|
|
|
08-09-2010, 09:11 PM
|
|||||
|
|||||
|
Idle RPM goes down when dual electric fans are switched on
Hey fellas,
When I switch on my dual fans the RPM drops noticeably. I just put in a 100 amp 1-wire alternator. It was not doing this before the new alt. but the old one was not charging at all. Thanks. 
|
|
08-10-2010, 06:52 AM
|
|||||
|
|||||
|
The alternator is causing the rpm drop because of the additional electrical load imposed on it by the fans, especially when they first come on. As the electrical demand increases, the alternator will become harder to 'turn', thus the drop in idle rpm. This is not so noticeable when the engine is above idle such as when driving. My T-Bucket does the same thing when the fan comes on (I'm running a CS130 alternator).
|
|
08-10-2010, 06:55 AM
|
|||||
|
|||||
|
one wire alt's
those things don't like to charge at idle. but do fine running down the road.. just like rocks said.. big draw will reduce rpm's. i have one also and does exactly the same. but runs 14v down the road..
|
|
08-10-2010, 01:00 PM
|
||||||
|
||||||
|
Ditto what the others have said about the drag of the alternator. If it really bugs you, you could install an idle kick up solenoid like they use for A/C.
Vince
|
|
08-18-2010, 03:31 PM
|
|||||
|
|||||
|
Thanks fellas,
I just raised the idle 200rpm. It sounds even nastier. 66 Caprice 538 HP 383
|
|
|
| Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
| Thread Tools | |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| motor wont idle at less than 2200 rpm | Pupsvette76 | Engine | 30 | 08-06-2010 05:02 PM |
| Carb tuning issues - 750 speed demon | lightningcow | Engine | 57 | 07-01-2009 07:32 AM |
| Edelbrock 750 tuning | GCD1962 | Engine | 42 | 04-16-2008 06:03 PM |
| Help tuning 383 for street use | strokey | Engine | 34 | 04-11-2008 05:51 PM |
| Idle in Park is 1,800 RPM....Idle in gear in 900 RPM...Way too High. | white66coupe | Engine | 11 | 09-10-2004 11:49 AM |
