SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: 79charger on May 20, 2011, 03:13:34 PM

Title: Whats the Ideal Rpm for the vaccum secondaries to kick in .....???
Post by: 79charger on May 20, 2011, 03:13:34 PM

I am messing around with my spring selections with my my Holley 750 vacuum secondaries. I have a mini day cruiser with a BBF , and a motor that runs around 4800 to 5000 rpm . Whats a good rpm to have them start opening ??

Title: Re: Whats the Ideal Rpm for the vaccum secondaries to kick in .....???
Post by: 81galaxy on May 20, 2011, 05:56:18 PM

I know how i do it is put the lightest spring that works without bogging and dont worry about what rpm they kick in.
Just my .02 Tom

Title: Re: Whats the Ideal Rpm for the vaccum secondaries to kick in .....???
Post by: IRRebel on May 20, 2011, 08:07:39 PM

Quote from: 81galaxy on May 20, 2011, 05:56:18 PM

I know how i do it is put the lightest spring that works without bogging and dont worry about what rpm they kick in.
Just my .02 Tom

Pretty much it. Start light and work up 'til it doesn't bog when you flatfoot it is how I do it.

Don't forget to read your plugs as you're going along though. Could be chasing your tail if jetting, etc is way off.  ;)

Ray