Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Performance Paddock

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-13-2018, 10:28 PM
Registered User
 
Join Date: Jan 2015
Location: Quebec City, Canada
Posts: 61
Anybody ever had the flywheel lightened? M102/717.412

I have a 2.3 M102 190E that I'm converting to MS2 fuel+spark. I will also put a 717.412 behind it instead of the automatic transmission. I'm not trying to achieve insane power, I just want the car to feel "crisp". The car already has the usual chassis upgrades like Sportline bushings, Bilstein B8's, Eibachs and SS brake lines. I know I can achieve that crisp feeling with the details, like delrin shifter bushing, stiff mounts, good throttle response, etc...

I have a single mass flywheel for a 8.5" clutch. I weighted it and it weights about 24 lbs. I found this picture on my computer that I probably saved from a while ago. I do not remember where it comes from or who did that or how it worked out for that person after he installed it. It looks like this flywheel had the outer part removed. From my estimations, this should reduce weight by about 5.6 lbs, bringing the total weight to 18.4 lbs.


I'd like to know if anyone here did this before, how much you took off, what was the final weight, etc... It took me a while to find a flywheel for sale and I would not like to ruin this one by taking too much weight off of it.
Reply With Quote
  #2  
Old 06-14-2018, 01:13 AM
Registered User
 
Join Date: Aug 2007
Location: Southern California
Posts: 349
I lightened my M103 flywheel from 21.6 lb to 17 lb

Before:




After:




Been about 8 years since I did that and I recently had it resurfaced for a new clutch and pressure plate.



Edit: is the 717.412 a dual mass or single mass flywheel transmission?
Attached Thumbnails
Anybody ever had the flywheel lightened? M102/717.412-screenshot-2018-06-13-22-13-00.png  

Last edited by John5788; 06-14-2018 at 04:08 PM.
Reply With Quote
  #3  
Old 06-14-2018, 09:56 PM
Registered User
 
Join Date: Jan 2015
Location: Quebec City, Canada
Posts: 61
Thanks! I wasn't expecting such a fast answer! Did it make a good difference in driving feel?

412 and 411 are single mass.
Reply With Quote
  #4  
Old 06-14-2018, 11:20 PM
Registered User
 
Join Date: Jan 2012
Posts: 5,801
A light flywheel will:

Make for a rougher idle.

Make it more difficult to pull out on a hill.

Increase transmission gear rattle when in neutral / clutch engaged.

Increase HP if measured on an inertia dyno but make zero increase on a loading dyno.
Reply With Quote
  #5  
Old 06-15-2018, 12:47 AM
Registered User
 
Join Date: Aug 2007
Location: Southern California
Posts: 349
Quote:
Originally Posted by Rocambolesque View Post
Thanks! I wasn't expecting such a fast answer! Did it make a good difference in driving feel?

412 and 411 are single mass.
I never drove the car without flywheel lightened so I don't have a comparison. But I don't really have any complaints about it, drives just fine and idles very smooth.

My situation is different than yours though since my motor is an inline 6 while you are on inline 4. SL320 may be right about having a rougher idle due to that difference.
Reply With Quote
  #6  
Old 06-15-2018, 09:07 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 32,268
A lighter flywheel will allow the engine to accelerate and decellerate faster. this will help in an autocross. It also will make the engine feel quicker and more sporty. it won't affect sustained power as noted by 320 above but it will feel quicker. With your other mods it should fit right in.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #7  
Old 06-17-2018, 01:52 PM
88Black560SL
 
Join Date: Oct 2004
Location: NC
Posts: 2,862
I did one for a guy who raced a 4 cyl car I believe it was a Hundi. I just put it on my 11" lathe and cut the back of it down. No balancing just cut and use as is. He had no issues with it.
__________________
To see my 129 parts for sale visit:
http://stores.ebay.com/The-Mercedes-SL-Store
John Roncallo
Reply With Quote
  #8  
Old 06-17-2018, 05:25 PM
Registered User
 
Join Date: Jan 2012
Posts: 5,801
Quote:
Originally Posted by Roncallo View Post
I did one for a guy who raced a 4 cyl car I believe it was a Hundi. I just put it on my 11" lathe and cut the back of it down. No balancing just cut and use as is. He had no issues with it.

A brake disc / drum lathe works just fine too.

If the profile of the fw casting does not change one can get away without a rebalance.

If the casting is off center and lightening changes the off center areas, rebalancing will be needed.
Reply With Quote
  #9  
Old 06-18-2018, 09:13 PM
Registered User
 
Join Date: Jan 2015
Location: Quebec City, Canada
Posts: 61
For sure I will have it rebalanced. Too much to risk! Thanks guys
Reply With Quote
Reply

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 12:07 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page