LT1 Bogs Down Somtimes
Thread Starter
Instructor
Joined: Aug 2011
Posts: 131
Likes: 9
LT1 Bogs Down Somtimes
I have a 71 LT1
Engine was rebuilt, carb re-done, plugs, filters, etc all changed
Sometimes and only sometimes if I push it at app 3500/4000 rpm's it feels like almost a rev limiter is in place
Any ideas?
Car does run incredibly strong, and this problem only occurs sometimes
Look forward to everyone's help!
Engine was rebuilt, carb re-done, plugs, filters, etc all changed
Sometimes and only sometimes if I push it at app 3500/4000 rpm's it feels like almost a rev limiter is in place
Any ideas?
Car does run incredibly strong, and this problem only occurs sometimes
Look forward to everyone's help!
Race Director
Joined: May 2006
Posts: 18,734
Likes: 2,582
Have you checked the primary and secondary float levels?
When the carb was redone did they install fuel filters in both float bowls, if so have you checked them for dirt?
Have you checked the distributor advance to see if it is binding?
When the carb was redone did they install fuel filters in both float bowls, if so have you checked them for dirt?
Have you checked the distributor advance to see if it is binding?
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
If you can hear the secondaries kick in and then it just turns into a huge bog, it's the spring tension on the secondaries is too loose. Letting them open up too far, too soon as the case when you wack it at 3500 rpm, it will just groan with no pull.
It's an easy adjustment but go to YouTube because it's almost impossible to explain it in words, where it is and how to turn it because it's a tiny screw.
All said and adjusted, the secondaries should barely open by reving it in neutral
They will open fully in gear and running down the road.
It's an easy adjustment but go to YouTube because it's almost impossible to explain it in words, where it is and how to turn it because it's a tiny screw.
All said and adjusted, the secondaries should barely open by reving it in neutral
They will open fully in gear and running down the road.
Le Mans Master
Joined: Oct 2010
Posts: 6,937
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
if its the original Holley carb there is no adjustment screw for the secondaries/ you would need to change the spring. the secondary diaphragm could also be bad. it is hard to say what and how far someone went with carb rebuild.
