• Hi Guest!
    If you appreciate British Car Forum and our 25 years of supporting British car enthusiasts with technical and anicdotal information, collected from our thousands of great members, please support us with a low-cost subscription. You can become a supporting member for less than the dues of most car clubs.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

Vented cap on damper piston on top of BJ8 carbs.

Share this page

J

John_Progess

Jedi Warrior
Country flag
Offline
Are the caps for the damper piston on top of the BJ8 carbs supposed to be vented or not and are they plastic or brass. Mine are not vented and are brass. I do not see a hole drilled into the boss on the dome to vent the top so I am guessing that the cap should be vented. Thanks and have a good day!

John
 
Re: Vented cap on damper piston on top of BJ8 carb

Hi John,
They should be the plastic vented one. Small hole off center.
 
Re: Vented cap on damper piston on top of BJ8 carb

suprgnat said:
My Phase 1 has vented brass caps.
Yep everything became cheaper as they headed for 1967
Click to expand...
Keoke :frown:
 
Re: Vented cap on damper piston on top of BJ8 carb

Mine were plastic and the thread had been stripped from one of them and it kept coming off so they were replaced with brass ones that are vented - slightly off-centre as AUSMHLY suggests.

They look far more pleasant.
 
Re: Vented cap on damper piston on top of BJ8 carb

Keoke said:
Yep everything became cheaper as they headed for 1967
Keoke :frown:
Click to expand...
Cept fer that thar wooden dash. :laugh:
 
Re: Vented cap on damper piston on top of BJ8 carb

I second that thought. I installed the brass top units that don't strip out or worse, crack out under sever duty (aka vintage racing). They have an off-set breather hole in the top.

Dougie
 
Re: Vented cap on damper piston on top of BJ8 carb

Per Concours Registry:

Dashpot caps: Up to and including early 29D series 6-cylinder engines, the dashpot caps were unfinished brass, hexagonal in shape. On later 29D series (after # 6395) and all later engines, the caps were black plastic with a "wavy" outer edge, and the part number stamped across the center (e.g. AUC 8103).
 
Re: Vented cap on damper piston on top of BJ8 carb

:savewave:
Per Concours Registry:

Yep Roger, but like Dougie said they still broke all to bits.---Keoke- :devilgrin:
 
Re: Vented cap on damper piston on top of BJ8 carb

Interesting that the Concours Registry did not mention the air hole/vent in either the brass nor plastic.
 
Re: Vented cap on damper piston on top of BJ8 carb

AUSMHLY said:
Interesting that the Concours Registry did not mention the air hole/vent in either the brass nor plastic.

Well that is because sometime they just be printing what someone told them and probably they ain"t never seen one.
Click to expand...
----Keoke---The AZ :cowboy:
 
Re: Vented cap on damper piston on top of BJ8 carb

I had a black cap blow from a "back fire". Shot the rod through the black plastic cap. I replaced both but carry a spare which happen to be brass(drilled). The black ones came from Moss with out the vent hole. Dave Russell said it must be vented if the dash-pot (dome) did not have the proper vent in that angle part at the top.
 
Re: Vented cap on damper piston on top of BJ8 carb

Either the caps are vented or
a hole has been drilled into the boss on the dome to provide the required venting.---Keoke
 
Back
Top