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Originally Posted by KAAMA
(Post 4409860)
I do not claim to be any kind of an expert, but I think if your carb guy would "boost reference" your carbs that it would help kill the surging/hunting problem for you. Perhaps someone else can chime in about boost referencing a carb for blower apps.
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Originally Posted by KAAMA
(Post 4409860)
I do not claim to be any kind of an expert, but I think if your carb guy would "boost reference" your carbs that it would help kill the surging/hunting problem for you. Perhaps someone else can chime in about boost referencing a carb for blower apps.
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Originally Posted by KAAMA
(Post 4409860)
I do not claim to be any kind of an expert, but I think if your carb guy would "boost reference" your carbs that it would help kill the surging/hunting problem for you. Perhaps someone else can chime in about boost referencing a carb for blower apps.
The only way the power valve will cause an idle issue, is if the diaphragm is ruptured, and the engine vacuum is pulling raw fuel thru it. |
Originally Posted by HTRDLNCN
(Post 4409855)
I have the reverse problem,, stock 454mag with stock cam and a B&M420 blower,,idle surges like crazy,
stock cam pulls too much vacuum and when blower surges vacuum drops,,it will swing from 18" of vacuum to 8" of vacuum,,had carbs gone thru twice by Dan DaVinci with no imprvement,,he has tried every trick in the book,,idle will not settle down unless you lean it way out and then you cant put it in gear without it dying.. I had this same setup on my last engine, 509 with custom cam and idled perfectly at 10-12" vaccum. vid: https://www.facebook.com/Frank.No.Pr...type=3&theater |
Also going to a milder cam, smaller cid, and etc his carbs need either idle air bleed and/or idle feed restriction change.
Originally Posted by HTRDLNCN
(Post 4409855)
I have the reverse problem,, stock 454mag with stock cam and a B&M420 blower,,idle surges like crazy,
stock cam pulls too much vacuum and when blower surges vacuum drops,,it will swing from 18" of vacuum to 8" of vacuum,,had carbs gone thru twice by Dan DaVinci with no imprvement,,he has tried every trick in the book,,idle will not settle down unless you lean it way out and then you cant put it in gear without it dying.. I had this same setup on my last engine, 509 with custom cam and idled perfectly at 10-12" vaccum. vid: https://www.facebook.com/Frank.No.Pr...type=3&theater |
I like a little surge . With my single its easy to shift it into gear and time it coming down . All this talk is starting to get me motivated for spring. To bad we are getting pounded with another snowstorm right now.:musik010:
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Originally Posted by JFletch
(Post 4410283)
I like a little surge . With my single its easy to shift it into gear and time it coming down . All this talk is starting to get me motivated for spring. To bad we are getting pounded with another snowstorm right now.:musik010:
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Mine surges enough at idle speed to make it a target of "no wake" policing. Thinking I need to fix that... but dam if it isn't cool!
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Been running blowers for a long time and I've never had any surge. When I hear a big cube blower motor with carbs that has little to no surge, I smile because the person took the time to tune it.
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I know mine needs to be be tuned in the boat... didn't surge on the dyno. Once the blower comes back from the shop, I'll be able to work on it some. I don't really want it to surge.... makes things a pain.
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