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captcory
Samba Member
Joined: January 20, 2010
Posts: 101
Location: swfl
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 Posted: Wed Jun 06, 2012 5:01 pm Post subject: type 4 rod bolts |
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| do I need to replace the rod bolts or nuts (or both) on a 1973 porsche 914 2.0L The reason I'm asking is everything that I have searched and read says they are TTY (torque to yield)and you should replace both. I purchased arp 104-6006 bolts and nuts which state they are for both the 1.7 and 2.0, but they are too short. Are the 1.7/1.8 rods different from the 2.0 rods? |
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blue77bay
Samba Member
Joined: February 11, 2006
Posts: 631
Location: Brisvegas Australia
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| Posted: Wed Jun 06, 2012 6:24 pm Post subject: |
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2 lt engines have 50mm journals,1.7and 1.8 lt engines have 55mm journals ,you need the long bolts for 55mm journals and best to replace all the bolts ,you realize you need the rods resized after replacing the bolts
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captcory
Samba Member
Joined: January 20, 2010
Posts: 101
Location: swfl
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| Posted: Thu Jun 07, 2012 4:31 am Post subject: |
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| blue77bay wrote: |
| 2 lt engines have 50mm journals,1.7and 1.8 lt engines have 55mm journals ,you need the long bolts for 55mm journals and best to replace all the bolts ,you realize you need the rods resized after replacing the bolts |
Did you mean to say that the 2lt has the 55mm journals (not 50mm) Then yes I need the longer bolts for the 55mm. Yes rods have been rebushed/resized. Every place That I look for rod bolts only list one for both the 1.7 and 2.0
does anyone know of a place that I can order the rod bolts for a 2.0lt I can't find and place that sells separate sizes sense the 1.7/1.8 and the 2.0 are different sizes. even arp website only lists one bolt (104-6006) for both the 1.7 and 2.0 |
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dawie
Samba Member
Joined: July 27, 2008
Posts: 218
Location: Cape Town, South Africa
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| Posted: Thu Jun 07, 2012 5:24 am Post subject: |
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| The 1.7 and 1.8 has 55mm rod journals. Two liter type 4 (both 914 and bus) have smaller 50mm rod journals. |
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captcory
Samba Member
Joined: January 20, 2010
Posts: 101
Location: swfl
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| Posted: Thu Jun 07, 2012 11:04 am Post subject: |
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Well I can't find the correct bolts that I need, so I called Rimco and they have them and will install and re-size the big end for me.
Sense the bolts are an interference fit they distort the rods when pressing them in...so the big end of the rods need to be re-sized when installing new bolts.as "blue77bay" noted. Thanks for all the help in this matter. |
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GusC2it
Samba Member
Joined: June 23, 2005
Posts: 1376
Location: Orlando, Florida, USA
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| Posted: Thu Jun 07, 2012 2:25 pm Post subject: |
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| dawie wrote: |
| The 1.7 and 1.8 has 55mm rod journals. Two liter type 4 (both 914 and bus) have smaller 50mm rod journals. |
Thanks for correcting that Dawie! BTW, I have 260K miles on my bolts and 3 rebuilds. Runs better then ever and I red line it at 5500. I would be afraid of after market bolts. I wonder what Jake Raby does???? 
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modok
Samba Member
Joined: October 30, 2009
Posts: 27677
Location: Colorado Springs
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| Posted: Thu Jun 07, 2012 6:10 pm Post subject: |
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| If you take a good picture of the rod bolt in question I can likely tell you if it is torque-to yield or not. |
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Jake Raby
Samba Member
Joined: August 23, 2003
Posts: 7433
Location: Aircooled Heaven USA
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| Posted: Thu Jun 07, 2012 8:44 pm Post subject: |
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| Quote: |
| I wonder what Jake Raby does???? |
Hauls 55 gallon drums of stock rods to the scrap yard... Nothing we build utilizes them.
_________________
Jake Raby
Raby Engine Development
www.rabyenginedevelopment.com
"I've never given anyone Hell, I just told them the truth and they thought it was Hell" |
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udidwht
Samba Member
Joined: March 06, 2005
Posts: 3804
Location: Seattle, WA./ HB, Ca./ Shizuoka, Japan
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| Posted: Sat Jun 09, 2012 4:48 am Post subject: |
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| ARP bolts & nuts or nothing. |
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captcory
Samba Member
Joined: January 20, 2010
Posts: 101
Location: swfl
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| Posted: Wed Jun 13, 2012 6:56 pm Post subject: |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27677
Location: Colorado Springs
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| Posted: Thu Jun 14, 2012 12:10 am Post subject: |
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NOT torque to yield
but I see you went the ARP$$$ route, fine with me |
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66brm
Samba Member
Joined: January 25, 2010
Posts: 3676
Location: Perth Western Australia
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| Posted: Thu Jun 14, 2012 12:15 am Post subject: |
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| modok wrote: |
NOT torque to yield
but I see you went the ARP$$$ route, fine with me |
Are you telling due to the hourglass shape Modok?
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| modok wrote: |
| I am an expert at fitting things in holes, been doing it a long time |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27677
Location: Colorado Springs
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| Posted: Thu Jun 14, 2012 12:21 am Post subject: |
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The stretch bolts usually have either a reduced shank size and/or the threads extend WAY longer down the bolt than needed, this allows it to stretch evenly
the old bolt, which is the lower one in the pic, does not look like that at all
the arp bolt does have some of that going on, probably just to reduce stress points and just plain nice design. |
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captcory
Samba Member
Joined: January 20, 2010
Posts: 101
Location: swfl
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| Posted: Thu Jun 14, 2012 6:29 am Post subject: |
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| these are the bolts that are too short. If installed they will only allow the nut to thread on half way. Like I said in the first post I can't find the part number for the longer bolts(arp) these are for the 1.7/1.8 rods. The cost of the arp bolts (if I can find them) and the cost of re-sizing the big end is close to AA h beams with arp bolts.......I may go with the china stuff. |
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