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anthonimartini
Joined: 17 Feb 2020
Posts: 240
Location: portland oregon
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 Posted: Tue Mar 30, 2021 3:58 pm Post subject: |
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ok i ordered them.... lets see what happens. it was 547 usd shipped to portland or.
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ive saved alot of 924's
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83 944
87 924S
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formerly known as turbellion, lost password. |
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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| Posted: Tue Mar 30, 2021 5:26 pm Post subject: |
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| safe ordered these rods aswell, they used to be alot cheaper |
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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| Posted: Tue Mar 30, 2021 5:36 pm Post subject: |
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| what bearings are you going to use |
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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| Posted: Wed Mar 31, 2021 6:34 pm Post subject: |
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| i ordered 8pcs of m104 rods |
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anthonimartini
Joined: 17 Feb 2020
Posts: 240
Location: portland oregon
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| Posted: Sat Apr 03, 2021 2:17 am Post subject: |
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alright so they ended up not having them in stock, they would produce them for me at a cost of about 200 per rod. i backed out. i have given up and and am going to just grind the hell out of my stock rods to lighten them up. ill get them balanced along with the entire rotating assembly and rebushed to 22mm to fit the vw pistons. im also reusing my rod bolts because i cant find any. a #### dumb problem to have but whatever, ive always reused them in the past and driven my engines hard with no problems. the rods um using have 33k on them.
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ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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| Posted: Sat Apr 03, 2021 3:00 am Post subject: |
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| if u want i can sell u 4 of my m104 rods and rodbolts |
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anthonimartini
Joined: 17 Feb 2020
Posts: 240
Location: portland oregon
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| Posted: Sat Apr 03, 2021 4:32 am Post subject: |
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hmm im not sure which those are, what were the specs? do you have a link to them? im very interested!
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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anthonimartini
Joined: 17 Feb 2020
Posts: 240
Location: portland oregon
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| Posted: Sat Apr 03, 2021 4:38 am Post subject: |
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ah i think its these
https://www.hurricanerods.com/products/Racing-Performance-Forged-Conrod-for-Mercedes-Benz-M104-engine.html
those are almost perfect but it leaves us to figure out how to control rod side play. shimming is the answer but you must have the inside wrist pin area of the piston machined perfectly parallel to the surface of the rod. then we must shim them very accurately to about.020" gap. hmm i guess i should talk to my machinist about doing that to the vw pistons. how much do you need for the rods?
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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anthonimartini
Joined: 17 Feb 2020
Posts: 240
Location: portland oregon
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| Posted: Sat Apr 03, 2021 4:42 am Post subject: |
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i wonder if i could weld up the sides of the rods and have them machined to the correct width? i think the hardest park of that would be making sure when machined they were equal on both sides as to not have offset. im sure they could easily resize the big end back if it warps or something.
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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| Posted: Sat Apr 03, 2021 5:21 am Post subject: |
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| anthonimartini wrote: | ah i think its these
https://www.hurricanerods.com/products/Racing-Performance-Forged-Conrod-for-Mercedes-Benz-M104-engine.html
those are almost perfect but it leaves us to figure out how to control rod side play. shimming is the answer but you must have the inside wrist pin area of the piston machined perfectly parallel to the surface of the rod. then we must shim them very accurately to about.020" gap. hmm i guess i should talk to my machinist about doing that to the vw pistons. how much do you need for the rods? |
we go 50/50 on the rods and bolts, i got 8 rods and 2 sets of arp rod bolts. everything total was 521.78 usd so it would be about 260 usd |
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TJC
Joined: 04 Apr 2010
Posts: 828
Location: Northwestern-ish Arizona, USA
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| Posted: Sun Apr 04, 2021 1:37 am Post subject: |
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| anthonimartini wrote: | | i wonder if i could weld up the sides of the rods and have them machined to the correct width? i think the hardest park of that would be making sure when machined they were equal on both sides as to not have offset. i'm sure they could easily resize the big end back if it warps or something. |
Back in the 80's while doing my time in a race/high performance engine machine shop in Phoenix we had a specific application for, if I remember correctly, a Chevy ll midget engine where we used a particular Carrillo rod that needed to be wider at the big end. I forget exactly what tubing we used, could have been 4130 chrome moly, but we chucked it up in the lathe and machined the proper width and diameters of spacer we needed from the tubing, tack welded it to the rod in 3-4 places, carefully "split" it in half at the parting line and simply resized the rod. I remember we also chamfered it to properly coincide with the crankshaft fillet and put a slight chamfer on the parting ends as well. We may or may not have had a dummy crank pin to attach the rod to when we welded on the spacer to keep it in perfect alignment to...can't quite remember!!! BTW, the tack welds were small enough to serve the purpose of keeping the spacer in place while not generating a ton of heat into the rod itself. Any possible deformation was kept at an absolute minimum.
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'95 BMW 318i/5 ..."Pearl"
'87 Porsche 944 NA... "Liebchen"
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Still on the Prowl!
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Juho
Joined: 03 Oct 2018
Posts: 392
Location: Finland
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| Posted: Sun Apr 04, 2021 2:09 am Post subject: |
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| intresting.... i think making spacers on small end keeps things way simpler |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Sun Apr 04, 2021 4:52 am Post subject: |
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Should be zero side load in the that area, no?
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- WeiBe (1987 924S 2.5t) - 931 S3
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anthonimartini
Joined: 17 Feb 2020
Posts: 240
Location: portland oregon
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| Posted: Sun Apr 04, 2021 10:26 am Post subject: |
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it doesnt really matter which end controls the rod but on the big end side ideally you would have .010-020". the small end you have to take into account the larger expansion rate of the aluminum piston. so i think around .040" would be safe. the problem doing it on the wrist pin side is that pistons are not generally designed with this in mind so there isnt a flat parallel surface for the thrust washers to utilize. pretty much any pistons option for us would need to be machined for this. all the cost of trying to use cheaper rods then the expensive pauter or crowers we can actually get starts to add up and even then diy piston controlled rods could be problematic in the long term. this is of course just my opinion and they could work out great if done right.
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password. |
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