush and honed it. And also drilled an oil hole in the end of the rod.

They look good so now there is no stopping getting the engine together.

Luke

looks like a tidy job,

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE