924Board.org

anthonimartini · Joined: 17 Feb 2020 Posts: 240 Location: portland oregon

so my dprod style engine is pretty much ready to assemble but im having a hell of a time finding a machine shop to rebush my stock rods to 22mm to use the vw flat tops. does anybody know of a shop that can do it?
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ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password.

MikeJinCO · Posted: Sun Jun 20, 2021 9:17 am Post subject:

Call EBS Racing in Reno, they can get bushings(I think Crower) to resize the 24mm to 22mm.
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Mike

'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)

anthonimartini · Joined: 17 Feb 2020 Posts: 240 Location: portland oregon

thanks! im gonna try and contact crower directly.
_________________
ive saved alot of 924's
current:
79 MochaSchwartz 931
83 944
87 924S
Instagram @anthoni.jpeg
formerly known as turbellion, lost password.

Mike9311 · Joined: 14 Dec 2004 Posts: 1798 Location: Chicago-ish

Let me know how this goes. There are shops out there that do this since I have researched this a bit over a half a year ago

Recently I was building a turbo motor where I was going to offset bush the rods so my piston CH (Compression Height) distance could be adjusted. Opened up piston choices for me. I know think my rods might be better suited for a NA build and not heavy boost shock. Will likely move back to Crower's

I can't recall the valve clearance with the flat tops but you may have room to play around with offset bushings as well.
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1980 931 since 1989
1981 Ideola 931 Club Sport
1982 931 Entwicklungsfahrzeug
1979 924 NA ohne 650 mit 471
1982 931 Red Resurrection - 951 IC
1982 931 parts car / resurrection?
1980 924 NA (R&D lightweight)
1982 931 wana-be GTR race car

Euro924S2 · Joined: 06 Mar 2008 Posts: 215 Location: UK

Would be good to know if a place to buy bushings. I’ve asked my engine machine shop to make them for my 16v build when I dropped off the block, crank, rods and pistons yesterday. I didn’t tell them they were only 1mm wall thickness but they said, yeah, we make small end bushes from time to time, no problem! Hopefully they don’t retract on that statement!!
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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

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

I ordered 22mm bushings from Peter Nowen Motorsport 5 years ago: https://www.facebook.com/NowenMotorsport/

They were parts made for Saab OD 27,05mm ID 22,00mm and width 25,5mm
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Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Euro924S2 · Joined: 06 Mar 2008 Posts: 215 Location: UK

Plenty of VW type 4 piston small end bushings listed on google which are 24mm OD and 22.4mm ID. These bushings are designed to be pressed in to the rod, then reamed to final size once fitted so could be reamed to 22mm for the flat top pistons I imagine. Then have the oil hole drilled?

Example seller:

https://www.coolairvw.co.uk/product/021105431aks/
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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

MikeJinCO · Posted: Thu Sep 09, 2021 3:55 am Post subject:

Just received 22mm reducing bushings from EBS Racing, were in stock and $10 ea. 27mm OD, 22 Id undersized sized for ream to size. My motor machinist did not want to go about ordering pistons without the bushings in hand.
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Mike

'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)

Euro924S2 · Joined: 06 Mar 2008 Posts: 215 Location: UK

Good info! 27mm? I thought 924 were 24mm - apologies if ive got that wrong, makes my post above completely irrelevant!

My block and pistons are with the machinist now and should be ready in 2 weeks - he’s machining some bushes for me though, but I doubt he’ll churn them out for £10, let alone 10USD! I’d pay 3x that in shipping and tax though!
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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

Mike9311 · Joined: 14 Dec 2004 Posts: 1798 Location: Chicago-ish

Euro924S2 · Joined: 06 Mar 2008 Posts: 215 Location: UK

Ah, yes, my bad! Makes much more sense to install one new thicker bushing, than insert a bush within a bush!

Got me wondering now what my shop is planning/doing!
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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