When my car gets to about 4500 RPM a funky kinda groan like sound happens? Should i take it super easy on my car? Or is this because the rotor is spinning super fast?

 

You carbureted? Coincidentially, thats about when the seccondaries kick in.

Give some more info.

 

Mine kicks in hard at 3000RPM, below that they kick in, but it's not as forceful. Then again, at 5000RPM and above, my power drops off dramaticaly and it vibrates badly at 6000RPM. Might be my flywheel. I'm not done troubleshooting my 13B yet.

Isn't there some sort of honking noise that an emssions device produces? Or was that at idle? Just throwing questions out there.

 

mine does that at about 2500 when i have a lot of load on it (in 4th gear and trying to accelerate or something).

 

Ya my car is carburated. I cant really describe the sound either its just weird.

 

Does it happen and go away quickly or does it happen and keep happening until redline?

 

It doesnt go away, i dont know if it goes all the way to redline because i dont push it to that but ive almost been there and it still happens.

 

Yes. it is problem with karb.

 

coasting valve? Vacuum secondaries coming in too soon Did you remove the spring to make it mechanical linkage to bypass the vacuum?

 

Just wonderin..how can you be sure that the secondaries are opening? Because i really dont feel or hear anything different as i hit 3000-5000 range...

Hum..didnt see that this post is old as hell..grr.strop bringing back old posts! Its confusing!

 

Just to clear it up it was the air pump, it was disconnected and was making crazy sounds.