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Author Topic: The weight saving thread  (Read 351772 times)
ibg
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« Reply #930 on: February 02, 2021, 01:41:12 am »

The end result......  the 5 speed was 5.7 kg heavier than the 4 speed, but I think it was a great result considering the amount of new metal that goes into a 5 speed, not to mention the Quaife.

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I finished up rifle drilling the clutch shaft and a few holes in the arm.

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I hope to fit it in the next few weeks.
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MeXX
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World record holder 8.733 @ 255.658


« Reply #931 on: March 15, 2021, 20:44:11 pm »

Steering wheel with SFI approved quick change hub....
549,6g
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MeXX
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« Reply #932 on: March 21, 2021, 18:01:44 pm »



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MeXX
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« Reply #933 on: March 22, 2021, 11:27:52 am »


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« Last Edit: March 22, 2021, 11:32:47 am by MeXX » Logged

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richie
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« Reply #934 on: March 29, 2021, 18:09:35 pm »

I needed some radio blanking plates and rather than just use "heavy stock metal" ones I decided to make some in carbon Grin 1st one out weighed 13grams [stock is 91g] and fits just like stock Cool have made a few more now & have a couple of extras to sell maybe if there is interest
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Good parts might be expensive but good advice is priceless Wink
richie
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« Reply #935 on: April 02, 2021, 21:31:10 pm »

Had to make a glovebox lid as well, made it double skinned and bonded together so it works like the stocker Cool amazing to see that the stock version is over 0.5kg!!! Shocked
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Good parts might be expensive but good advice is priceless Wink
MeXX
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World record holder 8.733 @ 255.658


« Reply #936 on: April 08, 2021, 19:58:37 pm »

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« Last Edit: April 08, 2021, 20:24:30 pm by MeXX » Logged

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brewsy
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« Reply #937 on: April 08, 2021, 20:19:24 pm »


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What's the before and after Mexx??
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MeXX
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« Reply #938 on: April 08, 2021, 20:25:52 pm »


What's the before and after Mexx??

238g vs 127g per side... So -218g...😜
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ibg
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« Reply #939 on: April 16, 2021, 10:26:09 am »

I finished my new axles for 944 alloy trailing arms.
I got some Vanagon axles gun drilled, and bought lightweight T2 race prep cv's from GKN. I'm also using Stage 8 cv bolts.
I was hoping to get the finished set up lighter than the old T1 axles but I missed by 46 grams  Angry
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richie
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« Reply #940 on: April 18, 2021, 11:32:26 am »

I finished my new axles for 944 alloy trailing arms.
I got some Vanagon axles gun drilled, and bought lightweight T2 race prep cv's from GKN. I'm also using Stage 8 cv bolts.
I was hoping to get the finished set up lighter than the old T1 axles but I missed by 46 grams  Angry
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Good effort getting so close Cool
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Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
ALB
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Posts: 36


« Reply #941 on: May 16, 2021, 15:39:39 pm »

I finished my new axles for 944 alloy trailing arms.
I got some Vanagon axles gun drilled, and bought lightweight T2 race prep cv's from GKN. I'm also using Stage 8 cv bolts.
I was hoping to get the finished set up lighter than the old T1 axles but I missed by 46 grams  Angry

Great project!  What diameter are the Vanagon axles?  Weight before drilling?  How big was the drilled hole and weight after drilling?
Thanks in advance for answering my questions.  Al
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ibg
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« Reply #942 on: May 17, 2021, 03:11:10 am »

Alb, thanks for your interest.
the axles are 27mm, much bigger than T1.
There are formulae for working out the strength lost with drilling, it is approximately 10% for a hole 1/2 the diameter. So the axles are way stronger to start with, and very little strength is lost with the drilling. So I had them drilled with a 13mm drill. I also had them shotpeened to make them less likely to crack and the gun drilling has a very fine finish like reaming/polishing so the inner surface is really good too, no stress risers. You can see the gloss on the finish in the last photo
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you can see the weight loss on the scales, over 1/2 kilo per axle
« Last Edit: May 17, 2021, 03:13:21 am by ibg » Logged
ibg
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« Reply #943 on: June 02, 2021, 03:23:36 am »

I opened the tunnel and got rid of old fuel line, heater control tubes and the jack points.... nearly 2 Kg  Cheesy

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MeXX
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World record holder 8.733 @ 255.658


« Reply #944 on: June 02, 2021, 04:49:30 am »

Shifting rod....

