Logs/Snails Question

[Devilman]

What is it exactly that the snails do on log exhaust? Serve as sort of a P trap (for lack of a better description) to keep water from gettin into the engine.... muffling engine noise... ?

While I have been looking around for a set, I ran across this pic. Guy has logs, but no snails it seems, just some elbow type fitting that turns the exhaust on a down ward angle to go thru the transom.  It does have water lines going to them, to cool the flexible hose I assume?

Just curious if this setup is something I could run & what would be the reason for this over the other.

Thanks!

 

[UNCLE SAM]

Usually you will find that boats with snails have the exhaust manifold outlet at or below water level. Yes "P" trap type of thing to prevent water from traveling up the exhaust.
I have seen otherwise though. TaylorSJX2 from the Taylor board has an SJ with a small block in it that has a small riser like in the pic you put up.

 

[spd500]

I think I read somewhere that the ones like you posted were v-drive exhaust . I don't see why you couldn't run them on your jet boat though . My old 64 Stevens had that setup on it , I never had any problems with it . I do remeber the guy I got the boat from having problems with the hoses when he first got it . I think he melted the hoses because the water was not routed correctly or something like that .

 

[Sharkbit]

Make sure you got some good exhaust flaps and you should be ok.

 

[Devilman]

I gotcha... When mine still had the exhaust tips in the transom, they were mostly under water at rest. So without the snails, if water made it past the flappers, it would be damn near a direct line thru the logs into the engine. So probably for peace of mind be better to run them & not have to worry about it?

Ya Shannon, that pic is of a v-drive. That guy is selling those logs, not sure he is including those elbows though. Thats not the style of exhaust I particularly been looking for, but the if it was all included it would not be a bad deal. May hit him up on that.

Make sure you got some good exhaust flaps and you should be ok.

Cool!

 

[KONA77]

Devilman if you pay close attention,  the pic you posted the engine is setting high in the boat,  so his settup is some what different that your typical step up using logs and snails

 

[Last Mohecian]

I have only seen those on V-Drives.  Remember on a V-drive the motor is tilted the opposite way.  The end of the motor closest to the transom is higher.  On a jet the end close to the transom is lower.

 

[SimplyOrange]

Devilman if you pay close attention,  the pic you posted the engine is setting high in the boat,  so his settup is some what different that your typical step up using logs and snails

^ this, flapper are not water tight, if you run them on a boat where the exhaust ports are anywhere near water level you will have a big cuibic inch anchor.

 

[ChryslerJet]

Devilman if you pay close attention,  the pic you posted the engine is setting high in the boat,  so his settup is some what different that your typical step up using logs and snails

^ this, flapper are not water tight, if you run them on a boat where the exhaust ports are anywhere near water level you will have a big cuibic inch anchor.

X2 I was going to say it earlier but since I seem to be the least experienced.  Besides if you have a flapper come off or rip off the snails are still there protecting you.  The flapper is mainly there to prevent pressured backflow when you stop or are in reverse they dont do much for seeping when stopped and sitting in the water with the motor off.

 

[Devilman]

Thanks fellas, all good info.

Those are not the style of logs I am wanting anyway, so I will get the ones I want witha set of  snails on them & call it good. That and a set of tips with some good flaps in them & should be good to go.

 

[soldier of fortune]

i believe my buddy in huffman has a couple sets of bbf logs and snails here is his number  713-855-5559 keith

 

[Red Horse]

I have snails and if I didnt I would have water in the engine. Add the snails for peace of mind.

 

[blazeracer]

Flappers do their work when you come off plane to keep the water from surging back up the pipe. They are by no means water tight, just surge protectors. Snails keep the water out of your motor when it's sitting in the lake at rest. Jet boat motors sit low in the hull because the crank has to be in line with the pump. The snails put your highest point in the exhaust system above the waterline. You should really have both on the jet motor with thru transom exhaust unless you have center risers like I have. The highest point on my exhaust is way above the waterline, which is 2" higher than the pic because there are O2 sensor spacers sandwiched in there.

BTW, nice engine scoop on the V-drive.

