free hit
Coughing Carbs - Fuel System/Carbs - The Lotus Forums #ForTheOwners Jump to content

Coughing Carbs


Recommended Posts

Me again, just to ask another daft question, it cant be a good thing when the carbs spit back through the intake and pop and bang?

They were rebuilt by a mate who used to do a lot of them on old alfa's, so i guess he knew whats what. Just wondered if there is somewhere i can send them so i know for sure they are good?

Could the ignition be to blame also? It has been adjusted myself with a good gun, but seems to not idle very well when set to 9ish deg btdc.

I gotta get my car to someone who know's what they are doing before i blow it up completely!!

(good fun though) :thumbsup:

Link to comment
Share on other sites

Upgrade today to remove Google ads and support TLF.
  • Replies 3
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Tuning is a bit of an art - only if you do it half-hearted. Simply, there are several influencing parts to tuning that need to be checked, preferably in sequence:

1. Check float levels

2. Set timing (I thought it was about 6 deg BTDC(??))

3. Set dwell

4. Set synch between carbies

5. Check timing again

6. Adjust idle mixture rates

7. Steps 5 and 6 again.

When I check for timing, I double check against the front pulley, just in case someone has miss-marked the flywheel.

You will need some tools for synching the carbs and adjusting the idle mixture rates, or there are some non-tool techniques here:

there are lots of tuning topics in the search area of LEF too.

Spitting carbs after all that has been checked could be an inlet valve issue - compression check.


Link to comment
Share on other sites

Yep sounds like your timing is out mate.

Do you think this is why the rpm doesnt droop of instantly when the throttle is closed too?

I think i will see if i can nurse it along to mike after christmas, i am only going to make things worse i reckon. :thumbsup:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...