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ARP Rod Bolts Group buy?
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safe  



Joined: 18 Mar 2017
Posts: 163
Location: Sweden

PostPosted: Tue Dec 17, 2019 8:09 am    Post subject: Reply with quote

Juho wrote:
safe wrote:
Fasteddie313 wrote:

safe's pic resized..


Thanks!

Well, for the brave you can go with this:
https://www.aliexpress.com/item/32782381728.html
Fake ARPs included!



SOMEONE MUST TRY THESE, imagine if they were actually good.


I have a set, they were only 180$ when i bought them. Looks and feels as nice as a set of carillos or something.
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Juho  



Joined: 03 Oct 2018
Posts: 125
Location: Finland

PostPosted: Tue Dec 17, 2019 8:11 am    Post subject: Reply with quote

Damn, if they still were so cheap i would probaly get them, aliexpress pistons to go with them ofc
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1972
Location: Somerset, UK

PostPosted: Tue Dec 17, 2019 6:21 pm    Post subject: Reply with quote

Juho wrote:
safe wrote:
Fasteddie313 wrote:

safe's pic resized..


Thanks!

Well, for the brave you can go with this:
https://www.aliexpress.com/item/32782381728.html
Fake ARPs included!



SOMEONE MUST TRY THESE, imagine if they were actually good.


Not on a 2.0 block we wonít be.......
_________________
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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safe  



Joined: 18 Mar 2017
Posts: 163
Location: Sweden

PostPosted: Tue Dec 17, 2019 6:26 pm    Post subject: Reply with quote

Carrera RSR wrote:
Juho wrote:
safe wrote:
Fasteddie313 wrote:

safe's pic resized..


Thanks!

Well, for the brave you can go with this:
https://www.aliexpress.com/item/32782381728.html
Fake ARPs included!



SOMEONE MUST TRY THESE, imagine if they were actually good.


Not on a 2.0 block we wonít be.......


Yes, we will!
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Euro924S2  



Joined: 06 Mar 2008
Posts: 183
Location: UK

PostPosted: Tue Dec 17, 2019 7:18 pm    Post subject: Reply with quote

Carrera RSR wrote:
Juho wrote:
safe wrote:
Fasteddie313 wrote:

safe's pic resized..


Thanks!

Well, for the brave you can go with this:
https://www.aliexpress.com/item/32782381728.html
Fake ARPs included!



SOMEONE MUST TRY THESE, imagine if they were actually good.


Not on a 2.0 block we wonít be.......


Correct sizes for 2.0l block Steve. They are just too cheap to try and ruin and expensive engine re-build! That's the trouble!

I've done extensive searching on the net, helped by work previously documented on here looking for a rod from another manufacturer that will fit. There isn't a straight swap is the quick answer! The long answer is the big end size is the issue. the 924 has fairly big diameter and certainly very wide big end journals. Rods with either the same diameter or the same width are available but not both. The closes rod with same width would need 3mm taking off the diameter of the crank - not ideal for a higher HP build. The correct diameter rod is too narrow and therefore would rely on the piston maintaining the rod central in the bore. Whilst this is a known method, I don't like the idea of the tail wagging the dog and surely there could be a large angular load on the rod during the compression stroke. Stock rods aren't light but they are strong and reliable. I'm still potentially in for ARP provided they are not crazy money. The re-usability is a winner in my application. I'll be using lighter pistons (flat tops) but rev'ing higher too.
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UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
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safe  



Joined: 18 Mar 2017
Posts: 163
Location: Sweden

PostPosted: Tue Dec 17, 2019 7:31 pm    Post subject: Reply with quote

Euro924S2 wrote:
The closes rod with same width would need 3mm taking off the diameter of the crank - not ideal for a higher HP build. .


What rods have you found?
A 3 mm offset grind could be attractive...
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Euro924S2  



Joined: 06 Mar 2008
Posts: 183
Location: UK

PostPosted: Tue Dec 17, 2019 8:01 pm    Post subject: Reply with quote

OEM specs:
BE bore = 51.6mm
BE width = 27.9mm
SE bore = 24mm
C-C length = 144mm


Mitsubishi 4g63 Gen 1 - With an offset grind this would increase stroke.
BE bore = 47.998mm
BE width = 28.3mm
SE bore = ?mm
C-C length = 150mm

There is a renault rod with simlar specs to above but with 144 rod length IIRC but can't find the screenshot atm.

There is also an option from the E30 BMW early model with a 144 rod length and suitable BE diameter, but narrower than the 924, so would need spacers in the piston to control the rod. This is apparently common in Volvo and Merc engines. *this is from Gegge's post on here a few years back.

_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
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safe  



Joined: 18 Mar 2017
Posts: 163
Location: Sweden

PostPosted: Tue Dec 17, 2019 10:19 pm    Post subject: Reply with quote

Euro924S2 wrote:

There is also an option from the E30 BMW early model with a 144 rod length and suitable BE diameter, but narrower than the 924, so would need spacers in the piston to control the rod. This is apparently common in Volvo and Merc engines. *this is from Gegge's post on here a few years back.


It would require that the pistons are "square" to the bore and rod bolt so they can act as a bearing surface in conjunction with the spacer. I'm not sure thats true about the stock pistons or VW flat tops, probably som machining required.
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Euro924S2  



Joined: 06 Mar 2008
Posts: 183
Location: UK

PostPosted: Wed Dec 18, 2019 1:10 am    Post subject: Reply with quote

True. My machine shop asked for me to take a piston in to check readability, but given my 16v head has needed so much work, I decided to stick with stock 924 rods to reduce the risk of something coming through the new head prematurely! Thatís also the reason I want some ARP rod bolts if we can pull off a group buy....
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp
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Power Tryp  



Joined: 16 Apr 2009
Posts: 430
Location: Calgary, Alberta

PostPosted: Wed Dec 18, 2019 5:11 am    Post subject: Reply with quote

Not that it helps the Euro guys too much but Pauter has a listting for for both early 2.0L and later 2.0L engines.

Pauter Rods Website
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Melanie - 1980 931
Scrappy - 1980 924 shell
NoName - 1980 931 (seeking rebuild)

Green tartan interior, you don't see that on a Civic.
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924-76  



Joined: 05 Jun 2006
Posts: 1412
Location: Ontario, Canada

PostPosted: Thu Jan 02, 2020 4:29 am    Post subject: Reply with quote

Are we going forward with this group buy?
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 900
Location: Maysville, Colorado

PostPosted: Thu Jan 02, 2020 6:23 am    Post subject: Reply with quote

I'm waiting to hear back from ARP. Probably be next week.
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Mike
Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
'77 924
cricketdesigns.com
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924-76  



Joined: 05 Jun 2006
Posts: 1412
Location: Ontario, Canada

PostPosted: Thu Jan 02, 2020 6:28 am    Post subject: Reply with quote

Cool!
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP
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924-76  



Joined: 05 Jun 2006
Posts: 1412
Location: Ontario, Canada

PostPosted: Sat Jan 18, 2020 12:57 am    Post subject: Reply with quote

Any update?
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP
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mattaebersold  



Joined: 12 Dec 2018
Posts: 14
Location: Washington, United States

PostPosted: Wed Jan 22, 2020 9:42 am    Post subject: Reply with quote

Iím 100% in for turbo/931 reusable bolts/studs if I can participate here
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2005 Touareg V8
2006 530xi Wagon
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