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Blower surge Make it stop

Old 01-17-2017, 02:25 PM
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Eliminated572 Ive yet to try it at 1000? I can make mine idle at 1000 smooth, just when its surging I can't get out if its over 900. So maybe its loading too hard on the serge and wouldn't on 1000. Ill have to try and see??? Thanks for the info!!

Maybe the Mythical Blower Fairy will look down on me with positive results! LMAO
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Old 01-17-2017, 02:41 PM
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First or all, before spending a ton of money on expensive ignition systems you need to verify a bunch of things. I don't run locked timing, have MSD with mechanical springs so you don't need a Daytona to get it right. I always tune my engines to have zero surge.

If you can't do it with mixture screws, you may need to open the secondary butterfly on the carbs because you might be going slightly past the idle air slot and it's not happy. A lean surge will be longer and weak, a rich surge will be quicker and more pronounced. I can't take the time to post all of the things to check because it takes time and refinement of everything to get it right but you can PM me and I'll be happy to talk on the phone.

https://youtu.be/wS_N97plE3o
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Old 01-17-2017, 02:50 PM
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Originally Posted by MILD THUNDER
Transmissions. We don't have bravo's.

Although, I don't think 900rpm, should be an issue for a bravo drive. Im not super up to speed on the bravo stuff, so maybe someone else can chime in
900-1000 is fine depending on the engine and camshaft.

He has a small cam which could be one of the reasons its surging. I've seen that before.
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Old 01-17-2017, 02:54 PM
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Originally Posted by Panther

That sounds solid and wicked, but did you know that your boat was blowing gay rainbows? Lol
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Old 01-17-2017, 03:02 PM
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lol...

Out of gear they are about 950, in gear 500-600. I don't ever have to mess with throttles or anything, just dump in and out of gear. A good friend said to me last year; "965hp and we go boating trouble free all day and dock it like it's a 454 mag."

Here's more rainbows on the 2nd engine with the power steering.
https://youtu.be/EeOna_qS7Fg
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Old 01-17-2017, 03:10 PM
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Just checked over an old video. Right at 1000rpm

https://youtu.be/zogQm3ROlH8
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Old 01-17-2017, 04:08 PM
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This shows the idle quality and driveability better; https://youtu.be/IYbudYsSfvQ
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Old 01-17-2017, 04:15 PM
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Panther what do you idle at? It sounds like much more cam than mine so im sure that is part of my problem! I will PM you would love to find out what you did!
Eliminated572 yours sounds like way more cam then mine also! And you go in and out with no problem at 1000?

I went with the profile I have working with Comp Cams on that making reversion a real concern but with the fast surge idle I have im sure I am getting reversion at this point. Another reason im so intent on getting rid of it!
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Old 01-17-2017, 04:22 PM
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Originally Posted by havasubrian
Panther what do you idle at? It sounds like much more cam than mine so im sure that is part of my problem! I will PM you would love to find out what you did!
Eliminated572 yours sounds like way more cam then mine also! And you go in and out with no problem at 1000?

I went with the profile I have working with Comp Cams on that making reversion a real concern but with the fast surge idle I have im sure I am getting reversion at this point. Another reason im so intent on getting rid of it!
Well, I did get about 500rpm drop. But that was 1.36 gear with 35p 5 blade props... I had idle AFR around 14:1 there... The more vac (timing) and idle circuit fuel I gave it, the better she responded. Now this is to a point. Going too fat worked me the wrong way... In the mid 13's for me was butter zone.
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Old 01-17-2017, 04:23 PM
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950 out of gear, 500-600 at dead stop idle in gear. You can see it in the last video I posted.
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