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nada
Banned
Joined: June 03, 2010
Posts: 61
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 Posted: Mon Oct 08, 2012 6:26 pm Post subject: Connecting Rod is too wide for crankshaft |
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I'm building and upright engine for my bay. It has a stock 1600 case, 74mm stroke, and stock 85.5 bore. I started building it up and got to the point where I was going to attach the rods. When I went to attach the first rod, I found that it was too wide to fit.
Here is a picture of the rod.
I measured the inside width of the crankshaft and it was roughly .902" then I measured the outside of the connecting rod - roughly .930". Is this a commonly found problem? I am prepared to purchase new rods if that is necessary. I just found it to be very strange.
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sgmalt46
Samba Member
Joined: April 20, 2005
Posts: 1333
Location: south san francisco
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| Posted: Mon Oct 08, 2012 8:38 pm Post subject: |
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| ?????????? strange. the crank is about normal. those rods are WAY wide? i measured a few i have and there no where near that wide? get another set of rods. or take the time to machine them to fit? not a normal problem. |
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modok
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Joined: October 30, 2009
Posts: 27658
Location: Colorado Springs
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| Posted: Mon Oct 08, 2012 8:41 pm Post subject: |
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| where did you get those rods? |
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GDOG57
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Joined: March 19, 2006
Posts: 1066
Location: Gilbert,Arizona
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| Posted: Mon Oct 08, 2012 10:55 pm Post subject: |
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Are you sure they are not type 4 rods?
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nada
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Joined: June 03, 2010
Posts: 61
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| Posted: Tue Oct 09, 2012 4:04 pm Post subject: |
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They very well could be Type 4 rods! I bought them attached to a supposedly 1600, 69mm crank, but they guy who sold it to me could've been wrong. I only paid 25 for the crank and rods, no big deal. What's odd is that it is setup for a Type 1 engine. I don't know the differences between a Type 1 crank/rods, and a Type 4.
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modok
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Joined: October 30, 2009
Posts: 27658
Location: Colorado Springs
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| Posted: Tue Oct 09, 2012 4:49 pm Post subject: |
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I think all type4 and WBX use a larger piston pin size..........right? that should be a dead giveaway
I donno man, better check the size of both ends and the length before you think about narrowing them, and if you do try to narrow then so the bearing is centered. |
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miniman82
Samba Swamp Donkey
Joined: March 22, 2005
Posts: 9515
Location: Southern Maryland
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| Posted: Tue Oct 09, 2012 6:39 pm Post subject: |
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Doesn't look like a T4 rod to me, but it's hard to tell without a full pic. I have a set of recon Bus 2.0 rods in the garage, they are visibly beefier than that one. A lot heavier too....
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nsracing
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Joined: November 16, 2003
Posts: 9741
Location: NOVA
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| Posted: Tue Oct 09, 2012 7:20 pm Post subject: |
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China rods from hell. 
Waterboxer rods are same on the bigend as Type I..cept larger on the pin end. |
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stealth67vw
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Joined: January 22, 2004
Posts: 1872
Location: Grass Pants, Orygun
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GDOG57
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Joined: March 19, 2006
Posts: 1066
Location: Gilbert,Arizona
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| Posted: Tue Oct 09, 2012 10:33 pm Post subject: |
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Type 4 rods are .127 inches wider than type 1.
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'57 oval window deluxe,Agave green(L240) 2276cc w/51.5 IDA's
'57 type 2 panel ( L31 dove blue) project daily driver,Singleport 1955cc
'69 Squareback (L30A Royal Red) |
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Slow 1200
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Joined: July 02, 2004
Posts: 2127
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| Posted: Wed Oct 10, 2012 3:34 am Post subject: |
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| 40hp rods? |
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anthracitedub
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Joined: June 20, 2007
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Location: Michigan
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| Posted: Wed Oct 10, 2012 5:42 pm Post subject: |
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| ^. X2 |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27658
Location: Colorado Springs
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| Posted: Wed Oct 10, 2012 9:29 pm Post subject: |
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Oh, yeah, I bet your right! 40hp are wider
Don't they use rod bolts instead of bolts and nuts? |
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OLD VW NUT
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Joined: February 23, 2011
Posts: 2776
Location: High Desert of Washington 98823
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| Posted: Wed Oct 10, 2012 9:49 pm Post subject: |
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| Slow 1200 wrote: |
| 40hp rods? |
First thing I thought of too. They can be resized by taking ~.020" off each side - but the pins are only 20mm - won't fit the pistons.
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nada
Banned
Joined: June 03, 2010
Posts: 61
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| Posted: Fri Oct 12, 2012 9:23 am Post subject: |
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The crankshaft is not a crappy Chinese one to my knowledge. I've always heard of SCAT making nice parts. And I decided to not mess with machining rods and just went ahead and bought new ones since they weren't too expensive. Thanks for clearing up what the parts I had belonged to!
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1432
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Location: so cal
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| Posted: Sat Oct 13, 2012 7:15 am Post subject: |
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| OLD VW NUT wrote: |
| Slow 1200 wrote: |
| 40hp rods? |
First thing I thought of too. They can be resized by taking ~.020" off each side - but the pins are only 20mm - won't fit the pistons. |
also shorter and much weaker than 1600 rods |
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