300/440/550 Best 550 pipe

[the WaTeRhAwK]

If I were to slap the Westcoast on how many rings would you say to cut off? Thanks

you want to make it the same length as a shorty stainless. that's probably 5 of 'em off. I'd have to set the two side by side to give you an exact number, but 5 looks like it would do the trick. we stayed away from aluminum chambers because stainless just resonates better and they're easier to tune when you're messing around with water flow, carb jetting, etc... regular BN 44's with the three needle valves have always been my favorite carb on 550's. if you go with dual 38's use SBN's because they're easier to keep sync'd.

 

[x2ryder]

I was gonna run a 44 Blackjack. Also the lowest pitch prop I see is a 14.5 Skat. Even if Impros repitched it it would stil only be a 13.5.

 

[the WaTeRhAwK]

I was gonna run a 44 Blackjack. Also the lowest pitch prop I see is a 14.5 Skat. Even if Impros repitched it it would stil only be a 13.5.

13.5 should be fine. you just want a low enough pitch that will let the engine wind up good before the prop completely loads the pump and tries to pull the engine down. the best grates I've used is the split vein mariner top loaders, too.

 

[x2ryder]

I just got a Shred Master with the skegs in it.

 

[x2ryder]

Is this a Kerker shorty?

 

[the WaTeRhAwK]

Is this a Kerker shorty?

yeppers...

if I were you I wouldn't sell your pipes. if you decide to do modifications to the cylinder later on, as someone else mentioned earlier you will want some different sized chambers for different things. just a thought.

 

[the WaTeRhAwK]

I run the same pipe on my 550 and i think that it has pretty good bottom and top end.

there's no such thing as those two combined. you will either have one or the other. when a setup "seems" to have both of those, a ski that is set up specifically for one or the other will make it eat roost, either out of the hole, or at top speed.

 

[Maxumflux]

so waterhawk, THE muffler proffesional, whats the purpose of a half pipe if you can get better performance out of a shorty?

 

[the WaTeRhAwK]

so waterhawk, THE muffler proffesional, whats the purpose of a half pipe if you can get better performance out of a shorty?

I am by no means a "muffler professional", however, most of my conclusions are from experience in building these things for quite a number of years.

the half-pipe chamber on a stock setup is for good, even, overall performance throughout the powerband. that doesn't mean you will get the low-end performance you're looking for with it, and/or top end performance. it all basically boils down to how the engine is set up. a pipe will extract specific types of power out of an engine only IF the engine itself is capable of producing it. you can use a particular pipe to enhance various areas of the powerband, but most of that particularly desired performance is going to mainly exist contingent apon the engines limited capeablities itself.

yes, you take a 550 cylinder and hop it to the moon, high compression, raised port timing, ported for low end, stroked crank, etc... and put a half-pipe to it, and yeah, you will have a monster capeable of swinging a high pitched prop all through the powerband....

...it's not the case with a stock engine.

if you want a stock motor to perform, you're going to have to cut some strings loose from holding it back. that means you're going to have to lower the pitch of the prop to a level that will allow the engine to spool up good BEFORE the pump loads up and begins putting strain on the motors' ability to make power. in other words, get to an area in the powerband where the powerband is less effected by the pump loading up. also, you're going to have to use a pipe that will bring the rpms higher than they will get with a longer chamber, and that is a "shorty". once you get all that setup you can "fine tune" it with water flow.

the reason it's not as much of an issue with the bigger engines is because they make more power on their own to over come power-to-weight ratios, pumploads, etc...


the more power an engine can make, the less you have to compromise in various areas of the setup.

 

[Maxumflux]

I am by no means a "muffler professional", however, most of my conclusions are from experience in building these things for quite a number of years.

the half-pipe chamber on a stock setup is for good, even, overall performance throughout the powerband. that doesn't mean you will get the low-end performance you're looking for with it, and/or top end performance. it all basically boils down to how the engine is set up. a pipe will extract specific types of power out of an engine only IF the engine itself is capable of producing it. you can use a particular pipe to enhance various areas of the powerband, but most of that particularly desired performance is going to mainly exist contingent apon the engines limited capeablities itself.

yes, you take a 550 cylinder and hop it to the moon, high compression, raised port timing, ported for low end, stroked crank, etc... and put a half-pipe to it, and yeah, you will have a monster capeable of swinging a high pitched prop all through the powerband....

...it's not the case with a stock engine.

if you want a stock motor to perform, you're going to have to cut some strings loose from holding it back. that means you're going to have to lower the pitch of the prop to a level that will allow the engine to spool up good BEFORE the pump loads up and begins putting strain on the motors' ability to make power. in other words, get to an area in the powerband where the powerband is less effected by the pump loading up. also, you're going to have to use a pipe that will bring the rpms higher than they will get with a longer chamber, and that is a "shorty". once you get all that setup you can "fine tune" it with water flow.

the reason it's not as much of an issue with the bigger engines is because they make more power on their own to over come power-to-weight ratios, pumploads, etc...


the more power an engine can make, the less you have to compromise in various areas of the setup.

thanks, very helpful... sorry if i'm thread jacking but i have a 44mm carb with a cut head 35000's of an inch ( havn't compression checked it yet) and a shorty pipe with a longer ride plate. what pitch prop is ideal for this?

 

[the WaTeRhAwK]

thanks, very helpful... sorry if i'm thread jacking but i have a 44mm carb with a cut head 35000's of an inch ( havn't compression checked it yet) and a shorty pipe with a longer ride plate. what pitch prop is ideal for this?

I use basically the same setup with a 13 straight pitch skat in a blueprinted and ported 440 pump. it violently rips away from a stop and tops out around 42-45 depending on water condition. that's with the heavy stock flywheel too.
you can tweak that a little with a bit of timing advance, lightened flywheel, etc.. I'm going to take off the stocker and electrics and install the msd TL system on it, that will make it even more of a monster out of the hole. you have to be ready for them when they're set up like this, if you're not used to it or expecting it, from a dead stop they will jerk away from you leaving your wrists sore if you're not braced and ready to hang on.

 

[Littlecake77]

best is full PJS :Banane01:

 

[the WaTeRhAwK]

best is full PJS :Banane01:

not for a stock piston port 550 cylinder.