Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 22-04-2007, 08:43 PM   #1
Registered User
 
Parahandy's Avatar
 
Country: Scotland
Location: Stirling
Occupation: Company owner
Interests: Having fun
Boat name: Vital Spark - C7
Boat make: Argo Cat
Engines: xr2
Cruising area: Firth of Clyde / Forth

Join Date: Feb 2007
Location: Stirling
Posts: 47
XR2 - Help!

Has anyone got a graph showing the power curve for a stock xr2 (or even a blue printed engines' one for 111c 2 ltr class)
__________________

Parahandy is offline   Reply With Quote
Old 22-04-2007, 11:33 PM   #2
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
I should imagine peak power is up around the 7000rpm mark
__________________

Burty is offline   Reply With Quote
Old 23-04-2007, 07:56 AM   #3
Registered User
 
scottyboy's Avatar
 
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton

Join Date: Jan 2005
Location: West Sussex
Posts: 2,652
The powerband is between 6500-6800rpm on a stock motor. as with most engines it will rev higher past this and sound better but if it was on a dyno the graph/powercurve would fall of anything past 6900 really. (Unless tuned)
__________________
Class 3C Mono EPA National speed record holder 95.35 mph Avg!
scottyboy is offline   Reply With Quote
Old 23-04-2007, 11:59 AM   #4
hello
 

Join Date: Mar 2004
Posts: 2,739
I suspect it wouldn't fall off just level out for a bit then fall off at like 8K.
JamesM is offline   Reply With Quote
Old 23-04-2007, 08:46 PM   #5
Registered User
 
Country: Poland
Location: Warsaw

Join Date: Dec 2005
Location: Warsaw
Posts: 568
So I also have a rev question.

I have 1993 XR2 bone stock, as far as I now never rebuilded.
I don't know how many hours but compression is about 147 all 6 cyl
What is the max rev I can run not to broke it??
I'm finishing rebuilding my boat and hope to ride it in next two weeks
It will be very first time for me on that boat and engine and I don't want to broke something as I don't have any experience with high perf engines

I'v heard that mercury is saying the redline is 6500 rpm........

Thanks for help
Mike_G is offline   Reply With Quote
Old 23-04-2007, 09:44 PM   #6
Registered User
 
DAVE R's Avatar
 
Country: Scotland
Location: EAST KILBRIDE
Boat name: FLYING BANANA
Boat make: RING 20
Engines: 2.5(260)
Cruising area: NORTHUMBERLAND COAST/WEST COAST

Join Date: Apr 2007
Location: EAST KILBRIDE
Posts: 36
buzzin hornet

so you bought it great boat
DAVE R is offline   Reply With Quote
Old 23-04-2007, 10:14 PM   #7
Registered User
 
Parahandy's Avatar
 
Country: Scotland
Location: Stirling
Occupation: Company owner
Interests: Having fun
Boat name: Vital Spark - C7
Boat make: Argo Cat
Engines: xr2
Cruising area: Firth of Clyde / Forth

Join Date: Feb 2007
Location: Stirling
Posts: 47
Thanks for the help guys... that's really confirming what I was thinking
Parahandy is offline   Reply With Quote
Old 24-04-2007, 08:43 AM   #8
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
Quote:
Originally Posted by Mike_G View Post
So I also have a rev question.

I have 1993 XR2 bone stock, as far as I now never rebuilded.
I don't know how many hours but compression is about 147 all 6 cyl
What is the max rev I can run not to broke it??
I'm finishing rebuilding my boat and hope to ride it in next two weeks
It will be very first time for me on that boat and engine and I don't want to broke something as I don't have any experience with high perf engines

I'v heard that mercury is saying the redline is 6500 rpm........

Thanks for help
Just use it as it won't matter if you rev to 700 or 7000rpm because it will go pop if it wants to
Burty is offline   Reply With Quote
Old 25-04-2007, 12:55 AM   #9
Registered User
 
Techteam's Avatar
 
Country: UK
Location: Windermere

Join Date: Oct 2005
Location: Windermere
Posts: 557
Fresh it up with ART pistons and we rev to 8000 rpm I'd like to see you get it past 7000 with any kind of decent sized prop on it.
Techteam is offline   Reply With Quote
Old 25-04-2007, 06:34 PM   #10
Registered User
 
Country: Poland
Location: Warsaw

Join Date: Dec 2005
Location: Warsaw
Posts: 568
Thanks for answers guys

Right now I'm finishing rebuiding the boat and will not have money to do anything with engine
I'm planning to refresh the engine next winter.
So now I will tread this engine calm
I will try not to broke it this summer

Where can I buy good parts for this engine?? Who can rebuild it properly??
I'm just asking if I had any problems in the future because here in Poland mechanics don't know anything about high perf engines. When I was talking with mercury dealer he said that he don't have any info on this engine cause they didn't sell those engines

So who can I trust??

One more thing
What is blue printing??
Mike_G is offline   Reply With Quote
Old 25-04-2007, 08:33 PM   #11
Registered User
 
scottyboy's Avatar
 
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton

Join Date: Jan 2005
Location: West Sussex
Posts: 2,652
Greg at gb watersports has loads of spares for these and can be trusted as alot of people on here use him including me. 01733 322108
__________________

__________________
Class 3C Mono EPA National speed record holder 95.35 mph Avg!
scottyboy 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 05:00 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×