We have had hundreds of short tubes made,,,
so, cut pushrods, sort the length needed, press (with loctite) the tubes on & Bob`s you`re Aunty
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| Author: | TheMiniMan [ Sat Jun 23, 2018 1:15 pm ] |
| Post subject: | Re: Pushrod material |
We have had hundreds of short tubes made,,, so, cut pushrods, sort the length needed, press (with loctite) the tubes on & Bob`s you`re Aunty
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| Author: | Ian_B [ Fri Jun 29, 2018 7:43 pm ] |
| Post subject: | Re: Pushrod material |
Thanks Matt He has done them in 4140 solid 8mm .I was surprised Jet Engineering Highly reccommended I can get them tapered I suppose if needed for clearance like the MED ones but I think all good. Thanks mate I was expecting tube. Been a hard day mates funeral but thats done Cheers Ian |
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| Author: | Ian_B [ Wed Aug 08, 2018 7:31 pm ] |
| Post subject: | Re: Pushrod material |
Dry build done all pushrods rotate .I painted them all and every exhaust one has this lovely little pattern from rubbing in one spot . The rods are 8mm solid and im not filing the head anymore ?? Im looking at turning em down somewhat .Not at the ends where the press ins are. Do I go 7mm or back to 6.35 as standard . So close and im glad the guy didnt sell me tubular .Jet Engineering Great bloke and job done well. 
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| Author: | Ian_B [ Sat Aug 11, 2018 4:21 pm ] |
| Post subject: | Re: Pushrod material |
[attachment=0]pia.jpg[/attachment  Peaks are resting on the base circle.The fatter flat bit is maximum lift
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| Author: | simon k [ Sat Aug 11, 2018 6:25 pm ] |
| Post subject: | Re: Pushrod material |
that looks really cool  go to 7mm - you can't machine it back on |
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| Author: | Ian_B [ Sat Aug 11, 2018 6:55 pm ] |
| Post subject: | Re: Pushrod material |
Yea Simon I thought that too lol.An interesting thing is on good advice all the holes in the block were drilled to 1/2 inch. I noticed tonite that number 4 exhaust has this lovely pattern down low at block level and its oh so light I dont think it would be a problem. Its a great learning curve .If I didnt paint them I wouldnt have known.Pattern is cool and tells a story.
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| Author: | FNQ [ Sun Aug 12, 2018 8:33 am ] |
| Post subject: | Re: Pushrod material |
Hi Ian B Not much too add. as you seem to be all over this, but does the rocker geometry play a role? It struck me that if you have already oversized the holes and the scoring is still occurring then maybe the tops are out of alignment? - or more likely the drillings aren't perpendicular to the pushrod path. No idea really, just throwing it out to be shot down- I currently have a block where the two outer holes have been oversized, maybe the machinist was scared of the variability in the castings? I think i read somewhere ( maybe Mr Calver) that the drillings are at a tiny angle and or the angles are different. |
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| Author: | Ian_B [ Sun Aug 12, 2018 7:43 pm ] |
| Post subject: | Re: Pushrod material |
Its not geometry I have that sorted. Its when valves get moved and the pushrod holes dont.Even Vizard wrote about offsetting valves. He didnt talk about the repercussions and I dont think he told everyone to drill the holes in the block 1/2 inch. |
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| Author: | Ian_B [ Mon Aug 13, 2018 9:16 pm ] |
| Post subject: | Re: Pushrod material |
Forget all the machining. Ive took the head off again Was interfering half way down head where there was a high spot.Filed some more and havent broke into ports . Another dry assembly after masking tape and round file and Dyson vacuum cleaner.All looks good and looks like I didnt taper low enough. Tomorrow will tell . 
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| Author: | Ian_B [ Sat Aug 18, 2018 2:30 pm ] |
| Post subject: | Re: Pushrod material |
Nope they still rub Just not as bad .No more filing until I can gauge at what point I will break into a port. Looks like pushrods go to a surgeon. 
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| Author: | Ian_B [ Sat Oct 06, 2018 4:32 pm ] |
| Post subject: | Re: Pushrod material |
Attachment: 20181006_171113.jpg All done My mate ground the 8mm pushrods to 7mm where they go thru the head .Nothing rubs now. Nothing happens fast here but it gets done properly Bullet proof vest on now for Robs smart comments |
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