Anyone have pics of a lightened flywheel?

Bobbieslandy · Postby **Bobbieslandy** » 29 Mar 2010 19:15

At some point over the weekend i'm going to take some weight off of a sprint flywheel and i'd like to know where to take it from. i have a few ideas but don't really want it taking my ankles off!

Thanks!

Rob.

Beans · Postby **Beans** » 29 Mar 2010 20:21

The ridge at the back was removed from this TR7 flywheel, making it approx. 1,5 kg lighter

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

Bobbieslandy · Postby **Bobbieslandy** » 29 Mar 2010 21:59

i can see three ridges, working from the ring gear inwards there's a 2" (ish) flat section, then a slight step up to another flat section around half an inch wide, an incline around maybe 3/4" wide and another 3/4" incline up to the mating face to the crank. Was the metal removed so that the mating face of the crank and all inlcines reduced to be flush with the first 2" section?

Cheers for the pic Beans, decided to completely strip the engine and rebuild it. i wasnt planning on it but it has to be done!

Really appreciate the help!

Rob.

Beans · Postby **Beans** » 30 Mar 2010 16:41

If you're lucky I have an original TR7 flywheel lying around in the shed.
If so I'll take some pictures tomorrow evening when I'll be working on the car.
It should be clear what was removed .... if it can wait that long [:p]

b.t.w. youâ€™re talking about a Sprint flywheel, if I remember correctly they are lighter than a TR7 flywheel as they don't have the ridge at the back.

<center>

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

Beans · Postby **Beans** » 31 Mar 2010 18:48

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Beans

... If so I'll take some pictures tomorrow evening when I'll be working on the car ... <hr height="1" noshade id="quote"></blockquote id="quote">
Just back from the shed, so as promised ...

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

Bobbieslandy · Postby **Bobbieslandy** » 01 Apr 2010 16:47

Beans you're a diamond! i really appreciate you taking the time to take the photo and post it on here. Is that a lightened Sprint flywheel?

Thanks again Beans,

Rob.

Beans · Postby **Beans** » 01 Apr 2010 21:04

No last picture is of a standard TR7 fly wheel,
first picture I posted is of a lightened TR7 fly wheel (minus approx. 1.5 kg).
<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Bobbieslandy

Beans you're a diamond! ...<hr height="1" noshade id="quote"></blockquote id="quote">
mmm .... Diamonds Are Forever [:D]

<center>

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>

Shauniedawn · Postby **Shauniedawn** » 01 Apr 2010 22:26

Lightened flywheel for you:

Shaun

Shauniedawn · Postby **Shauniedawn** » 01 Apr 2010 22:28

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Beans

The ridge at the back was removed from this TR7 flywheel, making it approx. 1,5 kg lighter

1980 TR7 DHC (my first car, currently being restored)
1981 TR7 FHC Sprint (better known as 't Kreng)
[url="http://www.tr7beans.blogspot.com/"]My Weblog[/url]</center>
<hr height="1" noshade id="quote"></blockquote id="quote">

Makes it look like a standard sprint flywheel. I'll dig one out over the weekend and photograph it next to a standard TR7 one.

Shaun

Shauniedawn · Postby **Shauniedawn** » 01 Apr 2010 22:31

Someone elses version next to a standard sprint flywheel:

Shaun

Shauniedawn · Postby **Shauniedawn** » 01 Apr 2010 22:35

And probably the best way to do it taking the main weight from the outer edge. Really need to employ a machine shop for this work - unless you have a decent mill and rotary table.

Shaun

Shauniedawn · Postby **Shauniedawn** » 01 Apr 2010 22:39

And another version - really exposing the ring gear. Not much support left for it - but maybe that's okay?

Shaun

willywonka · Postby **willywonka** » 02 Apr 2010 08:03

Shaun.

Do you have any dimensional drawings for the lighted flywheel you could share with us?

All the Gear, no idea

Bobbieslandy · Postby **Bobbieslandy** » 02 Apr 2010 08:08

That's fantastic information guys, seems like there's a few ways to lighten it. So to sum up, most of the weight is taken from the back, the outside edge is tapered from the ring gear inwards along with what looks to be a complete skim across the face. Anything less than 6kg makes the car a bit of a handful (to be honest, without milling it i don't reckon i could get near that) so as long as it's a few KGs less than 10KG and no less than 6 we're laughing. I'll be doing this on an old 1970s Colchester triumph 2000 lathe, it's in pretty good condition and is accurate enough. Is there any thoughts on having the flywheel balanced?

Thanks again chaps!

Rob.

macmattom · Postby **macmattom** » 02 Apr 2010 10:14

This is a really good thread, and an example of how helpful this forum is. I have followed it with interest, but can anybody explain the benefits of lightening the flywheel. I'm assuming it has something to do with improving performance, but what kind of improvements can be expected. What are the dangers of taking too much weight off? Probably obvious to most, but something I'd like to investigate.

Cheers,

Mac

The pheonix rises from the ashes - just give it time!

(two and a half years and counting - but who's counting!!)

http://s733.photobucket.com/albums/ww338/macmattom/

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Anyone have pics of a lightened flywheel?

Anyone have pics of a lightened flywheel?

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