Offshoreonly.com - steam out exhaust

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Its almost always something really, really simple and cheap.

Sounds like you found it with the impellor.

For me, sometimes its just junk in the sea strainer: a slightly restricted cooling water flow.

Quote:

Originally Posted by picklenjim (Post 2864102)

MSD's work great.They really helps keep your plugs from fouling at idle speeds around the dock when running bigger cams and carbs.What cam,intake and carb are you running now?Do you know what your compression ratio is?I don't know how you are setting your timing but you should set it when it is fully advanced.Hook up your timing light and direct it on the timing mark.Have some one throttle it up while you watch the timing mark advance.When it stops advancing and holds steady,usually about 2500-3000,set it at 38 degrees.If your balancer isn't numbered that high you can get a timing tape to put on it at your local speed shop.Need to know your balancer diameter though.This would be a beginning for your tuning.Your doggieness surely has nothing to do with the MSD.

Its a 454 mag mark 4 block forged intenals. A msd complete ign. (dis,coil,wire,ect) blue box, holley DP750cfm carb upgraded fuel pump,roller rockers, roller lifters, hydro roller cam 283 290 223 230 .566 .575 114° and a single plane hp500intake all brand new parts and fresh rebuild from KEITH EIRCKERT PERFORMANCE (parts). Also anyone have any idea on horsepower rating kinda trying to figure out so i can get back with the GREAT PPL AT B BLADES:ernaehrung004 thanks

o comp is around 9. 3/4 or close to stock not really sure.

First of all i would get rid of the 500 intake and stick a dart or Team G on there if u really go for power ?!

Also ,,who built the engine ???
That would be the guy to ask about timing !

Something just does not make sence !!

I don't know if you changed pistons or not but a 454 mag only has 8.6:1 compression.That's a pretty stout cam for that compression and 454 inches.Lot of lob separation too.Probably should have at least 10.5:1 compression. Also good headers.I'm not familiar with the thumper manifolds.That motor probably won't hardly run going silent.Single plane manifolds are usually good for higher RPM's.A good dual plane will give you better acceleration and mid range.Single planes are for WOT.Be sure you have a good fuel pump.If mechanical at least a holley high out put marine pump.If not you can lean it out at WOT and then you'll be dropping exhaust valves.Best in a marine engine to use Manley Inconel exhaust valves.Marine engines have extreme exhaust temperatures.How many RPM's are you getting at WOT?What size boat and prop?I would think it would make around 500 to 550 HP.You need to know your WOT rpm's to determine you prop size.

I know you guys kinda got off the steam subject, and on to timing. But depending on water temp, wouldn't you see a certain amount of steam regardless?

Shouldn't see steam at all really. With a constant flow of water no part of your engine will be hot enough to create steam. The only time you will get steam is if water goes where it is not supposed and comes in contact with parts it is not supposed to.

I dont know where you guys boat but up in Seattle I see steam coming out of everyones exhaust (especially this time of the year). Water temp is 55-60 degrees and you will see steam!

i think lake temp would play a big part in steaming,

Quote:

Originally Posted by johnnyboatman (Post 2865621)

i think lake temp would play a big part in steaming,

OK,,,but why does 1 engine run fine and the other one steams ?????/ mmmmmhhhhhh:party-smiley-004: