Halmatic 880 ,,,,,,remember them ?

[lynnx22]

Hi All,
Can anyone tell me what the exhaust system looked like/consisted of ?
I,m saving one from scrap.

Be silent you in doubters row !

 

[Tranona]

Welcome.

Perkins 4 107? If so probably a stainless steel fabricated water trap.

However of re doing suggest you use the modern method of Vetus type waterlock and flexible hose.

 

[Refueler]

Or the other 4-107 system ..... no water lock or silencer ... common on many 70's installs such as mine.

The exhaust being a plain exhaust pipe set lower than manifold that exits transom. The quietening coming from the water exiting same pipe 'absorbing' the sound.
Pipe being lower - to avoid water invading manifold ....

Its not as loud as some may imagine.

 

[lynnx22]

Hi,

Yes - a 4107 which is rebuilt and awaiting installation.
It turns out that the water injection outlet into exhaust is at w/l, as is the exhaust outlet thru hull.
As bought, the exhaust hose was connected straight to the outlet.
No water lock, no lift muffler, no anti-syphon and therefore always full of water.
There is no evidence of anything being fitted and very limited space.

I doubt it was built like that , hence the question as to others who have seen one.

I have looked at the vetus horizontal waterlock but it would only fit some 6" above the lowest point of the exhaust, and only 3 " of it would be above the w/l.
More research!
Any one got some original plans?

 

[Refueler]

My setup is basically only an inch or so above W/L .... when stationary. But once motoring - that soon becomes outlet lower than W/L and pipe angled down from engine. The exhaust 'blow' is more than enough to clear the pipe.

I have never had water back up to engine .... and I have my inlet full open giving serious volume through it.

I know there will be some who would argue against what I post now .... BUT - I would strongly suggest that you do not introduce any item into the exhaust run that could in any form cause a back-up of water to the manifold.
When I replaced my 4-99 with the 4-107 ... using the same original exhaust - I suggested to engineer that maybe we could add a waterlock or silencer ... he strongly advised against it - in his words - the engine exhaust has enough power to 'blow' out the water, but add anything and that ability plus the 'elevation' may cause back-up of water.
My setup is near similar as yours .... it was installed in early 70's and still working fine.

 

[Tranona]

Hi,

Yes - a 4107 which is rebuilt and awaiting installation.
It turns out that the water injection outlet into exhaust is at w/l, as is the exhaust outlet thru hull.
As bought, the exhaust hose was connected straight to the outlet.
No water lock, no lift muffler, no anti-syphon and therefore always full of water.
There is no evidence of anything being fitted and very limited space.

I doubt it was built like that , hence the question as to others who have seen one.

I have looked at the vetus horizontal waterlock but it would only fit some 6" above the lowest point of the exhaust, and only 3 " of it would be above the w/l.
More research!
Any one got some original plans?

Does not matter if the waterlock is partly above the waterline - its purpose is to collect the water that is in the hose when the engine stops. what you seem to be missing is a loop (swan neck) above the waterline just before the outlet. You do, however need a reasonable fall (30cm) from the water injection point to the inlet of the waterlock. An antisyphon valve somewhere between the outlet from the sea water pump and the exhaust injection point would be good. Does not matter if it is before or after the heat exchanger so long as ot is well above the waterline..

 

[lynnx22]

My setup is basically only an inch or so above W/L .... when stationary. But once motoring - that soon becomes outlet lower than W/L and pipe angled down from engine. The exhaust 'blow' is more than enough to clear the pipe.

I have never had water back up to engine .... and I have my inlet full open giving serious volume through it.

I know there will be some who would argue against what I post now .... BUT - I would strongly suggest that you do not introduce any item into the exhaust run that could in any form cause a back-up of water to the manifold.
When I replaced my 4-99 with the 4-107 ... using the same original exhaust - I suggested to engineer that maybe we could add a waterlock or silencer ... he strongly advised against it - in his words - the engine exhaust has enough power to 'blow' out the water, but add anything and that ability plus the 'elevation' may cause back-up of water.
My setup is near similar as yours .... it was installed in early 70's and still working fine.

My setup is basically only an inch or so above W/L .... when stationary. But once motoring - that soon becomes outlet lower than W/L and pipe angled down from engine. The exhaust 'blow' is more than enough to clear the pipe.

I have never had water back up to engine .... and I have my inlet full open giving serious volume through it.

I know there will be some who would argue against what I post now .... BUT - I would strongly suggest that you do not introduce any item into the exhaust run that could in any form cause a back-up of water to the manifold.
When I replaced my 4-99 with the 4-107 ... using the same original exhaust - I suggested to engineer that maybe we could add a waterlock or silencer ... he strongly advised against it - in his words - the engine exhaust has enough power to 'blow' out the water, but add anything and that ability plus the 'elevation' may cause back-up of water.
My setup is near similar as yours .... it was installed in early 70's and still working fine.

Does it always requote the message or am I missing a button somewhere ?

How much of your exhaust is below the w/l ?About a 1/3 of mine would be ( 0.7m)
I accept that under power little water from outside would get in and most cooling water would get blown out.
However, under sail the whole system would be full of water and any pitching would raise that water above manifold level.

When I stripped the engine nos3 and 4 ex valves had corroded to stumps and the head had holes.............

See why I,m ... concerned ?

 

[lynnx22]

Does not matter if the waterlock is partly above the waterline - its purpose is to collect the water that is in the hose when the engine stops. what you seem to be missing is a loop (swan neck) above the waterline just before the outlet. You do, however need a reasonable fall (30cm) from the water injection point to the inlet of the waterlock. An antisyphon valve somewhere between the outlet from the sea water pump and the exhaust injection point would be good. Does not matter if it is before or after the heat exchanger so long as ot is well above the waterline..

The injection port is about 4" above w/l and that is hopefully enough to prevent syphoning.
I agree that a swan neck would prevent surging back up the exhaust - but would also increase the amount of water the system could hold, perhaps retaining enough to reach the engine manifold.
I cant get ANY fall for a waterlock and most of the system is below the thru- hull anyway, so I think it would just up from out side.
I am researching lift mufflers !

 

[Refueler]

Does it always requote the message or am I missing a button somewhere ?

How much of your exhaust is below the w/l ?About a 1/3 of mine would be ( 0.7m)
I accept that under power little water from outside would get in and most cooling water would get blown out.
However, under sail the whole system would be full of water and any pitching would raise that water above manifold level.

When I stripped the engine nos3 and 4 ex valves had corroded to stumps and the head had holes.............

See why I,m ... concerned ?

Understand fully .....

My exhaust pipe is a straight pipe with a slight incline down to the transom ... just a couple or more degrees.

Friends of mine when I was in UK had Halmatic 8.80 with Perkins ..... that had no silencer / waterlock .... basically same as mine.

If I was you - I would be finding the local Marine Diesel guy and have a discussion about possible solutions .....

 

[lynnx22]

So......after some research.
I SHOULD have a dry riser from manifold to a min of 12 " above w/l then straight decline to w/l exhaust outlet, with cooling water injected more than.3" down on the downhill slope.
AND a syphon break at that point too.
I would then not need a water lock, anti surge or water lift.
Simples.
Except it,s not. Of course.
There is no height in engine bay, so riser would need to go 3' pt or stbd and up in to cockpit lockers ( fuel tank one side and quarter berth the other)
Not to mention the 3' torque arm and vibration from ancient Perkie!
I guess I,m over thinking it and I,ll just have to shut the exhaust gate valve every time I stop the engine !