Reply
 
Thread Tools Search this Thread
 
Old 18 October 2011, 09:44   #1
Member
 
mister p's Avatar
 
Country: UK - England
Town: LONDON
Make: SR4/ZODIAC/3D
Length: 4m +
Engine: 30T/40T
Join Date: Oct 2011
Posts: 1,433
Derestriction

Is there any reversible restriction on a Mariner 8 hp two stroke?
I suspect there are another few horses lurking in there.
Unless I already have them as it punches above its weight.
__________________

__________________
mister p is offline   Reply With Quote
Old 18 October 2011, 10:03   #2
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Don't take my word for it but I think that's an uprated 6HP.

The 9.9 is upgradeable to 15HP so that kind of leaves nowhere for the 8 to go. I think the models are as follows

2.5/3.3 4/5 6/8 9.9/15 20/25/30 40/50/60 75/90

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________

__________________
Boats&Outboards is offline   Reply With Quote
Old 18 October 2011, 12:00   #3
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
6, 8, 9.9/10, 15 Merc/Mariners are all based on the same motor.
__________________
Downhilldai is offline   Reply With Quote
Old 18 October 2011, 13:11   #4
Member
 
mister p's Avatar
 
Country: UK - England
Town: LONDON
Make: SR4/ZODIAC/3D
Length: 4m +
Engine: 30T/40T
Join Date: Oct 2011
Posts: 1,433
BoatsandOutboards reply appreciated.
Downhilldai, I will push you further on this. So what parts are variable in order to up my power?
__________________
mister p is offline   Reply With Quote
Old 18 October 2011, 13:11   #5
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by Downhilldai
6, 8, 9.9/10, 15 Merc/Mariners are all based on the same motor.
Surely a 6hp cannot be taken upto 15hp though ?

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 18 October 2011, 13:28   #6
Member
 
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
I'm sure you could squeak another HP or so out of a 6/8hp block. You'll probably give up something in the process (no free lunch). If you might want to read this rather dated but valid book, "2 stroke Tuners Handbook" Gordon Jenning's Archivek
__________________
captnjack is offline   Reply With Quote
Old 18 October 2011, 15:06   #7
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by mister p View Post
So what parts are variable in order to up my power?
There was a recent thread on this where we hoped a Merc dealer would give us the answer. May be worth a search on this site. Alternatively, you could take a look at the parts listings on the Merc website to see where the specifications of the 2 motors differ.
__________________
Downhilldai is offline   Reply With Quote
Old 18 October 2011, 15:45   #8
Member
 
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,335
I have just had a look into this. The pistons are different on the 6 and 8hp engines. Also the Cylinder blocks have a different part number from the 9.9 and 15hp.
__________________
Black Dog Marine
www.blackdogmarine.com
Turbodiesel is offline   Reply With Quote
Old 18 October 2011, 15:46   #9
Member
 
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
Quote:
Originally Posted by Turbodiesel
I have just had a look into this. The pistons are different on the 6 and 8hp engines. Also the Cylinder blocks have a different part number from the 9.9 and 15hp.
So would that would suggest the 6/8 are interchangeable as are the 9.9/15 but not a 8/9.9 for example ?

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007
__________________
Boats&Outboards is offline   Reply With Quote
Old 18 October 2011, 16:33   #10
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Sounds like a powerhead swap may be needed.
__________________

__________________
Downhilldai is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 22:51.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.