Hone big end housings to true

[MickG]

From what I have heard they were the same place a long time ago but not anymore and Buton Power do not point people in the direction of Burton Engineering.

That is interesting and confusing
Next time i'm in there I will ask again.
Mick G

[tcsoar]

Mick

If you are going to visit Burton Power, Burton Engineering is right between their two units. It has a small shop front and is clearly signed Burton Engineering. It is where I had my engine checked and work done to the head.

Chris.

[Witofthestaircase]

Invoice attached, for information

[Jason1]

Hi

Gosnays are a good company and been around for a long time.
I don't think you have anything to worry about with the quality of their work.

Jason

[MickG]

Seeing as a few people know Burtons and Gosnays drop me a PM next time your in the area and pop in for a cuppa and a chat
Regards Mick G

[ill_will]

Hi all,

Relating to the original post, does anyone happen to have the spec for the big end 'housing' bore for a standard 125E con rod please? I mean the bit the bearing shell sits in rather than the bore of the bearing itself. The workshop manual I have lists the big end running clearance (0.0005/0.0022") and the small end bore, but I can't find anything about the housing itself, either diameter or ovality.

Thanks for any assistance,

Will

[rgh0]

ACL bearing catalogue specification for the twin cam con rod bore 52.896 to 52.908 mm

cheers
Rohan

[Billmack]

Rohan is generally right. Most engines I rebuild have those bores trued up. The honing system used does in fact true up any out of round or tapered condition. Any of this however does not make the center to center distance on the rods the same. This is generally fixed by replacing the small end bushings and recutting them with a Tobin Arp or similar machine. It has come to be described as "tobin arp'ing" the rods. This also ensures that the two bores are parallel to each other. In my experience most rods have a certain amount of bend and or twist in them. Just a question of how accurate your measurement system is. When you spin over an engine lower end by hand that has this and an accurate line hone done you will feel the difference.

[ill_will]

Thanks both. Looks like mine are a fraction over so I'll need to get them done.

That ACL catalog is useful to know about - https://www.aclraceseries.com/images/catalog.pdf for anyone who needs it.