Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 12-08-2006, 10:58 PM   #1
Dave
 
Ring Owner's Avatar
 
Country: UK
Location: Scotland
Occupation: Offshore Seismic Surveyor
Interests: Boats of any shape or size
Boat name: Miss-T
Boat make: Ring 21B
Engines: 200 XR2
Cruising area: Loch Earn

Join Date: Feb 2006
Location: Scotland
Posts: 239
Merc XR2 Specs

During one of my previous threads regarding props for my Black Max XR2, Matt mentioned that he thought the RPM for this engine should be 6000 not 5500 as I had been lead to believe.

Had a look around the web but cant find any useful info to back this up.

Does anyone out there have a copy of the specs for these engines or at least let me know where to start looking? I believe these were around in the mid to late 80's.

Dont really want to start over rev'ing the engine unnecessarily!!
__________________

Ring Owner is offline   Reply With Quote
Old 12-08-2006, 11:17 PM   #2
Registered User
 
cfun's Avatar
 
Country: uk
Location: poole
Occupation: retail
Interests: sport and being lazy
Boat make: ring rib
Engines: merc xr2
Cruising area: bournemouth bay

Join Date: Jan 2006
Location: poole
Posts: 1,681
I think I mentioned when you posted before I had an early one it reved happily over 6k it never blew up, after some 3yrs I had it checked over and new rings fitted, and ran it for a further 3yrs no problem, as a mate who used to build them used to say the more you rev it and hold it there the quicker it comes to me, for a pleasure boat if you want it to last prop it for 5800 2up 5500 4/5 up it might last longer that way
__________________

__________________
i can na give her any more captain
cfun is offline   Reply With Quote
Old 12-08-2006, 11:36 PM   #3
jw.
Registered User
 
jw.'s Avatar
 
Location: Scotland
Interests: Hole maker
Boat make: Humber Ocean Offshore
Engines: KAD 300/DPX

Join Date: Mar 2004
Location: Scotland
Posts: 956
I'm not sure whethere this is a help or not, it is taken from the works Merc manual. However, there is no mention of the XR2 just the XR4. There is also a page specifically given over to the XR4 and a graph of the hp against revs. It says that the engine must be proped at or just below the max rpm, which is 5500, and there is a rapid loss of power as revs increase past that maximum.
Attached Thumbnails
Click image for larger version

Name:	merc.jpg
Views:	180
Size:	103.4 KB
ID:	9698  
__________________
JW.
jw. is offline   Reply With Quote
Old 13-08-2006, 12:51 AM   #4
Registered User
 
Burty's Avatar
 
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer

Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
Send a message via AIM to Burty
most V6 merc's should be fine to rev to 6500 as long as you premix
Burty is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 09:14 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×