Two Engines

Jackstee · 19-01-2007, 04:42

Hi all.
Know there's been lots of talk about re-engine changing on our cats.

But just wondered. I presently have a single 9.9 outboard and most people asume I would change to two 9.9 inboards. Why ? that would double my engine power .

I would of thought two 6's or 8's would be more than enough and still more than my present.

???

Best regards

cat man do · 19-01-2007, 05:29

If you currently have Yamie 9.9 it is a high thrust o/b and the 6 & 8 are not.

The Yamie will stop you on your length, almost , and the others will do nothing.

Dave

Tnflakbait · 19-01-2007, 09:37

how much does your boat weigh? Two 6's should be fine if the 9.9 works.

Jackstee · 23-01-2007, 11:54

Tks for responding.
PM is about 3 - 3.5 tones. I just wondered why when replacing one engine (outboard) with two inboards every one seems to double up. using 6's ot 8's reduces the size quite a bit.
Regds

Tnflakbait · 28-01-2007, 09:28

Im not sure but it would be much heavier to add two 9 horse inboards. Go with the small ones. Outboards are much cheaper but diesel is a nice feature. I have a 30 hp outboard on my cat. I wouldn't put inboards in the boat as I feel it is too small. I would go with two 15's if I had to change.

Perhaps someone on the board knows of some very compact inboards that would suit your needs.

cat man do · 28-01-2007, 14:21

Lombardini do a light diesel, not sure how small, Yanmar do a 9 hp

Dave

captjohn360 · 28-01-2007, 14:34

if it were me id be thinkin, if one quit could i fight a strong current ,winds,or a rip....jt

Jackstee · 31-01-2007, 05:39

Update
Just found a new site. Search Torqeedo.
Looks good
Maybe the answer need input. I have mailed them to ask there views and cost for a twin instalation. Quite a good site.
Captjohn. I would do the same as I would if I lost my single 9.9.
Sail.
Best regards

Tnflakbait · 31-01-2007, 09:26

Torqeedo GmbH: Home

They look cool. Check out the battery situation. You may need more range. Perhaps lots of solar power would help.

19-01-2007, 04:42	#1
Jackstee Registered User Join Date: Nov 2006 Location: Presently liveing and working in Pakistan Boat: HT 26. Currently in Mallorca Posts: 97	Two Engines Hi all. Know there's been lots of talk about re-engine changing on our cats. But just wondered. I presently have a single 9.9 outboard and most people asume I would change to two 9.9 inboards. Why ? that would double my engine power . I would of thought two 6's or 8's would be more than enough and still more than my present. ??? Best regards __________________ I'll be onboard soon.

19-01-2007, 05:29	#2
cat man do Registered User Join Date: Aug 2006 Location: Brisbane Australia [until the boats in the piss] Boat: 50ft powercat, light,long and low powered Posts: 1,782 Images: 35	If you currently have Yamie 9.9 it is a high thrust o/b and the 6 & 8 are not. The Yamie will stop you on your length, almost , and the others will do nothing. Dave __________________ "Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth http://www.thecoastalpassage.com/

23-01-2007, 11:54	#4
Jackstee Registered User Join Date: Nov 2006 Location: Presently liveing and working in Pakistan Boat: HT 26. Currently in Mallorca Posts: 97	Tks for responding. PM is about 3 - 3.5 tones. I just wondered why when replacing one engine (outboard) with two inboards every one seems to double up. using 6's ot 8's reduces the size quite a bit. Regds __________________ I'll be onboard soon.

28-01-2007, 14:21	#6
cat man do Registered User Join Date: Aug 2006 Location: Brisbane Australia [until the boats in the piss] Boat: 50ft powercat, light,long and low powered Posts: 1,782 Images: 35	Lombardini do a light diesel, not sure how small, Yanmar do a 9 hp Dave __________________ "Money can't buy you happiness but it can buy you a yacht large enough to pull up right alongside it"...............David Lee Roth http://www.thecoastalpassage.com/

28-01-2007, 14:34	#7
captjohn360 Registered User Join Date: Mar 2004 Location: chicago il Boat: fp athena 38 ..10 10 Posts: 127 Images: 4	if it were me id be thinkin, if one quit could i fight a strong current ,winds,or a rip....jt __________________ captjohn360

19-01-2007, 09:37	#3
Tnflakbait Registered User Join Date: Apr 2006 Location: Southern California Boat: CSK, 33' Aita Pe'ape'a Posts: 309 Images: 6	how much does your boat weigh? Two 6's should be fine if the 9.9 works.

28-01-2007, 09:28	#5
Tnflakbait Registered User Join Date: Apr 2006 Location: Southern California Boat: CSK, 33' Aita Pe'ape'a Posts: 309 Images: 6	Im not sure but it would be much heavier to add two 9 horse inboards. Go with the small ones. Outboards are much cheaper but diesel is a nice feature. I have a 30 hp outboard on my cat. I wouldn't put inboards in the boat as I feel it is too small. I would go with two 15's if I had to change. Perhaps someone on the board knows of some very compact inboards that would suit your needs.

31-01-2007, 05:39	#8
Jackstee Registered User Join Date: Nov 2006 Location: Presently liveing and working in Pakistan Boat: HT 26. Currently in Mallorca Posts: 97	Update Just found a new site. Search Torqeedo. Looks good Maybe the answer need input. I have mailed them to ask there views and cost for a twin instalation. Quite a good site. Captjohn. I would do the same as I would if I lost my single 9.9. Sail. Best regards __________________ I'll be onboard soon.

31-01-2007, 09:26	#9
Tnflakbait Registered User Join Date: Apr 2006 Location: Southern California Boat: CSK, 33' Aita Pe'ape'a Posts: 309 Images: 6	Torqeedo GmbH: Home They look cool. Check out the battery situation. You may need more range. Perhaps lots of solar power would help.

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