Do HPDIs go wee-wee on the muffs? Well...

[seabob4]

So, in answer to Ben's question about whether Yam HPDIs run on the muffs, have a good pisser, trigger the overheat alarm...

Video 1, 200 HPDI, 2001, starboard...

http://www.youtube.com/watch?v=VoQniCWQ ... ature=plcp

Video 2, 200 HPDI, 2001, port...

http://www.youtube.com/watch?v=4Mgn59e- ... ature=plcp

Ran both for about 1/2 hour, pisser was good, no overheats.  Judge for yourselves...

[Blue Agave]

Ben should go with a new impeller.

[Aswaff400]

bob, i coulda told you that! we have a 36 contender, trip 250 hpdi's, the owner preffers run on muffs over the flush do-hickey, never had an overheat alarm com on for us... and we run 2 engines at a time with a y-valve thing we made for twin-trip-quad powered boats...

[seabob4]

Ben should go with a new impeller.

Agreed.  And it certainly won't hurt.  But his engine should be fine...

[seabob4]

Aaron, when I get a YF here with triple HPDI 300s, I'll give it another try...    

[flounderpounder225]

Allow me to chime in here, first, the HPDI,s seem to like a good water flow, especially the big boys like my 250.  The water flow on muffs is never what I would call impressive, or close to what my OMC,s or Merc,s would do, they would drive a hole in the ground.  However, I only use the flusher that has the two flow tubes going from the garden hose to each side of the foot.  Also, I have had to squeeze the metal bar together once in a while to get it to seal better against the water pick up screens, off too much water was leaking away I had no indicator stream, and always shut it down until I got it flowing.  Even at idle in the water the stream just kind of flows out, like in Bob's video.

[seabob4]

Allow me to chime in here, first, the HPDI,s seem to like a good water flow, especially the big boys like my 250.  The water flow on muffs is never what I would call impressive, or close to what my OMC,s or Merc,s would do, they would drive a hole in the ground.  However, I only use the flusher that has the two flow tubes going from the garden hose to each side of the foot.  Also, I have had to squeeze the metal bar together once in a while to get it to seal better against the water pick up screens, off too much water was leaking away I had no indicator stream, and always shut it down until I got it flowing.  Even at idle in the water the stream just kind of flows out, like in Bob's video.

Know what you mean Marc.  May pick up a set of muffs that splits the flow, feeds both intakes.  But I was happy with the 200s performance, both motors, after running 1/2 hour, I could easily lay my hand on the heads, just felt a bit more than warm...

[John Jones]

Strange experience here.  I have used the "Y" type that feeds both muffs for years.  Worked great on the 225 Ocean Runner, my Yam 60, a friend's Yam F250, and a F115 I used to have.  My son came down with his Mitzi with an older Honda 50 4 stroke and his would not pee with the "Y" muffs.  Switched over to his $6 Wal-Mart muffs and it would pee just fine.  

[seabob4]

Strange experience here.  I have used the "Y" type that feeds both muffs for years.  Worked great on the 225 Ocean Runner, my Yam 60, a friend's Yam F250, and a F115 I used to have.  My son came down with his Mitzi with an older Honda 50 4 stroke and his would not pee with the "Y" muffs.  Switched over to his $6 Wal-Mart muffs and it would pee just fine.  

One of life's mysteries, JJ...

[gran398]

In SC at the reunion..."Duke"...the guy that saved us at 3 PM on a Friday afternoon....ran cut-out 55 gallon plastic barrels.

Notched in the front to slide under any motor on a trailer. Had a bunch of them, ready to go, for any install.

Scenario: Back the boat up to the stall, slide the half-barrel beneath the engine....fill with water. Took a while...

But...guesswork eliminated. Threw her in gear too.

[seabob4]

In SC at the reunion..."Duke"...the guy that saved us at 3 PM on a Friday afternoon....ran cut-out 55 gallon plastic barrels.

Notched in the front to slide under any motor on a trailer. Had a bunch of them, ready to go, for any install.

Scenario: Back the boat up to the stall, slide the half-barrel beneath the engine....fill with water. Took a while...

But...guesswork eliminated. Threw her in gear too.

Scott,
Whenever I run on the muffs, I go in both fwd and rev...afterall, I usually have to de-rig/re-rig, want to make sure all is good to go...

[slvrlng]

The only problem with using the barrels like Duke did is the water gets hot after a while from the exhaust. If you have a overheat problem it can "confuse" the thermostat into staying open all the time.

One good thing about the barrel method is it puts pressure on the exhaust so you get a better idea about how it idles when you dunk it.

[BTF112989]

Well everybody, Seabob inspired me with those videos.  I have my impeller on order now & it should be here in a few days!  I was pretty much convinced I needed a new one anyway after almost 300 hours & everyone's opinions on the matter the other day.  My HPDI is still peeing while running it in the lake, but not pushing that water out hard by any means.  I'm going to run my new battery cables, hook up my dual batteries up tomorrow, take the boat out friday for my dad's birthday, then hopefully get the impeller in by this weekend or early next week.  I may be asking yall some questions about changing a Yamaha impeller out.  I've installed a ton of impellers in all my little motors, but never in one this big.  I don't want to screw anything up(most worried about getting the shift shaft back in place correctly).

Seabob,
Thanks for making those videos to confirm that HPDI's should pee while on the muffs!  

I guess an HPDI, that doesn't shoot water out of the telltale while running on the muffs, is telling you its time to change its impeller.

I bought the dual feed muffs before running my engine the other day as cheap insurance to cool the engine as much as possible.  

I guess each engine make has different running characteristics while running on land/on the muffs.

Thanks for the confirmation,
-Ben

[Aswaff400]

Strange experience here.  I have used the "Y" type that feeds both muffs for years.  Worked great on the 225 Ocean Runner, my Yam 60, a friend's Yam F250, and a F115 I used to have.  My son came down with his Mitzi with an older Honda 50 4 stroke and his would not pee with the "Y" muffs.  Switched over to his $6 Wal-Mart muffs and it would pee just fine.  

One of life's mysteries, JJ...

ive seen that many times, many of our customers buy the expensive dual feed ones, and almost immediately threw them away...

the only 2 style muffs we use are the good ol'fashioned 6 dollar ones and the mercury clamp on ones. the only time we've ever had an overheat alarm when running any engine on muffs was on boats that where not in the best of shape and the owners rarely maintained them.




there was a TSB on the merc flush that because the inlet is at an angle, it its facing the wrong way it could trigger an overheat alarm...

[seabob4]

Aaron,
Do you guys have the one that fits over the nosecone for SSM and Speedmaster LUs?  I've found you have to get those things super tight to the bullet for them to work properly...

Hey, Ben pleasure on the vids, had to run the motors anyway since I de-rigged them both plus added in a new binnacle, had to make sure my cable adjustments were correct.  Besides, it's kinda fun...