Thin wall CrMo 332.3g
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Vs Carbon 87.7g
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« Last Edit: June 02, 2021, 04:54:18 am by MeXX » Logged

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ibg
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« Reply #945 on: June 02, 2021, 09:18:48 am »

I am very envious, that is very light.
I see a carbon gear shift rod in my future
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MeXX
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World record holder 8.733 @ 255.658


« Reply #946 on: June 02, 2021, 10:15:00 am »

I am very envious, that is very light.
I see a carbon gear shift rod in my future

yep... it is all about weight transfer.....
(to transfer weight out of the car)

MeXX
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dangerous
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« Reply #947 on: June 02, 2021, 12:21:07 pm »

You know what is funny Martin?
My Engine push rods were 350g ea.
 Cheesy Cheesy Cheesy
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ALB
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« Reply #948 on: June 23, 2021, 14:48:34 pm »

Alb, thanks for your interest.
the axles are 27mm, much bigger than T1.
There are formulae for working out the strength lost with drilling, it is approximately 10% for a hole 1/2 the diameter. So the axles are way stronger to start with, and very little strength is lost with the drilling. So I had them drilled with a 13mm drill. I also had them shotpeened to make them less likely to crack and the gun drilling has a very fine finish like reaming/polishing so the inner surface is really good too, no stress risers. You can see the gloss on the finish in the last photo
you can see the weight loss on the scales, over 1/2 kilo per axle

Thanks for posting that.  That kind of weight drop per axle is fantastic! Al
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pupjoint
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Posts: 721


« Reply #949 on: October 10, 2021, 16:11:25 pm »

got some fender bolts made in titanium, could make them even lighter, but i wanted to keep the stock dimensions











40 bolts and washers - less 280g only
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samotorsport
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« Reply #950 on: October 10, 2021, 20:53:47 pm »

Some weight reduction on S:t Moritz




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ibg
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Posts: 113


« Reply #951 on: October 11, 2021, 06:49:18 am »

oh I do like a bit of drilling   Grin  I hope you were able to do it on the pedestal and weld in later.
and those Ti fasteners add up nicely for very little effort, just apply dollars!
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ibg
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Posts: 113


« Reply #952 on: October 15, 2021, 06:00:38 am »

A tale of 2 starters
…..well 4 starters actually.
When I first built my engine I used a standard SR15 starter which is rated at .6 ish kw. But it was unhappy turning over my engine with 9.4 compression, it cranked slow and was pretty heavy (5.3kg)

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So then I got a SR17 stickshift starter in the .7 - .9 kw range and it did well but what a porka, 5.8 kg

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Once I went on my weight loss kick I found the new Brazilian starter 6004AA0021 had the same .9 kw but a whole lot less weight (2.8kg), and cheap too.

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So engine rebuild and 11:1 compression calls for a bit more grunt so the options I could find were:
Wosp 1kw, 1.4kw and 2 kw starting at about 4kg
IMI 1kw, 1.4kw and 2 kw starting at about 3.6kg
And the winner….
Brise 2kw and 2.7kg with a very neat axial gear design

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« Last Edit: October 15, 2021, 06:02:16 am by ibg » Logged
pupjoint
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Posts: 721


« Reply #953 on: October 15, 2021, 14:09:40 pm »

A tale of 2 starters
…..well 4 starters actually.
When I first built my engine I used a standard SR15 starter which is rated at .6 ish kw. But it was unhappy turning over my engine with 9.4 compression, it cranked slow and was pretty heavy (5.3kg)

[ Attachment: You are not allowed to view attachments ]

So then I got a SR17 stickshift starter in the .7 - .9 kw range and it did well but what a porka, 5.8 kg

[ Attachment: You are not allowed to view attachments ]

Once I went on my weight loss kick I found the new Brazilian starter 6004AA0021 had the same .9 kw but a whole lot less weight (2.8kg), and cheap too.

[ Attachment: You are not allowed to view attachments ]

So engine rebuild and 11:1 compression calls for a bit more grunt so the options I could find were:
Wosp 1kw, 1.4kw and 2 kw starting at about 4kg
IMI 1kw, 1.4kw and 2 kw starting at about 3.6kg
And the winner….
Brise 2kw and 2.7kg with a very neat axial gear design

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nice. where can I buy the Brise starter? 
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ibg
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Posts: 113


« Reply #954 on: October 15, 2021, 21:27:18 pm »

I got mine from Brise direct, I sent an email through their web site and Tim Brise sent me an engineering drawing to check if it would fit
https://brise.co.uk/?v=6cc98ba2045f


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pupjoint
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Posts: 721


« Reply #955 on: October 15, 2021, 21:54:40 pm »

I got mine from Brise direct, I sent an email through their web site and Tim Brise sent me an engineering drawing to check if it would fit
https://brise.co.uk/?v=6cc98ba2045f




thanks. looks like they make great stuffs. wish they can also make a proper high amp alternator for the type 1
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