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ARP Rod Bolts Group buy?
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 928
Location: Maysville, Colorado

PostPosted: Wed Dec 04, 2019 3:34 am    Post subject: ARP Rod Bolts Group buy? Reply with quote

I have been thinking it might be time to get some more rod bolts made by ARP. I think I could do it thru my local motor machinist if I handled all the details and money. I have no idea of the price per set last time or the minimum number of sets( I believe it was 10).

I'm retired and will be home for several months so have time to deal with it.

Let me know if you have interest and if 10 sets come up I'll pursue it. I would be in for 1.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
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CÚdric  



Joined: 27 Aug 2004
Posts: 1994
Location: Sweden

PostPosted: Wed Dec 04, 2019 4:58 am    Post subject: Reply with quote

Im interested in a set. Could it be a good idea to check with the UK club if there are any interested guys there to get to 10 pcs.?
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924RACR  



Joined: 29 Jul 2001
Posts: 8334
Location: Royal Oak, MI, USA

PostPosted: Wed Dec 04, 2019 4:58 am    Post subject: Reply with quote

I'd definitely be in for one, maybe two depending on price.
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Vaughan Scott
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1102
Location: Washington DC area

PostPosted: Wed Dec 04, 2019 6:35 am    Post subject: Reply with quote

I'd be in for a couple sets.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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GregSC  



Joined: 19 Jul 2008
Posts: 93
Location: Lovely, KY

PostPosted: Wed Dec 04, 2019 6:47 am    Post subject: Reply with quote

I'd be in for at least one set.
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safe  



Joined: 18 Mar 2017
Posts: 171
Location: Sweden

PostPosted: Wed Dec 04, 2019 8:01 am    Post subject: Reply with quote

Depending on price, yes I could be interested, never know when you want to build another engine. Ideolas price was $285 from an invoice I have.
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 928
Location: Maysville, Colorado

PostPosted: Wed Dec 04, 2019 8:08 am    Post subject: Reply with quote

How would I get in touch with the UK group?l
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 2036
Location: MI

PostPosted: Wed Dec 04, 2019 9:12 am    Post subject: Reply with quote

Maybe..
Will they be eternally reusable like ARP head studs?
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 928
Location: Maysville, Colorado

PostPosted: Wed Dec 04, 2019 9:23 am    Post subject: Reply with quote

Yes, they are reusable.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
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Fasteddie313  



Joined: 29 Sep 2013
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Location: MI

PostPosted: Wed Dec 04, 2019 9:26 am    Post subject: Reply with quote

Can anyone post the specs of these bolts here?
Diameter, pitch, length and stuff?
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1102
Location: Washington DC area

PostPosted: Wed Dec 04, 2019 9:35 am    Post subject: Reply with quote

I just looked to see if I had another set that I got from Dan. Nope. Now I'm committing to three sets.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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safe  



Joined: 18 Mar 2017
Posts: 171
Location: Sweden

PostPosted: Wed Dec 04, 2019 6:03 pm    Post subject: Reply with quote

Fasteddie313 wrote:
Can anyone post the specs of these bolts here?
Diameter, pitch, length and stuff?


From the Ideola website:
"OEM replacements for the Porsche 924 / 931 2.0L rod bolts are NLA. Fortunately, in 2008, we were successful in commissioning an aftermarket replacement for the stock units, which are now a catalog item from ARP.

The part number is AR336. These units are made from a higher grade material (ARP2000) than OEM replacement due to the demand in the aftermarket for a rod bolt suitable on higher-than-stock forced induction applications. These rod bolts and are rated at 220 ksi."

"924 2.0L Nuts for Rod Bolts
Set of 8 10mm x 1.0 12-point nuts suitable for the 924/931 2.0L AR336 rod bolts."
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2005
Location: Somerset, UK

PostPosted: Wed Dec 04, 2019 6:19 pm    Post subject: Reply with quote

MikeJinCO wrote:
How would I get in touch with the UK group?l


Done ...... https://porsche924.co.uk/forum/viewtopic.php?f=14&t=34022
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Then www.924board.org/viewtopic.php?t=31252
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Juho  



Joined: 03 Oct 2018
Posts: 125
Location: Finland

PostPosted: Wed Dec 04, 2019 7:27 pm    Post subject: Reply with quote

Might be intrested in a set, how big of a upgrade they are and are they worth the price?
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2005
Location: Somerset, UK

PostPosted: Wed Dec 04, 2019 8:57 pm    Post subject: Reply with quote

Juho wrote:
Might be intrested in a set, how big of a upgrade they are and are they worth the price?


On a stock NA, they are recommended to be replaced ..... but are not always needed and you could reuse the old. Depends on your state of risk aversion.

On a stock turbo, recommended to change bolts on rebuild, but if you are feeling lucky, don't over rev or overly boost, you may get away with reusing. Not the best advice.

On a high revving NA or over boosted turbo you must replace the bolts or internal damage may ensue.

Stock bolts would suffice but they are long time NLA. So ARP is the only option except they are not a stock item and have to be bought in minimums of 10 sets direct from ARP. Not necessarily seen as an upgrade.....but ARP does sell themselves as superior to OEM. No idea if this is true on rod bolts spec? But they are your only option.....so you have to pay the price of new bolts and nuts. Think I paid circa $200 on the last set I bought with nuts.



To boost order numbers, may be worth contacting Mittelmotor who stock them but do run out of supplies. I think EBS Racing also do/did?
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252
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