Hot Rod Forum : Hotrodders Bulletin Board

Hot Rod Forum : Hotrodders Bulletin Board (
-   Transmission - Rearend (
-   -   Tilton button flywheel info (

Sukhoi 10-04-2012 02:24 AM

Tilton button flywheel info
Hi all,
Am new here this is my first post, am BMW owner, I never owned a car with SBC but I always admire them for the insane power numbers, anyhow am here today looking for help from you guys.

Small intro about my BMW engine for people who are not familer with BMW engines:

Engine : m50b25 (2.5L) stroked with forged internals to reach 3.0L, this engine have straight six cylinders with 84mm piston bore and 24 valves head, I boosted my engine with kind of big turbo, the power goal is to reach around 800hp, and I want a strong clutch to hold this power.

I always seen Tilton clutches on your engines, as I decided to go with this, so I bought Tilton 7.25" (OTII) triple plate, but I don't know how to fit it now, I searched on internet to see the best way I can do this, I found that there are some companies that make flywheels for 7.25" tilton and quarter master clutches specially for my engine, but the prices are too high for me.

I found that you guys can fit button flywheel to a flexplate, so you can have light weight flywheel, I liked the idea, but there are no button flywheels for my engine, so I want to custom maid one from strong steel like steel 52, or what can handle power, and fit it on automatic flywheel, the auto flywheel are so light which can rev high.

My clutch kit have ACE sintered disks, and I noticed that when I put all the plates and disks inside the cover, they are little bit higher than the cover legs, like about 0.079"-0.099", and am not sure if this correct thing, cuz every flywheel and button flywheel I saw for tilton have the disk area little bit higher that the clutch legs area, so what do you think guys? is it ok or what?

Other thing, as its based on my above question, I want to fabricate button flywheel as I said before, so should I do it to have higher area on where the disks contacts the button flywheel or just flat?

higher area on where the disks contacts the button flywheel

Or just like this flat button flywheel on flexplate

thanks in advance for your help guys :)


lmsport 10-04-2012 08:05 AM

If you value having feet, get a flywheel made by someone that knows how to make flywheels. I have had a couple flywheels custom made by Tilton and while expensive, they worked right the first time and I had no doubts about their durability.

Sukhoi 10-05-2012 02:14 PM

fro sure I value my feet, I have seen accidents from crappy made flywheels, as am not going to do it by myself, I know someone that makes flywheels, but he used to make normal flywheels, he is not used to deal with triple plates, as I showed him the photos, he just wanted to make sure if it should be flat or not, as he suggested to make it to be able to bolt on the same area on the crank, I liked the idea, it will be like 2 different pieces connected to the crank by bolts, so I think it will be safe, as I will do some heat treatment to the button, so what do you think?!

lmsport 10-05-2012 02:31 PM

The Tilton ctalog says that all their OT-II clutches use a flywheel with a 0.100" step from the cover mounting surface to the friction surface.

I would think that there are some BMW spealists that sell M50 flywheels already engineered for your application.

Sukhoi 10-05-2012 02:53 PM

yes there is one, and it costs 600$ is that Ok price for such flywheel??

Sukhoi 10-16-2012 12:59 AM

I have gone with your advice and went with ready made flywheel, I found one with good price that accept the Tilton clutch and bolts on the engine as stock.

Now I have different question for the gearbox, but am going to start new post for that :)

All times are GMT -6. The time now is 03:14 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.