Scoop wrote:
I'm curious as to how you will weld them DEAD straight. The head will want to warp and just either side of the weld will be a weak point I would think?
In a lathe...one end in the Headstock, tuther in the Tailstock
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| Pushrod material https://www.ausmini.com/forums/viewtopic.php?f=5&t=97260 |
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| Author: | Ian_B [ Sun May 27, 2018 6:30 pm ] |
| Post subject: | Pushrod material |
I want to stick with 1/4 diameter for clearance reasons I have two choices to make longer pushrods .Use two sets and mig weld together .I have them. Option two is use 1/4 chrome moly tube and turn down pushrod ends to fit.Have also. Smith pushrods and others do 5/16 for mini in chrome moly.Not 1/4. Problem is me and my mate grab a 300mm length of 1/4 chrome moly tube and we think we can flex it with our hands. It is -049 wall thickness. Help please from engineering peeps |
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| Author: | Scoop [ Sun May 27, 2018 8:22 pm ] |
| Post subject: | Re: Pushrod material |
Why don't you set up an actual test some how and see for sure if it bends, as oppose to you think it bends? The $$$ in the rest of your engine I would not stuff around with any if but and maybes! |
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| Author: | Ian_B [ Mon May 28, 2018 8:49 pm ] |
| Post subject: | Re: Pushrod material |
Welding the buggers together lol.Compressive forces only Spoke to a respected mate today Knows his stuff from experience. Same school of thought as manufacturer Will be TIG but im sure MIG would be fine Weighed up clearance and strength and good advise |
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| Author: | simon k [ Tue May 29, 2018 12:50 pm ] |
| Post subject: | Re: Pushrod material |
Ian_B wrote: Compressive forces only I dunno.... they do have side loading on them - like if one bends (for whatever reason) they don't like being used after they're straightened again |
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| Author: | Ian_B [ Tue May 29, 2018 7:44 pm ] |
| Post subject: | Re: Pushrod material |
Thanks guys I think lots of failures are from rubbing pushrods and coil bind The rocker makes an arc over the valvetip and that rocker is on a shaft so there must be other forces on the rod.How much I dont know. The holes in my block have been drilled to half inch so should be no issue there I think also Simon once bent and restraightened fatigue has prolly started |
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| Author: | Scoop [ Wed May 30, 2018 9:06 am ] |
| Post subject: | Re: Pushrod material |
I'm curious as to how you will weld them DEAD straight. The head will want to warp and just either side of the weld will be a weak point I would think? |
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| Author: | Ian_B [ Wed May 30, 2018 8:05 pm ] |
| Post subject: | Re: Pushrod material |
Yes I agree on weld pulls .My mate suggests they are mass manufactured and arent dead straight anyway Elder pushrods were welded .Scumbag that has my original head will have them too.Getting it going is all that matters now. Dont believe welding was or is an issue .A stepped joint with loctite 601 is a thought i have |
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| Author: | Scoop [ Thu May 31, 2018 8:19 am ] |
| Post subject: | Re: Pushrod material |
How much longer do they need to be? Would it be easier to get some custom depth cam followers or insert some spacers inside them if its only a small amount? Just throwing ideas about! |
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| Author: | Ian_B [ Thu May 31, 2018 8:49 am ] |
| Post subject: | Re: Pushrod material |
Thats a brilliant idea and could have been done except the 1100s bottom end is complete and on gearbox with transfer case flywheel etc on. |
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| Author: | 9YaTaH [ Thu May 31, 2018 12:57 pm ] |
| Post subject: | Re: Pushrod material |
Scoop wrote: I'm curious as to how you will weld them DEAD straight. The head will want to warp and just either side of the weld will be a weak point I would think? In a lathe...one end in the Headstock, tuther in the Tailstock
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| Author: | Ian_B [ Thu May 31, 2018 7:17 pm ] |
| Post subject: | Re: Pushrod material |
9YaTaH wrote: Scoop wrote: I'm curious as to how you will weld them DEAD straight. The head will want to warp and just either side of the weld will be a weak point I would think? In a lathe...one end in the Headstock, tuther in the Tailstock Yep just ran that by Rob He is machinist Welder multiskilled. Another good call .Ken has done it (welded)and offered to do it years back .I dont think there was ever an issue with the welded rods MED appear to be CNC making them for their Arden heads . Previously they appeared to do what looked like an Elder head without the Elder logo. |
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| Author: | Ian_B [ Sat Jun 02, 2018 4:44 pm ] |
| Post subject: | Re: Pushrod material |
Filing holes for standard pushrod Hoping 5/16 works |
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| Author: | Ian_B [ Sat Jun 02, 2018 6:18 pm ] |
| Post subject: | Re: Pushrod material |
Sometimes ya gotta put the hard yards in for the end result. |
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| Author: | justfanginaround [ Sat Jun 02, 2018 7:21 pm ] |
| Post subject: | Re: Pushrod material |
bore the cam follower tunnels out a bit and use grey motor holden ones, they come in 2 different base thicknesses - use the thicker ones. I'd assume the block is off the gearbox atm as you are putting fillings down the pushrod holes ..... |
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| Author: | Ian_B [ Sun Jun 03, 2018 8:43 am ] |
| Post subject: | Re: Pushrod material |
No this is the head needed a little relieving.The holes in the block have been drilled to half inch. Thanks for the info on grey motor followers.I think thats how racers are able to use more radical cam profiles |
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