• Hey Guest!
    British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
Tips
Tips

rpm's [ Typical Idle RPM ]

Share this page

J

joeq

Jedi Hopeful
Offline
is there a rule of thumb as where the tach should be when idling and, for that matter, in each gear?

as always, thanks for the education!
 
Re: rpm's

I idle between 600 and 800 RPMs. When it gets real hot, the idle drops - and sometimes stalls if I don't pull the choke out in time. I believe I am about 3000 RPMs at 60 MPH
Bill
BT7
 
Re: rpm's

"Joeq"
AS a rule of thumb I think you will find most Healey Tachs positioned around the 1000 RPM mark at idle. Which generally corrosponds to a reading of 600-To-800 RPM when checked against my Pensky analyzer. In each gear just stay out of the Red Line. /ubbthreads/images/graemlins/laugh.gif-Fwiw---Keoke
 
Re: rpm's

/ubbthreads/images/graemlins/savewave.gif Bill!
Since the SU carbs do not have temperature comphensation,when the engine reaches its full runing temperature [HOT] the Idle speed generally increases rather than decreasing.In my cars I set the Idle speed about 200 RPM low at a running temp around 160 Deg F,which requires that I run on choke for a short period to maintain a steady 800 RPM Idle. This has been my experience with all hot runing engines equipped with SU carbs. Consequently, you may want to have a look at your overall tuning and see if your car will respond accordingly-FWIW---Keoke /ubbthreads/images/graemlins/driving.gif
 
Back
Top