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BBC steams after running
Hi - I have just finished a BBC rebuild....runs great...increased CR, cam and bored...OE heads cleaned up and am running standard Mercruiser exhaust.....after running higher speeds (~above 4000), I noticed when I go back to idle I have light steam....especially out of the port bank, some on starboard side....the motor runs and idles fantastic....suspect water restriction somewhere. Should I change the manifold/riser gasket bleed hole, or is that business as usual for BBC?
Thank you for your feedback! |
Normal steam at idle. There are many threads addressing the issue.
Are your temps good? |
I could not locate the other threads... but will look better! My temps are very good. Thank you for the input...I guess there’s nothing I can do about it. |
Do your due diligence and make sure there is not an issue.
There's a few threads in this search. https://www.offshoreonly.com/forums/...archid=1315866 |
Rookie- for some reason the link did not work. Would you mind reposting? Im not sure what else I can do but watch temps. The engine comes down just fine to an idle... thank you for the input! |
How cold is the water? When I boat in 70° water there’s no steam but when I boat in the 55° bay there’s plenty of steam. |
Yeah.... it’s probably 75ish.... only steams for 10 sec or so hen come off a run |
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I noticed steam for the first time coming out of the breathers this weekend. This was after firing up the boat and running it a few miles at 4200 RPM? It has been a little cooler up here, popped the hatch right after coming off plane, a little steam coming out. Everything looks great, no changes in the boat besides the weather outside. I chalked it up to cooler water / air temps. Boat sure ran good!
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Thank you! Seems like if I run 3000-3500 rpm it’s ok, then over 4000 it steals a little....it’s getting colder too! |
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