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Push Rods

Albervin

Well Known and Active Forum Website User
VOC Member
Does anyone know of a source for push rods longer than 6"? I have been asked by someone who is contemplating the build of bored and stroke motor.
He says that 6 1/8" or 6 3/16" would be ideal. Thanks.
 

ET43

Guest
For what it is worth, my 90 x 100 engine uses standard sized pushrods so I can only guess that Albervin's friend is intending to use a longer barrel in his quest for capacity. I wonder what the stroke can be taken up to, that is, in standard cases. I'll go back to sleep now.
Cheers, ET43
 

Steve F

Active Forum Website User
Non-VOC Member
Smiths in USA did a great job for me

I sent them one of my /2 BMW rods and had them copy and make me a set in aluminium. The set (of course it is a BMW) was far less than an original steel BMW set. I'm sure somebody in Europe offers this service, however push rods aren't heavy so distance/postage shouldn't be a big factor.

Have fun
 

davidd

Well Known and Active Forum Website User
VOC Member
Dear Metal Bits,

I do not think HE30 would be the best choice. If I remember correctly, my machinist is using 2024. I think HE30 is 6083 maybe? The pushrod made of 7075 bent in the first race. It turned out that 2024 although lower in room temp tensile strength, kept a higher percentage of its strength at a higher the temp. Send me a PM if you want me to call him to verify. I have used both types of pushrods, namely, steel end and all aluminum. I do not think it makes much difference assuming you take the time to maximize the ball and cup contact area. This can be done with a stone or lapping in a drill press. The last pair I had made are all aluminum.

David
 
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vibrac

Well Known and Active Forum Website User
VOC Member
Dear Metal Bits,

I do not think HE30 would be the best choice. If I remember correctly, my machinist is using 2024. I think HE30 is 6083 maybe? The pushrod made of 7075 bent in the first race. It turned out that 2024 although lower in room temp tensile strength, kept a higher percentage of its strength at a higher the temp. Send me a PM if you want me to call him to verify. I have used both types of pushrods, namely, steel end and all aluminum. I do not think it makes much difference assuming you take the time to maximize the ball and cup contact area. This can be done with a stone or lapping in a drill press. The last pair I had made are all aluminum.

David

What is wrong with titanium? I have a foot of 8mm but I guess it would take a lot of turning tools
 
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