liner machining

Here you can talk about all kind of TECH for the B50 B44 B25 And Other BSA unit Singles

Moderator: minetymenace

Post Reply
User avatar
Posts: 95
Joined: Sat May 11, 2019 3:14 pm
Location: Orleans
Has thanked: 23 times
Been thanked: 1 time
Flag: France

liner machining

Post by FGF » Tue Jun 09, 2020 9:53 am

Hello ,

with a B50 stock conrod ( 41-550 for B50-B44 ) is it usual to machine the cylinder liner like this ?
Gerry answered me quickly and i thank him but
i 'd like to understand why the factory didn't design a suitable liner for it 's conrod ..

Changing conrod is not a '' plug and play '' way ?

Posts: 1294
Joined: Fri Sep 03, 2004 11:45 am
Location: Canberra, Australia
Has thanked: 0
Been thanked: 14 times
Flag: Australia

Re: liner machining

Post by Canberra » Tue Jun 09, 2020 1:39 pm

Could it be the original hepolite piston had a long skirt. Maybe they needed the liner to be at a sufficient length but the con rod and bottom of the liner proved a conflict. That created the need for the cut outs on the lower sleeve. With modern short skirt pistons maybe the liner could be shorter and fully machined off?

Not possible to see the relationship when all is assembled but a CAD drawing may prove it can be shortened without an issue?


Post Reply