HD8 Carbs Do Not Return to Idle

[Rabbits 32]

Hi All,

I have a carburettor problem that is driving me around the bend.

I sent my 1964 BJ8 HD8 carbies to the best carby restoration company in Australia as my car had high idle speeds when running which I couldn’t get down by adjustment. Reports from the repairer said that the brass bushes were severely worn and they totally rebuilt both carbies replacing just about everything in both.

I got them back and its now worse with the engine holding whatever revs I take it up to while going through the gears once it heats up to 165 degrees, strangely it is OK will the engine is cold. Eg if I rev to 3000 revs into 3rd then the engine revs stay at 3000 revs unless I push the clutch in and ‘blip’ the accelerator. It holds even the slightest increase in revs and is near impossible to drive.

Even though the carbies still stick after disconnecting the linkages altogether, I pulled the linkages out and rebushed/ refurbished everything. Adding spring pressure to the return springs only makes it worse. Additional springs make it worse. I have sent the carbies back (twice) and the repairers found that it had a bent butterfly shaft and replaced shafts and bushes.

I got them back and fitted them and they are no better.

I fitted another set of carbies of a unfinished restoration that had been rebuilt by the same company and the car ran fine.

Wayne

 

[BobHaskell]

Have you done a dashpot drop test? University Motors - Matching SU Air Pistons

 

[AUSMHLY]

Hi All,

I have a carburettor problem that is driving me around the bend.

I sent my 1964 BJ8 HD8 carbies to the best carby restoration company in Australia as my car had high idle speeds when running which I couldn’t get down by adjustment. Reports from the repairer said that the brass bushes were severely worn and they totally rebuilt both carbies replacing just about everything in both.

I have sent the carbies back (twice) and the repairers found that it had a bent butterfly shaft and replaced shafts and bushes.

I got them back and fitted them and they are no better.

I fitted another set of carbies of a unfinished restoration that had been rebuilt by the same company and the car ran fine.

Wayne

I feel your pain Wayne. Seems like this shop isn't the "best"...on confirming everything as been addressed.

One would think that the first time a total rebuild would do it.
You send them back to find a bent butterfly shaft. How did that get overlooked?

"I fitted another set of carbies of a unfinished restoration that had been rebuilt by the same company and the car ran fine."
If you have the time, I'd keep sending them back to them. 3 times now? If your shipping them, I'd have them pay for shipping both ways. That may be the incentive for better quality control. I'd also point out to them that you're using them because your understanding is they are the best. Point out you've tried another set they rebuilt that worked as intended.

PS. have you checked you timing?

Best of luck.