Reply
 
Thread Tools Search this Thread
 
Old 22 March 2011, 06:04   #11
RIBnet supporter
 
nugent's Avatar
 
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,385
Quote:
Originally Posted by biffer View Post
want more power, to go faster, BUY A BIGGER ENGINE
only cos i got it in bits = an xr6 sitting there with other bits

staying std now
__________________

MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
nugent is offline   Reply With Quote
Old 22 March 2011, 18:06   #12
RIBnet supporter
 
gotchiguy's Avatar
 
Country: UK - England
Town: Dinard, Brittany
Boat name: Into the Red
Make: Osprey Vipermax
Length: 7m +
Engine: Evinrude E-tec 250HO
MMSI: 235 076 114
Join Date: Apr 2009
Posts: 1,948
RIBase
Quote:
Originally Posted by Nos4r2 View Post
Yes, I do disagree with that. Apart from anything else,the phrase 'performance engine' is a misnomer,your statement is showing no constants and 'lean of peak' means absolutely nothing. Lean what? Peak what? Cooler than what? Trousers? Hair growth rate? Hot air output?

If You hadn't noticed, this thread is to do with one specific outboard.If you're not referring to an outboard then your post is irrelevant to the discussion anyway.
Quote:
Originally Posted by Cookee View Post
Complete Tosh!
For anyone remotely interested, I have replied to these two posts in the bilges section here in order to save Nos the trouble.
__________________
gotchiguy is offline   Reply With Quote
Old 23 March 2011, 03:03   #13
Member
 
Leapy's Avatar
 
Country: UK - England
Town: Sheepy Parva
Boat name: Sadly Sold
Length: no boat
Join Date: Sep 2008
Posts: 1,728
Quote:
Originally Posted by gotchiguy View Post
For anyone remotely interested...
After 32 years in related industry, I thought I might be. Turns out I'm not
__________________
Leapy is offline   Reply With Quote
Old 23 March 2011, 03:50   #14
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by gotchiguy View Post
For anyone remotely interested, I have replied to these two posts in the bilges section here in order to save Nos the trouble.
Thanks for the explanation that you weren't talking about boats but aero engines - Think about this - Just imagine someone believes that reading this helpful information on a boating forum believes it and blows their motor up? I'm not saying they would, but irrelevant and misleading information can do a lot more harm than good.
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 23 March 2011, 08:24   #15
RIBnet supporter
 
nugent's Avatar
 
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,385
tee hee i only wanted advice

dare i ask aquestion about flexithane paint
__________________

MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
nugent is offline   Reply With Quote
Old 23 March 2011, 12:58   #16
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
Quote:
Originally Posted by nugent View Post
tee hee i only wanted advice

dare i ask aquestion about flexithane paint
Do you definitely mean flexithane paint, Nugent, and not flexiplane?

I only ask to avoid confusion - I would hate to see you trying to apply the first with a long roller while on the plane instead of employing doublejointed Wingwalkers with Aerosols (the correct technique for flexiPlane)

__________________
willk is offline   Reply With Quote
Old 24 March 2011, 02:49   #17
RIBnet supporter
 
nugent's Avatar
 
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,385
Quote:
Originally Posted by willk View Post
Do you definitely mean flexithane paint, Nugent, and not flexiplane?

I only ask to avoid confusion - I would hate to see you trying to apply the first with a long roller while on the plane instead of employing doublejointed Wingwalkers with Aerosols (the correct technique for flexiPlane)

wing walking with a life jacket would disturb the ride surely not, also the paint spill will end up at the tail end for sure!!
__________________

MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
nugent is offline   Reply With Quote
Old 24 March 2011, 17:05   #18
Member
 
Country: UK - Wales
Town: west wales
Make: humber destroyer 5m
Length: 5m +
Engine: 90 yamaha
Join Date: Apr 2010
Posts: 202
Increasing the volumetric efficiency (porting etc) without proportionally increasing the amount of fuel going in will lead to a lean mixture which will potentially melt a hole in one or more pistons, probably the top one/s (because they are furthest from the nice cool water)
a dyno set up would be the answer.
Or in the old days a full throttle run ,cut the engine at full throttle and pull the plugs out and then increase the size of the main jets until the plugs come out the right colour ,known as a ''plug chop''
This is based on a knowledge of petrol engines generally,no matter what the engine is in, I believe that a lean mixture will make the combustion chamber run hot (not necessarily the engine run hot) and if you're lucky melt the plug and if you're not the piston crown.
But I am happy to be corrected.
__________________
bosun is offline   Reply With Quote
Old 24 March 2011, 19:28   #19
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Here's a reasonable way of getting a rejetting into the right ball court without melting the pistons.

A 2 stroke engine will 4 stroke when its mixture is too rich. So start testing with main jets which are rich enough to just bring on 4 stroking under load. Reduce the jet size to get the engine just 2 stroking and then a good starting point will be one jet size smaller than that.
__________________

__________________
JW.
jwalker 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 23:59.


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