Pushrod Material
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Pushrod Material
I've been looking for some tubing to make a VH pushrod. The original tube was 7/16" OD and 20 thou wall thickness.
I can get:-
1. mild steel seamless tube 7/16" OD, 2mm wall (80 thou) - so likely heavier than the original, but does that really matter in a road engine?
or
2. Stainless tube 7/16" OD 28thou wall. - close to the original dimensions but is stainless Ok to use in this application?
I can't find suitable chromoly tubing.
What would you choose?
I can get:-
1. mild steel seamless tube 7/16" OD, 2mm wall (80 thou) - so likely heavier than the original, but does that really matter in a road engine?
or
2. Stainless tube 7/16" OD 28thou wall. - close to the original dimensions but is stainless Ok to use in this application?
I can't find suitable chromoly tubing.
What would you choose?
KOBI
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
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Re: Pushrod Material
I'd give the stainless a go but use a bit more tappet clearance.Nev
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Re: Pushrod Material
What valve springs have you got? The heavier springs (VS20?) on the iron VH put quite a load on the pushrod so I wouldn't use mild steel.
I would probably go for stainless tubing, however 316 stainless has a thermal expansion 30% greater than mild steel so I would add a couple of thou to the tappets.
The original chromoly tubing in my VH was 1/32" (.031") wall thickness which is about 21g. The nearest I found to this was 4130 with 20g (.036") wall which I eventually got from Germany (at a price). In the US 4130 is as cheap as mild steel but the postage costs seem prohibitive.
Pete
I would probably go for stainless tubing, however 316 stainless has a thermal expansion 30% greater than mild steel so I would add a couple of thou to the tappets.
The original chromoly tubing in my VH was 1/32" (.031") wall thickness which is about 21g. The nearest I found to this was 4130 with 20g (.036") wall which I eventually got from Germany (at a price). In the US 4130 is as cheap as mild steel but the postage costs seem prohibitive.
Pete
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Re: Pushrod Material
Is that cos it overheats on the rear pushrod?...Its a joke....honestPete.Silson wrote: ↑Thu May 23, 2024 11:19 am
I would probably go for stainless tubing, however 316 stainless has a thermal expansion 30% greater than mild steel so I would add a couple of thou to the tappets.
The original chromoly tubing in my VH was 1/32" (.031") wall thickness which is about 21g. The nearest I found to this was 4130 with 20g (.036") wall which I eventually got from Germany (at a price). In the US 4130 is as cheap as mild steel but the postage costs seem prohibitive.
Pete
![Laughing :lol:](./images/smilies/icon_lol.gif)
I'll go for stainless. Can't find chromoly anywhere.
Thanks for the replies.
KOBI
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
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- Holder of a Waxed Cotton Anorak
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Re: Pushrod Material
You're only allowed to make comments like that if you've got a four-potter in your garage.Is that cos it overheats on the rear pushrod?...
I can sell you one if you want.
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Re: Pushrod Material
Sadly my garage is somewhat full Pete...far better it stays in yoursPete.Silson wrote: ↑Thu May 23, 2024 1:03 pmYou're only allowed to make comments like that if you've got a four-potter in your garage.Is that cos it overheats on the rear pushrod?...
I can sell you one if you want.
![Wink ;)](./images/smilies/icon_e_wink.gif)
KOBI
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
-
- Holder of a Waxed Cotton Anorak
- Posts: 547
- Joined: Thu Mar 10, 2011 6:19 pm
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Re: Pushrod Material
I don't have a boat big enough for such a large anchor...
KOBI
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Swindon Branch Combined Operations (Chairman and Secretary)
Ariels - 1913 TT Model, 20 Roadster, 28 Model D, 30 Model B, 38 VH, 52 VH
Velocette MAC, KSS Mk1
Re: Pushrod Material
You should be able to find T45 tube in a suitable size. I wouldn't use stainless for 2 reasons, it's more flexible than a good steel and it's thermal expansion is akin to aluminium.
37 NH special, 54 Gold Star special and a pair of ridiculously modified Honda C90 specials.
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