 

[KONA77]

Flappers are over rated,  have not had them in my tips for over a year now,  this monster ford motor just keeps blowing them out so i quit putting them in  :smile27:

 

[SimplyOrange]

if you have a bbc check out the fire sale on PB, you may be able to strike a deal.

 

[Wakemaker]

This  is how my boat came when I bought it, If you remember I once had logs  with thru-transom exhaust.  As you can see in the first picture water  came out of the block into the homemade snails that went down thru the transom.

It  wasn't a problem until I bought the over the transom  snails.  I really  don't remember for sure if I had flappers or not, I  really don't think  that I did.  (Pic 2)

Either way at the extreme angle  to go back up through the logs water coming in was never a problem.  How to fill a fresh motor with water 5 min after firing it up for the first time:  1)  Run water exactly as it was when you had thru-transom exhaust!  (By the  way there are no seep holes in logs or snails!!!) 2) Run motor  full of  confidence for 5 minutes setting timing and generally feeling  good about  having an new bullet in boat.  3) Pull hot wire from  distributor while  water is flowing heavily from newly configured over  the transom snails.  4) Wait for water that you were somehow able to  push up through the  snails to come running back down in cylinder heads,  so as to fill all  cylinders full completely full of water.

(Video)

http://www.youtube.com/watch?v=u7uHv732GYc&feature=youtu.be


Really  the only way to properly break in a fresh boat motor as far as I  am  concerned is to spend good money on Castrol 20/50 Racing oil, only  to  have to drain it all out after adding a gallon of water to it!  I'm  not  even going to mention the hydro-lock situation that had me convinced  that my starter went bad over the winter, and had me searching 10 auto  parts stores to find another starter. (Idiot[/] at all parts stores)..."What did the starter come off of?"  (Me) "A boat. It's a 350 Chevy starter, how difficult could it be to match it up?" 
   
 

What  is it exactly that the snails do on log exhaust? Serve as sort of a  P  trap (for lack of a better description) to keep water from gettin  into  the engine.... muffling engine noise... ?

It does have water lines going to them, to cool the flexible hose I assume?

Just curious if this setup is something I could run & what would be the reason for this over the other.

Thanks!

I'm  sure that the water lines are just going to the snails for no other  reason than to discharge water from the block, not for cooling or any  other reason.  As long as the water coming out of the logs is going  downhill there is no reason to have to have another water outlet coming  out of the back of the boat.  After going uphill I had to add the ugly  hose going over the back of the boat to get the majority of the water  cycling through to exit.  (Pic 3)

My .02

Devilman just started a thread to see whatever happened to Wakemaker, surely he can't lay off this one!  think.gif

 

[Kachina dad]

We just found out recently that the Kachina, with the 460 ford, will  die out at idle, if the flappers are gone. It will suck water back through the snails, without the flappers.

 

[duanehydro]

Here ya go Kenny....easy and priced right if no one else bids. PLus they flow/run good. :smile30:
http://www.ebay.com/itm/Jet-Boat-Drag-Boat-Berkeley-Race-Offshore-BBF-Header-Type-Exhaust-Manifolds-/160831299706?hash=item25724ae07a&item=160831299706&pt=Boat_Parts_Accessories_Gear&vxp=mtr

 

[Devilman]

Here ya go Kenny....easy and priced right if no one else bids. PLus they flow/run good. :smile30:
http://www.ebay.com/itm/Jet-Boat-Drag-Boat-Berkeley-Race-Offshore-BBF-Header-Type-Exhaust-Manifolds-/160831299706?hash=item25724ae07a&item=160831299706&pt=Boat_Parts_Accessories_Gear&vxp=mtr

They look awful close to the factory style valve covers in that pic. Mine hang out there a bit farther, that would suck if they didn't clear. Good lookin set of manifolds though. There is a set of those on PB as well, guy also has a set of the Harman logs/snails like I was lookin for.

what to do, what to do... :lipsrsealed: (besides sell some shitt to bring in a little extra coin, lol)

 

[Devilman]

My .02

Devilman just started a thread to see whatever happened to Wakemaker, surely he can't lay off this one!  think.gif

Damn Clayton, that sux. I've had some projects that went that way before.  Good thing is you got it all under control now. :wink: