Go Back  Offshoreonly.com > Technical > General Q & A
flywheel question >

flywheel question

Notices

flywheel question

Old 05-14-2002, 04:10 PM
  #1  
Registered
Thread Starter
 
mxz800's Avatar
 
Join Date: Jul 2001
Location: Pasadena Md
Posts: 802
Likes: 0
Received 0 Likes on 0 Posts
Lightbulb flywheel question

the way i have been told boats use a flywheel as in the type used for a manual trans car. what would happen if you used a lightwieght aluminum flywhel or a SFI approved flexplate as with an automatic. i know there is a thickness issue whick is no biggie, but sems if you could knock off that much rotating mass if would free up alot of horsepower. just a thought.
mxz800 is offline  
Old 05-14-2002, 04:35 PM
  #2  
Registered
 
jdnca1's Avatar
 
Join Date: Feb 2002
Location: KY
Posts: 1,099
Likes: 0
Received 0 Likes on 0 Posts
Default

I run an aluminum flywheel on a 632 Merlin. I'm not sure how much power you gain from going with aluminum, but I do know this "big inch" motor will rev like a Honda.
jdnca1 is offline  
Old 05-14-2002, 06:50 PM
  #3  
Charter Member
Charter Member
 
Join Date: Mar 2001
Location: Longview, Wa 98632
Posts: 133
Likes: 0
Received 0 Likes on 0 Posts
Default

MXZ< it is my opinion and belief that you won't gain HP because once it is turning the weight is a non issue. I have a heavy flywheel instead of a light one which was on the boat in the begining because the weight helps in shifting the OD from neutral
into gear with out stalling. I have a lot of canshaft so it lopes heavy, with the heavy flywheel it smooths it out some. Hope this helps some. GEO
Geo 100 is offline  
Old 05-14-2002, 08:01 PM
  #4  
Blueman
Guest
 
Posts: n/a
Default

I would think with a lightweight flywheel it would over rev quick when you exit the water and upon re-enty it would bog down do to light mass of flywheel.
Just a guess
 
Old 05-15-2002, 05:47 PM
  #5  
Registered
Thread Starter
 
mxz800's Avatar
 
Join Date: Jul 2001
Location: Pasadena Md
Posts: 802
Likes: 0
Received 0 Likes on 0 Posts
Default

these are somethings i didnt consider but should. was hoping someone had already tried this swap (ie. guinea pig ) and could tell me the pros and cons of it thanks for the info. any other thoughts. jdnca1 do you have problems with motor shifting? i realize you have a touch more horsepower than my 7.4 efi mag does.
mxz800 is offline  
Old 05-16-2002, 11:02 AM
  #6  
MKast
Guest
 
Posts: n/a
Default

In years past, the rule of thumb on flywheels was -light weight vehicle alumimun flywheel; heavy weight vehicle, heavy wheel. The wheel stores kinetic energy, if the boat is light no problem with the aluminum wheel. Engine will rev faster, but when a load (like boat reentering the water) is on the engine, rpm will drop like a rock.
 
Old 05-16-2002, 12:34 PM
  #7  
Adivanman
Guest
 
Posts: n/a
Exclamation Flexplate with an HP500 EFI

My two cents,

I am running a standard GM 502 automatic transmission flexplate in the Camaro behind my HP500 EFI and I can tell you from experience that the engine rev's a "whole lot" faster than it did in the boat. I would think that most people would find it too fast in rough water. I can zing it from 2800 RPM to the rev limiter in less time than it takes to shift into second. Another consideration with the EFI motor is that it almost rev's too fast for the stock merc programming.

Again, just me two bits.


Adivanman

http://www.adivanman.homestead.com
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Nordicflame
General Q & A
5
08-25-2008 06:53 AM
cougarman
General Q & A
12
09-13-2007 11:43 AM
Jeff Pierpont
General Q & A
1
10-24-2004 10:33 AM
waterbum
General Q & A
4
04-12-2004 03:03 PM
Bob280Silencer
General Q & A
3
01-30-2004 05:49 PM

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 On
Pingbacks are On
Refbacks are On


Quick Reply: flywheel question


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.