Public Service Announcement - HRC Water Jackets for TP Motors

[rickwess]

There are two diameter sizes of water jackets made for TP40xx motors. They are easily identified by the colour of the o-rings. The ones with black o-rings are for the newer TP motors that have 39.5mm diameter cans. The ones with red o-rings are for the older TP motors that have 40mm diameter cans.

I stumbled across this because the 4050 and 4060 water jackets I recently purchased came with different coloured o-rings. The fit between the red o-rings and my 39.5mm TP4060 seemed OK but since everything here is frozen solid, I haven't been able to water test.

I'm having Dave @ HRC do up a flat hull mount with rear support for me, so I asked him about the 2 colours of o-rings. Here's his response:

As for the jackets, I did a pressure test on the one with the red o-rings (old version) and got seepage at 8 PSI and drips at 25 PSI. I want no seepage or drips at 40 PSI on all my jackets. The new version for the TP motors cans are about .020 smaller than the older version. Hence the one with the black O rings.

It looks like Steve, and others, have a mixed inventory of these cooling jackets so be sure to know which size can you have and what colour of o-rings the water jacket has.

[flraptor07]

What do you think the normal running preasure is on one of these boats? I'd be surprised if it was over 10psi.

[rickwess]

Good question. I have no idea. I have to assume Dave test to 45psi for a reason. Perhaps he over-engineers stuff like I do.

[tlandauer]

Thanks Rick!
Is it safe to assume all TP cans sold here are of the new dimension now?
On a side note, I "pressure" test my cooling loop with a plastic syringe and I use my finger to block the outlet once the water starts to come out, I typically disconnect the water line at the rudder and insert the nipple of the syringe. I find that if pressurized enough ( water will push my finger away from the outlet! ) chances are that I don't ever need to worry about seepage/leakage.

[rickwess]

Thanks Rick!
Is it safe to assume all TP cans sold here are of the new dimension now?

I don't know, but based on the dimensions listed, they might be the old cans. The 4060 I have is 83mm long and the OSE site lists them at 90mm. Steve didn't have the 4060 motor I needed so I needed to order direct from TP. It wasn't in stock at the time so it was built after I ordered it.

I purchased both 4060 and 4050 water jackets from Steve though. The 4060 had the red o-rings and the 4050 had the black o-rings. Steve now knows the differences, but it wouldn't hurt to ask that the jacket be matched to the can. I didn't know enough to ask.

[Southwest]

Oops sorry?

[rickwess]

I don't have a leak using the PSI my lungs can generate. Unfortunately that's probably limited to 2psi. I'll hook my compressor up later as run a few different psi's through it to see what's what.

The point of this thread was simply to provide the info that there are two different sized water jackets and how to identify them.

[tlandauer]

I don't have a leak using the PSI my lungs can generate. Unfortunately that's probably limited to 2psi. I'll hook my compressor up later as run a few different psi's through it to see what's what.

The point of this thread was simply to prove the info that there are two different sized water jackets and how to identify them.

Rick, I am sorry for yanking it. Thank you for the info!

[rickwess]

No worries.

I would be interested to find out what psi levels our cooling systems see. Obviously it will be based upon speed, but a rule of thumb would be nice to know.

[flraptor07]

No worries.

I would be interested to find out what psi levels out cooling systems see. Obviously it will be based upon speed, but a rue of thumb would be nice to know.

Me too, I think I have a low preasure liquid guage with a tattle tail on it , I'll have to see if I can dig it up.

[HRC]

Thank for posting this Rick. I should have done it a while back. My bad.

My experience for PSI differs with the speed of the boat and the water pickup. At 45-55 MPH you can expect an average of a 12-15 PSI system. The faster the boat the higher the pressure.
Dave

[flraptor07]

Thank for posting this Rick. I should have done it a while back. My bad.

My experience for PSI differs with the speed of the boat and the water pickup. At 45-55 MPH you can expect an average of a 12-15 PSI system. The faster the boat the higher the pressure.
Dave

Thank you sir, that's what I was talking about, I'm surprised it's that high. I would have guessed 5-8 p.s.i.

[smileday]

Well, to clarify this issue, all the TP 40 series motors now selling in the market are using 39.5mm new can. The diameter size change is to fit for the 90mm EDF fan unit we develop for the airplane market.

Almost all the water cooling jackets now come with "black orings", which fit for the new can. Some of them have two "black" orings, and two "red" orings.

[rickwess]

Almost all the water cooling jackets now come with "black orings", which fit for the new can. Some of them have two "black" orings, and two "red" orings.

The key word being "almost". I speak from experience that a Dec 14th order was shipped with red o-rings.

As stated previously, make sure to ask when an order is placed.

[smileday]

That's true. Some of our dealers may have stocked some cooling jackets for the orld-version can long time ago. It is safe to ask them before purchase.
One thing I can be sure is that all the motor cans, including the ones sold on OSE, are the new-version can, and the TP 4060 should be 83 mm. Maybe Steve haven't updated this information.