924Board.org

[safe]

I need 24mm pin rods. I've contacted Auto Verdi, but they were busy until after the summer, which is okey for me.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe

[Juho]

[Euro924S2]

Ok, let me know when they are ready! Might not make it into this engine but still potentially interested for the next build!
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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

[Juho]

Where did u get those forged flat tops from?

[gegge]

[Euro924S2]

Thanks Carl for posting a link. If you google there are several suppliers but stock is sometimes an issue. Search 87mm type 1 vw forged pistons. There is chat on the internet they are not ‘proper forged’ but this is suggested by a competing company ‘AA’ who make a hyperelutic (spelling) piston which is supposedly between cast and forged for strength.

Personally though, my 924 has been supercharged at over 18psi for more than 9 or 10 years now with the stock 931 cast pistons and despite some knock whilst tuning I’ve not had a piston failure or ring break. I think EFI and modern control systems add a good safety net over the CIS system which gives little warning of problems causing a lean cylinder until something fails.

https://www.justkampers.com/311-198-069-87f-mahle-set-of-forged-barrels-and-pistons-87mm-1641cc-vw-type-1-1500-1600cc-engines.html?fee=1&fep=26452&utm_source=google&utm_medium=cpc&utm_campaign=PLAs&gclid=CjwKCAjw1uiEBhBzEiwAO9B_HWCQRcrSnBc-IaCKdoOegUpOnBmvNAYjY3wulRuS_GF0BcnBk_S4YxoCAsoQAvD_BwE
_________________
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

[Coco_Lev]

Hi,

Today, MESPIECESAUTO added the rods you asked them for the 924.
https://www.mespiecesauto.com/en/produit/bielle-forgee-porsche-924/
Besides them, the rods has been designed to use the 200-6209 ARP rod screws you will need to buy apart.
English translation incoming.

They also made exhaust valves for 931 models, available on the website

[safe]

[Euro924S2]

Do other forged rods have the small end oil supply Safe? Seems a shame to lose that if it is the case although I don’t know how many engines have them or the consequences of losing it.

The website doesn’t list a weight for these rods - that would be useful to know.
_________________
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

[safe]

[Euro924S2]

Thanks Safe.
Do you have a photo of your AliExpress rods? I looked for the xpeeding ones as they seem to be available for most models but none for our 924 2L.

I agree I don’t like the idea of drilling oil holes.

I’ll dig out my spare stock rods tomorrow and have a look more closely at them.

Ease of torquing the rod bolts is fairly important, however if they hit the block it’s a game over! Surely that’s been verified before selling these newly released ones though?

Cheers,
John
_________________
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

[safe]

[Euro924S2]

Good to know. I’m in 2 minds what to do! Not a part I want to be modifying as the cost of failure is significant both in money and time off the road!

That said, with VW flat top pistons I need for the 16v head, I need either a new rod or a bushing so I thought a rod was a good way to go, but these would need a rod and a bushing.....

I’ve been running up to 22psi boost on my current engine with no issues on stock rods! Granted that boost isn’t being translated into the appropriate Bhp, but the torque figure has been at 240lbft for over 5 years with no issues - stock rods are strong as hell, just a bit heavy!
_________________
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

[safe]

22 psi, I'll go there with this engine then:) ! I'm building a stronger engine with forged pistons and a proper machined block.

I took some pictures and weight (696g ish), not sure if these links work, otherwise I can email them to you.

https://photos.app.goo.gl/X1AESKyxcZGSoubN6

https://photos.app.goo.gl/qt1hBgWMC4WbEMJv7

https://photos.app.goo.gl/9YvUzG2MGRS2eNmKA
_________________
/Magnus, Stockholm Sweden
=======================
Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe

[Euro924S2]

Thanks, I see what you mean about the underside oiler and bolt access now!

There was discussion on here of another set of rods being commissioned but yet to hear back on the design specifics.

Seems odd to design these with the rods the wrong way around, given they aren’t just an established part (otherwise we could just use those anyway!) If making the tooling from scratch, why not make the installation more straightforward??

Any one know??
_________________
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