Repowered 28 TE with Cummins

blindsquirrel · Post by **blindsquirrel** » Mon Oct 05, 2020 5:47 pm

All,
Repowered with Cummins RECON 6BTA 5.9 370 and have two areas of concern:
1) I feel the boat may be under propped as it reaches 15 knots at 2,400 rpms and was expecting closer to 19
- the new prop was a "ACME high DAR 19 x 20 3B .075 cup Nibral"
- any suggestions for replacement?
2) The transmission ZF 63 IV runs at 340 psi until I get past 2,500 rpms and then it drifts toward 400
- the ZF manual calls for between 312-341 psi
- any ideas what could cause this?
Thanks in advance,
Mike (Blind Squirrel)

Post by **efishnsea** » Mon Oct 05, 2020 7:38 pm

What was your max RPMs? My boat runs a 19x18.

Post by **Sisu22** » Mon Oct 05, 2020 7:54 pm

efishnsea wrote: ↑Mon Oct 05, 2020 7:38 pm What was your max RPMs? My boat runs a 19x18.

Seconded... my Cummins 250 HP pushes to 15 knots at 2,400 rpm depending on weight.

Post by **Nancy** » Mon Oct 05, 2020 10:00 pm

We hit a solid 20 knots at 2400 in fresh water. Prop is 18x19 with #5 cup.

blindsquirrel · Post by **blindsquirrel** » Mon Oct 05, 2020 11:03 pm

I think I hit 3,000 but not real comfortable at that level due to transmission pressure that heads toward 400 psi at 2,600+

Post by **Sisu22** » Sat Oct 24, 2020 5:02 pm

Nancy wrote: ↑Mon Oct 05, 2020 10:00 pm We hit a solid 20 knots at 2400 in fresh water. Prop is 18x19 with #5 cup.

Hi Nancy, what gear are you running? Interested to know because I'm running an 18x23 LH Dyna-Quad. There is also "05-00" which I assumed was date code, but maybe is the cup??

Gear is Italian ZF/IRM 220V 1.527/1

Post by **Sisu22** » Sat Oct 24, 2020 5:03 pm

Also, three or 4 blade?

Post by **Nancy** » Sat Oct 24, 2020 7:24 pm

Um, duh, gear = transmission? We have Hurth HSW800V. Prop is 4-blade.

Post by **Sisu22** » Tue Oct 27, 2020 12:56 pm

Right - Gear = trans.

Do you know the gear ratio? Interesting that they put a Hurth in some and ZF on the same engine only a year earlier...

Post by **RobS** » Tue Oct 27, 2020 2:22 pm

Sisu22 wrote: ↑Tue Oct 27, 2020 12:56 pm Right - Gear = trans.

Do you know the gear ratio? Interesting that they put a Hurth in some and ZF on the same engine only a year earlier...

Well that makes total sense as ZF bought Hurth and it was mid 90's or so....

Post by **Nancy** » Tue Oct 27, 2020 7:44 pm

I don't know the gear ratio and don't know where to find it.

blindsquirrel · Post by **blindsquirrel** » Tue Oct 27, 2020 11:19 pm

Anyone with a similar set up:
Engine: Cummins 6BTA 5.9 370
Transmission: ZF 63 IV
Shaft: 1.5”
able to recommend a prop that works well for them?
Thanks!

Post by **Sisu22** » Wed Oct 28, 2020 5:56 pm

blindsquirrel wrote: ↑Tue Oct 27, 2020 11:19 pm Anyone with a similar set up:
Engine: Cummins 6BTA 5.9 370
Transmission: ZF 63 IV
Shaft: 1.5”
able to recommend a prop that works well for them?
Thanks!

You will for sure need to know the gear ratio on the ZF as this will make a huge difference. Who did the install?

Post by **Sisu22** » Wed Oct 28, 2020 5:56 pm

Nancy wrote: ↑Tue Oct 27, 2020 7:44 pm I don't know the gear ratio and don't know where to find it.

Usually stamped on the ID plate of the transmission, wherever the serial number is as well.

blindsquirrel · Post by **blindsquirrel** » Mon Nov 16, 2020 1:30 pm

Install was Seaboard. Gear Ratio is 1.56/1.57. Noticed that most Albin 28TE's run 4 blade prop.

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Repowered 28 TE with Cummins

Repowered 28 TE with Cummins

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